中上扬子地区奥陶纪-志留纪之交火山作用对有机质富集的影响

卢贤志; 沈俊; 郭伟; 冯庆来

doi:10.3799/dqkx.2020.258

Volume 46 Issue 7

Jul. 2021

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Lu Xianzhi, Shen Jun, Guo Wei, Feng Qinglai, 2021. Influence of Mercury Geochemistry and Volcanism on the Enrichment of Organic Matter near the Ordovician Silurian Transition in the Middle and Upper Yangtze. Earth Science, 46(7): 2329-2340. doi: 10.3799/dqkx.2020.258

Citation:

Lu Xianzhi, Shen Jun, Guo Wei, Feng Qinglai, 2021. Influence of Mercury Geochemistry and Volcanism on the Enrichment of Organic Matter near the Ordovician Silurian Transition in the Middle and Upper Yangtze. Earth Science, 46(7): 2329-2340. doi: 10.3799/dqkx.2020.258

Citation:

Lu Xianzhi, Shen Jun, Guo Wei, Feng Qinglai, 2021. Influence of Mercury Geochemistry and Volcanism on the Enrichment of Organic Matter near the Ordovician Silurian Transition in the Middle and Upper Yangtze. Earth Science, 46(7): 2329-2340. doi: 10.3799/dqkx.2020.258

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Influence of Mercury Geochemistry and Volcanism on the Enrichment of Organic Matter near the Ordovician Silurian Transition in the Middle and Upper Yangtze

doi: 10.3799/dqkx.2020.258

Lu Xianzhi^{1, 2
,
,},
Shen Jun^{1
,
,},
Guo Wei¹,
Feng Qinglai^{1, 2}

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
2.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Received Date: 2020-08-28
Publish Date: 2021-07-15

Abstract

Abstract

In order to investigate the influence of volcanism on the enrichment mechanism of organic matter in black mudstone, we analysis mercury, total sulfur, total organic carbon and barium concentrations from core JY 143-5 in Wulong District, Chongqing, exploring the relationship between volcanisms and enrichments of organic matter near the Ordovician-Silurian transition (Wufeng Formation-Longmaxi Formation) in the middle and upper Yangtze region. The results show that the enrichment intervals of mercury (the bottom of Longmaxi Formation) corresponds to the high values of marine productivity (total organic carbon and biological barium). Furthermore, the thickness of volcanic ash in the upper Yangtze area has a strong relationship with the spatial distribution of total organic carbon content, which also support the hypotheses that volcanism is closely related to the enrichment of organic matter. Therefore, this study suggests that multiple and extensive volcanic eruptions were likely tobe the main cause of the enrichment of organic matter between Ordovician and Silurian in middle-upper Yangtze region.
- shale gas,
- biological barium,
- mercury,
- anoxia,
- black shale,
- geochemistry

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Influence of Mercury Geochemistry and Volcanism on the Enrichment of Organic Matter near the Ordovician Silurian Transition in the Middle and Upper Yangtze

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