Crystallization Conditions and Petrogenetic Characterization of Metaluminous to Peraluminous Calc-Alkaline Orogenic Granitoids from Mineralogical Systematics: The Case of the Cambrian Magmatism from the Sierra de Guasayán (Argentina)

The Sierra de Guasayán (Eastern Sierras Pampeanas, Argentina) is formed by low to medium grade metamorphic rocks intruded Cambrian metaluminous (La Soledad quartz-diorite), slightly peraluminous (Guasayán, El Escondido and Martirizado granodiorite plutons), strongly (Alto Bello granodiorite) granitoids of the Pampean magmatic arc. Chemical compositions amphibole, plagioclase, biotite, titanite indicate that these were emplaced at pressure (mostly <3 kbar) temperature (<770 °C) under oxidizing conditions (QFM + 1 QFM 2), which are similar emplacement reported for other granites Mineral assemblages whole-rock mineral chemistry from an I-type affinity La quartz-diorite (amphibole, titanite), S-type Alto (biotite, muscovite, cordierite, sillimanite), a hybrid nature main plutons monazite, magnetite). This supported presence abundant mafic microgranular enclaves rapakivi texture published zircon Hf-isotope data (?Hfi ranging ?4.76 ?0.12). suggests, in turn, involvement hybridization genesis granitoids, seems be common mechanism operating