Geochemical Signature and Magnetic Fabric of Capinha Massif (Fundao, Central Portugal): Genesis, Emplacement and Relation with W-Sn Mineralizations

• Type: Article in International Scientific Journal
• Date: 2020

Authors

Goncalves, A (Author) Other; Sant'Ovaia, H (Author) FCUP; Noronha, F (Author) FCUP

Journal

Title: Minerals

Vol. 10

Pages: 1-43

Publisher: MDPI

Indexing

ISI Web of Knowledge - 5 Citations

Scopus - 5 Citations

Other information

Authenticus ID: P-00S-B2C

DOI: 10.3390/min10060557

Abstract (EN): The Fundao-Serra da Estrela-Capinha (FSEC) region is characterized by peraluminous to metaluminous Variscan granites intrusive in a complex and thick metasedimentary sequence. This work seeks to characterize the Capinha granite (CG), understand its spatial and genetic relationship with the host Peroviseu-Seia (PS), Belmonte-Covilha (BC) and Faguas granites, and evaluate its metallogenic potential. To achieve these goals, a multidisciplinary approach was undertaken, including field work and identification of the petrography and microstructures, whole rock geochemistry and anisotropy of magnetic susceptibility. Four distinct and independent differentiation trends were identified in the granites, namely, PS, BC, Fraguas and CG. The PS and BC played a role as host rocks for the W and Sn mineralizations. The Fraguas granite is anomalous in Sn and spatially related to the Sn-Li mineralizations, while the CG is anomalous in W and spatially related to W-Sn mineralizations. The post-tectonic CG is a peraluminous ilmenite-type whose ascent and emplacement were tectonically controlled. The Capinha magma used the intersection between the 25 degrees N and 155 degrees N strike-slip crustal scale faults for passive ascent and emplacement during the late-Variscan extensional phases. The magnetic fabric was drawn using an asymmetric tongue-shaped laccolith for CG. CG experienced two brittle deformation stages that marked the maximum compressive rotation from NE-SW to NNW-SSE.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 44