Landscape response to late Pleistocene climate change in NW Argentina: Sediment flux modulated by basin geometry and connectivity | Land Portal | Securing Land Rights Through Open Data

Resource information

Date of publication: 
May 2017
Resource Language: 
ISBN / Resource ID: 
LaReferencia:AR_e7c5ebdf0b6ae1425241a42a8fc5bfa8
Copyright details: 
info:eu-repo/semantics/openAccess : Open Access, this refers to access without restrictions, and without financial incentives. Access to the resource is gained directly, without any obstacles.

Fluvial fill terraces preserve sedimentary archives of landscape responses to climate change, typically over millennial timescales. In the Humahuaca Basin of NW Argentina (Eastern Cordillera, southern Central Andes), our 29 new optically stimulated luminescence ages of late Pleistocene fill terrace sediments demonstrate that the timing of past river aggradation occurred over different intervals on the western and eastern sides of the valley, despite their similar bedrock lithology, mean slopes, and precipitation. In the west, aggradation coincided with periods of increasing precipitation, while in the east, aggradation coincided with decreasing precipitation or more variable conditions. Erosion rates and grain size dependencies in our cosmogenic 10Be analyses of modern and fill terrace sediments reveal an increased importance of landsliding compared to today on the west side during aggradation, but of similar importance during aggradation on the east side. Differences in the timing of aggradation and the 10Be data likely result from differences in valley geometry, which causes sediment to be temporarily stored in perched basins on the east side. It appears as if periods of increasing precipitation triggered landslides throughout the region, which induced aggradation in the west, but blockage of the narrow bedrock gorges downstream from the perched basins in the east. As such, basin geometry and fluvial connectivity appear to strongly influence the timing of sediment movement through the system. For larger basins that integrate subbasins with differing geometries or degrees of connectivity (like Humahuaca), sedimentary responses to climate forcing are likely attenuated.

Authors and Publishers

Author(s), editor(s), contributor(s): 
Schildgen, Taylor F Robinson, Ruth A. J. Savi, Sara Phillips, William M. Spencer, Joel Q. G. Bookhagen, Bodo Scherler, Dirk Tofelde, Stefanie Alonso, Ricardo Narciso Kubik, Peter W. Binnie, Steven A. Strecker, Manfred R.

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The Federated Network of Institutional Repositories of Scientific Publications (Red Federada de Repositorios Institucionales de Publicaciones Científicas), or simply LA Referencia, is a Latin American network of open access repositories. Through its services, it supports national Open Access strategies in Latin America through a platform with interoperability standards, sharing and giving visibility to the scientific production generated in institutions of higher education and scientific research.

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