Study on authigenic pyrite in sediments of gas hydrate geo-system in the Shenhu area, South China Sea

Chen Huichang; Lai Yong; Lu Hailong; Liang Jinqiang; Lu Jing'an; Fang Yunxin

doi:10.3969/j.issn.0253-4193.2018.07.010

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Chen Huichang, Lai Yong, Lu Hailong, Liang Jinqiang, Lu Jing'an, Fang Yunxin. Study on authigenic pyrite in sediments of gas hydrate geo-system in the Shenhu area, South China Sea[J]. Haiyang Xuebao, 2018, 40(7): 116-133. doi: 10.3969/j.issn.0253-4193.2018.07.010

Citation:

Chen Huichang, Lai Yong, Lu Hailong, Liang Jinqiang, Lu Jing'an, Fang Yunxin. Study on authigenic pyrite in sediments of gas hydrate geo-system in the Shenhu area, South China Sea[J]. Haiyang Xuebao, 2018, 40(7): 116-133. doi: 10.3969/j.issn.0253-4193.2018.07.010

Citation:

Chen Huichang, Lai Yong, Lu Hailong, Liang Jinqiang, Lu Jing'an, Fang Yunxin. Study on authigenic pyrite in sediments of gas hydrate geo-system in the Shenhu area, South China Sea[J]. Haiyang Xuebao, 2018, 40(7): 116-133. doi: 10.3969/j.issn.0253-4193.2018.07.010

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Study on authigenic pyrite in sediments of gas hydrate geo-system in the Shenhu area, South China Sea

doi: 10.3969/j.issn.0253-4193.2018.07.010

1.
School of Earth and Space Sciences, Peking University, Beijing 100871, China
2.
College of Engineering, Peking University, Beijing 100871, China
3.
Guangzhou Marine Geological Survey, Guangzhou 510075, China

Received Date: 2018-04-04
Rev Recd Date: 2018-05-02

Abstract

Abstract

Shenhu area of South China Sea is one of the most important research areas for natural gas hydrate in China. Geochemical and mineralogical characteristics were investigated in ten sediment samples, which included the sediments of gas-hydrate-bearing layer, collected from W19B site in Shenhu area. Analyses of major elements and X-ray diffraction indicated that several layers contained pyrite with unusual high content. The SEM images revealed that the pyrite crystals became more euhedral and the morphology varied from aggregate framboids to single framboid and finally tiny grain types as sediment depth increased, and some intermediate products in the textural evolution were also identified. Both 53.0 mbsf (meters below seafloor) and 140.4 mbsf layers were observed with significant abundances of pyrite. At the 140.4 mbsf layer, pyrite filling the chamber of the foraminifer shell was common and coupled with a large amount of columnar pyrite, which might be related to the anaerobic oxidation of organic matter and methane, especially with the anaerobic oxidation of methane (AMO). The layer of 140.4 mbsf might be close to the paleo sulfate-methane interface (SMI). Based on the results obtained, it is proposed that anomaly high AMO derived pyrites around 53.0 mbsf and 140.4 mbsf were probably related to the high methane flux, which might be resulted from the unusual methane events. The presence of several high pyrite layers might be related to the multi-stage methane events which might be caused by tectonic activities or the decompositions of gas hydrate in the depositional history.
- South China Sea,
- sediment,
- pyrite,
- gas hydrate,
- geochemistry,
- mineral morphology

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References(56)

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