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学科主题: Geochemistry & Geophysics
题名: A kinetic model for the methane hydrate precipitated from venting gas at cold seep sites at Hydrate Ridge, Cascadia margin, Oregon
作者: [Cao, Yuncheng ; Chen, Duofu] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510640, Peoples R China ; [Cao, Yuncheng ; Chen, Duofu] Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Marginal Sea Geol, Guangzhou 510640, Peoples R China ; [Cathles, Lawrence M.] Cornell Univ, Dept Earth & Atmospher Sci, Ithaca, NY 14853 USA
通讯作者: cdf@gig.ac.cn ; lmc19@cornell.edu
关键词: gas hydrate ; kinetic model ; venting gas ; Hydrate Ridge
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
发表日期: 2013
卷: 118, 期:9, 页:4669-4681
部门归属: 海洋地质
资助者: This study used data provided by the Ocean Drilling Program. Funding for this study was supported by the Chinese Academy of Sciences (grant KZCX2-YW-GJ03), Chinese National Science Foundation (grant 91228206), GIGCAS 135 Program (grant Y234021001).
摘要: We develop a kinetic model for hydrate crystallization from methane gas venting through shallow sediments at Hydrate Ridge on the Cascadia margin of Oregon that predicts how pore water chlorinity, temperature, and crystallized hydrate evolve after the onset of steady venting. Predictions are compared to observations at Ocean Drilling Program Site 1249. In the preferred model, calculated gas hydrate saturation and chloride concentrations reach those observed at depths less than 20m below seafloor (bsf) under the southern summit of Hydrate Ridge in similar to 650years, and the vertical water flux must be less than 50kg/m(2)/yr. Hydrate accumulates more slowly between 20m bsf and the base of the hydrate stability zone where there is no free gas, accumulating to observed levels of a few volume percent of hydrate in 10(5) to 10(6)years, depending on the water flux that is assumed through this zone. This dichotomy means that the presently observed gas venting must have been diverted to this area similar to 650years ago, or be episodic and infrequent. If the gas venting for the last 650years has been as observed today, the latent heat of hydrate precipitation in the upper 20m of sediments would have caused the temperature to increase similar to 0.8 degrees C at similar to 20m bsf and similar to 0.2 degrees C at similar to 100m bsf. This would have caused a similar to 5m rise in the elevation of the base of hydrate stability zone, and decreased the rate of hydrate crystallization from 1.5kg CH4/m(2)/yr 650years ago to 0.7kg CH4/m(2)/yr today.
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000325553000001
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/11118
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Recommended Citation:
[Cao, Yuncheng; Chen, Duofu] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510640, Peoples R China; [Cao, Yuncheng; Chen, Duofu] Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Marginal Sea Geol, Guangzhou 510640, Peoples R China; [Cathles, Lawrence M.] Cornell Univ, Dept Earth & Atmospher Sci, Ithaca, NY 14853 USA.A kinetic model for the methane hydrate precipitated from venting gas at cold seep sites at Hydrate Ridge, Cascadia margin, Oregon,JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2013,118(9):4669-4681
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