1887
Volume 25, Issue 6
  • E-ISSN: 1365-2117

Abstract

Abstract

Depositional models of ancient lakes in thin‐skinned retroarc foreland basins rarely benefit from appropriate Quaternary analogues. To address this, we present new stratigraphic, sedimentological and geochemical analyses of four radiocarbon‐dated sediment cores from the Pozuelos Basin (PB; northwest Argentina) that capture the evolution of this low‐accommodation Puna basin over the past . 43 cal kyr. Strata from the PB are interpreted as accumulations of a highly variable, underfilled lake system represented by lake‐plain/littoral, profundal, palustrine, saline lake and playa facies associations. The vertical stacking of facies is asymmetric, with transgressive and thin organic‐rich highstand deposits underlying thicker, organic‐poor regressive deposits. The major controls on depositional architecture and basin palaeogeography are tectonics and climate. Accommodation space was derived from piggyback basin‐forming flexural subsidence and Miocene‐Quaternary normal faulting associated with incorporation of the basin into the Andean hinterland. Sediment and water supply was modulated by variability in the South American summer monsoon, and perennial lake deposits correlate in time with several well‐known late Pleistocene wet periods on the Altiplano/Puna plateau. Our results shed new light on lake expansion–contraction dynamics in the PB in particular and provide a deeper understanding of Puna basin lakes in general.

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/content/journals/10.1111/bre.12025
2013-07-03
2020-05-29
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Crossplot of sedimentation rate (mm year−1) versus log time (years). Recent sedimentation rate data derived from radioisotopes are from McGlue . (2012a). Long‐term sedimentation rates were calculated using basal 14C ages and a constant rate of accumulation over the length of the dated interval (i.e. not including coarse‐grained basal units that lack direct age control). Compaction is assumed to be negligible. Average lacustrine sedimentation rate adapted from Cohen (2003). Late Quaternary rates suggest a punctuated stratal record, which is compatible with facies observations in Unit II.

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Shuttle Radar Topography Mission digital elevation model of tropical and sub tropical South America, illustrating the locations of several palaeolake basins mentioned in the text. 1, Salar de Hombre Muerto, Argentina. 2, Salar de Atacama, Chile. 3, Pozuelos Basin, Argentina. 4, Oligocene wedge‐top basins, Bolivia (Horton, 1998). 5, Salar de Uyuni, Bolivia. 6, Rio Desaguadero valley, Bolivia. 7, Lake Titicaca, Peru/Bolivia.

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Summary of core locations, lengths, and age ranges used in this study.

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Radiocarbon geochronology of cores collected from the Pozuelos Basin.

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Lithofacies encountered in Cores 2A, 3A, 4A and 6A. Note that elemental data for Facies B (marked by *) includes values previously published in McGlue . (2012a).

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  • Article Type: Research Article
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