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DIGITAL.CSIC
Article . 2008 . Peer-reviewed
Data sources: DIGITAL.CSIC
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Docta Complutense
Article . 1992
Data sources: Docta Complutense
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Una nueva hipótesis sobre las primeras etapas de la evolución tectosedimentaria de la cuenca pérmico-triásica del SE de la Cordillera ibérica

Authors: Arche, Alfredo; López Gómez, José;

Una nueva hipótesis sobre las primeras etapas de la evolución tectosedimentaria de la cuenca pérmico-triásica del SE de la Cordillera ibérica

Abstract

[ES] La facies Buntsandstein representa una de las primeras etapas de evolución tectosedimentaria del SE de la Cordillera Ibérica. Está constituida por cuatro formaciones continentales, principalmente fluviales, que forman dos macrosecuencias de granulometría decreciente separadas por una discontinuidad. La base está marcada por una importante discordancia angular y eltecho también es una discontinuidad. La Cuenca Ibérica SE comienza a formarse a finales del Pérmico como una depresión endorreica con estructura de semigraben, limitada por fallas normales de orientación NO-SE y evoluciona aun graben clásico durante el Triásico inferior. Las fallas maestras de este «rift» se interpretan como lístricas que se deben hacer casi horizontales a una profundidad pequeña (12-15 Kms.) en lugar de fallas casi verticales y profundas, como hacían las reconstrucciones hasta ahora publicadas. Un sistema de fracturas de orientación NNE-SSO constituye a su vez una vía de relajación de las fallas maestras incrementando su actuación hacia el SE y a partir del Pérmico superior. La disposición y morfología general de las fracturas facilitará el despegue de mantos producidos durante etapas compresivas posteriores.

[EN] Ihe Buntsandstein facies represents the first stages of the tecto-sedimentary evolution of the SE Iberian Ranges and consists of four continental formations, basically fluvial, associated in two fining-upwards macrosequences. There is an important angular unconformity, at the base and two hiatuses, one in the middle part and another at the top. The SE Iberian Basin appears at ffie end of the Permian as an endorreic depression with a semigraben structure, limited by NW-SE normal faults and evolves towards aclassic graben during the Early Triassic. The boundary faults are interpreted as listric faults dying out at perhaps 12-15 Kms, instead deep-seated, alniost vertical faults as in pre’vious reconstructions. A NNE-SSW fault system represents a transfert system of the main NW-SE faults, increasing their throw towards the SE and from the upper Permian. The orientation and morphology of the general faulí systems will control the movement of later thrust faults dwing the Tertiary.

Esta es una aportación al Proyecto PB 87-0322 financiado por la C.I.C.Y.T.

Peer reviewed

Country
Spain
Keywords

Cordillera Ibérica, 2506.19 Estratigrafía, Subsidencia, Permian, Muschelkalk, Buntsandstein, Triassic, Subsidence, Pérmico, Extensión, 551.736/.551.761, Extension, Geología estratigráfica, Buntsandstein facies, Iberian Ranges, Triásico

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