Knowledge Management System Of Guangzhou Institute of Geochemistry，CAS
| Yang, Wei1,2,3; He, Sheng4; Wu, Zhongrui4; Zhai, Gangyi5; Chen, Rui1,3; Ning, Zijie1,3; Lai, Hongfei1,3; Ren, Jinfeng1,3; Xu, Chenlu1,2,3 | |
| Palaeoenvironment characteristics of the Ediacaran Doushantuo Shale, Yichang area, South China: Implications for organic matter accumulation mechanism | |
| Source Publication | FUEL
 |
| ISSN | 0016-2361 |
| 2024-02-01 | |
| Volume | 357Pages:17 |
| DOI | 10.1016/j.fuel.2023.129673 |
| Language | 英语 |
| WOS Research Area | Energy & Fuels ; Engineering |
| Abstract | The organic-rich Ediacaran Doushantuo Shale have been identified as a high-quality source rock and a main shale gas play in the Yichang area, South China, which was characterized by high TOC content, high thermal maturity, enormous cumulative thickness, and relatively high contents of brittle minerals. As the oldest shale gas stratum, the paleo-environmental characteristics and organic matter (OM) accumulation mechanism remain unclear in this special marine setting. In this study, core descriptions, TOC content, X-ray diffraction (XRD) mineralogical analysis, scanning electron microscopy (SEM) observation, and elemental analysis, including the major, trace, and rare earth elements, were combined to identify lithofacies, reconstruct paleo-environmental conditions, and document organic matter (OM) accumulation mechanisms for this potential Ediacaran Doushantuo Shale in the Yichang area, South China. Four major shale lithofacies were identified based on TOC content and mineral composition. The geochemical redox proxies, such as the enrichment factors of Uranium (U-EF) and ratio of organic carbon to total phosphorus (Corg/P), indicate that the Doushantuo Shale was probably deposited in a dysoxic-anoxic conditions, which is consist with the interpretation from size distribution of pyrite framboids. The terrigenous influxes suggest the Doushantuo Shale was deposited in arid climate in absence of chemical weathering. Meanwhile, the productivity proxies (biogenic SiO2, Ba, and P/Al) indicate that the organic-rich Doushantuo Shale was deposited under a relatively low primary productivity. In addition, hydrothermal input has limited influence on organic matter (OM) accumulation of the Doushantuo Shale, which was also reported in the Qinglinkou Section of Yichang area. It can be observed that the organic matter (OM) accumulation mechanism of the Doushantuo Shale, deposited after the Marinoan "Snow Earth" glaciation, in the Yichang area, South China, was mainly controlled by the redox conditions, which is much different from typical marine shales and transitional shales. |
| Keyword | Geochemical characteristics Paleo-environmental conditions Organic matter accumulation mechanism Ediacaran Doushantuo Shale Yichang area |
| WOS ID | WOS:001075938500001 |
| Indexed By | SCI |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.gig.ac.cn/handle/344008/74876 |
| Collection | 有机地球化学国家重点实验室 |
| Corresponding Author | He, Sheng; Xu, Chenlu |
| Affiliation | 1.Natl Engn Res Ctr Gas Hydrate Explorat & Dev, Guangzhou 511458, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China 3.China Geol Survey, Minist Nat Resources, Key Lab Marine Mineral Resources, Guangzhou Marine Geol Survey, Guangzhou 511458, Peoples R China 4.China Univ Geosci, Key Lab Tecton & Petr Resources, Minist Educ, Wuhan 430074, Peoples R China 5.China Geol Survey, Oil & Gas Survey, Beijing 100083, Peoples R China |
| Recommended Citation GB/T 7714 | Yang, Wei,He, Sheng,Wu, Zhongrui,et al. Palaeoenvironment characteristics of the Ediacaran Doushantuo Shale, Yichang area, South China: Implications for organic matter accumulation mechanism[J]. FUEL,2024,357:17. |
| APA | Yang, Wei.,He, Sheng.,Wu, Zhongrui.,Zhai, Gangyi.,Chen, Rui.,...&Xu, Chenlu.(2024).Palaeoenvironment characteristics of the Ediacaran Doushantuo Shale, Yichang area, South China: Implications for organic matter accumulation mechanism.FUEL,357,17. |
| MLA | Yang, Wei,et al."Palaeoenvironment characteristics of the Ediacaran Doushantuo Shale, Yichang area, South China: Implications for organic matter accumulation mechanism".FUEL 357(2024):17. |
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