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

作     者：Yihe Li Madhusoodhan Satish-Kumar Sasidharan Kiran Chuanhui Wan Jianping Zheng Yihe Li;Madhusoodhan Satish-Kumar;Sasidharan Kiran;Chuanhui Wan;Jianping Zheng

作者机构：Institute of Geophysics and GeomaticsHubei Subsurface Multi-scale Imaging Key LaboratoryChina University of GeosciencesWuhan 430074China Department of GeologyFaculty of ScienceNiigata UniversityNiigata 950-2181Japan Graduate School of Science and TechnologyNiigata UniversityNiigata 950-2181Japan Eighth Geological Brigade of HubeiXiangyang 441000China School of Earth SciencesState Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesWuhan 430074China 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2022年第13卷第4期

页      面：181-192页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：financial support from National Natural Science Foundation of China(41802200) Natural Science Foundation of Hubei Province(2020CFB863) China Scholarship Council(201906415017) China University of Geosciences Wuhan(CUGQY1938) the partial support through JSPS KAKENHI Grant Numbers JP15H05831 and 20KK0081 a PhD scholarship support from Niigata University financial support from National Natural Science Foundation of China(41520104003) China University of Geosciences Wuhan(CUGCJ1709) 

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

摘      要：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