K/Ar ages from east Nahuel Pan hills, Chubut. Implicance in the Divisadero and Choiyoi Groups correlation

Main Article Content

M.E. Vattuone
C.O. Latorre

Abstract

A sequence of dacitic/andesitic flows and pyroclastic rocks, in discordance above basandesitic volcanic series at eastern Nahuel Pan hills, has been dated by K/Ar method. Samples of the flows and basandesitic volcanic rocks yield ages of 105 ± 5 Ma and 252 ± 10 Ma. These ages assign to the lavic-pyroclastic sequence a Cretaceous age (at the lower part of upper member of Divisadero Group) and to the basandesitic volcanic rocks a Permotriassic age (in line with Choiyoi Group). This is the first occurrence, of the Choiyoi Group, in the eastern slope of the Andes at this latitude.

Article Details

How to Cite
Vattuone, M., & Latorre, C. (2004). K/Ar ages from east Nahuel Pan hills, Chubut. Implicance in the Divisadero and Choiyoi Groups correlation. Revista De La Asociación Geológica Argentina, 59(3), 510-513. Retrieved from https://revista.geologica.org.ar/raga/article/view/1457
Section
Short notes