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

Article Contents

Article Navigation > Acta Oceanologica Sinica > 2017 > 36(4): 31-36

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. doi: 10.1007/s13131-017-1013-3

Citation:

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. doi: 10.1007/s13131-017-1013-3

Citation:

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. doi: 10.1007/s13131-017-1013-3

PDF( 973 KB)

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

doi: 10.1007/s13131-017-1013-3

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

Received Date: 2015-12-19
Rev Recd Date: 2016-05-05

Abstract

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

FullText(HTML)

References(48)

References

Bagheri R, Nadri A, Raeisi E, et al. 2014. Hydrochemical and isotopic (δ¹⁸O, δ²H, ⁸⁷Sr/⁸⁶Sr, δ³⁷Cl and δ⁸¹Br) evidence for the origin of saline formation water in a gas reservoir. Chemical Geology, 384:62-75

Chao Hungchun, You Chenfeng. 2006. Distribution of B, Cl and their isotopes in pore waters separated from gas hydrate potential areas, offshore southwestern Taiwan. Terrestrial Atmospheric and Oceanic Sciences, 17(4):961-979

Desaulniers D E, Kaufmann R S, Cherry J A, et al. 1986. ³⁷Cl-³⁵Cl variations in a diffusion-controlled groundwater system. Geochimica et Cosmochimica Acta, 50(8):1757-1764

Eastoe C J, Guilbert J M. 1992. Stable chlorine isotopes in hydrothermal processes. Geochimica et Cosmochimica Acta, 56(12):4247-4255

Eastoe C J, Long A, Knauth L P. 1999. Stable chlorine isotopes in the Palo Duro Basin, Texas:evidence for preservation of Permian evaporite brines. Geochimica et Cosmochimica Acta, 63(9):1375-1382

Eastoe C J, Long A, Land L S, et al. 2001. Stable chlorine isotopes in halite and brine from the Gulf Coast Basin:brine genesis and evolution. Chemical Geology, 176(1-4):343-360

Eggenkamp H G M, Kreulen R, Koster Van Groos A F. 1995. Chlorine stable isotope fractionation in evaporites. Geochimica et Cosmochimica Acta, 59(24):5169-5175

Eggenkamp H G M, Middelburg J J, Kreulen R. 1994. Preferential diffusion of ³⁵Cl relative to ³⁷Cl in sediments of Kau Bay, Halmahera, Indonesia. Chemical Geology, 116(3-4):317-325

Ge Lu, Jiang Shaoyong, Swennen R, et al. 2010. Chemical environment of cold seep carbonate formation on the northern continental slope of South China Sea:evidence from trace and rare earth element geochemistry. Marine Geology, 277(1-4):21-30

Godon A, Jendrzejewski N, Eggenkamp H G M, et al. 2004. A cross-calibration of chlorine isotopic measurements and suitability of seawater as the international reference material. Chemical Geology, 207(1-2):1-12

Gong Yuehua, Yang Shengxiong, Wang Hongbin, et al. 2009. Gas hydrate reservoir characteristics of Shenhu area, North slope of the South China Sea. Geoscience (in Chinese), 23(2):210-216

Helgeson H C, Kirkham D H, Flowers G C. 1981. Theoretical prediction of the thermodynamic behavior of aqueous electrolytes at high pressures and temperatures:IV. Calculation of activity coefficients, osmotic coefficients, and apparent molal and standard and relative partial molal properties to 600°C and 5 kb. American Journal of Science, 281(10):1249-1516

Holser W T. 1970. Bromide geochemistry of some non-marine salt deposits in the southern Great Basin. Mineralogical Society of America Special Paper, 3:307-319

Jiang Tao, Xie Xinong, Chen Hui, et al. 2015. Geochemistry of pore water and associated diagenetic reactions in the diapiric area of Yinggehai basin, northwestern South China Sea. Journal of Earth Science, 26(3):306-316

Jiang Shaoyong, Yang Tao, Ge Lu, et al. 2008. Geochemistry of pore waters from the Xisha Trough, northern South China Sea and their implications for gas hydrates. Journal of Oceanography, 64(3):459-470

Jiang Shaoyong, Yang Tao, Xue Zichen, et al. 2005. Chlorine and sulfate concentrations in pore waters from marine sediments in the north margin of the South China Sea and their implications for gas hydrate exploration. Geoscience (in Chinese), 19(1):45-54

John T, Scambelluri M, Frische M, et al. 2011. Dehydration of subducting serpentinite:implications for halogen mobility in subduction zones and the deep halogen cycle. Earth and Planetary Science Letters, 308(1-2):65-76

Kaufmann R, Long A, Bentley H, et al. 1984. Natural chlorine isotope variations. Nature, 309(5966):338-340

Li Yanping, Jiang Shaoyong. 2013. Major cation/chlorine ratio and stable chlorine isotopic compositions of sediment interstitial water in the Brazos-Trinity Basin IV from the Gulf of Mexico (IODP 308). Journal of Asian Earth Sciences, 65:42-50

Li Lun, Lei Xinhua, Zhang Xin, et al. 2013. Gas hydrate and associated free gas in the Dongsha Area of the northern South China Sea. Marine and Petroleum Geology, 39(1):92-101

Liu Char-Shine, Huang Ian L, Teng Louis S. 1997. Structural features off southwestern Taiwan. Marine Geology, 137(3-4):305-319

Liu Changling, Meng Qingguo, He Xingliang, et al. 2015. Characterization of natural gas hydrate recovered from Pearl River Mouth basin in South China Sea. Marine and Petroleum Geology, 61:14-21

Liu Hailing, Yao Yongjian, Deng Hui. 2011. Geological and geophysical conditions for potential natural gas hydrate resources in southern South China Sea waters. Journal of Earth Science, 22(6):718-725

Magenheim A J, Spivack A J, Michael P J, et al. 1995. Chlorine stable isotope composition of the oceanic crust:Implications for Earth's distribution of chlorine. Earth and Planetary Science Letters, 131(3-4):427-432

Martin J B. 1999. Nonconservative behavior of Br^-/Cl^- ratios during alteration of volcaniclastic sediments. Geochimica et Cosmochimica Acta, 63(3-4):383-391

Martin J B, Gieskes J M, Torres M, et al. 1993. Bromine and iodine in Peru margin sediments and pore fluids:implications for fluid origins. Geochimica et Cosmochimica Acta, 57(18):4377-4389

McDonnell S L, Max M D, Cherkis N Z, et al. 2000. Tectono-sedimentary controls on the likelihood of gas hydrate occurrence near Taiwan. Marine and Petroleum Geology, 17(8):929-936

Mottl M J, Wheat C G, Fryer P, et al. 2004. Chemistry of springs across the Mariana forearc shows progressive devolatilization of the subducting plate. Geochimica et Cosmochimica Acta, 68(23):4915-4933

Oosting S E, Von Damm K L. 1996. Bromide/chloride fractionation in seafloor hydrothermal fluids from 9-10°N East Pacific Rise. Earth and Planetary Science Letters, 144(1-2):133-145

Pedersen T F, Price N B. 1980. The geochemistry of iodine and bromine in sediments of the Panama Basin. Journal of Marine Research, 38(3):397-411

Phillips F M, Bentley H W. 1987. Isotopic fractionation during ion filtration:I. Theory. Geochimica et Cosmochimica Acta, 51(3):683-695

Price N B, Calvert S E. 1977. The contrasting geochemical behaviours of iodine and bromine in recent sediments from the Namibian shelf. Geochimica et Cosmochimica Acta, 41(12):1769-1775

Price N B, Calvert S E, Jones P G W. 1970. The distribution of iodine and bromine in the sediments of the southwestern Barents Sea. Journal of Marine Research, 28(1):22-34

Ransom B, Spivack A J, Kastner M. 1995. Stable Cl isotopes in subduction-zone pore waters:implications for fluid-rock reactions and the cycling of chlorine. Geology, 23(8):715-718

Shyu C T, Chen Y J, Chiang S T, et al. 2006. Heat flow measurements over bottom simulating reflectors, offshore southwestern Taiwan. Terrestrial, Atmospheric and Oceanic Sciences, 17(4):845-869

Song Haibin, Geng Jianhong. 2000. Geophysical evidence of gas hydrates existence in Dongsha region north of South China Sea. EOS Transactions on AGU, 81(48):635

Spivack A J, Kastner M, Ransom B. 2002. Elemental and isotopic chloride geochemistry and fluid flow in the Nankai Trough. Geophysical Research Letters, 29(14):6-1-6-4

Wang Shuhong, Yan Wen, Song Haibin. 2006. Mapping the thickness of the gas hydrate stability zone in the South China Sea. Terrestrial Atmospheric and Oceanic Sciences, 17(4):815-828

Wei Wei, Kastner M, Spivack A. 2008. Chlorine stable isotopes and halogen concentrations in convergent margins with implications for the Cl isotopes cycle in the ocean. Earth and Planetary Science Letters, 266(1-2):90-104

Wu Nengyou, Wu Daidai, Ye Ying, et al. 2007. Hydrocarbon geochemical study of sediments from Dongsha area, Northeast South China Sea and their significances. Geological Research of South China Sea (in Chinese), (1):1-14

Wu S G, Zhang G X, Huang Y Y, et al. 2005. Gas hydrate occurrence on the continental slope of the South China Sea. Marine and Petroleum Geology, 22(3):403-412

Yan Pin, Deng Hui, Liu Hailing. 2006. The geological structure and prospect of gas hydrate over the Dongsha Slope, South China Sea. Terrestrial, Atmospheric and Oceanic Sciences, 17(4):645-658

Yang Tao, Jiang Shaoyong, Ge Lu, et al. 2010. Geochemical characteristics of pore water in shallow sediments from Shenhu area of South China Sea and their significance for gas hydrate occurrence. Chinese Science Bulletin, 55(8):752-760

Yang Tao, Jiang Shaoyong, Ge Lu, et al. 2013. Geochemistry of pore waters from HQ-1PC of the Qiongdongnan Basin, northern South China Sea, and its implications for gas hydrate exploration. Science China Earth Sciences, 56(4):521-529

Yang Tao, Jiang Shaoyong, Yang Jinghong, et al. 2008. Dissolved inorganic carbon (DIC) and its carbon isotopic composition in sediment pore waters from the Shenhu area, northern South China Sea. Journal of Oceanography, 64(2):303-310

Zhang Min, Frape S K, Love A J, et al. 2007a. Chlorine stable isotope studies of old groundwater, southwestern Great Artesian Basin, Australia. Applied Geochemistry, 22(3):557-574

Zhang Haiqi, Yang Shengxiong, Wu Nengyou, et al. 2007b. Successful and surprising results for China's first gas hydrate drilling expedition. In:Fire in the Ice:Methane Hydrate Newsletter. Pittsburgh, PA:National Technology Laboratory, US Department of Energy, 6-9

Zhang Guangxue, Yang Shengxiong, Zhang Ming, et al. 2014. GMGS2 expedition investigates rich and complex gas hydrate environment in the South China Sea. In:Fire in the Ice:Methane Hydrate Newsletter. Pittsburgh, PA:National Technology Laboratory, US Department of Energy, 14(1):1-5

Relative Articles

Supplements(0)

Cited By

Proportional views