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2.0 Ga orogenic graphite deposits and associated 13C-enriched meta-carbonate rocks from South China Craton:Implications for global Lomagundi event

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Geoscience Frontiers 2022年第4期13卷 181-192页

作者： Yihe Li madhusoodhan satish-kumar Sasidharan Kiran Chuanhui Wan Jianping Zheng Institute of Geophysics and Geomatics Hubei Subsurface Multi-scale Imaging Key LaboratoryChina University of GeosciencesWuhan 430074China Department of Geology Faculty of ScienceNiigata UniversityNiigata 950-2181Japan Graduate School of Science and Technology Niigata UniversityNiigata 950-2181Japan Eighth Geological Brigade of Hubei Xiangyang 441000China School of Earth Sciences State Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesWuhan 430074China

The Lomagundi(-Jatuli)event,characterized by extremely high positive global inorganic carbon isotope excursion at about 2.2 billion years ago,is pivotal in investigating the causes and consequences of great oxygenation event,inventory and sequestration of carbon on the Earth’s surface,evolution of life,and more profoundly tectonic control on Earth’s ***,the reasons that caused the isotopic excursion are not resolved ***,we report the discovery of meta-carbonate rocks with distinct positive carbon isotopic excursion from the Paleoproterozoic continental collision zone of the Kongling Complex,South China *** δ^(13)C_(V-PDB) values for meta-carbonate rocks show positive values in the range from+5.5‰to+11.6‰,whereas the δ^(13)C_(V-PDB) values of associated graphite deposits range from-25.8‰to-9.5‰.Zircon U-Pb-Hf isotopes from zircon-bearing meta-carbonate sample yielded weighted average _(207)Pb/_(206)Pb age of 2001.3±9.5 Ma,with correspondingε_(Hf)(t)range from-7.05 to-3.16,comparable to the values of local 2.9–2.6 Ga basement *** characteristics of meta-carbonate rocks,such as their rare earth element patterns and the trace element parameters of La,Ce,Eu,and Gd anomalies and Y/Ho ratio,suggest that the carbonate deposition took place in passive continental margin in association with large volumes of organic *** extensive graphite deposits from Kongling Complex in South China Craton,their equivalents in the North China Craton and elsewhere across the globe prove that the burial of ^(12)C-enriched organic carbon has eventually resulted in the global enrichment of ^(13)C in the atmospheric CO_(2),which is recorded in the marine carbonate *** mass balance estimates indicate that more than half of the organic carbon was buried during the oceanic ***,the observed global shift could be directly related to the continent collision event in greater China,thus resolving the long-standing paradox of the Lomag

关键词： Positive carbon isotope excursion Lomagundi(-Jatuli)event Kongling Complex South China Craton Marine carbonate

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