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Abstract:

The Andean piedmont of Mendoza is a semiarid region covered by extensive and partially vegetated dune fields consisting of mostly inactive aeolian landforms of diverse size and morphology. This paper is focused on the San Rafael plain (SRP) environment, situated in the distal Andean piedmont of Mendoza (34° 30'S), and reports the sedimentology and OSL chronology of two representative exposures of late Quaternary deposits, including their paleoenvironmental and paleoclimatic significance. Eleven facies, including channel, floodplain, fluvio-aeolian interaction, and reworked pyroclastic and aeolian deposits, were described and grouped into two facies associations (FA1 and FA2). FA1 was formed by unconfined sheet flows, minor channelized streams and fluvial-aeolian interaction processes. FA2 was interpreted as aeolian dune and sand-sheet deposits. OSL chronology from the SRP sedimentary record indicates that between ca. 58-39. ka and ca. 36-24. ka (MIS 3), aggradation was governed by ephemeral fluvial processes (FA1) under generally semiarid conditions. During MIS 2, the last glacial maximum (ca. 24-12. ka), a major climatic shift to more arid conditions is documented by significant aeolian activity (FA2) that became the dominant sedimentation process north of the Diamante-Atuel fluvial system. The inferred paleoenvironmental conditions from the SRP sections are in broad agreement with regional evidence. © 2011 University of Washington.

Registro:

Documento: Artículo
Título:Late Quaternary paleoenvironments and paleoclimatic conditions in the distal Andean piedmont, southern Mendoza, Argentina
Autor:Tripaldi, A.; Zárate, M.A.; Brook, G.A.; Li, G.-Q.
Filiación:Dept. of Geology, CONICET, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires C1428EHA, Argentina
INCITAP CONICET, Universidad Nacional de La Pampa, Avenida Uruguay 151, Santa Rosa, 6300 La Pampa, Argentina
Department of Geography, University of Georgia, Athens, GA 30602, United States
Center for Arid Environment and Paleoclimate Research (CAEP), MOE Key Laboratory of West China's Environmental System, Lanzhou University, 222 Tianshuinanlu, Lanzhou, Gansu 730000, China
Palabras clave:Aeolian dunes; Andean piedmont; Argentina; Ephemeral streams; Last interglacial; Luminescence ages; Aeolian dunes; Andean piedmont; Argentina; Ephemeral streams; Last interglacial; Arid regions; Association reactions; Deposits; Rivers; Sedimentation; Sedimentology; Landforms; aggradation; climate conditions; dune field; eolian deposit; ephemeral stream; facies analysis; geochronology; Last Glacial Maximum; Last Interglacial; luminescence dating; paleoclimate; paleoenvironment; Quaternary; sedimentation; sedimentology; semiarid region; Argentina; Mendoza
Año:2011
Volumen:76
Número:2
Página de inicio:253
Página de fin:263
DOI: http://dx.doi.org/10.1016/j.yqres.2011.06.008
Título revista:Quaternary Research
Título revista abreviado:Quat. Res. (USA)
ISSN:00335894
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00335894_v76_n2_p253_Tripaldi

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Citas:

---------- APA ----------
Tripaldi, A., Zárate, M.A., Brook, G.A. & Li, G.-Q. (2011) . Late Quaternary paleoenvironments and paleoclimatic conditions in the distal Andean piedmont, southern Mendoza, Argentina. Quaternary Research, 76(2), 253-263.
http://dx.doi.org/10.1016/j.yqres.2011.06.008
---------- CHICAGO ----------
Tripaldi, A., Zárate, M.A., Brook, G.A., Li, G.-Q. "Late Quaternary paleoenvironments and paleoclimatic conditions in the distal Andean piedmont, southern Mendoza, Argentina" . Quaternary Research 76, no. 2 (2011) : 253-263.
http://dx.doi.org/10.1016/j.yqres.2011.06.008
---------- MLA ----------
Tripaldi, A., Zárate, M.A., Brook, G.A., Li, G.-Q. "Late Quaternary paleoenvironments and paleoclimatic conditions in the distal Andean piedmont, southern Mendoza, Argentina" . Quaternary Research, vol. 76, no. 2, 2011, pp. 253-263.
http://dx.doi.org/10.1016/j.yqres.2011.06.008
---------- VANCOUVER ----------
Tripaldi, A., Zárate, M.A., Brook, G.A., Li, G.-Q. Late Quaternary paleoenvironments and paleoclimatic conditions in the distal Andean piedmont, southern Mendoza, Argentina. Quat. Res. (USA). 2011;76(2):253-263.
http://dx.doi.org/10.1016/j.yqres.2011.06.008