U-Pb dating of the Paimán Granite, Sierra de Paimán, Chilecito, La Rioja

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Ricardo Varela
Miguel A.S. Basei
Claudia P. Pereyra

Abstract

Conventional U-Pb zircon ages for the Paimán Granite are presented. The magmatic unit crops out in the eastern border of the Famatina range. Five zircon fractions were analysed from a coarse porphyritic granitoid, the major component in the Paimán-Chilecito area. Results are concordant for the five fractions and the mean 206 Pb/ 238 U age of 477.6 ± 4.1 Ma is Early Ordovician. This age confirms that the Paimán Granite is part of the Ocloyic magmatic phase and Famatinian belt. The present age together with the previous U-Pb ages from granitoids of the Famatinian belt between 28º and 33º S suggest that the magmatic activity occurred over a short time span of about 20 Ma, following no noticeable internal polarity within the belt.

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Varela, R., Basei, M. A. ., & Pereyra, C. P. (2008). U-Pb dating of the Paimán Granite, Sierra de Paimán, Chilecito, La Rioja. Revista De La Asociación Geológica Argentina, 63(1), 97-101. Retrieved from https://revista.geologica.org.ar/raga/article/view/1278
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