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Determinação da gênese da cassiterita com base na sua composição química e inclusões minerais: ocorrências no sul e sudeste brasileiro

2008; Sociedade Brasileira de Geologia; Volume: 38; Issue: 2 Linguagem: Inglês

10.5327/rbg.v38i2.1374

2317-4889

Ronaldo Mello Pereira, Reiner Neumann, Ciro Alexandre Ávila, Cassiano Costa e Castro,

Clay minerals and soil interactions

Cassiterite crystals of different deposits from the southeastern and southern Brazil were studied by SEM-EDS techniques. The cassiterite samples are from Sao Joao Del Rei and Monte Belo-Capivara (pegmatites), Bairro Guarau (rare metal granite), Bairro dos Correas (greisen) and Itupeva, Inhandjara and Putuna (greisenized veins). The chemical composition of the crystals and their solid microinclusions were determined. The cassiterite from pegmatites are caracterized by Ta 2 O 5 > 1% and the predominance of niobo-tantalates microinclusions. The cassiterite from greisen and greisenized veins hosts ilmenorutile. Ilmenite, wolframite and bismute microinclusions can occur. The cassiterite from the rare metal granite hosts columbite, columbite-tantalite, ytriocolumbite, ilmenorutile, ilmenite, iron oxide (magnetite), hafnian zircon and wolframite