Alpine microfracturing in quartz-arenites in the Tarna valley (Cantabrian Mountains)
DOI:
https://doi.org/10.55407/geogaceta98254Keywords:
fault, cataclastic bands, Cantabrian Mountains, slip surface, alpine deformationAbstract
Deformation associated to the Cenozoic rise of the Cantabrian Mountains is characterized by the development of faults with hectometric offsets, the reworking of previous structures, and the fracturing of the strongest lithological units of the preorogenic Paleozoic sequence, already affected by previous tectonic episodes in the brittle regime. In this contribution, new structural data from the fracturing of quartzarenites from the Barrios Fm and adjacent units in the slopes of Peña Grayal (Tarna valley, Asturias) are presented. These rocks contain several compressive cataclastic bands, some of which develop polished fault slip surfaces. The dominant slip surfaces are subvertical, left-lateral and with northeasterly trend, in coincidence with the orientation and kinematics of secondary cartographic faults with apparent left lateral offsets. Together with the neighbouring Ventaniella fault, also subvertical but with dextral offset and a northwesterly strike, are consistent with a N-S alpine shortening. The orientation of one of the systems of cataclastic bands, trending E-W and dipping gently to the north, is consistent with the orientation and kinematics of the main alpine thrusts onshore.
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