Hercynian late-post-tectonic granitic rocks from the Fornos de Algodres area (northern central Portugal)

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doi: 10.1016/S0024-4937(98)00019-X
Authors:Azevedo, M. R.; Nolan, J.
Author Affiliations:Primary:
Universidade de Aveiro, Departamento de Geociências, Aveiro, Portugal
University of Birmingham, United Kingdom
Imperial College, 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.1-20; 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. 77 refs.; illus., incl. 3 tables, geol. sketch maps
Summary:The Fornos de Algodres Complex (FAC) comprises several intrusions of late-post-tectonic Hercynian granitic rocks ranging in composition from hornblende granodiorites and quartz monzodiorites, through coarse porphyritic biotite granites and two-mica granites (coarse-, medium- and fine-grained), to muscovite-rich leucogranites. Field and regional constraints show that the emplacement of this large, composite, batholithic complex post-dates the main Variscan regional deformation phases (D1+D2+D3) and associated metamorphic events. Field, petrographic and geochemical data suggest a strong genetic relationship between most of the members of the FAC. However, their Rb-Sr and Sm-Nd isotopic signatures appear to rule out any genetic process involving a single homogeneous source and/or closed-system fractional crystallization of the same parental magma. A model involving hybridization of mantle-derived basaltic liquids with crustal anatectic melts followed by further contamination and fractional crystallization is proposed to explain the isotopic and geochemical variation trends defined by the FAC granitic rocks. Abstract Copyright (1998) Elsevier, B.V.
Subsections:Igneous petrology
Subjects:Alkaline earth metals; Batholiths; Chemical composition; Crust; Deformation; Emplacement; Fractional crystallization; Genesis; Geochemistry; Granites; Igneous rocks; Intrusions; Isotope ratios; Isotopes; Magmas; Major elements; Mantle; Melts; Metals; Metamorphism; Nd-144/Nd-143; Neodymium; Orogeny; Petrography; Plutonic rocks; Rare earths; Sr-87/Sr-86; Stable isotopes; Strontium; Tectonics; Trace elements; Variscan Orogeny; Europe; Iberian Peninsula; Portugal; Southern Europe; Fornos de Algordres Complex
Coordinates:N410000 N420000 W0060000 W0080000
Abstract Numbers:99M/3147
Record ID:1999016316
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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