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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 63 (1993)No. 5. (September), Pages 828-834

Flood Transport and Deposition of Tracer Heavy Minerals in a Gravel-Bed Meander Bend Channel

Johan Hattingh (1), Izak C. Rust (2)

ABSTRACT

Heavy-mineral transport and deposition in a gravel-bed river was studied by placing 40,000 kg of heavy minerals at the upstream end of a meander-bend channel prior to a flood. During a subsequent flood, redeposition of the tracer heavy minerals was limited to the meander-bend part of the channel. High concentrations of heavy minerals formed on the point-bar face and in particular downstream of the point-bar apex. Zones of flow separation in the lee of boulders and cobbles are favorable sites for heavy-mineral concentration. Low heavy-mineral concentrations were formed in the thalweg and on the outer bank of the meander bend despite high bed roughness there. At the downstream end of the meander bend a swamp effectively filtered out heavy minerals from suspension.


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