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dc.contributor.author
Tofelde, Stefanie  
dc.contributor.author
Schildgen, Taylor F.  
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Savi, Sara  
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Pingel, Heiko  
dc.contributor.author
Wickert, Andrew D.  
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Bookhagen, Bodo  
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Wittmann, Hella  
dc.contributor.author
Alonso, Ricardo Narciso  
dc.contributor.author
Cottle, John  
dc.contributor.author
Strecker, Manfred R.  
dc.date.available
2019-07-04T16:24:37Z  
dc.date.issued
2017-09  
dc.identifier.citation
Tofelde, Stefanie; Schildgen, Taylor F.; Savi, Sara; Pingel, Heiko; Wickert, Andrew D.; et al.; 100 kyr fluvial cut-and-fill terrace cycles since the Middle Pleistocene in the southern Central Andes, NW Argentina; Elsevier Science; Earth and Planetary Science Letters; 473; 9-2017; 141-153  
dc.identifier.issn
0012-821X  
dc.identifier.uri
http://hdl.handle.net/11336/79138  
dc.description.abstract
Fluvial fill terraces in intermontane basins are valuable geomorphic archives that can record tectonically and/or climatically driven changes of the Earth-surface process system. However, often the preservation of fill terrace sequences is incomplete and/or they may form far away from their source areas, complicating the identification of causal links between forcing mechanisms and landscape response, especially over multi-millennial timescales. The intermontane Toro Basin in the southern Central Andes exhibits at least five generations of fluvial terraces that have been sculpted into several-hundred-meter-thick Quaternary valley-fill conglomerates. New surface-exposure dating using nine cosmogenic 10Be depth profiles reveals the successive abandonment of these terraces with a 100 kyr cyclicity between 75±7 and 487±34 ka. Depositional ages of the conglomerates, determined by four 26Al/10Be burial samples and U–Pb zircon ages of three intercalated volcanic ash beds, range from 18±141 to 936±170 ka, indicating that there were multiple cut-and-fill episodes. Although the initial onset of aggradation at ∼1 Ma and the overall net incision since ca. 500 ka can be linked to tectonic processes at the narrow basin outlet, the superimposed 100 kyr cycles of aggradation and incision are best explained by eccentricity-driven climate change. Within these cycles, the onset of river incision can be correlated with global cold periods and enhanced humid phases recorded in paleoclimate archives on the adjacent Bolivian Altiplano, whereas deposition occurred mainly during more arid phases on the Altiplano and global interglacial periods. We suggest that enhanced runoff during global cold phases – due to increased regional precipitation rates, reduced evapotranspiration, or both – resulted in an increased sediment-transport capacity in the Toro Basin, which outweighed any possible increases in upstream sediment supply and thus triggered incision. Compared with two nearby basins that record precessional (21-kyr) and long-eccentricity (400-kyr) forcing within sedimentary and geomorphic archives, the recorded cyclicity scales with the square of the drainage basin length.  
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
10be Depth-Profiles  
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Aggradation&Ndash;Incision Cycles  
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Eastern Cordillera  
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Glacial&Ndash;Interglacial Cycles  
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Landscape Response to Climate Change  
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Surface Inflation  
dc.subject.classification
Geociencias multidisciplinaria  
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Ciencias de la Tierra y relacionadas con el Medio Ambiente  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
100 kyr fluvial cut-and-fill terrace cycles since the Middle Pleistocene in the southern Central Andes, NW 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
2019-07-03T15:05:35Z  
dc.journal.volume
473  
dc.journal.pagination
141-153  
dc.journal.pais
Países Bajos  
dc.journal.ciudad
Amsterdam  
dc.description.fil
Fil: Tofelde, Stefanie. Universitat Potsdam; Alemania. Deutsches Geo Forschungs Zentrum; Alemania  
dc.description.fil
Fil: Schildgen, Taylor F.. Universitat Potsdam; Alemania. Deutsches Geo Forschungs Zentrum; Alemania  
dc.description.fil
Fil: Savi, Sara. Universitat Potsdam; Alemania  
dc.description.fil
Fil: Pingel, Heiko. Universitat Potsdam; Alemania  
dc.description.fil
Fil: Wickert, Andrew D.. University of Minnesota; Estados Unidos  
dc.description.fil
Fil: Bookhagen, Bodo. Universitat Potsdam; Alemania  
dc.description.fil
Fil: Wittmann, Hella. Deutsches Geo Forschungs Zentrum; Alemania  
dc.description.fil
Fil: Alonso, Ricardo Narciso. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Correlación Geológica. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Departamento de Geología. Cátedra Geología Estructural. Instituto Superior de Correlación Geológica; Argentina  
dc.description.fil
Fil: Cottle, John. University of California; Estados Unidos  
dc.description.fil
Fil: Strecker, Manfred R.. Universitat Potsdam; Alemania  
dc.journal.title
Earth and Planetary Science Letters  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1016/j.epsl.2017.06.001  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://linkinghub.elsevier.com/retrieve/pii/S0012821X17303102