Jurassic extension and Cenozoic inversion tectonics in the Asturian Basin,NW Iberian Peninsula: 3D structural model and kinematic evolution |
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| Institution: | 1. University of Aberdeen, School of Geosciences, Geology and Petroleum Geology Department, Meston Building, King''s College, Aberdeen AB24 3UE, Scotland, UK;2. Federal University of Technology, School of Physical Sciences, Geology Department, Bosso Campus, PMB 65, Minna, Nigeria;3. Institute of Earth Sciences, Johannes Gutenberg University Mainz, Mainz, Germany;1. The Mineral and Energy Economy Research Institute of the Polish Academy of Sciences, Wybickiego 7A, 31-261 Krakow, Poland;2. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, United States;3. Cracow University of Technology, Warszawska 24, 31-155 Krakow, Poland;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 |
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| Abstract: | We constructed a geological map, a 3D model and cross-sections, carried out a structural analysis, determined the stress fields and tectonic transport vectors, restored a cross section and performed a subsidence analysis to unravel the kinematic evolution of the NE emerged portion of the Asturian Basin (NW Iberian Peninsula), where Jurassic rocks crop out. The major folds run NW-SE, normal faults exhibit three dominant orientations: NW-SE, NE-SW and E-W, and thrusts display E-W strikes. After Upper Triassic-Lower Jurassic thermal subsidence, Middle Jurassic doming occurred, accompanied by normal faulting, high heat flow and basin uplift, followed by Upper Jurassic high-rate basin subsidence. Another extensional event, possibly during Late Jurassic-Early Cretaceous, caused an increment in the normal faults displacement. A contractional event, probably of Cenozoic age, led to selective and irregularly distributed buttressing and fault reactivation as reverse or strike-slip faults, and folding and/or offset of some previous faults by new generation folds and thrusts. The Middle Jurassic event could be a precursor of the Bay of Biscay and North Atlantic opening that occurred from Late Jurassic to Early Cretaceous, whereas the Cenozoic event would be responsible for the Pyrenean and Cantabrian ranges and the partial closure of the Bay of Biscay. |
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| Keywords: | Normal fault Reverse fault Reactivated fault Inversion tectonics Basin inversion Jurassic Asturian Basin |
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