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Geochronological and geochemical constraints on the origin of highly C-13(carb)-depleted calcite in basal Ediacaran cap carbonate

文献类型：期刊论文

作者Lan, Zhongwu1,2,3; Wu, Shitou1; Roberts, Nick M. W.4; Zhang, Shujing5; Cao, Rong1,6; Wang, Hao1; Yang, Yueheng1
刊名GEOLOGICAL MAGAZINE
出版日期2022-04-04
页码12
ISSN号0016-7568
关键词cap carbonate South China calcite U-Pb geochronology calcite REE LA-ICP-MS
DOI10.1017/S001675682200019X
英文摘要Ediacaran cap dolostone atop Marinoan glacial deposits contains complex sedimentary structures with extremely negative delta C-13(carb) values in close association with oscillations in palaeoclimatic and oceanographic proxy records. However, the precise geological, geochronological and geochemical context of the cap dolostone is not clarified, which hampers us from correctly interpreting the extremely negative delta C-13(carb) values and their causal relationships with the Snowball Earth hypothesis. In this study, we conducted detailed in situ geochronological and geochemical analyses on the calcite within the cap dolostone from the Ediacaran Doushantuo Formation in South China in order to define its formation and relationship to the Snowball Earth hypothesis. Petrographic observations show that formation of dolomite pre-dates precipitation of calcite and pyrite, which pre-dates quartz cementation in the basal cap carbonate. Calcite cement within the cap dolostone yielded a U-Pb age of 636.5 +/- 7.4/17.8 Ma (2 sigma, MSWD = 1.6, n = 36/40), which is within uncertainty of a published dolomite U-Pb age of 632 +/- 17 Ma (recalculated as 629.3 +/- 16.7/22.9 Ma). These age constraints negate the possibility that the calcite cement was formed by late Ediacaran or Cambrian hydrothermal activity. The rare earth element distribution patterns suggest a dominant seawater origin overprinted by subsequent early Ediacaran hydrothermal activity. The combined age, petrographic and geochemical data suggest oxidization of methane clathrates in response to complicated interplay between eustasy and isostatic rebound and hydrothermal fluids.
WOS关键词U-PB GEOCHRONOLOGY ; SOUTH CHINA ; DOUSHANTUO FORMATION ; ICP-MS ; ISOTOPIC EVIDENCE ; METHANE SEEPS ; YANGTZE ; MARINE ; SEDIMENTARY ; CEMENTS
资助项目National Science Foundation of China[41673016] ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences[SKL-Z202001] ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences[193112] ; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences[GPMR201902]
WOS研究方向Geology
语种英语
出版者CAMBRIDGE UNIV PRESS
WOS记录号WOS:000781109900001
资助机构National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences ; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences ; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences ; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences ; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences ; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences ; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences ; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences ; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences ; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences ; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences ; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences ; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences ; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences ; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences ; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences ; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/105111]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Lan, Zhongwu
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Jiangsu, Peoples R China
3.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Hubei, Peoples R China
4.British Geol Survey, Geochronol & Tracers Facil, Keyworth NG12 5GG, Notts, England
5.Trinity Coll Dublin, Sch Nat Sci, Dept Geol, Dublin 2, Ireland
6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Lan, Zhongwu,Wu, Shitou,Roberts, Nick M. W.,et al. Geochronological and geochemical constraints on the origin of highly C-13(carb)-depleted calcite in basal Ediacaran cap carbonate[J]. GEOLOGICAL MAGAZINE,2022:12.
APA Lan, Zhongwu.,Wu, Shitou.,Roberts, Nick M. W..,Zhang, Shujing.,Cao, Rong.,...&Yang, Yueheng.(2022).Geochronological and geochemical constraints on the origin of highly C-13(carb)-depleted calcite in basal Ediacaran cap carbonate.GEOLOGICAL MAGAZINE,12.
MLA Lan, Zhongwu,et al."Geochronological and geochemical constraints on the origin of highly C-13(carb)-depleted calcite in basal Ediacaran cap carbonate".GEOLOGICAL MAGAZINE (2022):12.

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来源：地质与地球物理研究所

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