The Ediacaran palaeo-ocean environment in the northwest margin of South China Craton: Constraints of C-O-Mo isotopic and element geochemistry
文献类型：期刊论文
| 作者 | Dong, Bohao2,3; Dong, Yunpeng3; Long, Xiaoping3; Hua, Hong3; Li, Jie4 ; Zhao, Bingshuang3; Cheng, Chao1
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| 刊名 | EARTH-SCIENCE REVIEWS
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| 出版日期 | 2024-03-01 |
| 卷号 | 250页码:33 |
| 关键词 | C-O-Mo isotopes Palaeoproductivity Ediacaran palaeoenvironment Pulsed oxygenation events South China Craton |
| ISSN号 | 0012-8252 |
| DOI | 10.1016/j.earscirev.2024.104712 |
| 英文摘要 | The coevolution of the redox environment, productivity and Ediacaran fauna is crucial to understanding the trigger of Early Cambrian explosion of the Chengjiang Biota and Qingjiang Biota in the southwestern and northern margins of the South China Craton, respectively. Multiple element and isotope geochemical proxies are effective indicators for palaeo-ocean environment and productivity. In this study, our new combination of geochemical proxies of FeT/Al, Th/U, V/(V + Ni), V/Sc, Ceanom, Uanom, CrEF, Al/Ti, MoEF, (Al, P, Ba, Cu, Zn, Ni) xs, and 813C and 898Mo isotopic data from the Ediacaran Dengying Formation in the Gaojiashan section suggest multiple rapid short-term pulsed oxygenation and reduction events. An approximate correlation between the redox environments, palaeoproductivity and life events can be concluded as well. Based on the stratigraphic position, lithology, fossil records and geochemical characteristics, the entire profile of the Ediacaran Dengying Formation can be divided into five intervals. The redox environment of Interval I experienced fluctuations from predominantly anoxic to slightly suboxic environments, and then increased to a flexible dysoxic-oxic-anoxic environment during Interval II. Meanwhile, the productivity also frequently fluctuated at a relatively low level. The relatively unstable seawater and pulsing fluctuations of the redox conditions and palaeoproductivity can be correlated to the hydrothermal activities. From Interval III, the redox environments have been improved by several phases of oxygenation, from the relatively oxic-suboxic conditions at the beginning of Interval III to highly oxic conditions during Interval IV. Meanwhile, the palaeoproductivity soared after the early stage of Interval III and continuously increased to a high level until the later stage of Interval III and Interval IV. The highly oxic environment and continuously increasing palaeoproductivity resulted in the flourishing of the Ediacaran Gaojiashan fauna. From Interval V, both the redox conditions and the palaeoproductivity were at a low level, although they improved during the later stage, resulting in the previous Cloudina fauna disappearing. After comparing other contemporaneous profiles in South China and worldwide, we found that most profiles experienced similar variation of Ediacaran seawater redox environments that were under a chronically turbulent, with rapid short-term pulsed oxygenation and reduction events. This type of pulsed oxygenation did not deplete the local life community significantly. The regional depositional settings, redox environments and palaeoproductivity are the most important controlling factors of the life events. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001187918200001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77184]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Dong, Yunpeng; Long, Xiaoping |
| 作者单位 | 1.Goethe Univ Frankfurt Main, Inst Geowissensch, Altenhoferallee 1, D-60438 Frankfurt, Germany 2.Univ Melbourne, Sch Geog Earth & Atmospher Sci, 221 Bouverie St, Carlton, Vic 3053, Australia 3.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Northern Taibai Rd 229, Xian 710069, Peoples R China 4.Guangzhou Inst Geochem, Chinese Acad Sci, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Dong, Bohao,Dong, Yunpeng,Long, Xiaoping,et al. The Ediacaran palaeo-ocean environment in the northwest margin of South China Craton: Constraints of C-O-Mo isotopic and element geochemistry[J]. EARTH-SCIENCE REVIEWS,2024,250:33. |
| APA | Dong, Bohao.,Dong, Yunpeng.,Long, Xiaoping.,Hua, Hong.,Li, Jie.,...&Cheng, Chao.(2024).The Ediacaran palaeo-ocean environment in the northwest margin of South China Craton: Constraints of C-O-Mo isotopic and element geochemistry.EARTH-SCIENCE REVIEWS,250,33. |
| MLA | Dong, Bohao,et al."The Ediacaran palaeo-ocean environment in the northwest margin of South China Craton: Constraints of C-O-Mo isotopic and element geochemistry".EARTH-SCIENCE REVIEWS 250(2024):33. |
入库方式： OAI收割
来源：广州地球化学研究所
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