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The São Francisco Craton is an ancient craton located in the eastern part of South America. The craton outcrops in the Brazilian states of Minas Gerais and Bahia. It includes a number of different blocks of the Archean basement, separated by orogenic belts. The belts are characterized by sedimentary basins and passive continental margins containing granite intrusions. The Paleoproterozoic (about 2.5 to 2.0 Ga) was the source of orogenic belts and the current configuration of the craton. The São Francisco Craton around 1.0 Ga ago was located in the south of the supercontinent Rodinia and after the fragmentation of Rodinia in the late Proterozoic (700 Ma) became a member of the supercontinent Gondwana until its fragmentation in the Jurassic (about 180 Ma). The subsequent opening of the Atlantic Ocean left South Africa in the Congo Craton and the São Francisco in South America. The ancient Paleoproterozoic orogenic belts of the São Francisco Craton contain many economically important minerals, particularly those containing iron and gold, and are a major source of income for the mining industry in Brazil. == References == * * * * 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sao Francisco Craton」の詳細全文を読む スポンサード リンク
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