Sio Guyot: A complex volcanic edifice in the western Mid-Pacific Mountains |
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Authors: | Kenji Nemoto Loren W Kroenke |
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Institution: | (1) Hawaii Institute of Geophysics, University of Hawaii, 96822 Honolulu, HI;(2) Present address: Department of Marine Resources, Faculty of Marine Science and Technology, Tokai University, 1000-Orido, 424 Shimizu, Shizuoka, Japan |
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Abstract: | Sio Guyot, in the westernmost edge of the Mid-Pacific Mountains, is a large, complex volcanic edifice rising to more than 1200 m below sea level. The summit is divided into two flat-topped areas by a WNW-trending sediment-filled trough. Seismic reflection profiles reveal three acoustic units: an upper transparent layer (pelagic cap), a lower opaque layer (reef- and lagoon-derived sediments), and an acoustic (volcanic) basement. Free-air gravity anomalies indicate three eruptive centers or conduits within the main edifice, which apparently was constructed during late Cretaceous time on a broad basement swell or plateau that today is more than 3400 m below sea level (1500 m above regional abyssal depths). |
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