Reposicionamentos petrogen??ticos do W e Mo desde o Sil??rico at?? ?? remobiliz...

• Author(s): Dias, Patr??cia Sofia Alves ; Gomes, C. Leal
• Date: 2010
• Persistent ID: http://hdl.handle.net/1822/30034
• Origin: RepositóriUM - Universidade do Minho
• Subject(s): Scheelite; Volframite; Tungstenomolibdenite; Processos singen??ticos; Remobiliza????o; Wolframite; W-molybdenite; Syngenetic processes; Remobilization
• Document Type: Article
• Language: Portuguese

Description

"VIII Congresso Nacional de Geologia" A mineraliza????o tungst??fera principal detectada na regi??o da Serra de Arga inclui scheelite e volframite e tamb??m raramente tungstenomolibdenite. Esta encontra-se hospedada em suportes litol??gicos diversos: rochas calcossilicatadas, anfibolitos, segrega????es de leucossoma e veios de quartzo em cisalhamentos tardi-D3. A mineraliza????o tungst??fera prim??ria, possivelmente singen??tica e ortomagm??tica e as remobiliza????es posteriores foram estudadas em microscopia ??ptica e microssonda, reconhecendo-se tend??ncias de sucess??o paragen??tica e qu??mica relacionadas com varia????es na fO2 dos meios de deposi????o. The main W mineralization detected in Serra de Arga includes scheelite and wolframite and also rarely W-molybdenite. It is hosted in various lithologies: calcsilicate rocks, amphibolites, leucosomes and quartz veins in late-D3 shear zones. Primary W mineralization, possibly syngenetic to orthomagmatic, and later remobilizations were studied in optical microscope and microprobe, allowing the recognition of trends of paragenetic succession and chemical variation, related to fO2 changes.