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Cobb Seamount
Cobb Seamount is a seamount (underwater volcano) and guyot located west of Gray's Harbor, Washington, United States. Cobb Seamount is one of the seamounts in the Cobb-Eickelberg Seamount chain, a chain of underwater volcanoes created by the Cobb hotspot that terminates near the coast of Alaska. It lies just west of the Cascadia subduction zone, and was discovered in 1950 by MV ''John N. Cobb''. By 1967, over of soundings and dozens of samples from the seamount had been collected.
Cobb Seamount is geologically interesting for its terraced, pinnacle structure, and its biological community. Like many other seamounts, Cobb Seamount acts as a biological center of diversity, and supports a dense oceanic ecosystem. Relatively convenient access and an interesting biological setting have made the seamount an object of several scientific cruises and dives.
== Geology ==
Cobb Seamount lies off the coast of Washington, in the -deep Cascadia Basin.〔 argon-argon dating of basalts retrieved from the volcano show that it is about 3.3 million years in age.〔 Cobb Seamount's slopes average 12° in grade, and are indented by four prominent terraces at various depths; this morphology is partly the result of sub-aerial exposure and wave erosion at sea level and partly due to volcanic processes far below wave base.〔Chaytor, J. D., R. A. Keller, R. A. Duncan, and R. P. Dziak (2007), Seamount morphology in the Bowie and Cobb hot spot trails, Gulf of Alaska, Geochem. Geophys. Geosyst., 8, Q09016, doi:10.1029/2007GC001712〕 The volcano's pinnacle is generally flat, and is defined by a pocketed area approximately by in size.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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