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《Geochimica》 2017-06
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Gas hydrate occurrences inferred from pore water geochemistry in the pockmark field in the southwestern Xisha Uplift, South China Sea

CHEN Lin-ying;LUO Min;Shanghai Engineering Research Center of Hadal Science and Technology, College of Marine Sciences, Shanghai Ocean University;Evaluation and Detection Technology Laboratory of Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology;  
Mega-pockmarks are widely scattered throughout the southwestern Xisha Uplift, northern South China Sea(SCS). Pore water collected from a gravity-core inside of a mega-pockmark exhibited a decrease in the Cl-concentration concomitant with an increase in the δ~(18)O value at the interval of 5.7~6.7 m below the seafloor, suggesting a possible gas hydrate occurrence. The Cl~-, Na~+, and K~+ concentrations cluster mainly along the seawater freshening line without a distinct Na~+ enrichment and K~+ depletion. The gas hydrate contents were estimated to be between 6%~10%, and 7%~15%, respectively, according to the Cl-concentration offsets and the δ~(18)O values obtained from the baselines. The southwestern Xisha Uplift pockmark field is likely to be a good prospective area for the occurrence of gas hydrates in the shallow sediments.
【Fund】: 广州海洋地质调查局外协项目(GZH201100305-06-07);; 海洋矿产资源评价与探测技术功能实验室开放基金项目(KC201704)
【CateGory Index】: P744.4
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