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The origin of cap carbonate after the Ediacaran glaciations

文献类型：期刊论文

作者Wang, Ruimin1,2; Xing, Chaochao3,4; Wen, Bin5; Wang, Xubin1,2; Liu, Kunwei1,2; Huang, Tianzheng1,2; Zhou, Chuanming6,7; Shen, Bing1,2
刊名GLOBAL AND PLANETARY CHANGE
出版日期2023-07-01
卷号226页码:18
ISSN号0921-8181
关键词Hongtiegou Formation Chaidam Block Hankalchough Formation Tarim Block True polar wonder
DOI10.1016/j.gloplacha.2023.104141
通讯作者Xing, Chaochao(xingchaochao@cdut.edu.cn) ; Shen, Bing(bingshen@pku.edu.cn)
英文摘要Cap carbonate is the most unique component of a Snowball Earth glaciation, i.e., two Cryogenian global glaciations. In the canonical model, cap carbonate precipitation requires a deglacial extremely high atmospheric pCO(2) level, which is unique for a Snowball Earth glaciation but did not occur in other non-Snowball Earth glaciations. However, some Ediacaran glacial successions also have a carbonate unit directly overlying the glacial deposits, although the Ediacaran glaciation is widely accepted to be a non-Snowball Earth ice age. Therefore, occurrence of Ediacaran glacial cap carbonate is counterintuitive, challenging the traditional model of cap carbonate precipitation. Here, we investigate two Ediacaran glacial cap carbonates, i.e. the Zhoujieshan cap carbonate above the Hongtiegou glacial deposits in the Chaidam Block, and the Hankalchough cap carbonate overlying the Hankalchough glacial deposits in the Tarim Block. The Zhoujieshan cap carbonate shows a transitional contact with the underlying glacial deposits, and has a nearly invariant carbonate carbon isotope value (delta C-13(carb)) of similar to + 1 parts per thousand. The Hankalchough cap carbonate from the Luobupo section has a persistent delta C-13(carb) value of similar to -5 parts per thousand, but display a similar to 15 parts per thousand spatial isotopic gradient in the Quruqtagh area. Combining with other occurrences, the Ediacaran glacial cap carbonate differs from the Snowball Earth cap carbonate in paleogeographic distributions, sedimentary structures, and mineralogical and geochemical compositions. We noticed that the Ediacaran glacial cap carbonates were restricted at similar to 30-50 degrees N/S, which may reflect a rapid transition from glaciation to carbonate deposition in subtropics. Thus, we speculate that the Ediacaran glaciation might have extended to latitude low enough, while the subsequent deglaciation and global warming may associate with an expansion of carbonate precipitation toward higher latitudes. Thus, the Ediacaran glacial cap carbonate precipitation occurred when carbonate precipitation and glaciation spatially overlapped in subtropics. Alternatively, considering paleomagnetic evidence for a similar to 90 degrees reorientation of all continents due to the Ediacaran true polar wander (TPW) event, some Ediacaran glacial cap carbonates could also be driven by glaciated continents moving into lower latitudes, where glacier melt and carbonate precipitated. Either way, a typical Snowball Earth glaciation may lead to global cap carbonate depositions, while most of Phanerozoic glaciations are characterized by glacial deposits in mid- to high-latitude and carbonate precipitation in tropics, i.e., showing no spatial overlapping of glaciation and carbonate precipitation. Thus, the enigmatic cap carbonate precipitation after the Ediacaran glaciations imply a unique climatic condition that differs from either a Snowball Earth glaciation or a Phanerozoic ice age.
WOS关键词TRUE POLAR WANDER ; PALEOZOIC ICE-AGE ; METHANE SEEPS ; DOUSHANTUO FORMATION ; KIMBERLEY REGION ; ISOTOPE EVIDENCE ; SNOWBALL ; EVOLUTION ; OCEAN ; STRATIGRAPHY
资助项目National Natural Science Foundation of China[42225304] ; National Natural Science Foundation of China[42293291] ; Second Tibetan Plateau Scientific Expedition and Research[2019QZKK0706]
WOS研究方向Physical Geography ; Geology
语种英语
出版者ELSEVIER
WOS记录号WOS:001013155100001
资助机构National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research
源URL[http://ir.nigpas.ac.cn/handle/332004/42497]  
专题中国科学院南京地质古生物研究所
通讯作者Xing, Chaochao; Shen, Bing
作者单位1.Peking Univ, Key Lab Orogen Belts & Crustal Evolut, MOE, Beijing 100871, Peoples R China
2.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
3.Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploitat, Chengdu 610059, Peoples R China
4.Chengdu Univ Technol, Inst Sedimentary Geol, Chengdu 610059, Peoples R China
5.China Univ Geosci, Sch Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
6.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
7.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironment, Nanjing 210008, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Ruimin,Xing, Chaochao,Wen, Bin,et al. The origin of cap carbonate after the Ediacaran glaciations[J]. GLOBAL AND PLANETARY CHANGE,2023,226:18.
APA Wang, Ruimin.,Xing, Chaochao.,Wen, Bin.,Wang, Xubin.,Liu, Kunwei.,...&Shen, Bing.(2023).The origin of cap carbonate after the Ediacaran glaciations.GLOBAL AND PLANETARY CHANGE,226,18.
MLA Wang, Ruimin,et al."The origin of cap carbonate after the Ediacaran glaciations".GLOBAL AND PLANETARY CHANGE 226(2023):18.

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来源：南京地质古生物研究所

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