Pegmatites from Barroso-Alvão, Northern Portugal: Anatomy, mineralogy and mineral geochemistry

• Type: Article in International Scientific Journal
• Date: 2011

Authors

Martins, T (Author) Other; Lima, A (Author) FCUP

Journal

Title: Cadernos do Laboratorio Xeoloxico de Laxe

Pages: 177-206

ISSN: 0213-4497

Publisher: Seminario de Estudos Galegos

Indexing

ISI Web of Knowledge

Scopus - 0 Citations

Other information

Authenticus ID: P-005-4B8

Abstract (EN): The Barroso-Alvão pegmatite field is located in the Variscan belt, in the western part of the Iberian Peninsula, Northern Portugal and it is recognised for its numerous and varied aplitepegmatite intrusions. This is a rare-element aplite-pegmatite field with enrichment in Li, Sn, Nb>Ta, Rb, and P. Several hundreds of pegmatite bodies were identified and described in this field area intruding a variety of rock types including different metasedimentary, and granitic rocks. In this study we present the geology and mineralogy, and mineral geochemistry of different types of aplite-pegmatites bodies found at Barroso-Alvão. Their description was based on field observation, mineralogy, emplacement of the bodies and geochemical data. There were identified five different groups: intragranite pegmatites with major quartz, feldspar, muscovite, biotite, and minor tourmaline, beryl and garnet; barren pegmatites with quartz, feldspar, muscovite, and minor biotite, apatite, and beryl, among other accessories; spodumene pegmatites with spodumene, Nb-Ta minerals, and Mn-Fe-Li phosphates, along with other accessory mineral phases; petalite pegma-tites with petalite, cassiterite, Nb-Ta minerals, Mn-Fe-Li-Ca-Al-Ce-U phosphates; and lepidolite pegmatites with albite, lepidolite, cassiterite and Sr-Al phosphate minerals.

Language: English

Type (Professor's evaluation): Scientific