Robust sulfur and oxygen isotope evidence for a highly anoxic paleoenvironment in Late Devonian seawater: Insights from marine anhydrites in the Zaige Formation, South China
文献类型：期刊论文
| 作者 | Shu, Xiaochao2,3; Meng, Fanwei1 ; Liang, Kun1
|
| 刊名 | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
 |
| 出版日期 | 2024-06-15 |
| 卷号 | 644页码:13 |
| 关键词 | Anhydrites Sulfur isotope anomaly Anoxic marine paleoenvironment Mass extinction Late Devonian |
| ISSN号 | 0031-0182 |
| DOI | 10.1016/j.palaeo.2024.112200 |
| 通讯作者 | Meng, Fanwei(fwmeng@isl.ac.cn) |
| 英文摘要 | A global -scale mass extinction event occurred in the Late Devonian, and its triggering mechanisms have remained a subject of controversy. The key to resolving this controversy lies in elucidating paleoenvironmental characteristics and their coupling relationship with the mass extinction. Marine evaporites serve as sensitive indicators that can be used for reconstructing the geochemical history of ancient oceans. In this study, we present a dual sulfur and oxygen isotopic dataset of marine anhydrites in the Lunatian gypsum deposit (Yunnan, China), and investigate its paleoenvironmental significance within the framework of the Late Devonian mass extinction. These anhydrites originate in arid and hot continental margin seas near convergent plate boundaries, forming as a result of the dehydration of marine gypsums during burial processes. Anhydrites exhibit a conspicuous positive anomaly in delta 34 S values (23.6 - 25.1%o, averaging 24.3%o), primarily attributed to bacteria -mediated sulfate reduction. The delta 18 O values of the Lunatian anhydrites (12.2 - 15.2%o, averaging 14.0%o) indicate a slightly higher oxygen isotope composition for Late Devonian seawater (8.7 - 11.7%o, averaging 10.5%o) compared to those of contemporary seawater (9.5 - 10.1%o). Such an oxygen isotopic characteristic for the Lunatian anhydrites is intricately associated with the chemical processes that occur during the diffusion of sulfides into the upper seawater. The anhydrite -forming evaporating system has a noticeable brine layering where the surface seawater is less dense than the deeper brine, and bacterial processes gradually increase delta 34 S in the deep brine. When the deep brine and surface seawater rapidly mix, it leads to a significant positive shift in the sulfur isotope composition of the resulting evaporites. Our sulfur and oxygen isotope data from Lunatian anhydrites validate the existence of an exceedingly anoxic marine environment during the Late Devonian, potentially serving as a pivotal factor in the mass extinction event. |
| WOS关键词 | MASS EXTINCTION ; SULFATE ; CONSTRAINTS ; BOUNDARY ; WATER ; STRATIGRAPHY ; EVOLUTION ; EVENTS ; ORIGIN ; GYPSUM |
| 资助项目 | Basic Frontier Scientific Research Program of the Chinese Academy of Sciences[ZDBS-LY- DQC021] ; National Key Research and Development Program of China[2023YFE0104000] ; National Natural Sciences Foundation of China[42302076] ; Open Fund from SinoProbe Laboratory[SL202409] ; China Postdoctoral Science Foundation[2022M723380] |
| WOS研究方向 | Physical Geography ; Geology ; Paleontology |
| 语种 | 英语 |
| WOS记录号 | WOS:001230989800001 |
| 出版者 | ELSEVIER |
| 资助机构 | Basic Frontier Scientific Research Program of the Chinese Academy of Sciences ; National Key Research and Development Program of China ; National Natural Sciences Foundation of China ; Open Fund from SinoProbe Laboratory ; China Postdoctoral Science Foundation |
| 源URL | [http://ir.nigpas.ac.cn/handle/332004/43783]  |
| 专题 | 中国科学院南京地质古生物研究所 |
| 通讯作者 | Meng, Fanwei |
| 作者单位 | 1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China 2.Chinese Acad Geol Sci, SinoProbe Lab, Beijing 100094, Peoples R China 3.China Univ Min & Technol, Sch Resources & Geosci, Xuzhou 221116, Peoples R China |
| 推荐引用方式 GB/T 7714 | Shu, Xiaochao,Meng, Fanwei,Liang, Kun. Robust sulfur and oxygen isotope evidence for a highly anoxic paleoenvironment in Late Devonian seawater: Insights from marine anhydrites in the Zaige Formation, South China[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2024,644:13. |
| APA | Shu, Xiaochao,Meng, Fanwei,&Liang, Kun.(2024).Robust sulfur and oxygen isotope evidence for a highly anoxic paleoenvironment in Late Devonian seawater: Insights from marine anhydrites in the Zaige Formation, South China.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,644,13. |
| MLA | Shu, Xiaochao,et al."Robust sulfur and oxygen isotope evidence for a highly anoxic paleoenvironment in Late Devonian seawater: Insights from marine anhydrites in the Zaige Formation, South China".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 644(2024):13. |
入库方式： OAI收割
来源：南京地质古生物研究所
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