Litologías, arquitectura y cinemática de la roca de falla de la Falla de Alhama de Murcia
- J. Alonso-Henar 1
- E. Rodríguez-Escudero 1
- C. Fernández 2
- J.J. Martínez-Díaz 1
- P. Herrero-Barbero 1
- J.A. Álvarez-Gómez 1
- J.M. Insua Arévalo 1
- J.L. Sánchez-Roldán 1
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1
Universidad Complutense de Madrid
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2
Universidad de Huelva
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ISSN: 1576-5172
Year of publication: 2021
Issue Title: X Congreso Geológico de España
Issue: 18
Pages: 817
Type: Article
More publications in: Geotemas (Madrid)
Abstract
This study is a synthesis of the lithological and kinematics features of the Alhama de Murcia Fault Rock, at the Eastern Betics Shear Zone. The trenches excavation and the outcrop cleaning across the fault rock show an heterogeneous and asimetric shear zone with different deformation domains that reflect at the same time different kinematic processes. We have applied the analytic model of general triclinic transpression with oblique extrusion (Fernández and Díaz-Azpiroz, 2009). This study offers the possibility of testing the model with absolute data of active deformation such as GPS velocity gradients and opens a new methodological approach in the study of active fault zones, combining quantitative kinematics, microtectonics and geochemical analyses (Alonso-Henar et al., 2020). The obtained results point to a highly partitioned heterogeneous shear zone with domains showing competency contrasts: a low competency domain composed by the fault gouge, ductilely defor- med, with low vorticity values, which probably experienced a steady-state, aseismic slip that reflects regional convergence vectors (convergence Eurasia–Nubia); and a domain out of the fault gouge that accommodates elastic energy, with higher vorticity values, and showing convergence vectors which are parallel to the local convergence vectors calculated from the GPS velocity field.