Abstract

HERNANDEZ, Mariano; FRANZESE, Juan R  and  VERGANI, Gustavo D. Caracterización estructural del anticlinal Tin Tin: aspectos sobre su estilo de deformación y su relación con la tectónica Cenozoica del valle Calchaquí, provincia de Salta. Rev. Asoc. Geol. Argent. [online]. 2016, vol.73, n.3, pp.405-420. ISSN 0004-4822.

A description and interpretation of geological structures in different structural positions (flanks, hinge) of the Tin Tin anticline, a basement-cored fold formed during Cenozoic Andean contraction in the southwest sector of the Eastern Cordillera (northwestern Argentina), is presented. The majority of the structures are west-transported thrust fault-related folds which affect the Salta Group, producing the thickening of the sedimentary cover. The kinematic of these structures is synthetic with the Tin Tin anticline (west-vergence) and generally have the same NNE-SSW-strike. Minor strike-slip faults oblique to the anticlinal orientation were observed. The geometric relationship between the sedimentary cover and the basement suggests an initial event of thin-skinned deformation prior to the basement core uplift (thick-skinned deformation). In other words, the initial Cenozoic contraction began with the sedimentary cover shortening prior to the main activity of basement faults. Overall, the total deformation displayed in the anticlinal Tin Tin was generated by the combination of buckling and bending processes.

Keywords : Fault-related folds; Basement-cored anticline; Salta Group; Yacoraite Formation; Eastern Cordillera.

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