Lithium isotope and mercury evidence for enhanced continental weathering and intense volcanism during the Ordovician-Silurian transition
文献类型：期刊论文
| 作者 | Yang, Xiangrong4,5,6; Yan, Detian5; Wilson, David J.4; von Strandmann, Philip A. E. Pogge3,4; Liu, Xianyi4; Liu, Chunyao4; Tian, Hui2; Liu, Mu1; Zhang, Liwei5; Zhang, Bao5 |
| 刊名 | GEOCHIMICA ET COSMOCHIMICA ACTA
 |
| 出版日期 | 2025-02-15 |
| 卷号 | 391页码:49-68 |
| 关键词 | Continental weathering Lithium isotopes Mass extinctions Volcanism Glaciation |
| ISSN号 | 0016-7037 |
| DOI | 10.1016/j.gca.2024.12.010 |
| 英文摘要 | The Ordovician-Silurian transition (OST) was characterised by climatic fluctuations (warming in the Katian and glaciation in the Hirnantian) and mass extinctions. However, the mechanisms driving the climatic and biological variability remain under debate. In order to reveal the relationships between volcanism, climate, and continental weathering, we measured lithium (Li) isotopes and mercury (Hg) concentrations in a carbonate-dominated marine section from South China. The reconstructed S7Liseawater values were generally 21 %o during the Ordovician-Silurian transition, with negative excursions towards 16 %o in the latest Katian and the latest Hirnantian intervals. We infer that changes in continental weathering affected dissolved riverine Li fluxes and S7Li values, and thereby exerted a major control on the seawater S7Li variations, while changes in temperature that influenced isotope fractionation during weathering and reverse weathering exerted a secondary control. In the Late Katian, intense volcanic activity (high Hg/TOC ratios and low S13C values) likely initiated the climatic warming (late Boda warming), which was sustained by enhanced clay formation (S7Liseawater values of 21 %o). The intense volcanism also contributed to the high primary productivity and expansion of ocean anoxia, accounting for the Katian extinction. In the latest Katian and latest Hirnantian, enhanced and more congruent weathering (S7Liseawater values of 16 %o) likely contributed to the initiation of global cooling and further glaciation. Meanwhile, the weathering-induced expansion of euxinic seawater could have driven the Late Ordovician Mass Extinction (LOME) events. During the Hirnantian glacial intervals, decreased and incongruent weathering could have contributed to reduced CO2 drawdown, ultimately allowing warming and climatic recovery. Overall, the climatic fluctuations during the OST were related to changes in continental weathering, while the multiphase biotic extinctions could be attributed to volcanism and/or weathering-induced oceanic anoxia. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001419987200001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/82669]  |
| 专题 | 中国科学院广州地球化学研究所 |
| 通讯作者 | Yan, Detian |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 3.Johannes Gutenberg Univ Mainz, Inst Geosci, MIGHTY, D-55122 Mainz, Germany 4.Univ London, Univ Coll London & Birkbeck, Inst Earth & Planetary Sci, LOGIC, Gower St, London WC1E 6BT, England 5.China Univ Geosci, Key Lab Tecton & Petr Resources, Minist Educ, Wuhan 430074, Peoples R China 6.Yangtze Univ, Sch Geosci, Wuhan 430100, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Xiangrong,Yan, Detian,Wilson, David J.,et al. Lithium isotope and mercury evidence for enhanced continental weathering and intense volcanism during the Ordovician-Silurian transition[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2025,391:49-68. |
| APA | Yang, Xiangrong.,Yan, Detian.,Wilson, David J..,von Strandmann, Philip A. E. Pogge.,Liu, Xianyi.,...&Chen, Daizhao.(2025).Lithium isotope and mercury evidence for enhanced continental weathering and intense volcanism during the Ordovician-Silurian transition.GEOCHIMICA ET COSMOCHIMICA ACTA,391,49-68. |
| MLA | Yang, Xiangrong,et al."Lithium isotope and mercury evidence for enhanced continental weathering and intense volcanism during the Ordovician-Silurian transition".GEOCHIMICA ET COSMOCHIMICA ACTA 391(2025):49-68. |
入库方式： OAI收割
来源：广州地球化学研究所
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