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dc.contributor.author
Garzanti, Eduardo
dc.contributor.author
Capaldi, Tomas
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Tripaldi, Alfonsina
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dc.contributor.author
Zárate, Marcelo Arístides
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dc.contributor.author
Limonta, Mara
dc.contributor.author
Vezzoli, Giovanni
dc.date.available
2023-07-07T11:25:40Z
dc.date.issued
2022-08
dc.identifier.citation
Garzanti, Eduardo; Capaldi, Tomas; Tripaldi, Alfonsina; Zárate, Marcelo Arístides; Limonta, Mara; et al.; Andean retroarc-basin dune fields and Pampean Sand Sea (Argentina): Provenance and drainage changes driven by tectonics and climate; Elsevier Science; Earth-science Reviews; 231; 8-2022; 1-25
dc.identifier.issn
0012-8252
dc.identifier.uri
http://hdl.handle.net/11336/202676
dc.description.abstract
We here review in terms of tectono-magmatic setting and Quaternary landscape dynamics what is known about the provenance of Argentine dune fields and their fluvial feeder systems draining the Andean Cordillera. The detrital signatures of these eolian sediments were previously investigated based on either framework petrography and heavy minerals or detrital-zircon geochronology, and their peculiar volcaniclastic nature was long recognized. Compositional variability, however, was only broadly evaluated, and quantitative provenance analysis based on a systematic multimethod approach across the entire region was not carried out so far. For this reason, here we integrate original and previously obtained petrographic, heavy-mineral, and detrital-zircon geochronology data to present the first comprehensive provenance study of dune fields stretching for 1000 km across central Argentina from the Andean piedmont to the Atlantic Ocean. In dune fields along the Andean retroarc basin, sediment composition defines a steady northward decrease in volcanic detritus. This reflects active magmatism in the Southern Volcanic Zone and Payenia province (38°-34°S), in contrast with the ~600-km-long Pliocene-Quaternary magmatic gap in the Pampean flat-slab segment (33°-27°S), where sediment is derived from deeper-seated tectono-stratigraphic levels of the continental arc and uplifted blocks of retroarc-basin basement. In distal Pampean lowlands extending across the bulge and backbulge depozones, instead, sand dunes display notably homogeneous compositional signatures, indicating that detritus was mostly generated north of 34°S and transported by a paleo-Desaguadero trunk river that formed during southward-progressing diachronous uplift of the Sierras Pampeanas since the late Miocene. In contrast with huge African and Arabian deserts that contain multiply recycled quartzose to pure quartzose sand, even very fragile volcanic clasts, plagioclase feldspar, and unstable ferromagnesian minerals are widespread, testifying to largely first-cycle volcanic provenance and only minor effects of mechanical breakdown and chemical weathering in the Pampean Sand Sea. During the Late Pleistocene, after a first southward shift of the Desaguadero trunk river possibly induced by increased water and sediment discharge at the end of the penultimate glacial maximum, tectonic uplift eventually outpaced stream power during the last glacial period. Paleo-rivers were thus forced to shift farther southwards, leading to the formation of an integrated paleo-Desaguadero+Colorado drainage system. During the latest Pleistocene-early Holocene, such a large trunk river fostered the rapid progradation of a wide delta and littoral sand transport all along the shores of the Buenos Aires Province. Climate change and repeated waxing and waning of glaciers through the Quaternary have left a prominent mark on sediment distribution, dominated by fluvial processes during periods of high fluvial discharge but alternating with arid phases characterized by limited transport capacity and vegetation cover, extensive wind deflation of floodplains, and sand accumulation in the dune fields.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
ARGENTINA
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BROKEN RETROARC BASIN
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DESAGUADERO AND COLORADO RIVERS
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DETRITAL ZIRCON GEOCHRONOLOGY
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HEAVY MINERALS
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LANDSCAPE CHANGES
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PAMPEAN DUNE FIELDS
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QUATERNARY CLIMATE
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SEDIMENTARY PETROLOGY
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Geología
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Andean retroarc-basin dune fields and Pampean Sand Sea (Argentina): Provenance and drainage changes driven by tectonics and climate
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2023-07-05T12:10:26Z
dc.journal.volume
231
dc.journal.pagination
1-25
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Garzanti, Eduardo. Università degli Studi di Milano; Italia
dc.description.fil
Fil: Capaldi, Tomas. University of Nevada; Estados Unidos
dc.description.fil
Fil: Tripaldi, Alfonsina. Universidad de Buenos Aires; Argentina. 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: Zárate, Marcelo Arístides. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; Argentina
dc.description.fil
Fil: Limonta, Mara. Università degli Studi di Milano; Italia
dc.description.fil
Fil: Vezzoli, Giovanni. Università degli Studi di Milano; Italia
dc.journal.title
Earth-science Reviews
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.earscirev.2022.104077
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