Universität zu Köln

Schildgen, Taylor F., Robinson, Ruth A. J., Savi, Sara, Phillips, William M., Spencer, Joel Q. G., Bookhagen, Bodo ORCID: 0000-0003-1323-6453, Scherler, Dirk ORCID: 0000-0003-3911-2803, Tofelde, Stefanie, Alonso, Ricardo N., Kubik, Peter W., Binnie, Steven A. and Strecker, Manfred R. (2016). Landscape response to late Pleistocene climate change in NW Argentina: Sediment flux modulated by basin geometry and connectivity. J. Geophys. Res.-Earth Surf., 121 (2). S. 392 - 415. WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 2169-9011

Full text not available from this repository.

Abstract

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 Be-10 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 Be-10 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schildgen, Taylor F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Robinson, Ruth A. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Savi, Sara UNSPECIFIED UNSPECIFIED UNSPECIFIED Phillips, William M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Spencer, Joel Q. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bookhagen, Bodo UNSPECIFIED orcid.org/0000-0003-1323-6453 UNSPECIFIED Scherler, Dirk UNSPECIFIED orcid.org/0000-0003-3911-2803 UNSPECIFIED Tofelde, Stefanie UNSPECIFIED UNSPECIFIED UNSPECIFIED Alonso, Ricardo N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kubik, Peter W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Binnie, Steven A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Strecker, Manfred R. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-285094
DOI:	10.1002/2015JF003607
Journal or Publication Title:	J. Geophys. Res.-Earth Surf.
Volume:	121
Number:	2
Page Range:	S. 392 - 415
Date:	2016
Publisher:	AMER GEOPHYSICAL UNION
Place of Publication:	WASHINGTON
ISSN:	2169-9011
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SITU-PRODUCED BE-10; EROSION RATES; SOUTHERN PERU; PUNA PLATEAU; RAINFALL VARIABILITY; GARHWAL HIMALAYA; COSMOGENIC BE-10; DENUDATION RATES; ATACAMA DESERT; PISCO VALLEY Multiple languages Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/28509