Ground-Truthing 11- to 12-kHz side-scan sonar imagery in the Norwegian–Greenland Sea: Part II: Probable diapirs on the Bear Island fan slide valley margins and the Vøring Plateau |
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| Authors: | P R Vogt K Crane E Sundvor B O Hjelstuen J Gardner F Bowles G Cherkashev |
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| Institution: | (1) Code 7420, Naval Research Laboratory, 4555 Overlook Ave. SW, Washington, DC 20375-5320, USA, US;(2) Hunter College, CUNY, New York, USA, US;(3) Institute of Solid Earth Physics, University of Bergen, Bergen, Norway, NO;(4) A. S. Geoconsult, 5083 Oevre Ervik, Norway, NO;(5) VNIIOkeangeologiya, St. Petersburg, Russia, RU |
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| Abstract: | SeaMARC II (11- to 12-kHz) side-scan sonar revealed hundreds of small strong-backscatter spots, tens to 500?m in diameter, along the lips of the Bear Island fan slide valley. New bathymetry, deep-tow side-scan, deep-tow profiles, heatflow, and gravity cores were collected for ground-truth. These mounds are probably mud diapirs (or mud-built mounds) typically 10–75?m high, formed by glacial sediment mobilized by Late Pleistocene slide events. The mounds are arranged along NNE trending lines, suggesting control by intrasedimentary faults ca. 0.5–1 km apart. Diapirs examined on the Vøring Plateau exhibit WNW structural control. No heatflow anomaly was found in four stations on or next to diapirs in either area. |
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