| 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 |
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| 引用本文： | 李艳平,蒋少涌,杨涛.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[J].海洋学报(英文版),2017,36(4):31-36. |
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| 作者姓名： | 李艳平 蒋少涌 杨涛 |
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| 作者单位： | 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,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,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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| 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 HD255 PC and HD309 PC in the Dongsha area in 2004.At Site HD255 PC,we found the elevated Br/Cl,I/Cl and decreased SO_4/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 δ~(37)Cl at 4–5 m interval should be related with different diffusion rates between ~(35)Cl and ~(37)Cl.At Site HD309 PC,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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| 关 键 词： | 卤族元素 氯同位素 沉积物孔隙水 东沙海域 |
| 收稿时间： | 2015/12/19 0:00:00 |
| 修稿时间： | 2016/5/5 0:00:00 |
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 |
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| LI Yanping,JIANG Shaoyong and 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. |
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| Authors: | LI Yanping JIANG Shaoyong and YANG Tao |
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| Affiliation: | Ministry of Education Key Laboratory for Coast and Island Development, School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210093, China;Collaborative Innovation Center of South China Sea Studies, Nanjing 210093, China,State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China;State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China and State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China;Collaborative Innovation Center of South China Sea Studies, Nanjing 210093, China |
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| Abstract: | 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 δ 37Cl 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 δ 37Cl is–0.54‰ to +0.96‰, and positive δ 37Cl 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 δ 37Cl is also associated with the same mechanism. |
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| Keywords: | halogen chlorine isotope pore water Dongsha area |
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