Geochemistry of pore waters from HQ-1PC of the Qiongdongnan Basin, northern South China Sea, and its implications for gas hydrate exploration

被引：0
作者：
Tao Yang
ShaoYong Jiang
Lu Ge
JingHong Yang
NengYou Wu
GuangXue Zhang
Jian Liu
DaoHua Chen
机构：
[1] Nanjing University,State Key Laboratory for Mineral Deposits Research, Center for Marine Geochemistry Research, Department of Earth Sciences
[2] Guangzhou Marine Geological Survey,undefined
来源：
Science China Earth Sciences | 2013年 / 56卷
关键词：
pore water; geochemistry; gas hydrate; Qiongdongnan Basin;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The Qiongdongnan Basin is one of the target areas for marine gas hydrate exploration in the northern margin of the South China Sea. In this study, major anion (e.g., SO4−2, Cl, Br, I), cation (e.g., Ca, Mg, K, Na), and trace element (e.g., Sr, Ba) concentrations of pore water samples collected from site HQ-1PC in the Qiongdongnan Basin were analyzed. These geochemical data suggest that the process of AOM (Anaerobic Oxidation of Methane) is dominant in sulfate-reduction zone in this site due to high upwelling iodine flux and strong microbial activities. The iodine-rich fluids, which may carry methane for the gas hydrate formation, pass through the gas hydrate stability zone, mix with brine released during gas hydrate formation, and cause the geochemical anomalies observed at site HQ-1PC. The pore water geochemical characteristics and anomalies in the Qiongdongnan Basin are quite similar to those found in other gas hydrate locations in the Shenhu area in the northern South China Sea, and a genetic link is suggested with the possibility of gas hydrate occurrence in the study area.
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页码：521 / 529
页数：8
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