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学科主题: Geosciences, Multidisciplinary
题名: The geochemical signatures of variable gas venting at gas hydrate sites
作者: Chen, DF ; Cathles, LM ; Roberts, HH
通讯作者: cathles@geology.cornell.edu
关键词: chemical signature ; variable gas venting ; vent and hydrate gas composition ; Bush Hill ; Gulf of Mexico
刊名: MARINE AND PETROLEUM GEOLOGY
发表日期: 2004
卷: 21, 期:3, 页:317-326
收录类别: sci
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
项目归属: 海洋地质
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.
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WOS记录号: WOS:000221723500003
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4806
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:
Chen, DF; Cathles, LM; Roberts, HH.The geochemical signatures of variable gas venting at gas hydrate sites,MARINE AND PETROLEUM GEOLOGY,2004,21(3):317-326
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