PLUTÓN CAPILLA DEL MONTE, SIERRAS DE CÓRDOBA: NUEVOS APORTES METALOGENÉTICOS, CARTOGRÁFICOS Y PETROLÓGICOS

AGULLEIRO INSÚA, LEONARDO ALFREDO; CONIGLIO, JORGE ENRIQUE; D'ERAMO, FERNANDO JAVIER; PINOTTI, LUCIO PEDRO; DEMARTIS, MANUEL; PETRELLI, HUGO ALBERTO

San Juan

Congreso; 11° Congreso de Mineralogía y Metalogenia; 2013

Asociación Mineralógica Argentina - Facultad de Ciencias Exactas Físicas y Naturales, Universidad Nacional de San Juan

In the Capilla Del Monte Pluton (CMP), Córdoba ranges, new metallogenic, mapping and petrological contributions were made. The CMP is a circularly-shaped granite mainly composed of three facies, which have a reverse zoning pattern, from west to east: 1) porphyritic biotite monzogranite, 2) pink muscovite inequigranular leucogranite and 3) white muscovite inequigranular leucogranite. Another facies with lower areal distribution consists of subvolcanic leucogranite porphyry. Commonly this granites presents miarolitic cavities, filled with quartz, k-feldspar, spodumene and apatite. Both synmagmatic - postmagmatic dykes like mafic microgranular enclaves and xenoliths of surrounding rocks are almost exclusives of facies 1. Rocks are composed of biotite (8 to 1%, from facies 1 to 3), plagioclase, microcline, muscovite and quartz. Accessories are represented by zircon, apatite and subordinately monacite. Fluorite is a secondary phase in facies 1 and accessory in facies 3. Major elements vary from 1 to 3 as follows: 70,3 to 76,5% (SiO2); 1,67 to 0,26% (CaO); 0,68 to 0,11% (MgO); 7,06 to 3,79% (K2O); 2,97 to 3,70% (Na2O); 0,67 to 0,09 (TiO2) and 0,22 to 0,31 (P2O5). Rocks are peraluminous (ISA= 1.1 ? 1.3) and belong to the High ? K Series. The Rb-Ba-Sr relationship shows a tendency to strongly differentiated granites. The average F content is 1850 ppm and varies from 1200ppm (facies 1) to 2600ppm (facies 3). Both F and P have an incompatible behaviour with advancing magmatic evolution. Hydrothermal activity is marked by an increase of quartz veins, sacharoid fluorite veins and breccias towards the eastern border of CMP. Field, petrographic and geochemical evidences shown in this paper indicate that the central-eastern sector of the CMP, in the surroundings of the Uritorco Hill, displays the greatest metallogenic interest and its strong potential for W, Mo, F and U mineralizations is therefore confirmed.