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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 56 (1986)No. 5. (September), Pages 706-714

Internal-Wave Currents as a Mechanism to Account for Large Sand Previous HitWavesNext Hit in Navarinsky Canyon Previous HitHeadNext Hit, Bering Sea

H. A. Karl, D. A. Cacchione, P. R. Carlson

ABSTRACT

Sand Previous HitwavesNext Hit are found in the heads of four of five large submarine canyons that incise the northern continental margin of the Bering Sea. The sand Previous HitwavesNext Hit occur in a restricted depth zone of about 175-490 m. Those in Navarinsky Canyon, the area surveyed in most detail, are best developed in water depths of 300-375 m; they average 5 m in height and about 650 m in wavelength, with crests oriented subparallel to isobaths and almost perpendicular to the axes of the two main branches of the canyon.

We speculate that internal-wave currents are responsible for the sand Previous HitwavesNext Hit. Currents generated by internal Previous HitwavesNext Hit are a particularly attractive mechanism for at least three reasons: 1) the energy of the internal Previous HitwavesNext Hit could be amplified in the Previous HitheadNext Hit of Navarinsky Canyon, especially in the area of the sand wave field; 2) upslope boundary-Previous HitlayerNext Hit intensification of internal-wave currents might be sufficient to move the sediment composing the sand Previous HitwavesNext Hit; and 3) the wavelengths of higher-frequency internal Previous HitwavesNext Hit closely match the spacing of the sand Previous HitwavesNext Hit.

Although we based our assumptions on present-day conditions, we do not know if the sand Previous HitwavesNext Hit are active. Consequently, we do not discount the possibility that the sand Previous HitwavesNext Hit could have originated in the Pleistocene when Navarinsky Canyon headed in a shallow embayment that was receiving large quantities of sediment discharged by glacial meltwater streams. These conditions probably caused strong vertical density gradients in the coastal waters, which would have been more favorable than those today for the propagation of high-frequency internal Previous HitwavesTop.


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