U-Th-Pb chemical dating in monazite in the andalusite-garnet-staurolite-sillimanite schists of the Cushamen Complex (Chubut, Argentina): reconstructing the P-T-t path

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Samanta Serra-Varela
Sebastián Verdecchia
Fernando Colombo
Carlos Iván Lembo Wuest
Manuela Benitez
Juan Murra
Edgardo Baldo

Abstract

This study presents the first U-Th-Pb CHIME monazite dating in andalusite-garnet-staurolite-sillimanite schists from the Cushamen Complex (Chubut, Argentina). It represents the first age obtained by this method in Argentina. X-ray elemental distribution maps were performed to assess possible zoning patterns resulting in zoned monazites with Th depletion and Ce enrichment toward the rims. Results reveal a correlation between the polymetamorphic P-T evolution with three groups of ages calculated from punctual analyses of monazite with ages of ca. 354, 333 and 300 Ma, consistent with main metamorphic events identified regionally in North Patagonia.

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Serra-Varela, S., Verdecchia, S., Colombo, F., Lembo Wuest, C. I., Benitez, M., Murra, J., & Baldo, E. (2025). U-Th-Pb chemical dating in monazite in the andalusite-garnet-staurolite-sillimanite schists of the Cushamen Complex (Chubut, Argentina): reconstructing the P-T-t path. Revista De La Asociación Geológica Argentina, 81(4), 748-757. Retrieved from https://revista.geologica.org.ar/raga/article/view/1813
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