Geochemistry and isotopic data of the granitic rocks from Castelo Branco pluton...

• Author(s): Antunes, I.M.H.R. ; Neiva, A.M.R. ; Silva, M.M.V.G.
• Date: 2005
• Persistent ID: http://hdl.handle.net/10400.11/755
• Origin: Repositório Científico do Instituto Politécnico de Castelo Branco
• Subject(s): Pluton; geochemistry; isotopic data
• Document Type: Conference Object
• Language: English

Description

The Castelo Branco pluton is exposed over an area of 390 Km2 and consists of five late- to post-tectonic Hercynian granitic rocks, which intruded the Cambrian schist-metagraywacke complex. They are concentrically arranged. A medium- to fine-grained muscovite>biotite granite (G1) crops out in the pluton’s core and is surrounded by a medium- to fine-grained, slightly porphyritic biotite>muscovite granodiorite (G2), encircled by a medium- to coarse-grained porphyritic biotite>muscovite granodiorite (G3), grading into a medium- to coarse-grained porphyritic biotite = muscovite granite (G4). A coarse-grained muscovite>biotite granite (G5) forms only external parts of the pluton in the N and NE.