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 ›› 2005, Vol. 19 ›› Issue (1): 45-54.

• Engineering Geology and Environmental Geology • Previous Articles Next Articles

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

JIANG Shao-yong^1,2, YANG Tao^1,2, XUE Zi-chen^1,2, YANG Jing-hong^1,2, LING Hong-fei^1,2, WU Neng-you³, HUANG Yong-yang³, LIU Jian³, CHEN Dao-hua²,³

1 State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing ,Jiangsu210093, China;
2Center for Marine Geochemistry Research, Nanjing University, Nanjing ,Jiangsu210093, China;
3Guangzhou Marine Geological Survey, Guangzhou,Guangdong510760, China

Received:2004-11-15 Revised:2005-01-10 Online:2005-01-20 Published:2005-01-20

Abstract

Abstract:

This paper reports Cl^- and SO₄^2- anion concentrations in pore waters from marine sediments in the north margin of the South China Sea. Our results show that several sites in the north margin of the South China Sea display high chlorinity in pore waters. It is suggested that the salt exclusion effect during hydrate formation will cause a salinity increase of pore waters in the hydrate roof zone and shallow subseafloor sediments due to fluid diffusion. Therefore those sites with elevated chlorinity in the South China Sea deserve a further examination for gas hydrate occurrence.Analysis of sulfate concentrations in pore waters reveals a steep sulfate gradient decrease with depths, and the calculated SMI values are around 10 m, which is similar to the SMI values of those well-known gas hydrate occurrences as revealed by ODP Leg 164 and ODP Leg 204 drilling samples. The data suggest that those sites hold a great potential for gas hydrate presence at depths and warranty a further detailed exploration.

Key words: chlorine, sulfate, pore water, gas hydrate, the South China Sea

CLC Number:

P736.4
P74

JIANG Shao-yong,YANG Tao,XUE Zi-chen,YANG Jing-hong,LING Hong-fei,WU Neng-you. 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[J]. Geoscience, 2005, 19(1): 45-54.

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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

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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

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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