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| DOI | 10.1007/s11430-023-1313-2 |
| A novel model of the carbon cycle in the Cambrian ocean | |
| 发表日期 | 2024 |
| ISSN | 1674-7313 |
| EISSN | 1869-1897 |
| 英文摘要 | The classic model of the carbon cycle suggests that the extensive burial of 12C-enriched organic carbon leads to a positive carbon isotope (delta 13C) excursion (CIE), while massive oxidation of organic carbon results in a negative CIE. However, global events such as the BAsal Cambrian Carbon isotope Excursion (BACE) and the Steptoean Positive Carbon Isotope Excursion (SPICE) are global negative and positive delta 13C excursions, respectively, and they also exhibit significant organic carbon burial anomalies, displaying decoupling between carbon isotope anomalies and organic carbon burial. Based on the analyses of the Cambrian carbon cycle and paleoceanographic evolution records from well Tadong2 in the Tarim Basin, we propose a novel model of the carbon cycle in the Cambrian ocean that incorporates oceanic dissolved organic carbon (DOC). Our findings are as follows. (1) The Cambrian ocean maintained substantial DOC reservoirs, which were regulated by ocean currents and paleo-redox conditions and exerted significant influence on the oceanic carbon cycle. (2) The oxidation of the oceanic DOC reservoirs during the early Cambrian led to the BACE and the Asian Phenomenon of the Cambrian petroleum systems, while the expansion of the oceanic DOC reservoirs during the SPICE resulted in a global positive delta 13C excursion and the absence of significant organic carbon burial. (3) The deep-basin sedimentary environment in the eastern depression of the Tarim Basin may have fostered the development of organic-rich black shales during the Furongian Series, corresponding to organic carbon burial during the SPICE and representing potential prospects for ultra-deep oil and gas exploration. Future research should focus on the formation mechanism, reserve scale, and influencing factors of the oceanic DOC reservoirs, as well as their resource and environmental effects. It is expected that new breakthroughs will be made in the fields of Earth system science and oil and gas exploration. |
| 英文关键词 | Carbon isotope; Organic carbon; BACE; SPICE; Dissolved organic carbon; Climate change; Black shale |
| 语种 | 英语 |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS记录号 | WOS:001230128000003 |
| 来源期刊 | SCIENCE CHINA-EARTH SCIENCES
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/304052 |
| 作者单位 | China National Petroleum Corporation; Peking University |
| 推荐引用方式 GB/T 7714 | . A novel model of the carbon cycle in the Cambrian ocean[J],2024. |
| APA | (2024).A novel model of the carbon cycle in the Cambrian ocean.SCIENCE CHINA-EARTH SCIENCES. |
| MLA | "A novel model of the carbon cycle in the Cambrian ocean".SCIENCE CHINA-EARTH SCIENCES (2024). |
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