Postglacial alluvial fan dynamics in the Cordillera Oriental, Peru, and palaeoclimatic implications

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dc.identifier.uri Ratnayaka, Kevin eng Hetzel, Ralf eng Hornung, Jens eng Hampel, Andrea eng Hinderer, Matthias eng Frechen, Manfred eng 2021-12-21T07:49:02Z 2021-12-21T07:49:02Z 2019
dc.identifier.citation Ratnayaka, K.; Hetzel, R.; Hornung, J.; Hampel, A.; Hinderer, M.; Frechen, M.: Postglacial alluvial fan dynamics in the Cordillera Oriental, Peru, and palaeoclimatic implications. In: Quaternary Research 91 (2019), Nr. 1, S. 431-449. DOI: eng
dc.description.abstract Alluvial fans record climate-driven erosion and sediment-transport processes and allow reconstructing past environmental conditions. Here we investigate the sedimentation history of two alluvial fans located in formerly glaciated valleys of the Cordillera Oriental, Peru. 10Be exposure ages from the fan surfaces and radiocarbon ages from the fan interiors constrain the final stages of fan formation. The 10Be and 14C ages cluster mainly between 13.3–9.3 ka and 11,500–9700 cal yr BP, respectively. Our age data set indicates that—after deglaciation—large amounts of fan sediment were deposited until ∼10 ka, when sedimentation rates declined rather abruptly. This pattern is supported by 10Be erosion rates for the fan catchments, because under the assumption of constant erosion the time needed to erode the material stored in the fans significantly exceeds their age. Correlating our ages with regional climate records indicates that precipitation exerts the primary control on fan sedimentation. Two periods with elevated lake levels and increased precipitation between 18 and 14.5 ka and from 13 to 11.5 ka resulted in rapid deposition of large fan lobes. Subsequently, lower precipitation rates decreased erosion in the catchments and sediment delivery to the fans, which have remained largely inactive since ∼9.5 ka. eng
dc.language.iso eng eng
dc.publisher Cambridge : Cambridge Univ. Press
dc.relation.ispartofseries Quaternary Research 91 (2019), Nr. 1 eng
dc.rights Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich. eng
dc.subject Alluvial fan eng
dc.subject Sedimentation rate eng
dc.subject Climate history eng
dc.subject 10Be exposure dating eng
dc.subject 14C dating eng
dc.subject Peru eng
dc.subject Andes eng
dc.subject.ddc 550 | Geowissenschaften eng
dc.title Postglacial alluvial fan dynamics in the Cordillera Oriental, Peru, and palaeoclimatic implications eng
dc.type Article eng
dc.type Text eng
dc.relation.essn 1096-0287
dc.relation.issn 0033-5894
dc.relation.doi 10.1017/qua.2018.106
dc.bibliographicCitation.firstPage 431
dc.bibliographicCitation.lastPage 449
dc.description.version publishedVersion eng
tib.accessRights frei zug�nglich eng

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