Universität zu Köln

Ritter, Benedikt, Stuart, Finlay M., Binnie, Steven A., Gerdes, Axel ORCID: 0000-0003-3823-2125, Wennrich, Volker ORCID: 0000-0003-3617-1963 and Dunai, Tibor J. (2018). Neogene fluvial landscape evolution in the hyperarid core of the Atacama Desert. Sci Rep, 8. LONDON: NATURE PUBLISHING GROUP. ISSN 2045-2322

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Abstract

Dating of extensive alluvial fan surfaces and fluvial features in the hyperarid core of the Atacama Desert, Chile, using cosmogenic nuclides provides unrivalled insights about the onset and variability of aridity. The predominantly hyperarid conditions help to preserve the traces of episodic climatic and/or slow tectonic change. Utilizing single clast exposure dating with cosmogenic Be-10 and Ne-21, we determine the termination of episodes of enhanced fluvial erosion and deposition occurring at similar to 19, similar to 14, similar to 9.5 Ma; large scale fluvial modification of the landscape had ceased by similar to 2-3 Ma. The presence of clasts that record pre-Miocene exposure ages (similar to 28 Ma and similar to 34 Ma) require stagnant landscape development during the Oligocene. Our data implies an early onset of (hyper-) aridity in the core region of the Atacama Desert, interrupted by wetter but probably still arid periods. The apparent conflict with interpretation that favour a later onset of (hyper-) aridity can be reconciled when the climatic gradients within the Atacama Desert are considered.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Ritter, Benedikt UNSPECIFIED UNSPECIFIED UNSPECIFIED Stuart, Finlay M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Binnie, Steven A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gerdes, Axel UNSPECIFIED orcid.org/0000-0003-3823-2125 UNSPECIFIED Wennrich, Volker UNSPECIFIED orcid.org/0000-0003-3617-1963 UNSPECIFIED Dunai, Tibor J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-172701
DOI:	10.1038/s41598-018-32339-9
Journal or Publication Title:	Sci Rep
Volume:	8
Date:	2018
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	2045-2322
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PORPHYRY COPPER-DEPOSITS; CHILEAN FORE-ARC; NORTHERN CHILE; CLIMATE-CHANGE; COSMOGENIC HE-3; SUPERGENE ENRICHMENT; EXPOSURE AGES; CENTRAL ANDES; FAULT SYSTEM; MIOCENE AGE Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/17270