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Tectonic and climatic controls on the late Pleistocene to Holocene evolution of Paleolake Ullum-Zonda in the Precordillera of the central Andes, Argentina

Published online by Cambridge University Press:  01 August 2017

Pablo A. Blanc  and
Laura P. Perucca
Pablo A. Blanc*
Affiliation:
Gabinete de Neotectónica y Geomorfología, INGEO-FCEFN, Universidad Nacional de San Juan, Av. Ignacio de La Roza 590, CP 5400 San Juan, Argentina CIGEOBIO-CONICET, Av. Ignacio de La Roza 590, CP 5400 San Juan, Argentina
Laura P. Perucca
Affiliation:
Gabinete de Neotectónica y Geomorfología, INGEO-FCEFN, Universidad Nacional de San Juan, Av. Ignacio de La Roza 590, CP 5400 San Juan, Argentina CIGEOBIO-CONICET, Av. Ignacio de La Roza 590, CP 5400 San Juan, Argentina
*
*Corresponding author at: CIGEOBIO-CONICET, Av. Ignacio de La Roza 590, CP 5400 San Juan, Argentina. E-mail address: [email protected] (P.A. Blanc).
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Abstract

The Ullum-Zonda tectonic depression located in the central Andes Precordillera records several lacustrine episodes from frequent natural damming of the San Juan River during the late Quaternary. We analyzed stratigraphic, geomorphic, and geologic data and obtained new radiocarbon ages for Paleolake Ullum-Zonda. Results show the existence of a late Pleistocene age (16.7–15.2 ka BP) unit and an early to middle Holocene (9475–7685 yr BP) unit. Subsurface data show lacustrine episodes were common during the late Pleistocene, with probably nine episodes occurring during that period. Two transgressive events are evident in the Holocene unit, dated to ~8420±30 and shortly after 7460±30 14C yr BP. The maximum extent of the paleolake occurred at 6930±30 14C yr BP, shortly before the lake desiccated. Fault propagation folds and growth strata in Quaternary alluvial deposits relate to the Villicum-Zonda Fault and may indicate early to middle Holocene activity for this fault. The deformation observed in an ancient shoreline of the paleolake could be related to middle to late Holocene activity of the Cerro Zonda Norte Fault at a mean vertical uplift rate of ~0.8 mm/yr in the hanging wall block.

Keywords

San Juan RiverUllumZondaPrecordilleraLacustrinePaleoclimateNeotectonic
Type
Research Article
Information
Quaternary Research , Volume 88 , Issue 2 , September 2017 , pp. 248 - 264
Copyright
Copyright © University of Washington. Published by Cambridge University Press, 2017 

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