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http://hdl.handle.net/2183/5875 Granitoides cuarzodioríticos y granodioríticos en el sector Usagre-Llerena (provincia de Badajoz, SW Macizo Ibérico)
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Chacón, J.
Martí Rubi, J. A.
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Cadernos do Laboratorio Xeolóxico de Laxe, 1984, 7: 25-53 ISBN: 84-7492-204-6
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[Resumen] Se describen varios pequeños cuerpos granitoides ubicados en las proximidades del cuerpo plutónico cuarzodiorítico de Ahillones en la región centroseptentrional de la Zona de Ossa Morena. Se componen de rocas de la serie tonalita-granodioritagranito con biotita y/o hornblenda, atravesados por frecuentes diques de pórfidos ácidos y orlados, ocasionalmente, por microgabros. Estos cuerpos están afectados por las deformaciones de cizalla frágil y dúctil tardihercínicas y son claramente posteriores a la fase 1 de plegamiento y metamorfismo. Intruye en rocas epimetamórficas vulcanodetríticas y grauváquicas de edad Rifeense Superior a Vendiense. Se discute la composición química de tales cuerpos, su evolución textural y petrogenética y se postula el carácter "andino" de estos granitoides que se corresponden bien con los originados por anatexia de la corteza continental media a profunda inducida o alimentada por magma básico de procedencia oceánica o mantélica
Abstract] Several small granitic bodies cropping out near the Ahillones quartzdiorite in the northcentral part of the Ossa Morena Zone, are described. All it belong to the tonalite-quartzdiorite-granodiorite-granite serie, hornblende and/or biotite bearing quartzdiorites and granodiorites terms being the most widespreadly represented. Dyke swarms of granite porphyry are surimposed and diabase rocks are ocasionally bordering the granitic bodies. These were affected by latehercynian brittle and dusctile shear deformations and intruded after the first hercynian phase. The host rocks are mainly Upper Riphean-Vendian. aged formations composed of greywackes, spilite breccias, tuffs~ conglomerates and arkoses, although Upper Carboniferous shales and conglomerates are as well limiting the intrusive bedies. The mayor elements geochemistry, textural and petrogenetic evolution are, in this paper, discussed and an "andino type" origin is postulated for these granitoids
Abstract] Several small granitic bodies cropping out near the Ahillones quartzdiorite in the northcentral part of the Ossa Morena Zone, are described. All it belong to the tonalite-quartzdiorite-granodiorite-granite serie, hornblende and/or biotite bearing quartzdiorites and granodiorites terms being the most widespreadly represented. Dyke swarms of granite porphyry are surimposed and diabase rocks are ocasionally bordering the granitic bodies. These were affected by latehercynian brittle and dusctile shear deformations and intruded after the first hercynian phase. The host rocks are mainly Upper Riphean-Vendian. aged formations composed of greywackes, spilite breccias, tuffs~ conglomerates and arkoses, although Upper Carboniferous shales and conglomerates are as well limiting the intrusive bedies. The mayor elements geochemistry, textural and petrogenetic evolution are, in this paper, discussed and an "andino type" origin is postulated for these granitoids