Geochemistry of minerals from Li-bearing granitic aplite-pegmatite veins of Seg...

• Author(s): Antunes, I.M.H.R. ; Neiva, A.M.R. ; Silva, M.M.V.G.
• Date: 2007
• Persistent ID: http://hdl.handle.net/10400.11/763
• Origin: Repositório Científico do Instituto Politécnico de Castelo Branco
• Subject(s): Li-bearing; aplite-pegmatites; lipedolite; montebrasite; natromontebrasite; cassiterite; manganocolumbite
• Document Type: Conference Object
• Language: English

Description

Li-bearing granitic aplite-pegmatite veins containing muscovite, montebrasite, natromontebrasite, lepidolite, topaz,cassiterite and manganocolumbite crop out in Segura area. Primary lepidolite contains more F, Rb and less Al than primary muscovite. Primary natromontebrasite has more Na, F and less Li and OH than montebrasite. Cassiterite is zoned showing sequences of alternating parallel darker and lighter zones. The darker zones are strongly pleochroic, oscillatory zoned, show exsolved Manganocolumbite and have more Nb and Ta than the lighter zones. Manganocolumbite is oscillatory zoned.