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TitleFine-scale heat flow, shallow heat sources, and decoupled circulation systems at two sea-floor hydrothermal sites, Middle Valley, northern Juan de Fuca ridge
AuthorStein, J S; Fisher, A T; Langseth, M; Jin, W; Iturrino, G; Davis, E
SourceGeology vol. 26, no. 12, 1998 p. 1115-1118,<1115:fshfsh>;2 (Open Access)
Alt SeriesGeological Survey of Canada, Contribution Series 1998235
PublisherGeological Society of America
Mediapaper; on-line; digital
File formatpdf
ProvinceWestern offshore region
AreaJuan de Fuca Ridge; Middle Valley
Lat/Long WENS-128.5000 -128.0000 49.0000 48.0000
Subjectshydrogeology; marine geology; submarine hydrothermal vents; heat flow; rifts; thermal regimes; thermal analyses; water circulation patterns; hydrothermal systems; temperature; Juan de Fuca Plate; Dead Dog hydrothermal zone; Bent Hill hydrothermal zone
AbstractFine-scale heat-flow patterns at two areas of active venting in Middle Valley, a sedimented rift on the northern Juan de Fuca Ridge, provide thermal evidence of shallow hydrothermal reservoirs beneath the vent fields. The extreme variability of heat flow is explained by conductive heating immediately adjacent to vents and shallow circulation within sediments above the reservoir. This secondary circulation is hydrologically separated from the deeper system feeding the vents by a shallow conductive lid within the sediments. A similar separation of shallow and deep circulation may also occur at sediment-free ridge-crest hydrothermal environments.