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The geochemical signatures of variable gas venting at gas hydrate sites
Chen, DF; Cathles, LM; Roberts, HH; cathles@geology.cornell.edu
2004
发表期刊MARINE AND PETROLEUM GEOLOGY
ISSN0264-8172
卷号21期号:3页码:317-326
摘要Diverse evidence suggests that gas-venting rates at sites of hydrate crystallization are variable in space and time, but the magnitude of these variations has been difficult to quantify. The hydrate crystallization model of Chen and Cathles [J. Geophys. Res. (Solid Earth) 108 (2003)] is used here to analyze 10 years of vent gas chemistry measurements at the Bush Hill hydrate mound and gas-venting site, Green Canyon 185, offshore Louisiana, Gulf of Mexico. The analysis suggests that, at any instant of time, gas vents at variable rates in different gas channels at the same site, and that the compositional differences in these vent gases are nearly as large as can be produced by hydrate crystallization. Almost two orders of magnitude differences in venting rate between individual gas channelways are suggested. Changes in the average vent gas composition over the last 10 years suggest the average venting rate varied by a factor of similar to2 or more over a few years. The average C-3 + C-4 composition of Bush Hill hydrates are leaner than could be crystallized from vent gases sampled over the last decade, indicating that the venting gas flux was slower in the past by a factor of similar to2. This is compatible with geologic generalizations that venting evolves from fast (mud volcano), to intermediate (hydrate crystallization), to slow (carbonate precipitation) if venting organized into more discrete vents with time. (C) 2004 Elsevier Ltd. All rights reserved.
部门归属Cornell Univ, Dept Earth & Atmospher Sci, Ithaca, NY 14853 USA; Guangzhou Inst Geochem, Key Lab Marginal Sea Geol, Guangzhou 510640, Peoples R China; Chinese Acad Sci, S China Sea Inst Oceanol, Guangzhou 510640, Peoples R China; Louisiana State Univ, Inst Coastal Studies, Baton Rouge, LA 70803 USA
关键词Chemical Signature Variable Gas Venting Vent And Hydrate Gas Composition Bush Hill Gulf Of Mexico
学科领域Geosciences, Multidisciplinary
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收录类别sci
资助项目海洋地质
WOS记录号WOS:000221723500003
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文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/4806
专题中科院边缘海地质重点实验室
通讯作者cathles@geology.cornell.edu
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Chen, DF,Cathles, LM,Roberts, HH,et al. The geochemical signatures of variable gas venting at gas hydrate sites[J]. MARINE AND PETROLEUM GEOLOGY,2004,21(3):317-326.
APA Chen, DF,Cathles, LM,Roberts, HH,&cathles@geology.cornell.edu.(2004).The geochemical signatures of variable gas venting at gas hydrate sites.MARINE AND PETROLEUM GEOLOGY,21(3),317-326.
MLA Chen, DF,et al."The geochemical signatures of variable gas venting at gas hydrate sites".MARINE AND PETROLEUM GEOLOGY 21.3(2004):317-326.
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