Show simple item record Gobagoba, L. Meyer, T. Ringrose, S. Kampunzu, A.B. Coetzee, S. 2011-12-02T08:55:23Z 2011-12-02T08:55:23Z 2005
dc.identifier.citation Gobagoba, L. et al (2005) Calcrete mapping and palaeo-environmets in the Qangwa area, Northwest Botswana, Botswana Notes and Records, Vol. 37, pp. 264-279 en_US
dc.description.abstract Calcrete deposits of the Qangwa area, northwestern Botswana are evaluated on the basis of satellite imagery and sedimentological analysis. Enhanced Thematic Mapper imagery interpretation combined with field evidence has led to identification of the calcrete. This project aims at making a detailed surficial geology map accompanied by a report as a step in expanding the knowledge of calcretes. It also attempts to develop an understanding of the relationship in the timing of the late Quaternary wetter and drier phases. A digital map using GIS and remote sensing applications was developed from both analysed data and fieldwork. Data analysis revealed five types of calcretes and a calcareous soil. Hardpan calcrete along with brecciated and conglomeratic calcrete dominate the interfluves and are believed to predate the formation of nodular and honeycomb calcrete which occupy the valleys. The older hardpan associated types may have developed following regional wet/warm periods the last of which has been dated elsewhere as occurring c. 120,000. The younger valley calcretes show different mechanisms of formation, and are believed to have been developed following incision and palaeo-lake establishment, c. 25,000 years ago. en_US
dc.language.iso en en_US
dc.publisher Botswana Society en_US
dc.subject calcrete deposits en_US
dc.subject sedimentological analysis en_US
dc.subject calcrete mapping en_US
dc.subject Northwest Botswana en_US
dc.title Calcrete mapping and palaeo-envoronments in the Qangwa area, Northwest Botswana en_US
dc.type Published Article en_US en_US

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