First absolute ages for Holoceno lacustrine deposits of the Jáchal river, Precordillera of San Juan

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Ferrán Colombo
Carlos Limarino
Pedro Busquets
Nuria Solé de Porta
Nemesio Heredia
Roberto Rodríguez Fernández
Joaquín Alvarez Marron

Abstract

In this paper are discussed the first absolute ages obtained for Holocene lacustrine deposits found in the upper reach of the Jáchal river. The Quaternary record has been divided in three informal alloformations, each one of them characterizing different stages in the evolution of the intramontane quaternary fill. Lacustrine sediments belonging to the alloformation 2 and fluvial terraces corresponding to the alloformation 3 were dated in this contribution. According to the obtained ages the lacustrine episode would have begun in the early Holocene (8930 ± 50 AP) and continued at least by 2400 years (until 6,497 ± 45 AP). As a consequence of the damming break took place a large hiatus until the formation of the fluvial terraces corresponding to the alloformation 3 which were dated in 978 ± 20 AP and 525 ± 32 AP.

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How to Cite
Colombo, F., Limarino, C., Busquets, P., Solé de Porta, N., Heredia, N., Rodríguez Fernández, R. ., & Alvarez Marron, J. (2005). First absolute ages for Holoceno lacustrine deposits of the Jáchal river, Precordillera of San Juan. Revista De La Asociación Geológica Argentina, 60(3), 605-608. Retrieved from https://revista.geologica.org.ar/raga/article/view/1134
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