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The Sao Francisco shield is one of the major cratonic units forming the backbone of the South American continent. The Quadrilatero Ferrifero area, in the south of the shield, is underlain by three major units: granitic-gneissic terrains with a minimum age of 2860 Ma; the Rio das Velhas greenstone belt, emplaced at 2772-2780 Ma; and the Minas Supergroup-Itacolomi Group Paleoproterozoic sedimentary...
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