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Revista de la Asociación Geológica Argentina
versão impressa ISSN 0004-4822
Resumo
MOROSINI, Augusto e ORTIZ SUAREZ, Ariel. The Famatinian deformation of La Escalerilla Granite, Sierra de San Luis. Rev. Asoc. Geol. Argent. [online]. 2010, vol.67, n.4, pp.481-493. ISSN 0004-4822.
In this paper post-magmatic structures of La Escalerilla Granite are analyzed and an interpretation of regional deformation mechanisms is proposed for cycle Famatinian of the Southwestern sector of the Sierra de San Luis. It is thought that La Escalerilla pluton has conditioned the style of deformation of the lithologic units at its periphery. This deformation was linked to the rheological contrast which occurred between the intrusive and metamorphic country rocks. The structure of the pluton is characterized by the presence of: a) an internal foliation of submeridianal orientation particularly marked in the border sectors, as well as to the north and south of the body; b) a NNE-trending mylonitic belt in the eastern contact; c) conjugated shears of synthetic Riedel (NNW) and antithetic Riedel (NE) types, interpreted as part of an tectonic escape under a sinestral transpressive regime; and d) tensional fractures of WNW orientation. All these structures are thought to correspond to the compression in the WNW-ESE direction, generating a real component of tangential sinestral stress, of variable module, because of the pluton general obliquity with relation the axis of maximum stress (σ1). However, in some sectors this tangential component is minimal due to the different orientations of the boundaries of the body with respect to the vector of maximum stress (σ1).
Palavras-chave : Structure; Ductile; Rheology; Tectonic escape; Sierras Pampeanas.