南海东沙海域末次冰期异常沉积事件与水合物分解

陈芳; 庄畅; 张光学; 陆红锋; 段虓; 周洋; 苏新; 吴聪; 刘广虎

doi:10.3799/dqkx.2014.144

Volume 39 Issue 11

Nov. 2014

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Article Navigation > Earth Science > 2014 > 39(11): 1517-1526

Chen Fang, Zhuang Chang, Zhang Guangxue, Lu Hongfeng, Duan Xiao, Zhou Yang, Su Xin, Wu Cong, Liu Guanghu, 2014. Abnormal Sedimentary Events and Gas Hydrate Dissociation in Dongsha Area of the South China Sea during Last Glacial Period. Earth Science, 39(11): 1517-1526. doi: 10.3799/dqkx.2014.144

Citation:

Chen Fang, Zhuang Chang, Zhang Guangxue, Lu Hongfeng, Duan Xiao, Zhou Yang, Su Xin, Wu Cong, Liu Guanghu, 2014. Abnormal Sedimentary Events and Gas Hydrate Dissociation in Dongsha Area of the South China Sea during Last Glacial Period. Earth Science, 39(11): 1517-1526. doi: 10.3799/dqkx.2014.144

Citation:

Chen Fang, Zhuang Chang, Zhang Guangxue, Lu Hongfeng, Duan Xiao, Zhou Yang, Su Xin, Wu Cong, Liu Guanghu, 2014. Abnormal Sedimentary Events and Gas Hydrate Dissociation in Dongsha Area of the South China Sea during Last Glacial Period. Earth Science, 39(11): 1517-1526. doi: 10.3799/dqkx.2014.144

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Abnormal Sedimentary Events and Gas Hydrate Dissociation in Dongsha Area of the South China Sea during Last Glacial Period

doi: 10.3799/dqkx.2014.144

Chen Fang^{1, 2
,},
Zhuang Chang^{1, 2},
Zhang Guangxue^{1, 2},
Lu Hongfeng^{1, 2},
Duan Xiao^{1, 2},
Zhou Yang^{1, 2},
Su Xin³,
Wu Cong^{1, 2},
Liu Guanghu^{1, 2}

1.
Key Laboratory of Marine Mineral Resources, Ministry of Land and Resources, Guangzhou 510075, China
2.
Guangzhou Marine Geological Survey, Guangzhou 510075, China
3.
School of Ocean Sciences, China University of Geosciences, Beijing 100083, China

Received Date: 2014-04-03
Publish Date: 2014-11-01

Abstract

Abstract

Core 973-3 is located at the potential gas hydrate area on the slope within Dongsha area of the South China Sea, with the water depth of 1026m. According to the sedimentology, chronology, isotope and B/Ca ratio of the foraminiferal tests, carbonate and pyrite content, the light δ¹³C values of planktonic Globigerinoides ruber and benthic Uvigerina peregrine are found in several core layers with the most negative value of -2.03‰. In the δ¹³C distinctly depleted layers, the concentration of environmental [CO₃^2-] is relatively low, and the pyrites are abundant up to 17%, which indicates abnormal seepage of methane. Below the δ¹³C depleted layers, the carbonate intensely dissolves, and its content decreases to the bottom. It suggests that it has probably been caused by the gas hydrate dissociation. The seepage and anaerobic oxidation of methane resulted from the dissociation and release of gas hydrates is the primary reason of the depleted δ¹³C values of foraminiferal tests, carbonate dissolution and the deposits of enormous pyrites. Methane release events occurred in the last glacial period, which implies that the descending sea level induced the gas hydrate dissociation. According to the δ¹³C depleted record of foraminiferas, it is concluded that there were at least four times release events of methane, and their intensities were almost at the same level.
- gas hydrate dissociation,
- depleted δ¹³C,
- carbonate dissolution,
- last glacial period,
- Dongsha slope,
- marine geology

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References(40)

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