info:eu-repo/semantics/article
Las Cañas plutonic complex: Geodynamic implications during the Famatinian magmatism in northeast of Sierra de San Luis, Argentina
Fecha
2019-08Registro en:
Morosini, Augusto Francisco; Enriquez, Eliel; Pagano Género, Diego Sebastián; Orozco, Brian; Ulacco, José Humberto; et al.; Las Cañas plutonic complex: Geodynamic implications during the Famatinian magmatism in northeast of Sierra de San Luis, Argentina; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 93; 8-2019; 313-347
0895-9811
CONICET Digital
CONICET
Autor
Morosini, Augusto Francisco
Enriquez, Eliel
Pagano Género, Diego Sebastián
Orozco, Brian
Ulacco, José Humberto
Tibaldi, Alina María
Cristofolini, Eber Ariel
Muñoz, Brian Lucas
Ortiz Suárez, Ariel
Montenegro, Verónica Matilde
Sanchez, Eloy Sebastian
Icazatti, Franco Alberto
Gil, Raul Andres
Crespo, Esteban María
Ramos, Gabriel Alejandro
Resumen
Las Cañas Plutonic Complex (LCPC) is a small representative of the Famatinian Ordovician plutonism (470.4 ± 8.1 Ma) located in the northeastern sector of Sierra Grande de San Luis, Argentina. The LCPC was emplaced into a metasedimentary sequence, which reached their metamorphic climax under high-temperature/low-pressure conditions (∼680 ± 37 °C and 550 ± 120 MPa). The bodies of the LCPC are zoned by rocks of different compositions that represent ultrabasic, basic, intermediate and acidic trends (hornblendites, gabbros, tonalites, and granodiorites). Their petrological, mineralogical and geochemical characteristics indicate that multiple processes formed them, mainly crystal fractionation of magnesian, calc-alkaline and metaluminous magmas (typical of arc), but also different assimilation degrees of crustal melts from the fusion of metawackes involving AFC processes. Fieldwork (structural and petrological data), the geochemical characteristics of rocks [eg. Low Sr/Y and (Gd/Yb)C- N], and thermobarometric results, indicate a relatively shallow fractionalization for the LCPC, which is in line with a pre-collisional arc stage linked to an extensive retro-arc setting for the Famatinian orogeny in Sierra de San Luis.