Salinity variations of the inner Yangtze Sea during the Ordovician-Silurian transition and its influences on marginal marine euxinia
文献类型：期刊论文
| 作者 | Cao, Guangyao1,7,8; Liu, Yu1,2,7,8; Li, Chao1,7,8; Peng, Ping'an3; Hou, Mingcai2,7,8; Lash, Gary G.6; Zhou, Xiaolin4,5; Li, Yuanchun1,7,8; Song, Ying1,7,8 |
| 刊名 | GLOBAL AND PLANETARY CHANGE
 |
| 出版日期 | 2023-06-01 |
| 卷号 | 225页码:13 |
| 关键词 | Ordovician -Silurian transition Trace elements Redox Climate Watermass dynamics |
| ISSN号 | 0921-8181 |
| DOI | 10.1016/j.gloplacha.2023.104129 |
| 英文摘要 | The Ordovician-Silurian transition (OST) is a critical geological interval, during which dramatic climatic, environmental and biological changes occurred. Although expanded euxinic conditions have been regarded as one of the main causes of Late Ordovician mass extinction (LOME), the controls of euxinia remain the topic of debate. In this study, we evaluate the paleosalinity conditions of the inner Yangtze Sea (IYS) during the OST using a combination of paleosalinity proxies (B/Ga, Sr/Ba, and S/TOC). Our results reveal the climate-driven salinity variations during the OST, with lower salinity conditions in glacial interval derived from increasing fresh-water contribution in the IYS. In combination with available redox data, these salinity perturbations can be further related to the development of euxinia in the OST IYS. The existence of the pre-Hirnantian density stratified water columns limited diffusion of weathering-produced sulfate into deep water thereby favoring the formation of a mid-depth "euxinic wedge" redox structure in the IYS. In contrast, the desalinization of the IYS in glacial interval weakened the density stratification and facilitated the transportation of weathering-produced sulfate into deeper water. The associated strengthening and expansion of euxinic conditions during the Katian/Hirnantian transition may have triggered the first phase of the LOME. However, the relatively oxic conditions and vigorous hydrological circulations in glacial maximum may promoted the sulfate accumulation and distribution in the IYS. In post-glaciation, the invasion of open ocean seawater into the low-salinity inner Yangtze Sea not only rebuilt the halocline but enlarged the sulfate reservoir in the IYS, triggering the expansion of euxinic conditions in the anoxic basin. Our findings suggest that establishment of euxinic conditions in the IYS during OST was influenced by variations of seawater salinity and that these events may have exerted strong control on evolutionary patterns during this critical period in Earth history. |
| WOS研究方向 | Physical Geography ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000998587900001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/74282]  |
| 专题 | 有机地球化学国家重点实验室 |
| 通讯作者 | Liu, Yu |
| 作者单位 | 1.Chengdu Univ Technol, Int Ctr Sedimentary Geochem & Biogeochem Res, Chengdu 610059, Peoples R China 2.Chengdu Univ Technol, Key Lab Deep Time Geog & Environm Reconstruct & Ap, Minist Nat Resources, Chengdu 610059, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China 4.MNR, China Geol Survey, Chengdu Ctr Geol Survey, Chengdu 610081, Peoples R China 5.MNR, Key Lab Sedimentary Basin & Oil & Gas Resources, Chengdu 610081, Peoples R China 6.SUNY Coll Fredonia, Dept Geol & Environm Sci, Fredonia, NY 14063 USA 7.Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploitat, Chengdu 610059, Peoples R China 8.Chengdu Univ Technol, Inst Sedimentary Geol, Chengdu 610059, Peoples R China |
| 推荐引用方式 GB/T 7714 | Cao, Guangyao,Liu, Yu,Li, Chao,et al. Salinity variations of the inner Yangtze Sea during the Ordovician-Silurian transition and its influences on marginal marine euxinia[J]. GLOBAL AND PLANETARY CHANGE,2023,225:13. |
| APA | Cao, Guangyao.,Liu, Yu.,Li, Chao.,Peng, Ping'an.,Hou, Mingcai.,...&Song, Ying.(2023).Salinity variations of the inner Yangtze Sea during the Ordovician-Silurian transition and its influences on marginal marine euxinia.GLOBAL AND PLANETARY CHANGE,225,13. |
| MLA | Cao, Guangyao,et al."Salinity variations of the inner Yangtze Sea during the Ordovician-Silurian transition and its influences on marginal marine euxinia".GLOBAL AND PLANETARY CHANGE 225(2023):13. |
入库方式： OAI收割
来源：广州地球化学研究所
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