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Thermogenic vent gas and gas hydrate in the Gulf of Mexico slope; is gas hydrate decomposition significant?

Roger Sassen, Stephen T. Sweet, Alexei V. Milkov, Debra A. DeFreitas and Mahlon C. Kennicutt
Thermogenic vent gas and gas hydrate in the Gulf of Mexico slope; is gas hydrate decomposition significant?
Geology (Boulder) (February 2001) 29 (2): 107-110

Abstract

Samples of vent gas and gas hydrate on the Gulf of Mexico slope were collected by research submersible ( approximately 540 m water depth) and by piston coring ( approximately 1060-1070 m water depth). Although gas hydrate that crops out is transiently unstable, the larger volume of structure II gas hydrate in the gulf is stable or increasing in volume because gas from the subsurface petroleum system is venting prolifically within the gas hydrate stability zone. Vent gas from gas hydrate shows no meaningful molecular evidence of gas hydrate decomposition. Gas hydrate fabrics, mainly vein fillings, are typical of ongoing crystallization. Once crystallized, most hydrocarbons are protected from bacteria within the crystal lattice of gas hydrate. A leaky petroleum system is proposed to be the main source of thermogenic greenhouse gases in the central gulf. Stable gas hydrate sequesters large volumes of greenhouse gases, suggesting that gas hydrate may not be a significant factor in models of climate change at present.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 29
Serial Issue: 2
Title: Thermogenic vent gas and gas hydrate in the Gulf of Mexico slope; is gas hydrate decomposition significant?
Affiliation: Texas A&M University, Geochemical and Environmental Research Group, College Station, TX, United States
Pages: 107-110
Published: 200102
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 24
Accession Number: 2001-013802
Categories: Oceanography
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch map
N27°30'00" - N28°00'00", W91°00'00" - W91°00'00"
N28°00'00" - N28°19'60", W89°00'00" - W89°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200105
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