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Title

Feeding methane vents and gas hydrate deposits at south Hydrate Ridge

AuthorsTréhu, Anne M.; Flemings, Peter B.; Bangs, Nathan L.; Chevallier, Johanna; Gràcia, Eulàlia ; Johnson, Joel E.; Liu, C.-S.; Liu, Xiaoli; Riedel, Michael; Torres, Marta E.
Issue DateDec-2004
PublisherAmerican Geophysical Union
CitationGeophysical Research Letters 31(23): 1-4 (2004)
AbstractLog and core data document gas saturations as high as 90% in a coarse-grained turbidite sequence beneath the gas hydrate stability zone (GHSZ) at south Hydrate Ridge, in the Cascadia accretionary complex. The geometry of this gas-saturated bed is defined by a strong, negative-polarity reflection in 3D seismic data. Because of the gas buoyancy, gas pressure equals or exceeds the overburden stress immediately beneath the GHSZ at the summit. We conclude that gas is focused into the coarse-grained sequence from a large volume of the accretionary complex and is trapped until high gas pressure forces the gas to migrate through the GHSZ to seafloor vents. This focused flow provides methane to the GHSZ in excess of its proportion in gas hydrate, thus providing a mechanism to explain the observed coexistence of massive gas hydrate, saline pore water and free gas near the summit
Description4 pages, 3 figures, 1 table, supporting information http://onlinelibrary.wiley.com/doi/10.1029/2004GL021286/suppinfo
Publisher version (URL)http://dx.doi.org/10.1029/2004GL021286
URIhttp://hdl.handle.net/10261/75996
DOI10.1029/2004GL021286
Identifiersdoi: 10.1029/2004GL021286
issn: 0094-8276
e-issn: 1944-8007
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