Gravimetric anomaly modelling of the post-tectonic granite pluton of Águas Frias – Chaves (Northern Portugal)

• Type: Article in International Scientific Journal
• Date: 2005

Authors

Helena Sant'Ovaia (Author) FCUP; F. Noronha (Author) FCUP

Journal

Title: Cadernos do Laboratorio Xeoloxico de Laxe

Vol. 30

Pages: 87-98

ISSN: 0213-4497

Publisher: Seminario de Estudos Galegos

Scientific classification

FOS: Natural sciences > Earth and related Environmental sciences

Other information

Abstract (EN): The aim of this study was to establish the three-dimensional shape of Águas Frias (AF) pluton using the interpretation of the gravity data and the modelling of the obtained residual anomaly. The relationship between the granites from AF pluton and Vila Pouca de Aguiar laccolith, which is located SSW from the former, is also discussed, in order to understand its emplacement mechanisms. AF pluton is a thick and deeply rooted body and its main volume is located under the outcrop of the two-mica granite. The AF granite was fed through a deep conduit located at the centre of the pluton, and then the biotitic granite and the two-mica granite are two different facies, which probably had the same feed zone. VPA and AF plutons, similar in mineralogical, chronological and magnetic features, are joined together in depth and were fed through feeding zones located within the NNE-SSW Penacova-Régua -Verin Fault (PRVF). The shapes from the two granite plutons are quite different: VPA pluton is laccolithic and AF pluton belongs to the wedge-floored pluton type. Gravity data also suggest that AF pluton is more rooted than VPA pluton. We consider that this difference can be related to the great depth of PRVF in the sector of Chaves

Language: English

Type (Professor's evaluation): Scientific

Notes: Key words: granite, post-tectonic, gravimetric, and modelling