Transverse infilling of the central Aleutian Trench by unconfined turbidity currents |
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| Authors: | Michael B Underwood |
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| Institution: | (1) Department of Geology, University of Missouri, 65211 Columbia, MO |
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| Abstract: | Holocene sand layers cored from the central Aleutian Trench are dominated by volcaniclastic debris, and the only likely source
is the central Aleutian volcanic arc. This creates something of an enigma because bathymetric obstructions seemingly prevent
direct delivery of sediment via transverse canyons or channels. Turbidity currents are funneled through submarine canyons
on the upper trench slope, but the flows become unconfined as they cross the midslope Aleutian Terrace. Evidently, the turbid
flows maintain high enough velocities to climb over the trench-slope break; acceleration down the lower trench slope then
allows forearc bypassing to occur without the aid of through-going channels. |
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