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Abstract

Botswana, in central southern Africa, is an area of high mineral potential, where conventional mapping of the basement geology is thwarted by the ubiquitous but generally thin cover of younger rocks, principally the sands of the Kalahari Desert. Some examples are taken from the regional gravity and aeromagnetic coverage of the country to demonstrate the exploration role of potential-field surveys in such large areas of concealed Precambrian metamorphic terrane. These examples include (a) the detection of unseen Archean greenstone belts by their gravity anomalies, (b) the delineation of a mineralized Proterozoic fold belt from its gravity and magnetic characteristics, (c) the discovery of a remarkable Mesozoic dike swarm from magnetic anomalies, and (d) the interpretation of a major linear feature some 600 km in length (evident in both gravity and magnetic data) as a suture between two crustal provinces, one of Archean age and the other of Proterozoic. Such interpretations of potential-field data are playing an important part in the strategy for mineral exploration in the country.

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