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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)


Journal of Sedimentary Petrology
Vol. 61 (1991)No. 2. (March), Pages 291-295

The Bouma Division A and the Possible Duration of Turbidity Currents

J. R. L. Allen


Experimental data (Arnott and Hand 1989) combined with theoretical arguments suggest that the transition in a turbidite from division A to division B occurs at a deposition rate of unsupported grains of about 6.7 ^times 10-4 m s-1 in the case of fine-medium quartz sand. A second rate may be calculated from properties measured at the transition from division B to division C (Allen 1971b). These rates together permit an estimate to be made of the order of magnitude of the duration of deposition from a turbidity current. The calculated order of a few tens of minutes for a Mio-Pliocene turbidite described and interpreted hydraulically by Komar (1985) is in broad agreement with his independent estimate based on the sequenc of sedimentary structures.

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