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

LI Yanping; JIANG Shaoyong; YANG Tao

doi:10.1007/s13131-017-1013-3

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

doi: 10.1007/s13131-017-1013-3

1.
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
2.
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
3.
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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- 收稿日期: 2015-12-19
- 修回日期: 2016-05-05

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

1.
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
2.
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
3.
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

摘要

- 卤族元素 /
- 氯同位素 /
- 沉积物孔隙水 /
- 东沙海域
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 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.
- halogen /
- chlorine isotope /
- pore water /
- Dongsha area

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参考文献(48)

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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

doi: 10.1007/s13131-017-1013-3

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出版历程

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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出版历程

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