Journal of Paleolimnology

, Volume 20, Issue 4, pp 353–368 | Cite as

Post-Wisconsinian paleoenvironments at Salinas del Bebedero basin, San Luis, Argentina

  • Miguel A. González
  • Nora I. Maidana
Article

Abstract

We present a climatic reconstruction of Holocene lacustrine episodes in the Salinas del Bebedero basin (Argentina), based on geological and diatom information.

Morphological, sedimentological and diatom evidence between 11600 ± 140 yr BP and 325 ± 95 yr BP, allowed us to interpret the paleoenvironments of the basin. Episodes of high energy (sandy levels) are linked to large inflow of meltwater through the Desaguadero River, related to development of glaciers on the Andes. This inflow is characterized by peaks of relative abundance of the brackish water diatom Cyclotella choctawatcheeana Prasad. The values of C. choctawatcheeana decrease in deposits of low energy (clay levels), where it co-dominates with oligohalobous Fragilaria and Epithemia spp.

To the last two peaks of large inflow of meltwater, radiocarbon dates corrected to sidereal ages, are AD 1280/1420 and AD 1443/1656. These ages agree with two cold episodes clearly recorded in dendrological studies from the Patagonian Andes and were correlated to the Little Ice Age. Thus, older Holocene episodes of large inflow of water to the basin were correlated with the Neoglacial Advances defined by Mercer (1976) for the Andes.

Argentina Holocene paleolimnology diatom assemblages paleoclimatology paleoenvironments brackish water 

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Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • Miguel A. González
    • 1
  • Nora I. Maidana
    • 2
  1. 1.CONICET, Servicio Geológico Minero Argentino and Carl C:Zon Caldenius FoundationBuenos AiresArgentina
  2. 2.Dpto. de Biologí, Fac. de CsUniversidad de Buenos Aires and CONICETBuenos AiresArgentina

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