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	Constraints on the continental weathering intensity through the Permian using lithium isotopes of well-preserved brachiopod shells
通讯作者	Zhang, Feifei([email protected])
	Wang, Wen-qian1,2; Zhang, Feifei1,2; Liu, Chun-Yao3; von Strandmann, Philip A. E. Pogge4; Xiong, Guolin1; Zheng, Quanfeng5,6; Garbelli, Claudio7; Zhang, Yichun5,6; Yuan, Dongxun8; Shen, Shu-zhong1,2
	2024-12-15
发表期刊	EARTH AND PLANETARY SCIENCE LETTERS
ISSN	0012-821X
卷号	648页码:15
摘要	Lithium isotopic compositions (S7Li) in marine carbonates provide a powerful means to track continental weathering intensity through geological history and promote our understanding of how and why Earth remained habitable. However, S7Li values in ancient carbonates can be affected by factors such as primary carbonate mineralogy (e.g., aragonite, high-Mg calcite, low-Mg calcite) and post-depositional diagenesis, which may alter their primary signals. Modern articulate brachiopod shells have shown a constant S7Li offset compared to contemporary seawater, suggesting that fossil brachiopod shells could serve as robust archives for this geochemical proxy due to their diagenetically resistant low-Mg calcite composition. Despite this potential, few studies have explored this topic. In this study, we analyze and compare the geochemical compositions of fossil brachiopod shells and their enclosing carbonate rocks from Permian strata in South China to investigate whether brachiopod shells can reliably preserve the S7Li values of ancient seawater and, if they do, to obtain new constraints on changes in the continental weathering regimes through the Permian. We used several diagenetic screening methods, including scanning electron microscopy, cathodoluminescence microscopy, and elemental concentrations to detect potential diagenetic alteration. Our results indicate that 32 out of 49 shells preserve primary S7Li values. Notably, we observed that S7Li offsets between brachiopod shells and their enclosing carbonate rocks vary across the studied sections, likely due to diagenetic alteration of the bulk carbonates. Using the S7Li values from well-preserved brachiopod shells, we reconstructed S7Li variations of Permian seawater. We identified three distinct intervals: (1) extremely low S7Lisw values (as low as 6.7 +/- 2.9%o, n = 12, 1sd) during the Asselian and Sakmarian stages, (2) high S7Lisw values (32.6 +/- 4.5%o, n = 3, 1sd) similar to modern seawater during the Kungurian stage, and (3) relatively low S7Lisw values (13.6 +/- 3.9%o, n = 14, 1sd) from the Capitanian to the Changhsingian stages. These significant changes in S7Li values of Permian seawater indicate dramatic changes in continental weathering regimes during the Permian, possibly linked to major climate changes, such as the termination of the Late Paleozoic Ice Age and warming associated with the emplacement of the large igneous provinces.
关键词	Brachiopod shells Lithium isotopes Continental weathering Permian Carbonate diagenesis
DOI	10.1016/j.epsl.2024.119101
收录类别	SCI
语种	英语
关键词[WOS]	PALEOZOIC ICE-AGE ; LOW-MG CALCITE ; SEAWATER ; CARBONATE ; RECORD ; GEOCHEMISTRY ; STRATIGRAPHY ; DEGLACIATION ; DIAGENESIS ; TIMESCALE
资助项目	Natural Science Foundation of China[42322304] ; Natural Science Foundation of China[42103002] ; Natural Science Foundation of China[42293280] ; Natural Science Foundation of China[42073002] ; Natural Science Foundation of China[42472024] ; Natural Science Foundation of China[42261144668] ; Natural Science Foundation of China[41830323] ; Fundamental Research Funds for the Central Universities ; Frontiers Science Center for Critical Earth Material Cycling Fund ; ERC[682760]
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001351541700001
项目资助者	Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Frontiers Science Center for Critical Earth Material Cycling Fund ; ERC
出版者	ELSEVIER
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/44539
专题	中国科学院南京地质古生物研究所
通讯作者	Zhang, Feifei
作者单位	1.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, 163 Xianlin Ave, Nanjing 210023, Peoples R China 2.Nanjing Univ, Frontiers Sci Ctr Crit Earth Mat Cycling, 163 Xianlin Ave, Nanjing 210023, Peoples R China 3.Minist Nat Resources, Inst Oceanog 3, Xiamen 361005, Peoples R China 4.Johannes Gutenberg Univ Mainz, Inst Geosci, D-55122 Mainz, Germany 5.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Key Lab Palaeobiol & Petr Stratig, 39 East Beijing Rd, Nanjing 210008, Peoples R China 6.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironment, 39 East Beijing Rd, Nanjing 210008, Peoples R China 7.Sapienza Univ Rome, Dept Earth Sci, Piazzale Aldo Moro 5, I-00185 Rome, Italy 8.China Univ Min & Technol, Sch Resources & Geosci, 1 Daxue Rd, Xuzhou 221116, Peoples R China
推荐引用方式 GB/T 7714	Wang, Wen-qian,Zhang, Feifei,Liu, Chun-Yao,et al. Constraints on the continental weathering intensity through the Permian using lithium isotopes of well-preserved brachiopod shells[J]. EARTH AND PLANETARY SCIENCE LETTERS,2024,648:15.
APA	Wang, Wen-qian.,Zhang, Feifei.,Liu, Chun-Yao.,von Strandmann, Philip A. E. Pogge.,Xiong, Guolin.,...&Shen, Shu-zhong.(2024).Constraints on the continental weathering intensity through the Permian using lithium isotopes of well-preserved brachiopod shells.EARTH AND PLANETARY SCIENCE LETTERS,648,15.
MLA	Wang, Wen-qian,et al."Constraints on the continental weathering intensity through the Permian using lithium isotopes of well-preserved brachiopod shells".EARTH AND PLANETARY SCIENCE LETTERS 648(2024):15.

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