Geoquímica de las rocas filonianas asociadas a la etapa tardía y post magmática del Granito Papachacra, Sierras Pampeanas, Catamarca, Argentina

Abstract

“Geochemistry of the hypabyssal rocks related to late and postmagmatic stage of Papachacra Granite, Pampean Ranges, Argentina”. Papachacra Granite (Pampean Ranges, Argentina) is an evolved, peraluminous, post-tectonic pluton, correlated to other Devonian- Carboniferous granites from Pampean Ranges on the base of geology and geochemistry. It has high values of Rb, Y, REE, Th, and U, and Ba/Rb ratio which ranges from 0,05 to 0,01. There are two trends of geochemistry evolution during late to postmagmatic stage: the main trend includes Papachacra Granite, microgranitic and pegmatitic dikes, Altohuasi porfiric body, spherulitic bodies, and the other trend includes Alto de la Mina porfiric dikes (DPM) and probably pseudobanded dikes. CPA has strong geochemistry affinity with the granite and differs from DPM in the Co, Ni, and Ba contents. The DPM are a separated branch from the granitic trend. At the end two rock types, one like the granite (greissen and tungsten veins) and the other base metals - bearing veins are developed.