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- W2364392854 abstract "Geochemical characteristics of the shallow sediments from sites HD319,HD196Aand GC10in Dongsha gas hydrate distribution area,the northern slope of South China Sea was discribed in the present paper.Complicated authigenic minerals were identified by XRD and SEM,such as miscellaneous carbonates,sulphates and pyrite,which consistently indicate the existence of gas hydrate and methane seep in the research area.Chemical analysis of pore water from the sediments showed that the concentrations of SO42-,Ca2+,Mg2+and Sr2+decrease clearly,whereas CH4and H2S as well as the ratios of Mg2+/Ca2+and Sr2+/Ca2+increase sharply as the depth increases.These geochemical characteristics are similar to the chemical compositions abnormalities in pore water of the shallow sediments,where gas hydrate forms in the other parts of the world.There should be a great amount of gas sources in the research area,based on the occurrence of free hydrocarbon in the headspace gas and the distribution pattern of chemical compositions in the sediments,specially the concentrations of SO42-,H2S and CH4which changed sharply with depth.Furthermore,the results strongly suggest that there should be gas hydrates underneath,and the sulphatemethane interface(SMI)should be shallow,about 8mbelow the seafloor in the research area." @default.
- W2364392854 created "2016-06-24" @default.
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- W2364392854 date "2010-01-01" @default.
- W2364392854 modified "2023-09-25" @default.
- W2364392854 title "GEOCHEMICAL CHARACTERISTICS OF SHALLOW SEDIMENTS IN THE GAS HYDRATE DISTRIBUTION AREA OF DONGSHA,THE NORTHERN SOUTH CHINA SEA" @default.
- W2364392854 hasPublicationYear "2010" @default.
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