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  • Published: 19 May 2021

The kaolinite shuttle links the Great Oxidation and Lomagundi events

  • Weiduo Hao   ORCID: orcid.org/0000-0002-0486-424X 1 ,
  • Kaarel Mänd   ORCID: orcid.org/0000-0003-1575-3710 1 , 2 ,
  • Yuhao Li 1 ,
  • Daniel S. Alessi   ORCID: orcid.org/0000-0002-8360-8251 1 ,
  • Peeter Somelar 2 ,
  • Mathieu Moussavou 3 ,
  • Alexander E. Romashkin 4 ,
  • Aivo Lepland 2 , 5 , 6 ,
  • Kalle Kirsimäe 2 ,
  • Noah J. Planavsky   ORCID: orcid.org/0000-0001-5849-8508 7 &
  • Kurt O. Konhauser 1  

Nature Communications volume  12 , Article number:  2944 ( 2021 ) Cite this article

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  • Element cycles
  • Geochemistry

The ~2.22–2.06 Ga Lomagundi Event was the longest positive carbon isotope excursion in Earth’s history and is commonly interpreted to reflect perturbations in continental weathering and the phosphorous cycle. Previous models have focused on mechanisms of increasing phosphorous solubilization during weathering without focusing on transport to the oceans and its dispersion in seawater. Building from new experimental results, here we report kaolinite readily absorbs phosphorous under acidic freshwater conditions, but quantitatively releases phosphorous under seawater conditions where it becomes bioavailable to phytoplankton. The strong likelihood of high weathering intensities and associated high kaolinite content in post-Great-Oxidation-Event paleosols suggests there would have been enhanced phosphorus shuttling from the continents into marine environments. A kaolinite phosphorous shuttle introduces the potential for nonlinearity in the fluxes of phosphorous to the oceans with increases in chemical weathering intensity.

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Introduction.

The LE is the most pronounced and long-lived positive carbon isotope excursion in Earth history. Marine carbonate rocks deposited during the LE, which lasted at least 160 million years, are characterized by δ 13 C carb values >10 (refs. 1 , 2 , 3 , 4 ). The most widely accepted explanation for the LE relies on significant perturbation in the balance of different C burial fluxes—since organic carbon (C org ) is depleted in 13 C, an increase in C org burial compared to carbonate burial will result in 13 C-enrichment of the dissolved marine carbonate pool 2 . Although it is likely that at least some of the carbonate δ 13 C values reflect local, instead of global, processes (e.g., ref.  5 ), current explanations for the anomalously positive values require high rates of marine primary productivity. There is increasing consensus that P is likely to have been the ultimate limiting nutrient through Earth’s history 6 , 7 . Accordingly, explanations for the LE must center around the factors which can induce >100 myr perturbations to the global P cycle.

Oxidation of a reduced mineral enriched upper continental crust during the LE provides one possible mechanism to drive extended changes in the phosphorous cycle 8 , 9 . The proliferation of aerobic chemolithoautotrophy would have facilitated the rapid biological weathering of crustal sulfide minerals, leading to an extended episode of acid rock drainage, and solubilization of nutrient-bearing minerals 10 (e.g., apatite in rocks and soils, the weathering of which is highly pH-dependent 11 ). Similarly, extensive oxidation of siderite in aerially exposed sediments (e.g., shales, marls) during the LE would have led to high acid fluxes into soils and potentially promoted high atmospheric CO 2 levels, increasing weathering regimes more broadly 9 . Elevated siderite and pyrite contents in the weatherable shell during the LE were simply a consequence of higher fluxes of reduced S and Fe to marine sediments during the Archean (e.g., refs. 12 , 13 , 14 ). Upon weathering, P appears to have been mostly leached away and carried into the oceans, instead of retained in the paleosol (for instance, Hao et al. 15 report a peak in paleosol P loss at ~2.3–2.4 Ga). Kinetic and thermodynamic models further indicate that the weathering flux of P increased through the Archean, possibly reaching modern levels by the end of the eon 15 .

This driver of the LE assumes that higher acid fluxes will lead to greater P fluxes to the biosphere 8 , 10 . However, in the modern, typically <10% of total P is transported via rivers as dissolved anions (for detailed discussion see supplementary note 1). Most is transported in the particulate phase 16 , including P adsorbed onto Fe(III)-Al(III)-oxyhydroxides or clay minerals, or organically complexed 17 (see Table  S1 ). A large portion of adsorbed P is then sedimented in estuaries and marginal marine environments with the flocculation of particulate phases where they remain inaccessible to plankton until remobilization within the sediment pile 18 . In the absence of plants, the only organic compounds delivered to the oceans would have been from degraded continental microbial mats 19 , which are unlikely to have had as large of an effect on the P cycle. Further, during the LE, ferric oxyhydroxides may have been solubilized in the generally sulfide and siderite-rich Paleoproterozoic soils, in a process similar to what is observed in some pyrite-rich black shale weathering environments today 20 . Building from this framework, it seems reasonable that clay minerals were an important vector by which P was delivered to the oceans at that time.

Different terrestrial weathering regimes will lead to the formation of widely varying secondary mineral assemblages—potentially leading to major changes in P sorption and transport to the oceans. In highly weathered soils today, kaolinite [Al 2 Si 2 O 5 (OH) 4 )], and its hydrated form halloysite [Al 2 Si 2 O 5 (OH) 4 ·2H 2 O], are often the only remaining clay mineral phases aside from Fe(III)- and Al(III)-oxyhydroxides and quartz 21 . With higher weathering intensities due to a stronger acid flux from pyrite and siderite oxidation, as well as higher CO 2 levels, kaolinite formation would have been widespread. This link is well developed in modern settings, with extensive kaolinite formation in soils developed on organic and pyrite-rich lithologies such as black shales 22 , 23 . Despite still constituting an important part of the clay fraction, clay minerals more characteristic of moderate terrestrial weathering conditions (e.g., smectites) are more rapidly dissolved in acidic environments 21 , 24 , 25 , 26 .

Conceptually, increased fluxes of kaolinite generation post-GOE are also expected due to an increase in continental area at 2.4 Ga 27 , 28 , 29 , and intensified continental weathering in the warm climate aftermath of Huronian global glaciation 30 , 31 , 32 . While goethite and hematite formation under an oxygenated atmosphere may have driven increased Al substitution into these phases at the expense of kaolinite formation 33 , 34 , we consider it unlikely to have substantially decreased kaolinite fluxes, as ferric hydroxide solubility increases dramatically with lower pH and Fe 3+ becomes the dominant pyrite oxidant in high acid production drainage environments 9 . Thus, in this work, we show the evidence of kaolinite generation in shales and paleosols post-GOE, and the capacity of kaolinite shuttling P from land to the oceans. The subsequent bacteria growth experiments demonstrate that the delivery of P by kaolinite leads to the augmentation of coastal primary productivity.

Kaolinite in post-GOE shales and paleosols

Consistent with the above view that an increase in kaolinite formation in the aftermath of the GOE, kaolinite is found in several LE successions. For example, the LST-12 drill core exposing the upper strata of the Francevillian Group in Gabon hosts organic-rich shales with sedimentary kaolinite alongside mixed-layer illite-smectite 35 (supplementary note  2 , and Figs.  S1 – S3 ). Despite the greenschist facies metamorphic overprint 36 , tentative traces of preserved kaolinite are also found in X-ray diffraction spectra in two shale intervals of drill core OPH, which intersects the Zaonega Formation in Russia (supplementary note  2 and Fig.  S1 ). There is also enhanced formation of kaolinite in paleosols formed around, and following, the GOE indicating intensive acidic continental weathering at that time 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 . However, it is important to note that it is not possible to estimate exactly how common kaolinite is from the rock record given that it is often transformed during burial metamorphism 47 . Nonetheless, clues about the extent of kaolinite formation and weathering intensity can be gleamed from the major elemental composition of paleosols. We examine Al-richness (compared to Ca, Na, Mg, and K) in a record of definitive, relatively well-preserved paleosols through the late Archean and early Proterozoic ( n  = 10; see supplementary note 3 and Supplementary Data  1 ), since kaolinite is the main Al-bearing phase in highly weathered soils. Some Archean paleosols, such as Mt. Roe 45 (Fig.  1a ), display strong Al enrichment, suggesting strong weathering and local kaolinite production either under a high-CO 2 atmosphere during long period of weathering 39 , or in the presence of transient oxygenated conditions 45 . Notably, we observe that Al-richness peaks in soils formed between 2.4 Ga and 2.0 Ga (GOE and LE), compared to paleosols older or younger than this time bracket (Fig.  1a, b ), suggesting that kaolinite was highly abundant in contemporary terrestrial weathering environments. This trend is not likely an artifact of the differing latitude at which these paleosols formed given that calculated paleolatitudes do not correspond to the above trend (Supplementary Data  2 ).

figure 1

Relative kaolinite contents are approximated by molar Al-richness, as compared to Ca, Na, Mg, and K (CNM = CaO* + Na 2 O + MgO*; A = Al 2 O 3 ; K* = K 2 O*; asterisks denote data corrected for non-silicate contribution and K-metasomatism; Methods). a Al-richness in individual paleosols. The Ville Marie paleosol is poorly dated and may have formed either prior to or after the Great Oxidation Event (GOE), while its profile is possibly truncated with only the saprolite part preserved. Boxes show the mean value (horizontal line) and 25%/75% quantiles (edges), whiskers show the full range. Superimposed dots denote individual samples. b Al-richness in paleosols within the pre-GOE (>2.4 Ga), GOE and LJE (2.4–2.0 Ga), and post-LJE (>2.4 Ga) age bins.

The shuttling of P by kaolinite from rivers to the oceans

We used static and dynamic adsorption experiments to demonstrate that kaolinite will more effectively shuttle P to the oceans than other typical clay minerals or oxides/hydroxides. In the static experiments we simulated freshwater (pH 4 and ionic strength 0.01 M) to seawater-like (pH 8 and ionic strength 0.56 M) aqueous conditions, and also tested P adsorption to kaolinite at various initial phosphate concentrations to bracket modern riverine concentrations (Table  S1 ). We stress that these conditions are meant to be representative of fresh and marine waters – they are not based on empirical- or model-based reconstruction of past pH values. For all initial P concentrations <400 ppb (12.9 μM), the difference between the equilibrium adsorption experiments of simulated freshwater and seawater was negligible (Fig.  2 ). By contrast, at initial P concentrations >400 ppb, there was ~100–200 ppb (3.2–6.4 μM) more P adsorbed in the freshwater environment than seawater. Surprisingly, ionic strength variations were found to be insignificant in modulating P adsorption compared to pH (similar trendlines for IS = 0.01 M and 0.56 M at the pH 8 conditions; Fig.  2 ). However, the surface charge of kaolinite is pH-dependent 48 , 49 . Surface complexation modeling based on acid-base titrations of kaolinite shows that kaolinite surface functional groups are highly protonated at pH < 4.7, lending the clay a net positive charge (supplementary note 4), which can electrostatically attract negatively charged P species (dominantly H 2 PO 4 − at pH 2–7). A bidentate mononuclear surface complex of P onto positively charged sites is the dominant adsorption mechanism on kaolinite, explaining the pH-dependence of P adsorption (supplementary note 4).

figure 2

Black squares and continuous line represent P adsorption at pH 8, IS = 0.56 M conditions; green downward-facing triangles and dotted line represent P adsorption at pH 8, IS = 0.01 M conditions; purple upward-facing triangles and dashed-dotted line show P adsorption at pH 6, IS = 0.01 M conditions; blue circles and dashed line are P adsorption at pH 4, IS = 0.01 M conditions. Error bars represent the ±1 standard deviation of replicates.

To compare the results to clays more typical of moderate weathering regimes, we also examined the P adsorption capacities of illite and montmorillonite in both freshwater and marine conditions (data shown in supplementary note 5). We show that even under lower degrees of weathering characterized by montmorillonite and illite production, the transport of clays from rivers to the oceans can act as a P source simply due to variations in aqueous conditions. Importantly, however, the magnitude of P release is depressed when compared to kaolinite, suggesting that the kaolinite shuttle is more conducive to transporting P from land to the sea.

Dynamic adsorption experiments were performed to directly observe P behavior on kaolinite surfaces under simultaneously changing pH and ionic strength conditions (Fig.  3 ). At a P concentration of ~155 ppb (5 μM), 95% of the P was adsorbed onto kaolinite surfaces at shale weathering conditions (pH 4). After switching to marine conditions (pH of 8), the proportion of adsorbed P steadily declined throughout our experimental period (3 days). In total, 20% of pre-adsorbed P was released into the aqueous environment. As a comparison, we also analyzed P sorption to Fe(III)-oxides and Al(III)-hydroxide, such as hematite (Fe 2 O 3 ) and gibbsite (Al[OH] 3 ), respectively, as both minerals represent stable mineral oxide phases under extreme weathering environments (e.g., laterites 23 , 50 ). For both hematite and gibbsite, we show 100% adsorption of P at freshwater conditions but negligible release at seawater pH and ionic strength (Fig.  3 ).

figure 3

Freshwater conditions were simulated at pH 4 and ionic strength = 0.01 M, while marine conditions refer to pH 8 and ionic strength = 0.56 M. The black circles and continuous line represent P desorption from kaolinite surfaces; blue squares and dotted line show the P desorption from Fe-oxide; green triangles and dashed line show P desorption from Al-hydroxide. Error bars represent the ±1 standard deviation of replicates.

Augmentation of nearshore primary bioproductivity

To confirm that the desorbed P in our experiments will be truly bioavailable, we also explored the impact of P bearing kaolinite input to the growth of the marine cyanobacterium Synechococcus sp. PCC 7002 in continuous culture; this species comprises a significant fraction of the modern marine phytoplankton 51 . Without clay input, cell density reached a plateau at the 2nd day and then decreased to 5 × 10 6 cells/mL (55% of initial density) at the 14th day, while with 1 g/L of P-bearing clay input, the cell number reached 8 × 10 6 cells/mL (97% of initial density) at the end of the growth period. A 2 g/L P-bearing kaolinite input led to a bacterial cell density of 1.2 × 10 7 (139% of initial density), more than twice that of the blank (Fig.  4 ). In summary, the high adsorption capacity of kaolinite under freshwater conditions and its low capacity under marine conditions results in enhanced P bioavailability and cyanobacterial productivity in post-GOE nearshore environments.

figure 4

The original culture was divided into three 150 mL sub-cultures after day 6. Black squares and straight line represent the control culture incubated in modified A + growth media with only 5 µM potassium phosphate. The green circles and dashed line show the growth of a culture with addition of 150 mg of P-bearing kaolinite after day 6. The blue triangles and dotted line represent the culture in which 300 mg of P-bearing kaolinite was added after day 6. Error bars represent the ±0.5 standard deviation of replicates.

It should still be noted that kaolinite shuttling would not have been the sole process providing bioavailable P to marine primary producers after the GOE. For example, although P release from Fe(III)- and Al(III)-hydroxides is not as efficient as from kaolinite, bound P can be released from sediments to the water column over longer periods during early diagenesis 52 . Additionally, since Paleoproterozoic oceans were likely redox-stratified, some ferric oxyhydroxides would have been reductively dissolved below the redoxcline, and the released P made bioavailable through upwelling 53 . Smectite (montmorillonite) and illite, though showing a relatively lower P shuttling capacity compared to kaolinite (supplementary note 5), may also have contributed to nutrient shuttling during the Lomagundi Event, as, again, suggested by the preservation of smectite-rich clay minerals in Francevillian black shales 35 , 54 and major elemental compositions close to average smectite composition in contemporary paleosols (Fig.  S3 ). It is also worth noting that any changes in terrestrial P inputs are going to be modulated by the marine P cycle. For instance, coupled P and Fe enrichment in the Francevillian basin, which was likely influenced by upwelling (e.g., refs. 55 , 56 ), is likely a signal of Fe control on marine P cycling. Nonetheless, we highlight that the kaolinite shuttle added upon, and compounded, these prior P-fertilization mechanisms to significantly increase the supply of bioavailable P to nearshore ecosystems.

It is also possible that the kaolinite shuttle was turned on during other extreme global carbon cycle and biogeochemical perturbations in Earth’s past marked by anomalously high primary productivity (e.g., the Permian Triassic biotic crisis; Paleocene-Eocene Thermal Maximum (PETM)). For example, the PETM is characterized by a rise of surface temperature (5–8 °C) and extensive continental weathering (e.g., ref.  57 ). Consistent with our view, there are spikes in kaolinite formation during the PETM in several regions 58 , 59 . A compilation of marine sediments from the P-E boundary demonstrates a dramatic increase in kaolinite generation (approaching 80% of kaolinite in clay phases) during the PETM period (supplementary note 6, Supplementary Data  3 , and Fig.  S11 ). The shuttle of kaolinite from land to the oceans would have increased marine bio-productivity, induced the storage of CO 2 into 13 C-depleted organic carbon, and subsequently recover the post-PETM δ 13 C carb to Paleocene values (see ref.  57 ).

The kaolinite shuttle provides a novel mechanism to tie together known threads of Earth’s biogeochemical environment following the initial rise of atmospheric oxygen – increased acid weathering and enhanced primary productivity. A critical aspect of the model is that the response of the P cycle to weathering intensity is non-linear. Phosphorous fluxes became greatly enhanced when intense terrestrial weathering conditions that produced abundant kaolinite became spatially widespread. Strong nonlinearity in the extent of P shuttling could help explain why the Lomagundi stands out as a unique event in Earth’s history. Reconstructing mineralogical trends in deep time events and from Lomagundi-aged sediments is difficult given clay transformation with burial, but more recent “weathering events” (e.g., the PETM) bolster the case that there is a link between terrestrial weathering regimes, nutrient fluxes, intervals of anoxia, extinction, and ecosystem transitions.

The paleosol chemical database of eight relatively complete paleosols ranging in age from 2.76 Ga to 1.70 Ga was compiled from published paleosol studies and used to assess trends in weathering intensity through the time period. Al, Ca, Na, Mg, and K were plotted on a CNM-A-K ternary plot, modified from the CN-A-K plot of Nesbitt and Young 30 . The addition of M (Mg) was to separate Al-rich kaolinite/gibbsite – proxies for acid weathering – from Al and Mg-rich chlorite, which is a common diagenetic-metamorphic mineral. The paleosol database was scrubbed of samples representing cover rocks and soils developed on chemical sediments. Ca and Mg were corrected for carbonate and apatite content, and K for K-metasomatism. For the detailed methodology, see supplementary note 3. The mineral composition (Fig.  S1 ) of mudstones in drill core LST-12 (Francevillian Group, Gabon) and OPH (Zaonega Formation, Russia) was determined by X-ray diffractometry using a Bruker D8 Advance diffractometer with Cu K α radiation and a LynxEye positive sensitive detector. The measured patterns were interpreted and modeled using the Rietveld algorithm-based program Topaz. The relative error of quantification is better than 10% for major phases (>5 wt%) and better than 20% for minor phases (<5 wt%). For the geological setting, location and description of the successions see ref. 60 for core LST-12, and refs. 61 , 62 , 63 for the OPH core.

Phosphate equilibrium adsorption experiments onto three clay minerals (kaolinite, illite, and montmorillonite) were performed at the following phosphate concentrations: 1, 5, 10, 15, 20, 25, and 30 μM. A 5-mM Na 2 HPO 4 stock solution was prepared by dissolving Na 2 HPO 4 salt (ACS certified, Fisher Scientific) into MQ water. Solutions of different phosphate concentration were prepared by diluting the stock solution with a 0.01-M NaCl or 0.56-M NaCl solution to a total volume of 50 ml. Then, 5 ml of solution was pipetted to analyze the initial phosphate concentration. After that, 45 mg of clay was added into solution to make a 1-g/L solid suspension. After agitation, the solution pH of each experiment was adjusted to 4, 6, and 8 separately using 0.1 M HCl and 0.1 M NaOH. The solution pH was consistently maintained during the adsorption period. Once equilibrium was reached, 5 ml of clay suspension was pipetted and filtered through a 0.2-µm filter. The filtrate and the initial 5 ml solution were acidified for ICP-MS analysis. All experiments were performed in duplicate.

Phosphate dynamic adsorption experiments were performed in a 500-ml beaker. For simulation of freshwater conditions, 400 ml of 0.01 M NaCl solution was added to a glass beaker. Then, 0.4 mL of 5 mM Na 2 HPO 4 stock solution was added to make a 5-μM phosphate solution. A magnetic stir bar was added to keep the solution mixing during the whole experimental period. Once well mixed, a 5-ml aliquot was taken for initial phosphate concentration analysis. After, the solution pH was adjusted to 4 with small aliquots of 0.1 M HCl and 0.1 M NaOH, mimicking freshwater conditions, and 0.395 g of kaolinite was added into the beaker to make a 1 g/L clay suspension. The adsorption of phosphate onto clays under the freshwater condition lasted 24 h and during this process, the pH was maintained at 4 using 0.1 M HCl and 0.1 M NaOH solution. After 24 h, a 5-ml aliquot was syringed out and filtered through a 0.2 µm filter for ICP-MS analysis. Then, the solution pH was adjusted to 8 by a 0.1-M NaOH solution and 12.87 g of NaCl was added into the beaker at the same time to adjust the ionic strength to 0.56 M, representing marine water conditions. Once the pH stabilized, a 5-ml aliquot was collected for phosphate concentration analysis at t  = 0. The whole marine condition adsorption process took 2 days and the time intervals of sample collection were t  = 0, t  = 1 h, t  = 2 h, t  = 4 h, t  = 8 h, t  = 12 h, t  = 1 d, and t  = 2 d. During the experiment, the reaction beaker was covered by parafilm to prevent possible solution evaporation. Same procedure was applied to Al-hydroxide and Fe-oxide. The phosphate concentration in these samples was analyzed by ICP-MS. Detailed experimental information could also be found in Hai et al. 64 .

The cyanobacterium Synechococcus sp. PCC7002 was used as an analog strain in the growth experiment to analyze its response to the addition of P-bearing kaolinite clay. This axenic strain was incubated in a modified A + growth media with a limited phosphate concentration of 5 µM. All cultures were grown on a shaker in a designated growth chamber that was set at 30 °C with constant halogen lighting. A sterile 1-L Erlenmeyer flask with 550 mL of modified A+ growth media was initially inoculated from an axenic PCC 7002 culture growing on an agar plate. The growth of the microbial culture was monitored by optical density at 750 nm (OD 750 nm) on a daily basis after inoculation. The growth curve started at day 0 when the OD 750 nm absorbance was above 0.15. A triplicate of 1 mL cultures was extracted sterilely from the flask each day for Chlorophyll-a concentration analysis as an indicator of cell growth from day 0. When it was certain that the culture reached the stationary phase, at which time the Chlorophyll-a concentration stopped increasing at ~0.680 µg/mL, the culture was further divided into three 150 mL sub-cultures in 500 mL Erlenmeyer flasks. Immediately after sub-culturing, 150 mg and 300 mg of P-bearing kaolinite were added into two of the three sub-cultures to make a 1 g/L and 2 g/L kaolinite suspension, respectively. The last sub-culture was the control where no clay was added. All three cultures were continuously examined for cell growth by Chlorophyll-a concentration until day 14, when there was a clear cell density difference among three sub-cultures (Fig.  4 ). Both optical density at 750 nm and chlorophyll-a concentration was measured on a Beckman Coulter DU®520 UV/VIS spectrophotometer. The chlorophyll-a concentration was lastly converted to cell density using a correlation that was established from a standard growth curve, which was systematically quantified by both chlorophyll-a concentration and cell density that was measured on an Attune NXT acoustic focusing flow cytometer (Fig.  4 ).

Data availability

The authors declare that the main data supporting the findings of this study are available in the following Data Repository link: https://doi.org/10.17632/dmhfrympsr.1 .

Code availability

Code available at https://doi.org/10.5281/zenodo.4641971 .

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Acknowledgements

K.M. was supported by the Ministry of Education and Research of Estonia (Kristjan Jaak Scholarship program). K.M. and K.K. received further support from the Estonian Research Council grant PRG447 and P.S. from PUT1511. N.J.P acknowledges support from NASA Astrobiology Institute under Cooperative Agreement No. NNA15BB03A issued through the Science Mission Directorate. This work was supported by National Science and Engineering Research Council of Canada (NSERC) Discovery Grants to K.O.K. (RGPIN-165831) and D.S.A. (RGPIN-04134).

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Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Canada

Weiduo Hao, Kaarel Mänd, Yuhao Li, Daniel S. Alessi & Kurt O. Konhauser

Department of Geology, University of Tartu, Tartu, Estonia

Kaarel Mänd, Peeter Somelar, Aivo Lepland & Kalle Kirsimäe

Department of Geology, University of Science and Technology of Masuku, Franceville, Gabon

Mathieu Moussavou

Institute of Geology, Karelian Science Centre, Petrozavodsk, Russia

Alexander E. Romashkin

CAGE—Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT The Arctic University of Norway, Tromsø, Norway

Aivo Lepland

Geological Survey of Norway (NGU), Trondheim, Norway

The Department of Earth and Planetary Sciences, Yale University, New Haven, CT, USA

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Contributions

K.O.K. and W.H. conceived the study; W.H. performed all the P equilibrium adsorption experiments, pH edges, and dynamic adsorption experiments; W.H. and D.S.A. performed the surface complexation modeling of the adsorption data. W.H. compiled the database for P distribution in suspended sediments of modern river; K.M., P.S., M.M., A.E.R., A.L., and K.K. provided information for the Francevillian Group and the Zaonega Formation, and the database for paleosol. Y.L. conducted the bacteria growth curve experiments. W.H., K.M. K.O.K., and N.J.P. wrote the manuscript with input from all co-authors.

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Correspondence to Weiduo Hao .

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Hao, W., Mänd, K., Li, Y. et al. The kaolinite shuttle links the Great Oxidation and Lomagundi events. Nat Commun 12 , 2944 (2021). https://doi.org/10.1038/s41467-021-23304-8

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DOI : https://doi.org/10.1038/s41467-021-23304-8

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The Termination and Aftermath of the Lomagundi-Jatuli Carbon Isotope Excursions in the Paleoproterozoic Hutuo Group, North China

Doi:  10.1007/s12583-015-0654-4.

  • Zhenbing She 1, 2 ,  ,  , 
  • Fanyan Yang 3 , 
  • Wei Liu 4 , 
  • Luhua Xie 5, 6 , 
  • Yusheng Wan 7 , 
  • Chao Li 1 , 
  • Dominic Papineau 8, 9

State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China

School of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Ningxia Geology And Mineral Resources Centre Lab, Yinchuan 750021, China

Tianjin Research Institute for Water Transport Engineering, M. O. T., Tianjin 300456, China

State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

London Centre for Nanotechnology, University College London, London

Department of Earth Sciences, University College London, 17-19 Gower Street, London, United Kingdom

  • Corresponding author: Zhenbing She, [email protected]
  • Accepted Date: 17 Sep 2015
  • Publish Date: 01 Apr 2016
  • Paleoproterozoic , 
  • Lomagundi-Jatuli event , 
  • Hutuo Group , 
  • carbon isotope , 

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  • Figure 1. (a) Tectonic divisions of the North China Craton highlighting exposed Archean and Paleoproterozoic rocks (modified after Zhao et al., 1999 ). (b) Simplified geological map of the Wutai area (modified after Bai, 1986 ).
  • Figure 2. Generalized stratigraphic column of the Hutuo Group (modified after Bai, 1986 ) with correlation to Paleoproterozoic successions in N Henan (Lai et al., 2011) and E Liaoning provinces ( Tang et al., 2011 ). Previously published age dates and C isotope data are shown.
  • Figure 3. Sedimentary structures. (a) Herringbone cross-bedding, Wenshan Fm. (b) Ripple marks, Wenshan Fm. (c) Disturbed beds (black arrows), rounded intraclasts and flat pebbles (white arrows), Hebiancun Fm. (d) Convolute bedding, Qingshicun Fm. (e) Digitate stromatolite, Jianancun Fm. (f) Stromatolite bioherms, Jianancun Fm. (g) Stromatolite bioherms, Dashiling Fm. (h) Purple-colored wavy-Conical stromatolites, Wenshan Fm. (i) Oblique section of tightly-packed stromatolites, Daguandong Fm. (j) Cherty dolostone with alternating purplish chert layers (ch) and white dolomicrite layers (dol) indicating silicification during very early diagenetic stage, Hebiancun Fm. Hammers are ~40 cm long, and marker pen is 14 cm long.
  • Figure 4. Petrographic features of the Hutuo carbonates. (a) Slab of an orange-colored massive dolostone micro-drilled for C isotope analysis, arrow showing the drill pit; (b) pure microcrystalline dolostone with crystals generally smaller than 15 µm; (c) primary laminae in stromatolitic dolostone; (d) magnified view of (c) showing dolomite microcrystals and clots of carbonaceous material; (e) alternated dark organic-rich and transparent dolomite laminae in a stromatolite; (f) magnified view of (e) showing the dark organic-rich layers and clots. Note also the disseminated hematite (Hem) particles and local occurrence of quartz (Qtz).
  • Figure 5. Stratigraphic variation of δ 13 C, δ 18 O and Mn/Sr ratios of the Hutuo Group. Three stages of the δ 13 C curve (A, B and C) are shown in detail in Fig. 6 .
  • Figure 6. δ 13 C curves of the lower, middle and upper part of the Hutuo carbonates.
  • Figure 7. Cross-plots illustrating post-sedimentary alteration of the carbonates.

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Extending the record of the Lomagundi–Jatuli carbon isotope excursion in the Labrador Trough, Canada

Corresponding author: Malcolm Hodgskiss (email: [email protected] ).

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Malcolm S.W. Hodgskiss , Kelsey G. Lamothe , Galen P. Halverson , Erik A. Sperling; Extending the record of the Lomagundi–Jatuli carbon isotope excursion in the Labrador Trough, Canada. Canadian Journal of Earth Sciences 2020;; 57 (9): 1089–1102. doi: https://doi.org/10.1139/cjes-2019-0198

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The Labrador Trough in northern Québec and Labrador is a 900 km long Rhyacian–Orosirian orogenic belt containing mixed sedimentary–volcanic successions. Despite having been studied intensively since the 1940s, relatively few chemostratigraphic studies have been conducted. To improve our understanding of the Labrador Trough in the context of Earth history, and better constrain the local record of the Lomagundi–Jatuli carbon isotope excursion, high-resolution sampling and carbon isotope analyses of the Le Fer and Denault formations were conducted. Carbonate carbon isotopes (δ 13 C) in the Le Fer Formation record a large range in values from −4.4‰ to +6.9‰. This large range is likely attributable to a combination of post-depositional alteration and variable abundance of authigenic carbonate minerals; elemental ratios suggest that the most 13 C-enriched samples reflect the composition of the water column at the time of deposition. Cumulatively, these data suggest that the Lomagundi–Jatuli Excursion was ongoing during deposition of the Le Fer Formation, approximately 2 km higher in the stratigraphy than previously recognised. However, the possibility of a post-Lomagundi–Jatuli Excursion carbon isotope event cannot conclusively be ruled out. The directly overlying Denault Formation records a range in δ 13 C values, from −0.5‰ to +4.3‰, suggesting that it was deposited after the conclusion of the Lomagundi–Jatuli Excursion and that the contact between the Le Fer and Denault formations occurred sometime during the transition out of the Lomagundi–Jatuli Excursion, ca. 2106 to 2057 Ma.

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40 facts about elektrostal.

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Modified & Updated: 02 Mar 2024

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Elektrostal is a vibrant city located in the Moscow Oblast region of Russia. With a rich history, stunning architecture, and a thriving community, Elektrostal is a city that has much to offer. Whether you are a history buff, nature enthusiast, or simply curious about different cultures, Elektrostal is sure to captivate you.

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Known as the “Motor City of Russia.”

Elektrostal, a city located in the Moscow Oblast region of Russia, earned the nickname “Motor City” due to its significant involvement in the automotive industry.

Home to the Elektrostal Metallurgical Plant.

Elektrostal is renowned for its metallurgical plant, which has been producing high-quality steel and alloys since its establishment in 1916.

Boasts a rich industrial heritage.

Elektrostal has a long history of industrial development, contributing to the growth and progress of the region.

Founded in 1916.

The city of Elektrostal was founded in 1916 as a result of the construction of the Elektrostal Metallurgical Plant.

Located approximately 50 kilometers east of Moscow.

Elektrostal is situated in close proximity to the Russian capital, making it easily accessible for both residents and visitors.

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Elektrostal is home to several cultural institutions, including museums, theaters, and art galleries that showcase the city’s rich artistic heritage.

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Hosts the annual Elektrostal City Day celebrations.

Every year, Elektrostal organizes festive events and activities to celebrate its founding, bringing together residents and visitors in a spirit of unity and joy.

Has a population of approximately 160,000 people.

Elektrostal is home to a diverse and vibrant community of around 160,000 residents, contributing to its dynamic atmosphere.

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Home to notable architectural landmarks.

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Residents and visitors can enjoy various recreational activities, such as sports complexes, swimming pools, and fitness centers, enhancing the overall quality of life.

Provides a high standard of healthcare.

Elektrostal is equipped with modern medical facilities, ensuring residents have access to quality healthcare services.

Home to the Elektrostal History Museum.

The Elektrostal History Museum showcases the city’s fascinating past through exhibitions and displays.

A hub for sports enthusiasts.

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Celebrates diverse cultural festivals.

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Electric power played a significant role in its early development.

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Houses the Elektrostal Drama Theater.

The Elektrostal Drama Theater is a cultural centerpiece, attracting theater enthusiasts from far and wide.

Popular destination for winter sports.

Elektrostal’s proximity to ski resorts and winter sport facilities makes it a favorite destination for skiing, snowboarding, and other winter activities.

Promotes environmental sustainability.

Elektrostal prioritizes environmental protection and sustainability, implementing initiatives to reduce pollution and preserve natural resources.

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Elektrostal is known for its prestigious schools and universities, offering a wide range of academic programs to students.

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The city values its cultural heritage and takes active steps to preserve and promote traditional customs, crafts, and arts.

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Hosts annual cultural and artistic festivals.

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Provides a picturesque landscape for photography enthusiasts.

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Connects to Moscow via a direct train line.

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A city with a bright future.

Elektrostal continues to grow and develop, aiming to become a model city in terms of infrastructure, sustainability, and quality of life for its residents.

In conclusion, Elektrostal is a fascinating city with a rich history and a vibrant present. From its origins as a center of steel production to its modern-day status as a hub for education and industry, Elektrostal has plenty to offer both residents and visitors. With its beautiful parks, cultural attractions, and proximity to Moscow, there is no shortage of things to see and do in this dynamic city. Whether you’re interested in exploring its historical landmarks, enjoying outdoor activities, or immersing yourself in the local culture, Elektrostal has something for everyone. So, next time you find yourself in the Moscow region, don’t miss the opportunity to discover the hidden gems of Elektrostal.

Q: What is the population of Elektrostal?

A: As of the latest data, the population of Elektrostal is approximately XXXX.

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A: Elektrostal is located approximately XX kilometers away from Moscow.

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A: Yes, Elektrostal is home to several notable landmarks, including XXXX and XXXX.

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A: Elektrostal is known for its steel production industry and is also a center for engineering and manufacturing.

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A: Yes, Elektrostal is home to XXXX University and several other educational institutions.

Q: What are some popular outdoor activities in Elektrostal?

A: Elektrostal offers several outdoor activities, such as hiking, cycling, and picnicking in its beautiful parks.

Q: Is Elektrostal well-connected in terms of transportation?

A: Yes, Elektrostal has good transportation links, including trains and buses, making it easily accessible from nearby cities.

Q: Are there any annual events or festivals in Elektrostal?

A: Yes, Elektrostal hosts various events and festivals throughout the year, including XXXX and XXXX.

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Lomagundi Carbon Isotope Excursion

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  • First Online: 01 January 2015
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lomagundi jatuli excursion

  • Andrey Bekker 8  

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Lomagundi–Jatuli carbon isotope excursion ; Paleoproterozoic carbon isotope excursion

The Lomagundi carbon isotope excursion (LCIE), sensu stricto (s.s.), refers to highly positive carbon isotope values (on the average +8 ‰, but values as high as +16 ‰ are not uncommon with the highest values observed at +28 ‰) in Paleoproterozoic sedimentary carbonates deposited between ~2.22 and 2.06 Ga (Karhu and Holland 1996 ; Bekker et al. 2003 ), likely reflecting seawater composition. The beginning and the end of the excursion have not so far been recognized in the sedimentary record, and there is also uncertainty about the exact age of these transitions. Positive (at ~2.32 Ga and between ~2.45 and ~2.32 Ga; Bekker et al. 2001 ; Rasmussen et al. 2013 ) and negative (between ~2.45 and 2.32 Ga; Bekker et al. 2005 ) carbon isotope excursions have been found leading to the LCIE s.s. The older positive carbon isotope excursions, in particular the ~2.32 Ga one, are considered to be an...

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References and Further Reading

Baker AJ, Fallick AE (1989a) Evidence from the Lewisian limestone for isotopically heavy carbon in two-thousand-million-year-old sea water. Nature 337:352–354

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Bekker A, Holland HD (2012) Oxygen overshoot and recovery during the early Paleoproterozoic. Earth Planet Sci Lett 317–318:295–304

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Bekker A, Karhu JA, Kaufman AJ (2006) Carbon isotope record for the onset of the Lomagundi carbon isotope excursion in the Great Lakes area, North America. Precambrian Res 148:145–180

Bekker A, Kaufman AJ, Karhu JA, Eriksson KA (2005) Evidence for Paleoproterozoic cap carbonates in North America. Precambrian Res 137:167–206

Bekker A, Holland HD, Wang P-L, Rumble D III, Stein HJ, Hannah JL, Coetzee LL, Beukes NJ (2004) Dating the rise of atmospheric oxygen. Nature 427:117–120

Bekker A, Karhu JA, Eriksson KA, Kaufman AJ (2003) Chemostratigraphy of Paleoproterozoic carbonate successions of the Wyoming Craton: tectonic forcing of biogeochemical change? Precambrian Res 120:279–325

Bekker A, Kaufman AJ, Karhu JA, Beukes NJ, Swart QD, Coetzee LL, Eriksson KA (2001) Chemostratigraphy of the Paleoproterozoic Duitschland Formation, South Africa: implications for coupled climate change and carbon cycling. Am J Sci 301:261–285

Crne AE, Melezhik VA, Lepland A, Fallick AE, Prave AR, Brasier AT (2014) Petrography and geochemistry of carbonate rocks of the Paleoproterozoic Zaonega Formation, Russia: documentation of 13C-depleted non-primary calcite. Precambrian Res 240:79–93

Galimov EM, Kuznetsova NG, Prokhorov VS (1968) On the problem of the Earth’s ancient atmosphere composition in connection with results of isotope analysis of carbon from the Precambrian carbonates. Geochemistry 11:1376–1381 (in Russian)

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Karhu JA (1993) Paleoproterozoic evolution of the carbon isotope ratios of sedimentary carbonates in the Fennoscandian shield, Espoo. Geol Surv Finland Bull 371:87

Konhauser KO, Lalonde SV, Planavsky NJ, Pecoits E, Lyons TW, Mojzsis SJ, Rouxel OJ, Barley ME, Rosìere C, Fralick PW, Kump LR, Bekker A (2011) Aerobic pyrite oxidation and acid rock drainage during the great oxidation event. Nature 478:369–373

Kump LR, Junium C, Arthur MA, Brasier A, Fallick A, Melezhik V, Lepland A, Črne AE, Luo G (2011) Isotopic evidence for massive oxidation of organic matter following the great oxidation event. Science 334:1694–1696

Martin AP, Condon DJ, Prave AR, Melezhik VA, Lepland A, Fallick AE (2013) Dating the termination of the Palaeoproterozoic Lomagundi-Jatuli carbon isotope event in the North Transfennoscandian Greenstone Belt. Precambrian Res 224:160–168

Melezhik VA, Huhma H, Condon DJ, Fallick AE, Whitehouse MJ (2007) Temporal constraints on the Paleoproterozoic Lomagundi-Jatuli carbon isotope event. Geology 35:655–658

Partin CA, Bekker A, Planavsky NJ, Scott CT, Gill BG, Li C, Podkovyrov V, Maslov A, Konhauser KO, Lalonde SV, Love GD, Poulton SW, Lyons TW (2013) Large-scale fluctuations in Precambrian atmospheric and oceanic oxygen levels from the record of U in shales. EPSL 369–370:284–293

Pavlov AA, Hurtgen MT, Kasting JF, Arthur MA (2003) Methane-rich Proterozoic atmosphere? Geology 31:87–90

Planavsky NJ, Bekker A, Hofmann A, Owens J, Lyons TW (2012) Sulfur record of rising and falling marine oxygen and sulfate levels during the Lomagundi Event. PNAS 109(45):18300–18305

Rasmussen B, Bekker A, Fletcher IR (2013) Correlation of Paleoproterozoic glaciations based on U-Pb zircon ages for tuff beds in the Transvaal and Huronian Supergroups. EPSL 382:173–180

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Scott C, Wing BA, Bekker A, Planavsky NJ, Medvedev P, Bates SM, Yun M, Lyons TW (2014) Pyrite multiple-sulfur isotope evidence for rapid expansion and contraction of the early Paleoproterozoic seawater sulfate reservoir. Earth Planet Sci Lett 389:95–104

Sheldon ND (2013) Causes and consequences of low atmospheric pCO 2 in the Late Mesoproterozoic. Chem Geol 362:224–231

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Department of Earth Sciences, University of California, Riverside, 408 Geology Building, Riverside, CA, 92521, USA

Andrey Bekker

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Centro de Biología Molecular, Universidad Autónoma de Madrid, Madrid, Spain

Ricardo Amils

Labo. d'Astrophysique de Bordeaux (LAB), Observatoire Aquitain des Sciences de l'Univers (OASU), Floirac CX, France

Muriel Gargaud

Centro de Astrobiología (CAB), Inst. Nacional de Técnica Aeroespacial, Torrejón de Ardoz, Madrid, Spain

José Cernicharo Quintanilla

Geophysical Lab., Carnegie Institution of Washington, Washington, District of Columbia, USA

Henderson James Cleaves

Astronomy Department, University of Massachusetts, Amherst, Massachusetts, USA

William M. Irvine

Dépt. Sc. de la Terre et de l’Atmosphère, Université du Québec, Montréal, Montreal, Québec, Canada

Daniele Pinti

Centre National d'Etudes Spatiale (CNES) DPI/E2U, Paris CX, France

Michel Viso

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Bekker, A. (2014). Lomagundi Carbon Isotope Excursion. In: Amils, R., et al. Encyclopedia of Astrobiology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27833-4_5127-1

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DOI : https://doi.org/10.1007/978-3-642-27833-4_5127-1

Received : 24 July 2014

Accepted : 23 September 2014

Published : 30 April 2015

Publisher Name : Springer, Berlin, Heidelberg

Online ISBN : 978-3-642-27833-4

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DOI: https://doi.org/10.1007/978-3-642-27833-4_5127-2

DOI: https://doi.org/10.1007/978-3-642-27833-4_5127-1

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VIDEO

  1. (St George's 1XV Vs Lomagundi 1XV)

COMMENTS

  1. Deconstructing the Lomagundi-Jatuli Carbon Isotope Excursion

    The early to mid-Paleoproterozoic Lomagundi-Jatuli Excursion (LJE) is ostensibly the largest magnitude (approximately +5 to +30‰), longest duration (ca. 130-250 million years) positive carbon isotope excursion measured in carbonate rocks in Earth history. The LJE has been attributed to large nutrient fluxes, an increase in the size of the biosphere, a reorganization of the global carbon ...

  2. The grandest of them all: the Lomagundi-Jatuli Event and Earth's

    The Paleoproterozoic Lomagundi-Jatuli Event (LJE) is generally considered the largest, in both amplitude and duration, positive carbonate C-isotope (⁠ δ 13 C carb) excursion in Earth history.Conventional thinking is that it represents a global perturbation of the carbon cycle between 2.3-2.1 Ga linked directly with, and in part causing, the postulated rise in atmospheric oxygen during ...

  3. Palaeoproterozoic oxygenated oceans following the Lomagundi-Jatuli

    The approximately 2,220-2,060 million years old Lomagundi-Jatuli Event was the longest positive carbon isotope excursion in Earth history and is traditionally interpreted to reflect an ...

  4. The kaolinite shuttle links the Great Oxidation and Lomagundi events

    The ~2.22-2.06 Ga Lomagundi Event was the longest positive carbon isotope excursion in Earth's history and is commonly interpreted to reflect perturbations in continental weathering and the ...

  5. The termination and aftermath of the Lomagundi-Jatuli carbon isotope

    The Lomagundi-Jatuli Event (LJE) is one of the largest and earliest positive carbon isotope excursions preserving δ13Ccarb values between +5 and +16‰ in Paleoproterozoic carbonates worldwide. However, the duration, amplitude and patterns of these excursions remain poorly constrained. The 2.14-1.83 Ga Hutuo Group in the North China Craton is a >10 km thick volcano- sedimentary sequence ...

  6. High positive carbonate carbon isotope excursion identified in the

    Records of the Lomagundi-Jatuli Event (LJE) are well preserved globally, but high δ 13 C carb carbonates have not been identified in the North China Craton (NCC). Our results on ~3-4 km thick carbonates from the newly confirmed Palaeoproterozoic successions in Fanhe Basin in the northeastern NCC show that the ~2.20-2.06 Ga carbonates have positive carbon isotope excursion and those ...

  7. Extending the record of the Lomagundi-Jatuli carbon isotope excursion

    The directly overlying Denault Formation records a range in δ 13 C values, from −0.5‰ to +4.3‰, suggesting that it was deposited after the conclusion of the Lomagundi-Jatuli Excursion and that the contact between the Le Fer and Denault formations occurred sometime during the transition out of the Lomagundi-Jatuli Excursion, ca. 2106 ...

  8. A review of temporal constraints for the ...

    The Palaeoproterozoic Lomagundi-Jatuli Event is one of the largest magnitude and earliest known positive carbonate carbon isotope excursions, preserving δ 13 C values between + 5 and + 16‰ and even higher. It is recorded in sedimentary rocks on all continents bar Antarctica and spans stratigraphic thicknesses ranging from several to many tens of metres.

  9. Deconstructing the Lomagundi-Jatuli Carbon Isotope Excursion

    The Orosirian Period (2050-1800 Ma) of the Paleoproterozoic Era represents an interval between the Great Oxidation Event and Lomagundi-Jatuli Excursion, and the apparent environmental stability ...

  10. The grandest of them all: the Lomagundi-Jatuli Event and Earth's

    The Paleoproterozoic Lomagundi-Jatuli Event (LJE) is generally considered the largest, in both amplitude and duration, positive carbonate C-isotope (δ 13 C carb) excursion in Earth history.Conventional thinking is that it represents a global perturbation of the carbon cycle between 2.3-2.1 Ga linked directly with, and in part causing, the postulated rise in atmospheric oxygen during the ...

  11. Lomagundi Carbon Isotope Excursion

    The Lomagundi carbon isotope excursion (LCIE), sensu stricto (s.s.), refers to highly positive carbon isotope values (on the average +8 ‰, but values as high as +16 ‰ are not uncommon with the highest values observed at +28 ‰) in Paleoproterozoic sedimentary carbonates deposited between ∼2.22 and 2.06 Ga (Karhu and Holland 1996; Bekker et al. 2003), likely reflecting seawater composition.

  12. PDF The Termination and Aftermath of the Lomagundi -Jatuli Carbon Isotope

    The Termination and Aftermath of the Lomagundi-Jatuli Carbon Isotope Excursions 299 Figure 1. (a) Tectonic divisions of the North China Craton highlighting exposed Archean and Paleoproterozoic rocks (modified after Zhao et al., 1999). (b) Simplified geological map of the Wutai area (modified after Bai, 1986).

  13. The Termination and Aftermath of the Lomagundi-Jatuli Carbon Isotope

    The Lomagundi-Jatuli Event (LJE) is one of the largest and earliest positive carbon isotope excursions preserving δ 13 C carb values between +5 and +16‰ in Paleoproterozoic carbonates worldwide. However, the duration, amplitude and patterns of these excursions remain poorly constrained. The 2.14-1.83 Ga Hutuo Group in the North China Craton is a > 10 km thick volcano-sedimentary sequence ...

  14. Deconstructing the Lomagundi-Jatuli Carbon Isotope Excursion

    The early to mid-Paleoproterozoic Lomagundi-Jatuli Excursion (LJE) is ostensibly the largest magnitude (approximately +5 to +30‰), longest duration (ca. 130-250 million years) positive carbon isotope excursion measured in carbonate rocks in Earth history. The LJE has been attributed to large nutrient fluxes, an increase in the size of the ...

  15. Extending the record of the Lomagundi-Jatuli carbon isotope excursion

    The directly overlying Denault Formation records a range in δ 13 C values, from −0.5‰ to +4.3‰, suggesting that it was deposited after the conclusion of the Lomagundi-Jatuli Excursion and that the contact between the Le Fer and Denault formations occurred sometime during the transition out of the Lomagundi-Jatuli Excursion, ca. 2106 ...

  16. Response to the Lomagundi-Jatuli Event in the southwestern margin of

    The Lomagundi-Jatuli Event (LJE) refers to the significant positive carbon isotope excursion in seawater constituents that occurred immediately after the increase in atmospheric oxygen content during the Paleoproterozoic (2.22-2.06 Ga).

  17. Electrostal History and Art Museum

    Art MuseumsHistory Museums. Write a review. Full view. All photos (22) Suggest edits to improve what we show. Improve this listing. The area. Nikolaeva ul., d. 30A, Elektrostal 144003 Russia. Reach out directly.

  18. 40 Facts About Elektrostal

    40 Facts About Elektrostal. Elektrostal is a vibrant city located in the Moscow Oblast region of Russia. With a rich history, stunning architecture, and a thriving community, Elektrostal is a city that has much to offer. Whether you are a history buff, nature enthusiast, or simply curious about different cultures, Elektrostal is sure to ...

  19. Deconstructing the Lomagundi-Jatuli Carbon Isotope Excursion

    The early to mid-Paleoproterozoic Lomagundi-Jatuli Excursion (LJE) is ostensibly the largest magnitude (approximately +5 to +30‰), longest duration (ca. 130-250 million years) positive carbon isotope excursion measured in carbonate rocks in Earth history. The LJE has been attributed to large nutrient fluxes, an increase in the size of the biosphere, a reorganization of the global carbon ...

  20. Residents Outside Moscow Protest Power Outage, Demand Heating Amid

    Residents of a Moscow region town impacted by power outages have taken to the streets, demanding that local authorities restore heat to their homes as subzero temperatures grip the region, Russian ...

  21. Elektrostal, Moscow Oblast, Russia

    Elektrostal Geography. Geographic Information regarding City of Elektrostal. Elektrostal Geographical coordinates. Latitude: 55.8, Longitude: 38.45. 55° 48′ 0″ North, 38° 27′ 0″ East. Elektrostal Area. 4,951 hectares. 49.51 km² (19.12 sq mi) Elektrostal Altitude.

  22. Lomagundi Carbon Isotope Excursion

    The Lomagundi carbon isotope excursion (LCIE), sensu stricto (s.s.), refers to highly positive carbon isotope values (on the average +8‰, but values as high as +16‰ are not uncommon with the highest values observed at +28‰) in Paleoproterozoic sedimentary carbonates deposited between ~2.22 and 2.06 Ga (Karhu and Holland 1996; Bekker et al. 2003), likely reflecting open-marine seawater ...

  23. Lomagundi Carbon Isotope Excursion

    The Lomagundi carbon isotope excursion (LCIE), sensu stricto (s.s.), refers to highly positive carbon isotope values (on the average +8 ‰, but values as high as +16 ‰ are not uncommon with the highest values observed at +28 ‰) in Paleoproterozoic sedimentary carbonates deposited between ~2.22 and 2.06 Ga (Karhu and Holland 1996; Bekker et al. 2003), likely reflecting seawater composition.