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| Detailed Reference Information |
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Gardner, J.V., Dean, W.E. and Blakely, R.J. (1984). Shimada Seamount; an example of Recent mid-plate volcanism. Geological Society of America, Bulletin 95(7): 855-862. |
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Shimada Seamount is an isolated volcanic feature located between the Clipperton and Clarion Fracture Zones approximately 1,150 km west of the East Pacific Rise and approximately 600 km west of the inactive spreading center represented by the Mathematician Seamounts. It rises approximately 3,900 m above the surrounding sea floor to within 50 m of present-day sea level. The area of Shimada Seamount should be volcanically dormant, because it is far from an active spreading center and is located on oceanic crust of early Miocene age. Nevertheless, evidence was found that Shimada Seamount has formed geologically recently: seismic-reflection profiles indicate that virtually no sediment has accumulated on the summit or flanks of the seamount; television, still-camera, and dredge-haul data indicate that a platform near the summit at a water depth of approximately 180 m is a carbonate build-up; glassy pillow basalt showing little devitrification and lacking manganese encrustations was dredged from the seamount below the algal reefs (500-750 m).--Modified journal abstract. |
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Keywords
basalts; cores; crust; East Pacific; geophysical methods;, geophysical surveys; igneous rocks; intraplate tectonics; magnetic, anomalies; North American Pacific; North Pacific; Northeast, Pacific; ocean floors; oceanic crust; oceanography; Pacific Ocean;, Pacific Plate; plate tectonics; reflection methods; seamounts;, seismic methods; Shimada Seamount; surveys; tectonophysics;, volcanic rocks; volcanism; volcanology, 18 Solid-earth geophysics; 07 Oceanography |
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Publisher
The Geological Society of America
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Boulder, CO 80301
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