El prospecto de Cu (Ag) Las Choicas (34° 54´ 55¨S – 70°16´40¨O), un modelo de mineralización tipo IOCG, en la Cordillera Principal del SO de Mendoza

FRANCHINI, M., DE BARRIO, R., SCHALAMUK, I., RÍOS J., PONS, M.J. Y MEINERT L.,

Ciudad Autónoma de Buenos Aires

Congreso; 8° Congreso de Mineralogía y Metalogenia; 2006

Universidad de Buenos Aires

The alteration and mineralization at Las Choicas have many features in common with IOCG deposits located in the Central Andes Cordillera of Perú and Chile. The most important are the following: 1) spatial and genetic relationship to mafic diorite intrusions, 2) early widespread chlorite + calcite ± albite ± ilmenite or sphene ± apatite and local actinolite ± hematite ± biotite alteration of diorite and sedimentary rocks along contacts, 3) superposed Cu mineralization (1-10 wt % Cu) with Sb, As, Co, Ni, with Mo and Zn anomalies, associated with calcite ± albite ± quartz alteration in fractures, vein stockworks, and crackle breccias,and 4) late, barren calcite veins in distal zones.