Rb-Sr evidence for the presence of Ordovician gsranites in the deformed basement of the Badajoz-Córdoba belt,SW Spain |
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Authors: | J L García Casquero N A I M Boelrijk J Chacón H N A Priem |
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Institution: | (1) Present address: Z. W. O. Laboratorium voor Isotopen-Geologie, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands;(2) Departamento de Geotectónica y Geomorfología, C.S.I.C. Universidad de Granada, Granada;(3) Present address: Departamento de Investigaciones Geológicas, C.S.I.C. Universidad de Granada, Granada;(4) Departamento de Geomorfología y Geotectonica, Faculdad de Cieucias, Universidad de Salamanca, Salamanca, Spain |
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Abstract: | A Rb-Sr whole-rock investigation of suites of samples from two orthogneiss bodies in the Almendralejo area of the Oporto-Portalegre-Badajoz-Córdoba belt points to an Ordovician age for the granitic magmatism: about 470 Ma for the Almendralejo Gneiss (peralkaline metagranite) and about 425 Ma for the Ribera del Fresno Gneiss (leucocratic subaluminous metagranite), both with high initial87Sr/86Sr ratios. This points to a post-Ordovician (Hercynian) age for the metamorphism and tectonic deformation that affected the area, including the gneisses, and rules out the alleged Cadomian or even older age.
Zusammenfassung Die Rb-Sr-Gesamtgesteinsanalysen von Probeserien zweier orthogneisischer Körper der Almendralejo-Region des Oporto-Portalegre-Badajoz-Córdoba-Gürtels weisen auf ein ordovizisches Alter des granitischen Magmas hin: rund 470 Ma für den Almendralejo-Gneis (peralkaliner Metagranit) und rund 425 Ma für den Ribera del Fresno-Gneis (leukokratischer Metagranit), beide bei einem hohen initialen87Sr/86Sr. Diese Ergebnisse deuten auf ein post-ordovizisches (herzynisches) Alter der Metamorphose und der tektonischen Deformation hin, die das Gebiet, einschließ-lich des Gneises, beeinflußt haben. Sie schließen ein vermeintliches kadomisches oder älteres Alter aus.
Résumé Une étude par Rb-Sr sur roche totale de séries d'échantillons de deux massifs d'orthogneiss de la région d'Almendralejo, dans la ceinture Oporto-Portalegre-Badajoz-Cordoue, indique un âge ordovicien pour le magmatisme granitique: environ 470 Ma pour le gneiss d'Almendralejo (métagranite peralcalin) et environ 425 Ma pour le gneiss de Ribera del Fresno (métagranite leucocrate subalumineux), tous deux avec des rapports initiaux87Sr/86Sr élevés. Ces résultats indiquent un âge post-ordovicien (hercynien) pour le métamorphisme et la déformation tectonique qui ont affecté la région, y compris les gneiss, et éliminent l'hypothèse proposée par ailleurs d'un âge cadomien ou même plus ancien.
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![scy](/content/v4374230u4421k12/xxlarge1089.gif) ![ocy](/content/v4374230u4421k12/xxlarge1086.gif) ![ocy](/content/v4374230u4421k12/xxlarge1086.gif) ![tcy](/content/v4374230u4421k12/xxlarge1090.gif) ![ncy](/content/v4374230u4421k12/xxlarge1085.gif) ![ocy](/content/v4374230u4421k12/xxlarge1086.gif) ![shcy](/content/v4374230u4421k12/xxlarge1096.gif) ![iecy](/content/v4374230u4421k12/xxlarge1077.gif) ![ncy](/content/v4374230u4421k12/xxlarge1085.gif) ![icy](/content/v4374230u4421k12/xxlarge1080.gif) 87Sr/86Sr ![ncy](/content/v4374230u4421k12/xxlarge1085.gif) ![icy](/content/v4374230u4421k12/xxlarge1080.gif) . ![tcy](/content/v4374230u4421k12/xxlarge1090.gif) ![dcy](/content/v4374230u4421k12/xxlarge1076.gif) ![acy](/content/v4374230u4421k12/xxlarge1072.gif) ![ncy](/content/v4374230u4421k12/xxlarge1085.gif) ![ncy](/content/v4374230u4421k12/xxlarge1085.gif) ![ycy](/content/v4374230u4421k12/xxlarge1099.gif) ![ucy](/content/v4374230u4421k12/xxlarge1091.gif) 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![icy](/content/v4374230u4421k12/xxlarge1080.gif) (![gcy](/content/v4374230u4421k12/xxlarge1075.gif) ![rcy](/content/v4374230u4421k12/xxlarge1088.gif) ![tscy](/content/v4374230u4421k12/xxlarge1094.gif) ![icy](/content/v4374230u4421k12/xxlarge1080.gif) ![ncy](/content/v4374230u4421k12/xxlarge1085.gif) ![scy](/content/v4374230u4421k12/xxlarge1089.gif) ![kcy](/content/v4374230u4421k12/xxlarge1082.gif) ![icy](/content/v4374230u4421k12/xxlarge1080.gif) ) ![vcy](/content/v4374230u4421k12/xxlarge1074.gif) ![ocy](/content/v4374230u4421k12/xxlarge1086.gif) ![zcy](/content/v4374230u4421k12/xxlarge1079.gif) ![rcy](/content/v4374230u4421k12/xxlarge1088.gif) ![acy](/content/v4374230u4421k12/xxlarge1072.gif) ![scy](/content/v4374230u4421k12/xxlarge1089.gif) ![mcy](/content/v4374230u4421k12/xxlarge1084.gif) ![iecy](/content/v4374230u4421k12/xxlarge1077.gif) ![acy](/content/v4374230u4421k12/xxlarge1072.gif) ![mcy](/content/v4374230u4421k12/xxlarge1084.gif) ![ocy](/content/v4374230u4421k12/xxlarge1086.gif) ![rcy](/content/v4374230u4421k12/xxlarge1088.gif) ![fcy](/content/v4374230u4421k12/xxlarge1092.gif) ![icy](/content/v4374230u4421k12/xxlarge1080.gif) ![zcy](/content/v4374230u4421k12/xxlarge1079.gif) ![mcy](/content/v4374230u4421k12/xxlarge1084.gif) ![ncy](/content/v4374230u4421k12/xxlarge1085.gif) ![tcy](/content/v4374230u4421k12/xxlarge1090.gif) ![iecy](/content/v4374230u4421k12/xxlarge1077.gif) ![kcy](/content/v4374230u4421k12/xxlarge1082.gif) ![tcy](/content/v4374230u4421k12/xxlarge1090.gif) ![ocy](/content/v4374230u4421k12/xxlarge1086.gif) ![ncy](/content/v4374230u4421k12/xxlarge1085.gif) ![icy](/content/v4374230u4421k12/xxlarge1080.gif) ![chcy](/content/v4374230u4421k12/xxlarge1095.gif) ![iecy](/content/v4374230u4421k12/xxlarge1077.gif) ![scy](/content/v4374230u4421k12/xxlarge1089.gif) ![kcy](/content/v4374230u4421k12/xxlarge1082.gif) ![icy](/content/v4374230u4421k12/xxlarge1080.gif) ![pcy](/content/v4374230u4421k12/xxlarge1087.gif) ![ocy](/content/v4374230u4421k12/xxlarge1086.gif) ![tscy](/content/v4374230u4421k12/xxlarge1094.gif) ![iecy](/content/v4374230u4421k12/xxlarge1077.gif) ![scy](/content/v4374230u4421k12/xxlarge1089.gif) ![scy](/content/v4374230u4421k12/xxlarge1089.gif) ![dcy](/content/v4374230u4421k12/xxlarge1076.gif) ![iecy](/content/v4374230u4421k12/xxlarge1077.gif) ![fcy](/content/v4374230u4421k12/xxlarge1092.gif) ![ocy](/content/v4374230u4421k12/xxlarge1086.gif) ![rcy](/content/v4374230u4421k12/xxlarge1088.gif) ![mcy](/content/v4374230u4421k12/xxlarge1084.gif) ![acy](/content/v4374230u4421k12/xxlarge1072.gif) ![tscy](/content/v4374230u4421k12/xxlarge1094.gif) ![icy](/content/v4374230u4421k12/xxlarge1080.gif) , ![kcy](/content/v4374230u4421k12/xxlarge1082.gif) ![ocy](/content/v4374230u4421k12/xxlarge1086.gif) ![tcy](/content/v4374230u4421k12/xxlarge1090.gif) ![ocy](/content/v4374230u4421k12/xxlarge1086.gif) ![rcy](/content/v4374230u4421k12/xxlarge1088.gif) ![acy](/content/v4374230u4421k12/xxlarge1072.gif) ![pcy](/content/v4374230u4421k12/xxlarge1087.gif) ![ocy](/content/v4374230u4421k12/xxlarge1086.gif) ![vcy](/content/v4374230u4421k12/xxlarge1074.gif) ![lcy](/content/v4374230u4421k12/xxlarge1083.gif) ![icy](/content/v4374230u4421k12/xxlarge1080.gif) ![yacy](/content/v4374230u4421k12/xxlarge1103.gif) ![lcy](/content/v4374230u4421k12/xxlarge1083.gif) ![ncy](/content/v4374230u4421k12/xxlarge1085.gif) ![scy](/content/v4374230u4421k12/xxlarge1089.gif) ![ocy](/content/v4374230u4421k12/xxlarge1086.gif) ![bcy](/content/v4374230u4421k12/xxlarge1073.gif) ![lcy](/content/v4374230u4421k12/xxlarge1083.gif) ![acy](/content/v4374230u4421k12/xxlarge1072.gif) ![scy](/content/v4374230u4421k12/xxlarge1089.gif) ![tcy](/content/v4374230u4421k12/xxlarge1090.gif) , ![tcy](/content/v4374230u4421k12/xxlarge1090.gif) ![acy](/content/v4374230u4421k12/xxlarge1072.gif) ![kcy](/content/v4374230u4421k12/xxlarge1082.gif) ![zhcy](/content/v4374230u4421k12/xxlarge1078.gif) ![ncy](/content/v4374230u4421k12/xxlarge1085.gif) ![gcy](/content/v4374230u4421k12/xxlarge1075.gif) ![ncy](/content/v4374230u4421k12/xxlarge1085.gif) ![iecy](/content/v4374230u4421k12/xxlarge1077.gif) ![jcy](/content/v4374230u4421k12/xxlarge1081.gif) ![scy](/content/v4374230u4421k12/xxlarge1089.gif) . ![Ecy](/content/v4374230u4421k12/xxlarge1069.gif) ![tcy](/content/v4374230u4421k12/xxlarge1090.gif) ![dcy](/content/v4374230u4421k12/xxlarge1076.gif) ![acy](/content/v4374230u4421k12/xxlarge1072.gif) ![ncy](/content/v4374230u4421k12/xxlarge1085.gif) ![ncy](/content/v4374230u4421k12/xxlarge1085.gif) ![ycy](/content/v4374230u4421k12/xxlarge1099.gif) ![icy](/content/v4374230u4421k12/xxlarge1080.gif) ![scy](/content/v4374230u4421k12/xxlarge1089.gif) ![lcy](/content/v4374230u4421k12/xxlarge1083.gif) ![yucy](/content/v4374230u4421k12/xxlarge1102.gif) ![chcy](/content/v4374230u4421k12/xxlarge1095.gif) ![acy](/content/v4374230u4421k12/xxlarge1072.gif) ![yucy](/content/v4374230u4421k12/xxlarge1102.gif) ![kcy](/content/v4374230u4421k12/xxlarge1082.gif) ![acy](/content/v4374230u4421k12/xxlarge1072.gif) ![dcy](/content/v4374230u4421k12/xxlarge1076.gif) ![ocy](/content/v4374230u4421k12/xxlarge1086.gif) ![mcy](/content/v4374230u4421k12/xxlarge1084.gif) ![scy](/content/v4374230u4421k12/xxlarge1089.gif) ![kcy](/content/v4374230u4421k12/xxlarge1082.gif) ![icy](/content/v4374230u4421k12/xxlarge1080.gif) , ![icy](/content/v4374230u4421k12/xxlarge1080.gif) ![lcy](/content/v4374230u4421k12/xxlarge1083.gif) ![bcy](/content/v4374230u4421k12/xxlarge1073.gif) ![ocy](/content/v4374230u4421k12/xxlarge1086.gif) ![lcy](/content/v4374230u4421k12/xxlarge1083.gif) ![iecy](/content/v4374230u4421k12/xxlarge1077.gif) ![dcy](/content/v4374230u4421k12/xxlarge1076.gif) ![rcy](/content/v4374230u4421k12/xxlarge1088.gif) ![iecy](/content/v4374230u4421k12/xxlarge1077.gif) ![vcy](/content/v4374230u4421k12/xxlarge1074.gif) ![ncy](/content/v4374230u4421k12/xxlarge1085.gif) ![icy](/content/v4374230u4421k12/xxlarge1080.gif) ![vcy](/content/v4374230u4421k12/xxlarge1074.gif) ![ocy](/content/v4374230u4421k12/xxlarge1086.gif) ![zcy](/content/v4374230u4421k12/xxlarge1079.gif) ![rcy](/content/v4374230u4421k12/xxlarge1088.gif) ![acy](/content/v4374230u4421k12/xxlarge1072.gif) ![scy](/content/v4374230u4421k12/xxlarge1089.gif) ![ecy](/content/v4374230u4421k12/xxlarge1101.gif) ![tcy](/content/v4374230u4421k12/xxlarge1090.gif) ![icy](/content/v4374230u4421k12/xxlarge1080.gif) ![gcy](/content/v4374230u4421k12/xxlarge1075.gif) ![ncy](/content/v4374230u4421k12/xxlarge1085.gif) ![iecy](/content/v4374230u4421k12/xxlarge1077.gif) ![jcy](/content/v4374230u4421k12/xxlarge1081.gif) ![scy](/content/v4374230u4421k12/xxlarge1089.gif) ![ocy](/content/v4374230u4421k12/xxlarge1086.gif) .
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