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A westerly wind dominated Puna Plateau during deposition of upper Pleistocene loessic sediments in the subtropical Andes, South America

Author

Listed:
  • Alex Pullen

    (Clemson University)

  • David L. Barbeau

    (University of South Carolina)

  • Andrew L. Leier

    (University of South Carolina)

  • Jordan T. Abell

    (University of Arizona)

  • Madison Ward

    (Clemson University)

  • Austin Bruner

    (Clemson University
    University of Kansas)

  • Mary Kate Fidler

    (Clemson University)

Abstract

The Tafí del Valle depression (~27° S) in the eastern Andes of Argentina provides a record of late Pleistocene dust deposition in the subtropics of South America. We present large-n U-Pb geochronology data for detrital zircons from upper Pleistocene loess-paleosol deposits. When compared to regional data, the age spectra from the Tafí del Valle samples are most like the southern Puna Plateau, supporting derivation largely from the west and northwest. This runs counter to hypotheses suggesting these loessic sediments were derived from the low elevation plains to the east or extra-Andean Patagonia. Mapping of linear wind erosion features on the Puna Plateau yield a mean orientation of 125.7° (1 s.d. = 12.4°). These new data and existing records are consistent with a westerly-northwesterly dominated (upper- and lower-level) wind system over the southern Puna Plateau (to at least ~27° S) during periods of high dust accumulation in Tafí del Valle.

Suggested Citation

  • Alex Pullen & David L. Barbeau & Andrew L. Leier & Jordan T. Abell & Madison Ward & Austin Bruner & Mary Kate Fidler, 2022. "A westerly wind dominated Puna Plateau during deposition of upper Pleistocene loessic sediments in the subtropical Andes, South America," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-31118-5
    DOI: 10.1038/s41467-022-31118-5
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    Cited by:

    1. Blake Stubbins & Andrew L. Leier & David L. Barbeau & Alex Pullen & Jordan T. Abell & Junsheng Nie & Marcelo A. Zárate & Mary Kate Fidler, 2023. "Global climate forcing on late Miocene establishment of the Pampean aeolian system in South America," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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