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dc.contributor.author
Tripaldi, Alfonsina  
dc.contributor.author
Forman, Steven L.  
dc.date.available
2019-05-13T20:00:38Z  
dc.date.issued
2007-08  
dc.identifier.citation
Tripaldi, Alfonsina; Forman, Steven L.; Geomorphology and chronology of Late Quaternary dune fields of western Argentina; Elsevier Science; Palaeogeography, Palaeoclimatology, Palaeoecology; 251; 2; 8-2007; 300-320  
dc.identifier.issn
0031-0182  
dc.identifier.uri
http://hdl.handle.net/11336/76199  
dc.description.abstract
Stabilized dune fields are common in western Argentina and potentially reflect drought variability in the Late Quaternary. This study focussed on deciphering geomorphic and stratigraphic record of three vegetated dune fields from east to west, San Luis, Médanos Negros and Médanos Grandes, with a mean annual precipitation from ∼ 700 to 91 mm. Optically stimulated luminescence single-aliquot regeneration protocols yield ages on eolian quartz grains, constraining depositional events. The San Luis dune field, the wettest area, exhibits evidence for repeated activation during the last glaciation, ca. 33-20 ka, generally coincident with regional loess deposition These dunes were locally reformed in the past 100 years which is apparently coincident with intensified agrarian use and drying in the late 19th and early 20th century. The two driest and western-most dune fields, Médanos Negros and Médanos Grandes, show reactivation at ca. 2.5 ka 0.9 and 0.5 ka; and ca. 4.3-4, 2.1 and 0.6-0.4 ka, respectively. Eolian depositional events at ca. 2.5-2.1 ka and 0.6-0.4 ka may be coeval for Médanos Grandes and Negros dune fields. Sustained drought conditions conducive for eolian activity is associated with warmer sea surface temperatures in the South Atlantic, a weakened South American Convergent Zone and a dispersed and southeasterly flow of tropical moisture from the Low Level Chaco Jet. This nascent analysis indicates drought variability beyond historic observations with potentially at least four dune reactivation events in the past ca. 4.5 ka.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Elsevier Science  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Argentina  
dc.subject
Climate Variability  
dc.subject
Dune Fields  
dc.subject
Eolian  
dc.subject.classification
Meteorología y Ciencias Atmosféricas  
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente  
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS  
dc.title
Geomorphology and chronology of Late Quaternary dune fields of western Argentina  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2019-05-02T17:55:48Z  
dc.journal.volume
251  
dc.journal.number
2  
dc.journal.pagination
300-320  
dc.journal.pais
Países Bajos  
dc.journal.ciudad
Amsterdam  
dc.description.fil
Fil: Tripaldi, Alfonsina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina  
dc.description.fil
Fil: Forman, Steven L.. University of Illinois; Estados Unidos  
dc.journal.title
Palaeogeography, Palaeoclimatology, Palaeoecology  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.palaeo.2007.04.007  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0031018207002350