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Origin of K-bentonites in the Doushantuo cap dolostones from South China and its potential link with the sedimentary model of the Marinoan cap dolostones
Zhou, Mingzhong1,2; Wan, Bin(万斌)3; Zhou, Li1,2; Yang, Enlin1,2; Yang, Liansheng1,2; Luo, Taiyi4
2021-11-01
发表期刊PRECAMBRIAN RESEARCH
ISSN0301-9268
卷号366页码:17
摘要

A study of the K-bentonites in the Doushantuo cap dolostones on the Yangtze Platform in South China would facilitate understanding the origin of the Marinoan cap dolostones and testing the snowball Earth hypothesis. To date, sporadic work has been conducted on the whole-rock geochemistry of the K-bentonites from the platform and slope of the Yangtze Platform, to preliminarily understand the genesis of the K-bentonites. However, a study of the whole-rock geochemistry of the K-bentonites from the basin and on zircon geochemistry of the K-bentonites from the entire Yangtze Platform has not been carried out. Therefore, the nature of the primary magmas, source and tectonic setting of the source volcanoes, and the episodes of source volcanic eruptions of the K-bentonites are unknown, which hinders unraveling the possible link between the sedimentary model of the Marinoan cap dolostone and the K-bentonites. Here, we perform a systematic study of the whole-rock and zircon geochemistry of the K-bentonites. The major and trace element concentrations of the K-bentonites and trace element contents in their volcanic zircons suggest that the primary magmas of the K-bentonites from the Jiuqunao and Heyu sections are different in nature. The same geochemical results indicate that the source volcanoes of all the K-bentonites may occur in the extensional setting on the northern margin of the Yangtze Block. Hf isotopic compositions of the volcanic zircons in the K-bentonites imply that the source magmas of the K-bentonites are mainly mantle-derived, and may have mixed with the crustal materials from the northern margin of the Yangtze Block. Based on the difference in whole-rock and zircon geochemistry of the K-bentonites from Heyu and Jiuqunao, two episodes of the source volcanic eruptions of the K-bentonites could be identified. The K-bentonite at Heyu most probably represents the record of the old episode, while that at Jiuqunao represents the record of the young one. The here proposed dual episodic deposition of K-bentonites within the Doushantuo cap carbonates holds potential significance to constrain 1) the duration of the cap carbonate deposition and 2) their genesis in potential slushball or snowball Earth environments.

关键词Jiuqunao section Heyu section K-bentonite Marinoan cap dolostone Snowball Earth
DOI10.1016/j.precamres.2021.106416
收录类别SCI
语种英语
关键词[WOS]PB ZIRCON AGE ; VOLCANIC ASH BEDS ; IN-SITU ANALYSIS ; TRACE-ELEMENT ; HF ISOTOPES ; GEOCHEMICAL CHARACTERISTICS ; TRIASSIC BOUNDARY ; YANGTZE PLATFORM ; BASAL EDIACARAN ; LU-HF
资助项目first-class discipline group of geography of Guizhou Province[[2019]125] ; National Natural Science Foundation of China[41462001] ; National Natural Science Foundation of China[40963002] ; Project of National Key Research and Development Program of China[2016YFC0502601]
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000708833300002
项目资助者first-class discipline group of geography of Guizhou Province ; National Natural Science Foundation of China ; Project of National Key Research and Development Program of China
出版者ELSEVIER
文献类型期刊论文
条目标识符http://ir.nigpas.ac.cn/handle/332004/39955
专题中国科学院南京地质古生物研究所
通讯作者Zhou, Mingzhong; Luo, Taiyi
作者单位1.Guizhou Normal Univ, Sch Geog & Environm Sci, Guiyang 550001, Peoples R China
2.State Key Lab Incubat Base Karst Mt Ecol Environm, Guiyang 550001, Peoples R China
3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
4.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China
推荐引用方式
GB/T 7714
Zhou, Mingzhong,Wan, Bin,Zhou, Li,et al. Origin of K-bentonites in the Doushantuo cap dolostones from South China and its potential link with the sedimentary model of the Marinoan cap dolostones[J]. PRECAMBRIAN RESEARCH,2021,366:17.
APA Zhou, Mingzhong,Wan, Bin,Zhou, Li,Yang, Enlin,Yang, Liansheng,&Luo, Taiyi.(2021).Origin of K-bentonites in the Doushantuo cap dolostones from South China and its potential link with the sedimentary model of the Marinoan cap dolostones.PRECAMBRIAN RESEARCH,366,17.
MLA Zhou, Mingzhong,et al."Origin of K-bentonites in the Doushantuo cap dolostones from South China and its potential link with the sedimentary model of the Marinoan cap dolostones".PRECAMBRIAN RESEARCH 366(2021):17.
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