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| Titel |
Late Glacial–Holocene climatic transition record at the Argentinian Andean piedmont between 33 and 34° S |
| VerfasserIn |
A. E. Mehl, M. A. Zárate |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 10, no. 2 ; Nr. 10, no. 2 (2014-04-30), S.863-875 |
| Datensatznummer |
250116958
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| Publikation (Nr.) |
 copernicus.org/cp-10-863-2014.pdf |
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| Zusammenfassung |
The Arroyo La Estacada (~ 33°28' S,
69°02' W), eastern Andean piedmont of Argentina, cuts
through an extensive piedmont aggradational unit composed of a dominant Late
Pleistocene–early Holocene (LP–EH) alluvial sequence that includes several
paleosols.
One of these paleosols developed affecting the topmost part of likely
Late Glacial aeolian deposits aggraded into a floodplain environment by the
end of the Late Pleistocene. The paleosol shows variable grade of
development along the arroyo outcrops. Organic matter humification,
carbonate accumulation and redox processes were the dominant processes
associated with paleosol formation. By the early Holocene, when the
formation of the paleosol ended, renewed alluvial aggradation and high
magnitude flooding events affected the arroyo's floodplain environment. Accordignly,
a period of relative landscape stability in the Arroyo La Estacada basin is
inferred from the paleosol developed by the LP–EH transition in response to
the climatic conditions in the Andes cordillera piedmont after the
Late Glacial arid conditions. The analyzed Late Glacial–Holocene alluvial record of the Andean
piedmont constitutes a suitable record of the LP–EH climatic transition in
the extra-Andean region of Argentina. It is in agreement with regional
paleoclimatic evidence along the southern tip of the South American
continent, where other pedosedimentary sequences record similar late
Quaternary paleoenvironmental changes over both fluvial and interfluvial
areas. |
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