Role of extensional structures on the location of folds and thrusts during tectonic inversion (northern Iberian Chain,Spain) |
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| Institution: | 1. Laboratoire GéoSciences, Université de La Réunion, Institut de Physique du Globe de Paris, UMR 7154, Sorbonne Paris Cité, CNRS, 97744 Saint Denis, France;2. Université de Lyon, Université Jean Monnet, UMR CNRS IRD 6524, Laboratoire Magmas et Volcans, F-42023 Saint Etienne, France;3. Geosciences Montpellier, CNRS UMR 5243, Université de Montpellier 2, Place Bataillon, 34095 Montpellier, cedex 5, France;1. IGSV - CONICET – UNSJ, San Juan, Argentina;2. Departamento de Geofísica, UNSJ, San Juan, Argentina;3. CCT – CONICET, San Luis, Argentina;4. Departamento de Geología, UNSL, San Luis, Argentina;5. Departamento de Física, UNS, Bahía Blanca, Argentina;1. Schmidt Institute of Physics of the Earth, RAS, 10 B. Gruzinskaya St., Moscow 123995, Russian Federation;2. Institut des Sciences de la Terre, Université Grenoble Alpes, CNRS (UMR5275), 1381, rue de la Piscine, 38610 Gieres, France;3. Institute of Mechanics, Lomonosov Moscow State University, Russian Federation;4. Lomonosov Moscow State University, Department of Physics, Russian Federation;5. Fersman Mineralogical Museum RAS, Bldg. 2, 18 Leninsky Prospekt, Moscow, Russian Federation;6. Institute of Volcanology and Seismology FEB RAS, 9 Piipa Blvd., Petropavlovsk-Kamchatsky 683006, Russian Federation |
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| Abstract: | The Aguilón Subbasin (NE Spain) was originated daring the Late Jurassic-Early Cretaceous rifting due to the action of large normal faults, probably inherited from Late Variscan fracturing. WNW-ESE normal faults limit two major troughs filled by continental deposits (Valanginian to Early Barremian). NE-SW faults control the location of subsidiary depocenters within these troughs. These basins were weakly inverted during the Tertiary with folds and thrusts striking E-W to WNW-ESE involving the Mesozoic-Tertiary cover with a maximum estimated shortening of about 12 %. Tertiary compression did not produce the total inversion of the Mesozoic basin but extensional structures are responsible for the location of major Tertiary folds. Shortening of the cover during the Tertiary involved both reactivation of some normal faults and development of folds and thrusts nucleated on basement extensional steps. The inversion style depends mainly on the occurrence and geometry of normal faults limiting the basin. Steep normal faults were not reactivated but acted as buttresses to the cover translation. Around these faults, affecting both basement and cover, folds and thrusts were nucleated due to the stress rise in front of major faults. Within the cover, the buttressing against normal faults consists of folding and faulting implying little shortening without development of ceavage or other evidence of internal deformation. |
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