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Measurements of transience and downward fluid flow near episodic methane gas vents, Hydrate Ridge, Cascadia

Michael D. Tryon, Kevin M. Brown, Marta E. Torres, Anne M. Trehu, James McManus and Robert W. Collier
Measurements of transience and downward fluid flow near episodic methane gas vents, Hydrate Ridge, Cascadia
Geology (Boulder) (December 1999) 27 (12): 1075-1078

Abstract

Aqueous flux measurements within cold seep regions on northern Hydrate Ridge, Cascadia, indicate a high degree of variability, with extended periods of downflow and reversals of flow direction over periods of weeks to months. Local episodic venting of free methane gas was also observed. The instruments recorded similar changes in hydrologic flow patterns both on and off clam fields, the magnitude of the flow rates decreasing away from the clam field. The coincidence of episodic gas venting with nearby highly variable aqueous fluid flow suggests that they may be coupled. We propose that these observations are consistent with the action of a gas-driven pump that operates somewhat like a geyser. The hypothesis of gas-driven pumping of seawater through northern Hydrate Ridge has important ramifications for the mass fluxes through this region.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 27
Serial Issue: 12
Title: Measurements of transience and downward fluid flow near episodic methane gas vents, Hydrate Ridge, Cascadia
Affiliation: Scripps Institution of Oceanography, La Jolla, CA, United States
Pages: 1075-1078
Published: 199912
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 1999-070278
Categories: Oceanography
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
N44°10'00" - N44°45'00", W124°49'60" - W124°10'00"
Secondary Affiliation: Oregon State University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 199924
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