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International Conference on Gas Hydrates (ICGH) (6th : 2008)

COMPARISON OF CARBON ISOTOPIC COMPOSITIONS OF DISSOLVED INORGANIC CARBON (DIC) IN PORE WATERS IN TWO SITES OF THE SOUTH CHINA SEA AND SIGNIFICANCES FOR GAS HYDRATE OCCURENCE Yang, Tao; Jiang, Shao-Yong; Yang, Jing-Hong; Ge, Lu; Wu, Neng-You; Zhang, Guang-Xue; Liu, Jian

Abstract

The northern margin of South China Sea contains several favorable areas for occurrence of gas hydrate. In this study, we collected pore water samples in two piston cores (X-01 and D-01) from Xisha Trough and Dongsha area, respectively, and the concentrations of sulfate and carbon isotopic compositions of dissolved inorganic carbon (DIC) were measured. The results showed different geochemical characteristics in these two sites. The X-01 core shows relatively constant δ13C-DIC values and sulfate concentrations, which suggest that anaerobic methane oxidation (AMO) processes did not occur in this site. In contrast, very large variation in δ13C-DIC values and sulfate concentrations are revealed in D-01 core, and good linear correlations for sulfate gradients and δ13C-DIC values are observed. The calculated sulfate-methane interface (SMI) depth is 9.6 mbsf. These data indicate that an AMO process occurred in sediments with large methane flux from depth in the Dongsha area, which are comparable to other gas hydrate locations in the world oceans such as the Blake Ridge. We suggest that the Dongsha area is one of the most favorable targets for future gas hydrate exploration.

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Title
COMPARISON OF CARBON ISOTOPIC COMPOSITIONS OF DISSOLVED INORGANIC CARBON (DIC) IN PORE WATERS IN TWO SITES OF THE SOUTH CHINA SEA AND SIGNIFICANCES FOR GAS HYDRATE OCCURENCE
Creator
Yang, Tao; Jiang, Shao-Yong; Yang, Jing-Hong; Ge, Lu; Wu, Neng-You; Zhang, Guang-Xue; Liu, Jian
Contributor
University of British Columbia. Department of Chemical and Biological Engineering; International Conference on Gas Hydrates (6th : 2008 : Vancouver, B.C.)
Date Issued
2008-07
Description
The northern margin of South China Sea contains several favorable areas for occurrence of gas hydrate. In this study, we collected pore water samples in two piston cores (X-01 and D-01) from Xisha Trough and Dongsha area, respectively, and the concentrations of sulfate and carbon isotopic compositions of dissolved inorganic carbon (DIC) were measured. The results showed different geochemical characteristics in these two sites. The X-01 core shows relatively constant δ13C-DIC values and sulfate concentrations, which suggest that anaerobic methane oxidation (AMO) processes did not occur in this site. In contrast, very large variation in δ13C-DIC values and sulfate concentrations are revealed in D-01 core, and good linear correlations for sulfate gradients and δ13C-DIC values are observed. The calculated sulfate-methane interface (SMI) depth is 9.6 mbsf. These data indicate that an AMO process occurred in sediments with large methane flux from depth in the Dongsha area, which are comparable to other gas hydrate locations in the world oceans such as the Blake Ridge. We suggest that the Dongsha area is one of the most favorable targets for future gas hydrate exploration.
Extent
141423 bytes
Subject
Gas hydrates; Sulfate; Dongsha; Xisha Trough; Dissolved inorganic carbon
Geographic Location
Pratas Islands; Paracel Islands
Genre
Conference Paper
Type
Text
File Format
application/pdf
Language
eng
Date Available
2008-07-22
Provider
Vancouver : University of British Columbia Library
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International
DOI
10.14288/1.0040951
URI
http://hdl.handle.net/2429/1080
Affiliation
Non UBC
Citation
Yang, Tao; Jiang, Shao-Yong; Yang, Jing-Hong; Ge, Lu; Wu, Neng-You; Zhang, Guang-Xue; Liu, Jian. 2008. COMPARISON OF CARBON ISOTOPIC COMPOSITIONS OF DISSOLVED INORGANIC CARBON (DIC) IN PORE WATERS IN TWO SITES OF THE SOUTH CHINA SEA AND SIGNIFICANCES FOR GAS HYDRATE OCCURENCE. Proceedings of the 6th International Conference on Gas Hydrates (ICGH 2008), Vancouver, British Columbia, CANADA, July 6-10, 2008.
Peer Review Status
Unreviewed
Copyright Holder
Jiang, Shao-Yong
Rights URI
http://creativecommons.org/licenses/by-nc-nd/4.0/
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Attribution-NonCommercial-NoDerivatives 4.0 International