Compressional granite-emplacement model; structural and magnetic study of the Trives Massif (NW Spain)

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doi: 10.1016/S0024-4937(98)00021-8
Authors:Román-Berdiel, T.; Aranguren, A.; Cuevas, J.; Tubía, J. M.
Author Affiliations:Primary:
Universidad del País Vasco, Departamento de Geodinámica, Bilbao, Spain
University of Birmingham, United Kingdom
Volume Title:Generation of granitic rocks and deep crustal processes
Volume Authors:Clemens, J. D., editor; Hutton, D. H.
Source:Lithos (Oslo), 44(1-2), p.37-52; 51st EUG symposium on Generation of granitic rocks and deep crustal processes, Strasbourg, France, Mar. 23-27, 1997, edited by J. D. Clemens and D. H. Hutton. Publisher: Elsevier, Amsterdam, International. ISSN: 0024-4937
Publication Date:1998
Note:In English. 48 refs.; illus., incl. sects., 1 table, geol. sketch maps
Summary: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 D3-deformational structures, N140°E-trending transcurrent shear zones and crustal detachments, which developed in response to a NE-SW compressional stress field. Abstract Copyright (1998) Elsevier, B.V.
Subjects:Anisotropy; Batholiths; Carboniferous; Compression tectonics; Decollement; Deformation; Emplacement; Faults; Foliation; Granites; Granodiorites; Igneous rocks; Intrusions; Lineation; Magmatism; Magnetic susceptibility; Metamorphism; Models; Orogeny; Paleomagnetism; Paleozoic; Petrography; Plutonic rocks; Plutons; Shear zones; Strain; Stress; Structural analysis; Tectonics; Variscan Orogeny; Europe; Galicia Spain; Iberian Mountains; Iberian Peninsula; Southern Europe; Spain; Manzaneda Batholith; Trives Massif
Coordinates:N414800 N434800 W0064500 W0092000
Abstract Numbers:99M/3091
Record ID:1999016318
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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