Abstract
The Fundão–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–Covilhã (BC) and Fáguas 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, Fráguas and CG. The PS and BC played a role as host rocks for the W and Sn mineralizations. The Fráguas 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° N and 155° 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.
Highlights
The production and emplacement of granitic magmas are well represented in orogenic belts, playing an important role in continental recycling and crustal growth
Fabric patterns can be precisely studied using the anisotropy of magnetic susceptibility (AMS) technique [7,8]
We study a small-scale intrusion whose emplacement was structurally controlled and spatially associated with W–Sn mineralizations—the Capinha granite located in the Fundão–Serra da Estrela–Capinha region
Summary
The production and emplacement of granitic magmas are well represented in orogenic belts, playing an important role in continental recycling and crustal growth. Granites are good markers of crustal kinematics and allow one to reconstruct the tectonic evolution of orogenic belts, e.g., [1,2,3]. Minerals 2020, 10, 557 the interpretation of the internal fabric patterns and microstructures developed during the successive stages of ascent—emplacement and post-emplacement together with the study of the geochemical evolution of granite intrusion. The use of AMS studies is crucial for granitic rocks since, at a macroscopic scale, the preferred orientation of iron-bearing minerals is weakly marked or absent [8,9,10]
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