Artículo
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)
Zandomeni, Priscila Soledad
; Moreno Moreno, Juan Antonio
; Verdecchia, Sebastián Osvaldo
; Baldo, Edgardo Gaspar Agustin
; Dahlquist, Juan Andrés
; Morales Camera, Matías Martín
; Balbis, Catalina
; Benítez, Manuela
; Serra Varela, Samanta
; Lembo Wuest, Carlos Iván
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Fecha de publicación:
02/2021
Editorial:
Multidisciplinary Digital Publishing Institute
Revista:
Minerals
ISSN:
2075-163X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The Sierra de Guasayán (Eastern Sierras Pampeanas, Argentina) is formed by low to me-dium 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 em-placed 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.
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Identificadores
Colecciones
Articulos(CICTERRA)
Articulos de CENTRO DE INVEST.EN CS.DE LA TIERRA
Articulos de CENTRO DE INVEST.EN CS.DE LA TIERRA
Articulos(IIPG)
Articulos de INSTITUTO DE INVESTIGACION EN PALEOBIOLOGIA Y GEOLOGIA
Articulos de INSTITUTO DE INVESTIGACION EN PALEOBIOLOGIA Y GEOLOGIA
Citación
Zandomeni, Priscila Soledad; Moreno Moreno, Juan Antonio; Verdecchia, Sebastián Osvaldo; Baldo, Edgardo Gaspar Agustin; Dahlquist, Juan Andrés; et al.; 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); Multidisciplinary Digital Publishing Institute; Minerals; 11; 2; 2-2021; 1-21
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