海洋沉积物SMTZ带黄铁矿莓球粒径增大现象的甲烷事件意义

王家生; 宋强; 林杞; 许力源; 陈粲; 王舟; 耿坤龙

doi:10.3799/dqkx.2024.132

Volume 50 Issue 3

Mar. 2025

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Article Navigation > Earth Science > 2025 > 50(3): 908-917

Wang Jiasheng, Song Qiang, Lin Qi, Xu Liyuan, Chen Can, Wang Zhou, Geng Kunlong, 2025. Enlargement of Pyrite Framboid Size in Sulfate-Methane Transition Zone of Marine Sediments and Its Implying of Marine Methane Event. Earth Science, 50(3): 908-917. doi: 10.3799/dqkx.2024.132

Citation:

Wang Jiasheng, Song Qiang, Lin Qi, Xu Liyuan, Chen Can, Wang Zhou, Geng Kunlong, 2025. Enlargement of Pyrite Framboid Size in Sulfate-Methane Transition Zone of Marine Sediments and Its Implying of Marine Methane Event. Earth Science, 50(3): 908-917. doi: 10.3799/dqkx.2024.132

Citation:

Wang Jiasheng, Song Qiang, Lin Qi, Xu Liyuan, Chen Can, Wang Zhou, Geng Kunlong, 2025. Enlargement of Pyrite Framboid Size in Sulfate-Methane Transition Zone of Marine Sediments and Its Implying of Marine Methane Event. Earth Science, 50(3): 908-917. doi: 10.3799/dqkx.2024.132

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Enlargement of Pyrite Framboid Size in Sulfate-Methane Transition Zone of Marine Sediments and Its Implying of Marine Methane Event

doi: 10.3799/dqkx.2024.132

1.
College of Marine Science and Technology & Hubei Key Laboratory of Marine Geological Resources; State Key Laboratory of Geomicrobiology and Environmental Changes, China University of Geosciences (Wuhan), Wuhan 430074, China
2.
National Institute for South China Sea Studies, Haikou 571100, China

Received Date: 2024-11-22
Publish Date: 2025-03-25

Abstract

Abstract

Single framboid size and deviation of pyrites in marine sediments or strata have been widely used as a useful proxy to indicate the seawater redox environment. However, our recent data about pyrite framboid size from the modern sediments bearing nature gas hydrate show a tremendous increasing trend in pyrite framboid size within the sulfate-methane transition zone (SMTZ), indicating the anaerobic oxidation of methane (AOM) dominated in SMTZ might play a key role to enhance the enlargement of pyrite framboid size. In case of large methane release caused by dissociation of gas hydrate (so called methane event), the rising SMTZ position would move up to shallow sediment or near seafloor and even into bottom seawater, most likely resulting into some anaerobic and acid environmental changes in bottom seawater. Meanwhile, the enhancing AOM coupled with the methane event will still greatly enlarge the pyrite framboid size in sediments. So in this situation, the traditional critical relationship between the pyrite framboid size and seawater redox environment will be no longer functional and need to be modified. It is proposed that the coupling of average framboid size > 20 μm or core size > 12 μm and deviation > 3 μm might be used as a critical proxy to indicate the environment of marine methane event.
- pyrite framboidal size,
- sulfate-methane transition zone,
- methane event,
- anaerobic oxidation of methane,
- seawater redox environment,
- sedimentology,
- mineralogy

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References(45)

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