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Iron deposits of the Congonhas District, Minas Gerais, Brazil

1953; Volume: 48; Issue: 8 Linguagem: Inglês

10.2113/gsecongeo.48.8.639

1554-0774

Philip White Guild,

Geological and Geochemical Analysis

Massive specular hematite ores of the Congonhas district, central Minas Gerais, Brazil, are believed to have been formed by metasomatic replacement of itabirite (quartz-iron oxide rock) and associated dolomite in the central group of the Precambrian Minas series. It is suggested that heated solutions of unknown source and character were introduced along faults and replaced silica and carbonate by hematite in structurally and chemically favorable portions of the itabirite.