Produção Nacional
Stockscheider Quartzo-Moscovíticos e Pegmatíticos na Zona de Cúpula do Granitóide Ritápolis, Região de São João del Rei, Minas Gerais
2011; UNIVERSIDADE FEDERAL DO RIO DE JANEIRO; Volume: 34; Issue: 2 Linguagem: Inglês
ISSN
1982-3908
AutoresRonaldo Mello Pereira, Diana Rodrigues, Ciro Alexandre Ávila, Reiner Neumann,
Tópico(s)Geography and Environmental Studies
ResumoClusters of essentially quartz-muscovitic rocks were found in four areas of the Sao Joao del Rei Pegmatite Province in close association with pegmatites positioned parallel to the contact between the Ritapolis granitoid and the metavolcanic - metasedimentary rocks of the Rio das Mortes greenstone belt. The suite of accessory minerals associated to the quartz-muscovite and pegmatite stockscheider (columbite-tantalite, cassiterite, gahnite, zircon, xenotime and monazite) are similar to those determined for the pegmatites of the province. The mineralogy of inclusions (Pb-tantalite, microlite, Pb-microlite, U-microlite, Ba-microlite, Hf-rich zircon) in the Fe-columbite associated to the stockscheider is similar to those determined for the Fe-columbite of the more evolved pegmatites found in the province. The quartz-muscovite and pegmatite stockscheider are related to Ritapolis granitoid with is related to the other pegmatites of Sao Joao del Rei Pegmatite Province. The proposed mechanism for the formation of clusters of muscovite-quartz and pegmatitic stockscheider is the crystallization of pockets of tardi-magmatic and pos-magmatic hydrothermal - metasomatic fluids segregated from the parental granitic magma and injected into fractures parallel to the roof contact of the granitoid dome.
Referência(s)