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The AAPG/Datapages Combined Publications Database
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Abstract
Paull, C. K., and W. Ussler III,
DOI:10.1306/13201110M893348
2009 by The American Association of Petroleum Geologists.
No Evidence for Enhanced Methane Flux from the Blake Ridge Depression
Charles K. Paull,1 William Ussler III2
1Monterey Bay Aquarium Research Institute, California, U.S.A.
2Monterey Bay Aquarium Research Institute, California, U.S.A.
ACKNOWLEDGMENTS
The Department of Energy, U.S. Geological Survey, National Science Foundation (OCE-9910418), and the David and Lucile Packard Foundation provided support for this work. The crew of the R/V Cape Hatteras is gratefully acknowledged.
ABSTRACT
Piston cores were collected from the floor, flanks, and background sediments associated with the Blake Ridge Depression (BRD) off the east coast of the United States to determine if this area is a gas-venting site. The hypothesis was that if the depression is associated with focused methane flux, authigenic carbonate mineralization, indicative of methane-related diagenesis and/or steeper pore-water sulfate gradients, should occur within the feature. Sulfate gradients are sensitive to elevated pore-water methane concentrations and anaerobic methane oxidation. Compared with surrounding background sediments, neither steep sulfate gradients nor authigenic carbonates were observed within the cores collected from the interior of the BRD. The hypothesis that the Black Ridge Depression is or has been a site of enhanced methane venting is not supported by these geochemical observations.
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