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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
The Effects of Late Quaternary Sea-level Changes on the Rhone Slope Sedimentation (Northwestern Mediterranean), as Indicated by Seismic Stratigraphy
J. Torres, B. Savoye, P. Cochonat
ABSTRACT
These wedge-shaped seismic units are traced onto the slope in an intercanyon area between the Grand-Rhone and Petit-Rhone submarine canyons. Detailed analysis of the seismic facies shows that Upper Quaternary slope deposits also define sedimentary cycles. Each basic cycle is composed of a couplet of two different subunits. The lowest one is mostly transparent, has a gentle seaward-convergent geometry, and correlates with one complete perched lowstand wedge on the shelf. The upper subunit is well stratified, has a gentle seaward-divergent geometry, and correlates with an erosional unconformity on the shelf.
14C dating of the youngest slope cycle indicates that most
of the deposition on the slope occurred during low sea-level periods and
that the couplet of transparent and layered subunits are the result of
the interaction between eustatic sea level, sediment flux, and the geometry
of the continental shelf and slope. Stratified elongated wedges on the
slope are interpreted as deposition when the depocenter moves out from
the shelf to the upper slope and deep basin. This model is compared to
the Late Quaternary eustatic sea-level curve. Some cycles in this curve
seem to be absent on the slope or completely eroded on the shelf, indicating
that caution is necessary in deducing relative sea-level cycles from continental-margin
stratigraphy.
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