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- Title
Global climate forcing on late Miocene establishment of the Pampean aeolian system in South America.
- Authors
Stubbins, Blake; Leier, Andrew L.; Barbeau Jr., David L.; Pullen, Alex; Abell, Jordan T.; Nie, Junsheng; Zárate, Marcelo A.; Fidler, Mary Kate
- 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. Wind-blown dust accumulation in central South America began during a period of global cooling and has persisted for millions of years. This corresponds with the expansion of the Chinese Loess Plateau and is consistent with bihemispheric forcing.
- Subjects
PAMPAS (Argentina); SOUTH America; ARGENTINA; MIOCENE Epoch; PROVENANCE (Geology); PALEOGEOGRAPHY; GLOBAL cooling; SEDIMENTATION &; deposition
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-42537-3