Variable depositional environments and organic matter enrichment of Early Cambrian shales in the Middle Yangtze region, South China

Liu, Wei; Gao, Ping; Xiao, Xianming; Zhao, Yanming; Xing, Yijie; Li, Jinku

doi:10.1016/j.jseaes.2023.105874

Journal of Asian Earth Sciences

2024

DOI: 10.1016/j.jseaes.2023.105874

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Variable depositional environments and organic matter enrichment of Early Cambrian shales in the Middle Yangtze region, South China

Wei Liu,

Ping Gao,

Xianming Xiao

et al.

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2024

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Cited by 4 publications

References 98 publications

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Widespread coastal upwelling along the marginal Yangtze Platform (South China) during the early Cambrian: Implications for hyper-enrichment of organic matter

Li,

Gao,

Xiao

et al. 2024

Palaeogeography, Palaeoclimatology, Palaeoecology

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Widespread coastal upwelling along the marginal Yangtze Platform (South China) during the early Cambrian: Implications for hyper-enrichment of organic matter

Li,

Gao,

Xiao

et al. 2024

Palaeogeography, Palaeoclimatology, Palaeoecology

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Restoration of hydrocarbon generation potential of the highly mature Lower Cambrian Yuertusi Formation source rocks in the Tarim Basin

Hu,

Jia,

Chen

et al. 2024

Petroleum Science

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Organic matter enrichment model of Permian Capitanian-Changhsingian black shale in the intra-platform basin of Nanpanjiang basin

Zhang,

Cao,

Lan

et al. 2024

Front. Earth Sci.

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The Permian Capitanian-Changhsingian black shale formed in intra-platform basins are the major source rocks in Southwest China. However, the depositional conditions and organic matter accumulation of these black shales are not well understood. In this study, geochemical characteristics comprise TOC, major, trace and REEs from sixty-two samples from the studied outcrop in Northern Nanpanjiang Basin, Southwest China are systematically investigated to determine silicon source, paleo-ocean productivity, and paleo-redox conditions to reveal their influence on organic matter enrichment under 3rd-order sequence. The Capitanian-Changhsingian black shale in the study area is the result of the combined effects of active extensional activity, high paleo-productivity maintained by volcanic activity, and dysoxic and anoxic conditions represented by biological extinction events. There are differences in the factors controlling organic matter accumulation in black shale at different stages. The controlling factors for the organic enrichment during Capitanian (SQ2) are the rapidly deepening water mass of extensional rifts and the high productivity induced by volcanic ash in the igneous provinces, as well as the global anoxic event represented by “negative carbon isotope shift.” The controlling factors during Changhsingian are the deepening of water mass under the reactivation of extensional rifts, resulting in a dysoxic environment, and the high productivity maintained by volcanic activity in South China. The Wuchiapingian black shale was formed under dysoxic conditions under the stagnation of extensional activity, and intermittent volcanic activity in South China maintained the high paleo-productivity level of the Wuchiapingian stage.

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Variable depositional environments and organic matter enrichment of Early Cambrian shales in the Middle Yangtze region, South China

Cited by 4 publications

References 98 publications

Widespread coastal upwelling along the marginal Yangtze Platform (South China) during the early Cambrian: Implications for hyper-enrichment of organic matter

Widespread coastal upwelling along the marginal Yangtze Platform (South China) during the early Cambrian: Implications for hyper-enrichment of organic matter

Restoration of hydrocarbon generation potential of the highly mature Lower Cambrian Yuertusi Formation source rocks in the Tarim Basin

Organic matter enrichment model of Permian Capitanian-Changhsingian black shale in the intra-platform basin of Nanpanjiang basin

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