Abstract

ARAUJO, Vanesa S. et al. Emplacement of the Laguna Amarga subvolcanic body and its relationship with andean tectonic structures, Southern Mendoza Province. Rev. Asoc. Geol. Argent. [online]. 2013, vol.70, n.1, pp.40-52. ISSN 0004-4822.

The Laguna Amarga sub-volcanic intrusive is located in the Cordillera Principal, between the Diamante and Atuel rivers, approximately 34° 45' South latitude and 69° 32' West longitude, province of Mendoza. This study reflects the shape and the emplacement model of this intrusive, which resembles a group of sills connected with a laccolith, emplaced through a system of faults. The Laguna Amarga body is part of the Neogene magmatism in the south of Mendoza, and is related to the Huincán cycle of Middle to Late Miocene (13 to 5 Ma) age. From a petrological-geochemical analysis we established that the body is formed mostly by andesitic rocks that show similar textural and mineralogical characteristics in the central part of the body and in its accompanying sills. These rocks belong to the Andean magmatic arc, and thus its emplacement can be related to the subduction of the Pacific Plate. The body of Laguna Amarga has a geometry that is related to the emplacement of magma through fault systems that are used as feed channels. These bodies were emplaced during the Andean compression contemporaneously with fault systems that propagate towards the foreland.

Keywords : Laccolith; Ciclo eruptivo Huincán; Malargüe fold and thrust belt; Cordillera Principal.

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