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)

dc.creatorZandomeni, Priscila
dc.creatorMoreno, Juan
dc.creatorVerdecchia, Sebastián
dc.creatorBaldo, Edgardo
dc.creatorDahlquist, Juan
dc.creatorMorales Cámera, Matías
dc.creatorBalbis, Catalina
dc.creatorBenítez, Manuela E.
dc.creatorSerra Varela, Samanta
dc.creatorLembo Wuest, Carlos
dc.date2021
dc.date2021-09-22T17:17:26Z
dc.date.accessioned2023-07-15T03:22:11Z
dc.date.available2023-07-15T03:22:11Z
dc.identifierhttp://sedici.unlp.edu.ar/handle/10915/125399
dc.identifierhttps://www.mdpi.com/2075-163X/11/2/166
dc.identifierissn:2075-163X
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7465450
dc.descriptionThe Sierra de Guasayán (Eastern Sierras Pampeanas, Argentina) is formed by low to medium grade metamorphic rocks intruded by Cambrian metaluminous (La Soledad quartz-diorite), slightly peraluminous (Guasayán, El Escondido and El Martirizado granodiorite plutons), and strongly peraluminous (Alto Bello granodiorite) granitoids of the Pampean magmatic arc. Chemical compositions of amphibole, plagioclase, biotite, and titanite indicate that these granitoids were emplaced at low pressure (mostly <3 kbar) and temperature (<770 °C) under oxidizing conditions (QFM + 1 and QFM + 2), which are similar to the emplacement conditions reported for other granites of the Pampean magmatic arc. Mineral assemblages and whole-rock and mineral chemistry of the granitoids from the Sierra de Guasayán indicate an I-type affinity for the La Soledad quartz-diorite (amphibole, biotite, and titanite), S-type affinity for the Alto Bello granodiorite (biotite, muscovite, cordierite, and sillimanite), and a hybrid nature for the main Guasayán and El Escondido plutons (biotite, monazite, and magnetite). This hybrid nature is supported by the presence of abundant mafic microgranular enclaves and rapakivi texture and by published zircon Hf-isotope data (εHfi ranging from −4.76 to −0.12). This suggests, in turn, the involvement of hybridization in the genesis of these granitoids, which seems to be a common mechanism operating in the Pampean magmatic arc.
dc.descriptionInstituto de Recursos Minerales
dc.formatapplication/pdf
dc.languageen
dc.rightshttp://creativecommons.org/licenses/by/4.0/
dc.rightsCreative Commons Attribution 4.0 International (CC BY 4.0)
dc.subjectGeología
dc.subjectI-type granitoids
dc.subjectS-type granitoids
dc.subjectHybrid granitoids
dc.subjectMineral chemistry
dc.subjectGeothermobarometry
dc.subjectSierra de Guasayán
dc.subjectPampean Orogeny
dc.titleCrystallization 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)
dc.typeArticulo
dc.typeArticulo


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