| LI Yanping,JIANG Shaoyong,YANG Tao.Br/Cl, I/Cl and chlorine isotopic compositions of pore water in shallow sediments: implications for the fluid sources in the Dongsha area, northern South China Sea[J].Acta Oceanologica Sinica,2017,36(4):31-36 |
| 利用孔隙水Br/Cl、I/Cl比和氯同位素组成来示踪南海北部东沙海域浅层流体来源 |
| Br/Cl, I/Cl and chlorine isotopic compositions of pore water in shallow sediments: implications for the fluid sources in the Dongsha area, northern South China Sea |
| 投稿时间：2015-12-19 修订日期：2016-05-05 |
| DOI：10.1007/s13131-017-1013-3 |
| 中文关键词: 卤族元素 氯同位素 沉积物孔隙水 东沙海域 |
| 英文关键词:halogen chlorine isotope pore water Dongsha area |
| 基金项目: |
| 作者 | 单位 | E-mail | | 李艳平 | 海岸与海岛开发教育部重点实验室, 地理与海洋学院, 南京大学, 南京 210093, 中国
中国南海研究协同创新中心, 南京 210093, 中国 | | | 蒋少涌 | 内生金属矿床国家重点实验室, 地球科学与工程学院, 南京大学, 南京 210093, 中国
地质过程与矿产资源国家重点实验室, 资源学院, 武汉 430074, 中国 | shyjiang@nju.edu.cn | | 杨涛 | 内生金属矿床国家重点实验室, 地球科学与工程学院, 南京大学, 南京 210093, 中国
中国南海研究协同创新中心, 南京 210093, 中国 | |
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| 英文摘要: |
| The Dongsha area is one of the most promising target areas for gas hydrate exploration in the South China Sea (SCS). The study of pore water geochemistry has played a key role in Chinese gas hydrate exploration. Br/Cl, I/Cl and δ37Cl in pore water were applied here in tracing gas hydrate occurrence, chemical evolution of pore fluids and water/rock interactions in low temperature sediment environments. The samples were collected from Sites HD255PC and HD309PC in the Dongsha area in 2004. At Site HD255PC, we found the elevated Br/Cl, I/Cl and decreased SO4/Cl at the depth of 4-5 m, suggestive of a laterally migrated fluid probably generated from the gas hydrate occurrence. The range of δ37Cl is -0.54‰ to +0.96‰, and positive δ37Cl at 4-5 m interval should be related with different diffusion rates between 35Cl and 37Cl. At Site HD309PC, a laterally migrated fluid was also found at the depth of 3-4 m, with the Br/Cl two times to that of the seawater and decreased I/Cl, indicating the fluid has no relationship with the gas hydrate. In this site, the chlorine isotopic composition varies from -0.7‰ to +1.9‰. Extra high Br/Cl might relate with the deep generated fluid. At higher temperature and pressure, the Br/Cl of the fluid is elevated during the hydrous silicate formation, while positive δ37Cl is also associated with the same mechanism. |
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