奥陶纪-志留纪转折期火山活动与异常高有机质沉积：以中国华南地区为例

孔维亮; 邱振; 张家强; 张琴; 刘雯; 曲天泉; 高万里; 蔡光银; 江冲

doi:10.3799/dqkx.2025.125

Volume 50 Issue 12

Dec. 2025

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Article Navigation > Earth Science > 2025 > 50(12): 4583-4603

Kong Weiliang, Qiu Zhen, Zhang Jiaqiang, Zhang Qin, Liu Wen, Qu Tianquan, Gao Wanli, Cai Guangyin, Jiang Chong, 2025. Volcanic Activity and Extraordinarily High Organic Matter Deposition across Ordovician-Silurian Transition: A Case Study from South China. Earth Science, 50(12): 4583-4603. doi: 10.3799/dqkx.2025.125

Citation:

Kong Weiliang, Qiu Zhen, Zhang Jiaqiang, Zhang Qin, Liu Wen, Qu Tianquan, Gao Wanli, Cai Guangyin, Jiang Chong, 2025. Volcanic Activity and Extraordinarily High Organic Matter Deposition across Ordovician-Silurian Transition: A Case Study from South China. Earth Science, 50(12): 4583-4603. doi: 10.3799/dqkx.2025.125

Citation:

Kong Weiliang, Qiu Zhen, Zhang Jiaqiang, Zhang Qin, Liu Wen, Qu Tianquan, Gao Wanli, Cai Guangyin, Jiang Chong, 2025. Volcanic Activity and Extraordinarily High Organic Matter Deposition across Ordovician-Silurian Transition: A Case Study from South China. Earth Science, 50(12): 4583-4603. doi: 10.3799/dqkx.2025.125

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Volcanic Activity and Extraordinarily High Organic Matter Deposition across Ordovician-Silurian Transition: A Case Study from South China

doi: 10.3799/dqkx.2025.125

Kong Weiliang^{1, 2
,
,},
Qiu Zhen^{1, 2
,
,
,},
Zhang Jiaqiang³,
Zhang Qin^{1, 2},
Liu Wen^{1, 2},
Qu Tianquan^{1, 4},
Gao Wanli^{1, 4},
Cai Guangyin¹,
Jiang Chong^{1, 5}

1.
PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
2.
National Energy Shale Gas R & D (Experiment) Center, Beijing 100083, China
3.
School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
4.
College of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
5.
College of Geosciences, China University of Petroleum (Beijing), Beijing 102299, China

Received Date: 2025-02-10
Publish Date: 2025-12-25

Abstract

Abstract

Large-scale volcanic activity is recognized as one of the critical drivers of global climate and environmental changes, as well as biodiversity fluctuations. It can enhance marine surface primary productivity and promote the development of euxinic bottom water conditions, thus facilitating organic-rich sedimentation. Across the Ordovician-Silurian transition, intense global volcanic activities coincided with the widespread deposition of black shales and the development of organic-rich intervals characterized by extraordinarily high total organic matter (TOC≥3.0%). Based on more than 800 samples, including TOC, major and trace elements, mercury (Hg) concentrations and Hg isotopes, collected from over 20 typical wells and sections of the Wufeng-Lungmachi formations in South China, this study discusses the occurrence and identification features of visible volcanic ash layers and highlights the application of major and trace elements, Hg concentrations and isotopes to identify cryptotephra. Furthermore, the impact of volcanic activity on marine environmental changes and the formation of extraordinarily high organic matter deposits were investigated. The results suggest follows. (1) The distribution of visible volcanic ash and cryptotephra provides a robust basis for reconstructing volcanic history of this period. (2) Elevated phosphorus inputs from volcanic activity enhanced marine surface primary productivity and expanded the extent of anoxic bottom water. (3) The anoxic conditions promoted phosphorus recycling, thereby sustaining high primary productivity. (4) Enhanced volcanic weathering increased sulfate input, which could further promote euxinic conditions. Sustained volcanic activities and their associated climate and environmental effects contributed to the high primary productivity and euxinic conditions, ultimately leading to the extraordinarily high organic matter accumulation in the Wufeng-Lungmachi shale.

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References(129)

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Volcanic Activity and Extraordinarily High Organic Matter Deposition across Ordovician-Silurian Transition: A Case Study from South China

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