Geochronology of the Musters quartz-monzodioritic to tonalitic stock, an Ordovician intrusive from the Valcheta area, North Patagonian Massif

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Carolina Grillo Vidal
Carmén I. Martínez Dopico
Mónica López de Luchi

Abstract

This contribution reports the first U-Pb age in zircons of a quartz-monzodioritic to tonalitic stock, here formally denominated as Musters Diorite and belonging to the group of Early Ordovician granitoids outcropping in the northeastern sector of the Northern Patagonian Massif (Punta Sierra Plutonic Complex, Busteros et al. 1998). Our results of U-Pb analyses in zircons reveal a lower ordovician crystallization age (470 ± 2 Ma; MSWD =0.99; N=70/89) for this magmatic pulse, confirming the extension of this magmatism for more than 200 km2 and showing its regional importance and connection with the Famatinian Orogeny.

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Grillo Vidal, C., Martínez Dopico, C. I., & López de Luchi, M. (2022). Geochronology of the Musters quartz-monzodioritic to tonalitic stock, an Ordovician intrusive from the Valcheta area, North Patagonian Massif. Revista De La Asociación Geológica Argentina, 79(3), 580-585. Retrieved from https://revista.geologica.org.ar/raga/article/view/1605
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