Title: Determinação da gênese da cassiterita com base na sua composição química e inclusões minerais: ocorrências no sul e sudeste brasileiro
Abstract:Cassiterite crystals of different deposits from the southeastern and southern Brazil were studied by SEM-EDS techniques. The cassiterite samples are from São João Del Rei and Monte Belo-Capivara (pegm...Cassiterite crystals of different deposits from the southeastern and southern Brazil were studied by SEM-EDS techniques. The cassiterite samples are from São João Del Rei and Monte Belo-Capivara (pegmatites), Bairro Guaraú (rare metal granite), Bairro dos Correas (greisen) and Itupeva, Inhandjara and Putunã (greisenized veins). The chemical composition of the crystals and their solid microinclusions were determined. The cassiterite from pegmatites are caracterized by Ta2O5>; 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.Read More