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OS1C-5：DISTRIBUTION OF THE METHANE HYDRATE IN THE NORTHERN SOUTHERN CHINA SEA DURING THE LAST GLACIAL MAXIMUM
发布时间:2014-07-28
Lihua LIU1, Shaoying FU2, Nengyou WU1
1.Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, China; 2.Guangzhou Marine Geological Survey, China
The South China Sea (SCS) is locates in the south of mainland China and the island of Taiwan, and bordered on three sides by passive continental margins and to the east by active continental margin. Since the cessation of the sea floor spreading ~ 15.5 Ma ago, the SCS has received large amounts of sediments with maximum thickness of Cenozoic deposits exceeding 10 km. The sedimentation rate at Site 1144 in last 1 Ma was high and with 60-70% terrigenous clastics (Wang et al. 2000), and during the Late Pliocene the sedimentation rates exceeded 100 cm ky-1 with burial of large amounts of organic matter. This organic matter is the source of early diagnetic, microbially generated methane pervasively found throughout the sediment sequences. The generated methane could partially form methane hydrate and preserved in the marine sediment under certain environmental conditions. Therefore, enough methane was reserved and geochemically reacted subsequently since then on, till around 18000 years ago, the last coldest time period, also referred to as the Last Glacial Maximum (LGM). Evidence indicated that the sea level was ~ 150 m shallower and the bottom water temperature around 2ºC lower than current level during LGM in the South China Sea (SCS). The inventory of the methane hydrates was suggested to reaches its peak. The distribution of the methane hydrates could be estimated with to paleoceanographic and environmental conditions.
1.Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, China; 2.Guangzhou Marine Geological Survey, China
The South China Sea (SCS) is locates in the south of mainland China and the island of Taiwan, and bordered on three sides by passive continental margins and to the east by active continental margin. Since the cessation of the sea floor spreading ~ 15.5 Ma ago, the SCS has received large amounts of sediments with maximum thickness of Cenozoic deposits exceeding 10 km. The sedimentation rate at Site 1144 in last 1 Ma was high and with 60-70% terrigenous clastics (Wang et al. 2000), and during the Late Pliocene the sedimentation rates exceeded 100 cm ky-1 with burial of large amounts of organic matter. This organic matter is the source of early diagnetic, microbially generated methane pervasively found throughout the sediment sequences. The generated methane could partially form methane hydrate and preserved in the marine sediment under certain environmental conditions. Therefore, enough methane was reserved and geochemically reacted subsequently since then on, till around 18000 years ago, the last coldest time period, also referred to as the Last Glacial Maximum (LGM). Evidence indicated that the sea level was ~ 150 m shallower and the bottom water temperature around 2ºC lower than current level during LGM in the South China Sea (SCS). The inventory of the methane hydrates was suggested to reaches its peak. The distribution of the methane hydrates could be estimated with to paleoceanographic and environmental conditions.
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