Abstract

ABASCAL, L. del V.. Andean deformation in the Choromoro Basin, NW Tucuman: mixed structural styles. Rev. Asoc. Geol. Argent. [online]. 2005, vol.60, n.2, pp.268-277. ISSN 0004-4822.

The Choromoro Basin is a tectonic depression in north-western Tucuman Province. Its present structural geometry is the result of Cenozoic compression that yielded a combined deformation style on the Neogene deposits. This structural style is represented by thick- and thin-skinned tectonics, superimposed in time and space. The thin-skinned style developed in the interior of the basin, associated with a detachment surface at a depth of 2.5 to 3 km, probably in shales of the Balbuena Subgroup (Lumbrera Formation). The thickskinned deformation relates to a deep detachment at a depth of about 20 km, incorporating metamorphic basement blocks, bounded by high-angle reverse faults and tilted with the cover strata.

Keywords : Cenozoic; Tectonics; Combined deformation; Choromoro Basin.

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