Physics – Geophysics
Scientific paper
Feb 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3204609w&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 4, CiteID L04609
Physics
Geophysics
7
Marine Geology And Geophysics: Gas And Hydrate Systems, Marine Geology And Geophysics: Marine Hydrogeology, Marine Geology And Geophysics: Ocean Drilling, Marine Geology And Geophysics: Marine Sediments: Processes And Transport, Physical Properties Of Rocks: Permeability And Porosity
Scientific paper
A study of cold thermal anomalies identified in continuous down-core records of thermal structure acquired by an infrared (IR) camera during Ocean Drilling Program (ODP) Leg 204 to southern Hydrate Ridge, is combined with core-based observations of structure and lithology, to present new insights into the influence of lithology on hydrate distribution in an accretionary margin. Hydrate distribution is spatially associated with <0.5 cm-thick, laterally discontinuous sand horizons that compose <1% of the sedimentary section at all sites. Proximity to the fractured ridge crest determines the extent to which individual sand horizons host hydrate, with 70% of the horizons hosting hydrate at the crest and only 29% in the basin. This trend is consistent with focused up-dip migration of fluids along permeable lithologic conduits, and shows that lateral flow may be as important as vertical diffusion and fracture flow in determining gas hydrate distribution at Hydrate Ridge.
Brown Kevin M.
Long Philip E.
Weinberger Jill L.
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