Fault relay zones within the eastern sector of the Jiloca Basin (Iberian Chain): geometry, kinematics and analogue modelling
DOI:
https://doi.org/10.21701/bolgeomin.130.3.002Keywords:
fault, Neogene, Quaternary, radial extension, stress fieldAbstract
The eastern sector of the Jiloca basin (Iberian Chain) developed due to the right-relay arrangement of three NW-SE striking normal faults: the Calamocha, Sierra Palomera and Concud faults. Together with the Teruel fault, they all bound three relay zones where evidence of recent fracturing has been found. Thanks to the analysis of brittle deformation, at both map and outcrop scales, and to its comparison with results from analogue modelling, we are able to infer its geometrical, kinematical and dynamical relationship with the macrostructures, within the framework of the near-multidirectional extension regime active in the studied area. During analogue modelling it was important to analyse possible variations in the resulting fractures, controlled by different extension velocities in two orthogonal directions and by the orientation of the main faults within both directions of extension. The fractures, both in the studied area and in analogue models, show a mostly parallel orientation to the macrostructures that bound the relay zones. They are controlled by the main fault strikes and, to a greater extent, by the dominant ENE-WSW direction of dominant extension within the regional stress field. All this has allowed us to define a new kind of interaction within extensional fault relay zones, called in this study relay with along-strike distributed fractures.
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