Global climate forcing on late Miocene establishment of the Pampean aeolian system in South America

Blake Stubbins, Andrew L. Leier, David L. Barbeau, Alex Pullen (), Jordan T. Abell, Junsheng Nie, Marcelo A. Zárate and Mary Kate Fidler
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Blake Stubbins: University of South Carolina
Andrew L. Leier: University of South Carolina
David L. Barbeau: University of South Carolina
Alex Pullen: Clemson University
Jordan T. Abell: University of Arizona
Junsheng Nie: Lanzhou University
Marcelo A. Zárate: CONICET Universidad Nacional de La Pampa
Mary Kate Fidler: Clemson University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Wind-blown dust from southern South America links the terrestrial, marine, atmospheric, and biological components of Earth’s climate system. The Pampas of central Argentina (~33°–39° S) contain a Miocene to Holocene aeolian record that spans an important interval of global cooling. Upper Miocene sediment provenance based on n = 3299 detrital-zircon U-Pb ages is consistent with the provenance of Pleistocene–Holocene deposits, indicating the Pampas are the site of a long-lived fluvial-aeolian system that has been operating since the late Miocene. Here, we show the establishment of aeolian sedimentation in the Pampas coincided with late Miocene cooling. These findings, combined with those from the Chinese Loess Plateau (~33°–39° N) underscore: (1) the role of fluvial transport in the development and maintenance of temporally persistent mid-latitude loess provinces; and (2) a global-climate forcing mechanism behind the establishment of large mid-latitude loess provinces during the late Miocene.

Date: 2023
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DOI: 10.1038/s41467-023-42537-3

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