By Thomas Schlüter
Here's the recent variation of the 1st try to summarize the geology of Africa by way of featuring it in an atlas and to synthesize the stratigraphy, tectonics, fiscal geology, geohazards and geosites of every nation and territory of the continent. moreover, the digitized geological maps are correlated and harmonized in line with the present stratigraphic timetable. The atlas goals to give a contribution to capability development in African Earth Sciences and to assist the initiation of analysis and permit the success of financial possibilities by way of offering a database of easy geological historical past info.
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Sougy, J. – C. R. Acad. , Paris 272, 800–803; Paris. Botswana General Area: 581,730 km2 Population: 1,856,000 ( 2007 estimate) Summary of Geology Rocks of A rchean age predominate i n t he east a nd southeast o f B otswana. P roterozoic o rogenic b elts, mostly c oncealed b eneath K aroo ro cks, young progressively westwards away from the Archean rocks. Karoo s trata d eposited w ithin t he Ka lahari B asin underlie c entral B otswana, w hereas i n t he n orth and northwest rocks of Meso- a nd Neoproterozoic age occur.
Kaolin was mined on a small scale in the early 1970᾽s from deposits in Bengo, Huila, Huambo, Bie and Uige provinces. Despite the abundance of limestones, sands, sandstones and clays in Angola᾽s marine coastal basins, their production has been low. Angola Geohazards An inventory has not yet been made. Mining activities have caused pollution of aquifers and on the surface. Environmental p roblems app ly f or t he offshore exploration of hydrocarbons. Geosites An inventory has not yet been made, but t his large country offers many sites of scenic beauty, which are currently under consideration (Fig.
2 Orogenic Activity The final t hroes o f t he N eoproterozoic o rogenesis persisted into the lower Paleozoic until about 425 Ma. Anorogenic g ranitoid ma gmatism a nd u plift were widespread in the mobile belts. Low-grade tectonothermal activity was mostly localized, although epithermal alteration was ubiquitous in the orogens, facilitating subsequent weathering processes. Renewed major orogenesis in well-defined fold-thrust belts was confined to the southernmost tip and northwestern coastal zone of Africa.