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DOI	10.1016/j.epsl.2020.116704
	Mg isotope evidence for restriction events within the Paleotethys ocean around the Permian-Triassic transition
	Hu, Zhongya; Li, Weiqiang; Zhang, Hua; Krainer, Karl; Zheng, Quan-feng; Xia, Zhiguang; Hu, Wenxuan; Shen, Shu-zhong
通讯作者	Li, WQ (通讯作者)
发表日期	2021
ISSN	0012-821X
EISSN	1385-013X
卷号	556
英文摘要	The Permian-Triassic transition witnessed the largest mass extinction event in Earth's history, multiple mechanisms have been proposed to explain the cause of this catastrophe, however, relatively less attention has been paid to the paleogeography and major element chemistry of seawater and its possible link to mass extinction during this interval. Syndepositional massive marine dolostones could record the Mg isotope signature of contemporaneous seawater that hold clues of ancient Mg cycling. In this study, we investigated Mg isotopes of dolomite from three widely spaced carbonate sections in the Paleotethys to trace oceanic Mg cycling during this critical period. The latest Permian dolostones from all studied sections have similar delta Mg-26 values around -2.1 +/- 0.1 parts per thousand. However, a remarkable and consistent increase in delta Mg-26(dolomite) across the extinction interval occurred in both eastern and western margins of the Paleotethys. The results suggest that delta Mg-26 of seawater in Paleotethys fluctuated by 0.4 parts per thousand within similar to 750 kyr across the Permian-Triassic transition. Modeling reveals that the high rate of change in delta 26Mg(seawater)required an extremely short residence time for seawater Mg. This is attributed to dramatically intensified dolomitization in a restricted oceanic environment, with Mg isotope evidence revealing that the Paleotethys Ocean experienced transient restriction events, in association with radical changes in the major cation composition of seawater, around the end-Permian mass extinction event (EPME). (C) 2020 Elsevier B.V. All rights reserved.
关键词	DISORDERED DOLOMITE CARBON-CYCLE SOUTH CHINA FRACTIONATION DOLOMITIZATION CALCITE PRECIPITATION CHEMISTRY RECOVERY OUTLOOK
英文关键词	dolomite; Mg isotopes; Permian-Triassic transition; Paleotethys; restriction
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000605759500001
来源期刊	EARTH AND PLANETARY SCIENCE LETTERS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260323
推荐引用方式 GB/T 7714	Hu, Zhongya,Li, Weiqiang,Zhang, Hua,et al. Mg isotope evidence for restriction events within the Paleotethys ocean around the Permian-Triassic transition[J]. 中国科学院青藏高原研究所,2021,556.
APA	Hu, Zhongya.,Li, Weiqiang.,Zhang, Hua.,Krainer, Karl.,Zheng, Quan-feng.,...&Shen, Shu-zhong.(2021).Mg isotope evidence for restriction events within the Paleotethys ocean around the Permian-Triassic transition.EARTH AND PLANETARY SCIENCE LETTERS,556.
MLA	Hu, Zhongya,et al."Mg isotope evidence for restriction events within the Paleotethys ocean around the Permian-Triassic transition".EARTH AND PLANETARY SCIENCE LETTERS 556(2021).