Abstract
The Trives granodiorite is a syntectonically emplaced pluton belonging to the great Manzaneda batholith, which has intruded into the gneisses of the Ollo de Sapo Formation (northern part of the Iberian Variscan belt) during Carboniferous times. Combined metamorphic, petrofabric, structural and anisotropy of magnetic susceptibility studies reveal that interactions between regional metamorphism, deformation and magmatism played the main role in strain partitioning in and around the emplacing Trives pluton. Low-dipping S–C structures carrying N140°E-trending stretching lineations exist in both the roof-pendants which contain sillimanite bearing gneisses and in the subjacent granodiorites which are located in the central areas of the Trives pluton, whereas subvertical shear zones but with the same stretching lineation orientations are found along the pluton margins. At deeper levels of the Trives granodiorite, there are fabrics which are related to the crystallization of magma at the emplacement level. In these rocks, magnetic foliations are mainly steeply dipping and magnetic lineations are N140°E-trending. The anisotropy of magnetic susceptibility data here is consistent with field-observed macroscopic structures. Samples showing solid-state deformation display magnetic foliations and lineations subparallel to C-planes and their macroscopic stretching lineations, respectively. The foliations and lineations of magmatic origin are characterized by lower degrees of anisotropy. Structural maps of magmatic and solid-state deformation structures suggest that the emplacement of the Trives pluton was controlled by D 3-deformational structures, N140°E-trending transcurrent shear zones and crustal detachments, which developed in response to a NE–SW compressional stress field.
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