Abstract
This work presents a 3D geometric model of growth strata cropping out in a fault-propagation fold associated with the Crevillente Fault (Abanilla-Alicante sector) from the Bajo Segura Basin (eastern Betic Cordillera, southern Spain). The analysis of this 3D model enables us to unravel the along-strike and along-section variations of the growth strata, providing constraints to assess the fold development, and hence, the fault kinematic evolution in space and time. We postulate that the observed along-strike dip variations are related to lateral variation in fault displacement. Along-section variations of the progressive unconformity opening angles indicate greater fault slip in the upper Tortonian–Messinian time span; from the Messinian on, quantitative analysis of the unconformity indicate a constant or lower tectonic activity of the Crevillente Fault (Abanilla-Alicante sector); the minor abundance of striated pebbles in the Pliocene-Quaternary units could be interpreted as a decrease in the stress magnitude and consequently in the tectonic activity of the fault. At a regional scale, comparison of the growth successions cropping out in the northern and southern limits of the Bajo Segura Basin points to a southward migration of deformation in the basin. This means that the Bajo Segura Fault became active after the Crevillente Fault (Abanilla-Alicante sector), for which activity on the latter was probably decreasing according to our data. Consequently, we propose that the seismic hazard at the northern limit of the Bajo Segura Basin should be lower than at the southern limit.
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Acknowledgments
This study was supported by: Spanish Ministry of Economy and Competitiveness (Research Project: CGL2011-30153-C02-02), Alicante University (Research Project: VIGROB053). Mary Ford and Francesco Salvini are thanked for constructive reviews that helped improve the final version of the manuscript. Josep Poblet is thanked for discussions about fault-propagation folds models. David Nesbitt revised the English version of the manuscript.
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Martin-Rojas, I., Alfaro, P. & Estévez, A. 3D geometry of growth strata in a fault-propagation fold: insights into space–time evolution of the Crevillente Fault (Abanilla-Alicante sector), Betic Cordillera, Spain. Int J Earth Sci (Geol Rundsch) 104, 1387–1404 (2015). https://doi.org/10.1007/s00531-015-1143-9
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DOI: https://doi.org/10.1007/s00531-015-1143-9