Instalação de granitos pós-tectónicos controlada por falha Varisca profunda no Norte de Portugal

• Type: Article in International Scientific Journal
• Date: 2007

Authors

H. C. B. Martins (Author) FCUP; Helena Sant'Ovaia (Author) FCUP; F. Noronha (Author) FCUP

Journal

Title: Cadernos do Laboratorio Xeoloxico de Laxe

Vol. 32

Pages: 221-235

ISSN: 0213-4497

Publisher: Seminario de Estudos Galegos

Scientific classification

FOS: Natural sciences > Earth and related Environmental sciences

Other information

Abstract (EN): Multidisciplinary studies integrating petrography, geochemistry, anisotropy of magnetic susceptibility (AMS) studies and gravimetry were carried out on Vila Pouca de Aguiar (VPA) and Águas Frias-Chaves (AF) porphyritic biotite granite plutons which distance ca 20 km one from the other in independent outcrops. These mineralogical and geochemistry features led us to propose a model of mantle input followed by mantle crust interactions for the origin of these granites, although implying a major crustal contribution for AF pluton. The integration of different data suggests that both plutons have the same feeding zone aligned within PRVF and that both have the same structure which is related to late Variscan phases. The thicker shape for AF pluton than for VPA pluton is compatible with different deeps of PRVF sectors

Language: Portuguese

Type (Professor's evaluation): Scientific

Notes: Keywords: Variscan granites, post-orogenic, crystallochemistry, anisotropy of magnetic susceptibility (AMS), geometry, feeding zone, Variscan fault