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Connexion

(Article of periodic en Anglais - 1998)

Document title

Dual mechanisms for the formation of fluvial silcretes in the distal reaches of the Okavango Delta fan, Botswana

Authors(s) and Affiliation(s)

SHAW P.A. ; NASH D.J. ;

Abstract

This paper describes the characteristics and possible origins of massive surface and sub-surface silcretes at Samedupe and Boro Junction, beyond the distal margin of the Okavango Delta. Morphological and petrological evidence from surface exposures and 3 sedimentary cores suggests that other modes of formation may also be applicable. A dual model of formation is proposed : surface silcretes are suggested to have developed by silica accumulation in seasonal pools remaining after the annual Okavango flood, whilst sub-surface horizons appear to have formed under conditions of varying pH associated with fluctuating groundwater levels beneath the channel floor

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 1998, vol. 23, no8 [pp. 705-714]

Bibliographic references : 49 ref.

Collation : Illustration ;

Language

Anglais

Localisation

Bureau de recherches géologiques et minières - Orléans

INIST-CNRS, Cote INIST : 17355

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 1998.
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