World Continent General Considerations For Africa Geological History. The African continent comprises five ancient Precambrian cratons, Kaapvaal, Zimbabwe, Tanzania, Congo, and West Africa. Which formed 2 billion to 3.6 billion years ago and have been stable since then; These cratons limited by the young crease bands formed between 2 billion and 300 million years ago. …
Africa Geological History
Africa Geological History the oldest rock comes from the arch age (4.6 to 2.5 billion years). In the so-called granite-gneiss-greenstone terrain of the Kaapvaal Craton in Zimbabwe. And the Congo. They form strip gneiss, several types of granite and well-preserved volcanic rocks. That show evidence of underwater extrusion (ie, discharge of molten rock material) and high-temperature formation. The Komati rock is a diagnosis of these volcanic rock sequences and only limited to Aeon Archean. The craton is stable at the ancient end by a good agreement of granite intrusive structures. Covered by clastic sediments, which contain important gold and uranium deposits (eg, the Witwatersrand scheme in South Africa).
World Continent General Considerations For Africa Geological History
The Proterozoic Eternal (250 million years ago, 541 million years ago) characterized by the form of several moving belts. Which were strong and deformed between cratons and long and narrow areas of deformed rocks? This may be for the means of cratons the tectonic plates. The oldest moving belt is in Archean rocks, such as the Limpopo belt that separates Kaapvaal from the Zimbabwe Craton. A younger belt formed throughout the thermal tectonic events. The continent is known as Eburnian (2.2 to 1.8 billion years ago). Which led to the Burmese combination of West Africa. The Ubendian combination of central and eastern Africa, and many rocks in Angola. Found younger bands from Kibaran thermotectonic event (from 1.2 billion to 950 million years) in eastern and southern Africa.
Sign of the end of the Precambrian main training venture band called Pan-African Interlude (making 950 550 million years). Which produces a double fold along the east coast of Mozambique Africa, Dharma and Kadan. The band extends from Namibia to the Congo and Zambia. Between Angola and Gabon, between Dahomey and Ghana and Algeria. The Akhagar belt, the Democratic Republic of the Congo with the Mauritanide from Senegal to Morocco.