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(Article of periodic en Anglais - 2014)

Document title

Diagenetic transformations and silcrete–calcrete intergrade duricrust formation in palaeo-estuary sediments

Authors(s) and Affiliation(s)

RINGROSE S. (1) ; CASSIDY L. (2) ; DISKIN S. (3) ; COETZEE S. (4) ; MATHESON W. (1) ; MACKAY A.W. (5) ; HARRIS C. (6) ;
(1) Independent Consultants, Maun, BOTSWANA
(2) Ecosurv Environmental Consultants, Gaborone, BOTSWANA
(3) HESAS, Univ. of Glamorgan, Clyntaff, ROYAUME-UNI
(4) Dept. of Physics, Univ. of Botswana, Gaborone, BOTSWANA
(5) ECRC, Dept. of Geography, Univ. College London, London, ROYAUME-UNI
(6) Dept. of Geoloical Sciences, Univ. of Cape Town, Rondebosch, AFRIQUE DU SUD

Abstract

The Boteti palaeo-estuary in northern Botswana is located where the endoreic Boteti river, an overflow from the regional Okavango river system, enters the Makgadikgadi pans. The aims are to help identify precursor conditions for the origin of microcrystalline silcrete–calcrete intergrade deposits while developing insight into pene-contemporaneous silica and calcite matrix formation. General precursor conditions require the presence of cyclical endoreic freshwater inflow into a saline pan. The pan should be deep enough to sustain a permanent watertable under climatic conditions sufficient to cause carbonate fractionation within the groundwater. Freshwater inflow into a saline pan drives the geochemistry of the system (from freshwater to saline, from neutral to high pH). The geochemistry is controlled by the periodicity of inflow relative to salinity levels of phreatic groundwater in the receptor saline pan

Source

Article of periodic

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

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

Millesime : 2014, vol. 39, no9 [pp. 1167-1187]

Bibliographic references : 2 p.

Collation : 12 fig., 9 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3516

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
Refdoc record number (ud4) : 28790439 : Permanent link - XML version
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