Shape preferred orientation of dolostone bodies of a Triassic broken formation at the western External Betics
Orientación preferente de forma de cuerpos de dolomías de una broken formation triásica en las Béticas Externas occidentales
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Publication Date
2020 -
Publisher
Sociedad Geológica de España -
Abstract
Detailed structural analyses of block-in-matrix formations are key to understand the tectonic processes involved in the external zones of many convergent orogens. One of these formations, with a highly controversial origin and evolution, marks the boundary between the fold-and-thrust belt and the foreland basin of the Betics. We analyzed dolostone bodies from this block-in-matrix formation in the western External Betics (Badolatosa, Sevilla), affected by the Algodonales-Badolatosa shear zone, to obtain a partial SPO (θ angle between long axes and the shear zone boundary). Our results define a main 500-1200 m-wide band strongly controlled by deformation at the WNW-NNW boundary of this shear zone. Minor, heterogeneously distributed bands with a moderate SPO are tentatively interpreted as Riedel shears related to dextral transpression
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