Publication: El registro geológico de las deformaciones alpinas en Iberia: Partición de la deformación o fases tectónicas
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2018-12
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Sociedad Geológica de España
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Abstract
El registro geológico de las deformaciones alpinas en el interior de Iberia durante el Cenozoico, indica la presencia de varios campos de paleoesfuerzos. Desde el análisis de poblaciones de microestructuras, se han propuesto varios campos (“Pirenaico”, “Bético”, “Ibérico”…), actuando en momentos diferentes.
Se propone aquí un modelo alternativo que, mediante una única compresión N-S, y un proceso de partición de la deformación, explicaría la aparición de campos de esfuerzos locales relacionados con el movimiento impuesto por la presencia de macroestructuras previas, tanto en la Cadena Ibérica, como en las Cadenas Costero Catalanas y en el Sistema Central Hispano-Portugués. La deformación se reparte entre desgarres y cabalgamientos NE-SO y NO-SE para acomodar un acortamiento generalizado N-S.
The geological record of the alpine deformations in the interior of Iberia during the Cenozoic, indicates the presence of several paleo-stress fields. From the analysis of microstructural populations, several fields ("Pyrenean", "Betic", "Iberian"...) have been proposed, acting at different times. An alternative model is proposed here which, by means of a single N-S compression and a process of strain partitioning, would explain the appearance of local stress fields related to the movement imposed by the presence of previous macrostructures, both in the Iberian Chain and in the Catalan Coastal Ranges and in the Spanish-Portuguese Central System. The deformation is distributed between NE-SW and NW-SE strike-slip faults and thrusts to accommodate a general N-S shortening
The geological record of the alpine deformations in the interior of Iberia during the Cenozoic, indicates the presence of several paleo-stress fields. From the analysis of microstructural populations, several fields ("Pyrenean", "Betic", "Iberian"...) have been proposed, acting at different times. An alternative model is proposed here which, by means of a single N-S compression and a process of strain partitioning, would explain the appearance of local stress fields related to the movement imposed by the presence of previous macrostructures, both in the Iberian Chain and in the Catalan Coastal Ranges and in the Spanish-Portuguese Central System. The deformation is distributed between NE-SW and NW-SE strike-slip faults and thrusts to accommodate a general N-S shortening