%0 Journal Article
%T Caracter赤sticas petrogr芍ficas y geoqu赤micas de la Tonalita La Ovejer赤a, borde oriental de la Sierra del Aconquija, Taf赤 del Valle, Tucum芍n: integraci車n con la Granodiorita El Infiernillo
%A L車pez
%A Jose P.
%A Bellos
%A Laura
%A Castro
%A Antonio
%J Serie Correlaci車n Geol車gica
%D 2011
%I Instituto Superior de Correlaci車n Geol車gica
%X The La Ovejer赤a Tonalite is a N-S elo ngated body that crops out on the eastern side of the Sierra del Aconquija, west of of Tafi del Valle, Tucum芍n Province, Argentina. It is located just south of thelarger, and probably genetically related, El Infiernillo Granodiorite. The studied pluton has a zoning determined by different grain sizes and mineralogies: the northern outcrops are medium-grained and composed of plagioclase, quartz scarce microcline, and biotite and pistacite (㊣ tourmaline) as major accessories; the southern part of the intrusive is fine grained and composed of plagioclase, quartz scarce microcline, and biotite and sphene as accessory minerals. Two meter thick granitic dikes cross-cut the tonalites. The tonalite is calc-alkaline and peraluminous, with an ASI between 1.10 and 1.48. It intrudes metamorphic basement rocks composed of low grade schists that are characterized by an increase in static metamorphism, by syntectonic intrusions and by the intensity of flow folds.The emplacement of the La Ovejer赤a Tonalite probably occurred during the Lower Paleozoic and was structurally controlled by the Tafi Megafracture, like the other intrusive bodies of the area. The El Infiernillo intrusive is composed of a two-mica (㊣ tourmaline) equigranular granodiorite main facies and a biotite and epidote bearing (without primary muscovite) tonalitic border facies. According to field relations and petrographic, geochemical and structural data, the La Ovejer赤a Tonalite may correspond to the northern border facies of the El Infiernillo intrusive.
%K Petrography
%K Geochemistry
%K La Ovejeria Tonalite
%K El Infiernillo Granodiorite
%K Sierra del Aconquija.
%U http://www.insugeo.org.ar/libros/cg_28-1/05.htm