首页|A novel model of the carbon cycle in the Cambrian ocean

A novel model of the carbon cycle in the Cambrian ocean

扫码查看
原文链接
  • 万方数据
  • 维普
The classic model of the carbon cycle suggests that the extensive burial of 12C-enriched organic carbon leads to a positive carbon isotope(δ13C)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 δ13C 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 δ13C 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.

Carbon isotopeOrganic carbonBACESPICEDissolved organic carbonClimate changeBlack shale

Huajian WANG、Shuichang ZHANG、Xiaomei WANG、Jin SU、Yuntao YE、Yuke LIU

展开 >

Key Laboratory of Petroleum Geochemistry Research Institute of Petroleum Exploration and Development,China National Petroleum Corporation,Beijing 100083,China

Key Laboratory of Orogenic Belts and Crustal Evolution,School of Earth and Space Sciences,Peking University,Beijing 100871,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaBasic and Forward-Looking Major Technology Projects of China National Petroleum CorporationNational Key Research and Development Program of ChinaStrategic Priority Research Program of the Chinese Academy of Sciences

4222530342372162421021462023ZZ02032017YFC0603101XDA14010101

2024

10.1007/s11430-023-1313-2

中国科学:地球科学(英文版)
中国科学院

中国科学:地球科学(英文版)

影响因子：1.002
ISSN：1674-7313
年,卷(期)：2024.67(6)