Neogene fluvial landscape evolution in the hyperarid core of the Atacama Desert

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Title:Main Title: Neogene fluvial landscape evolution in the hyperarid core of the Atacama Desert
Description: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 10Be and 21Ne, we determine the termination of episodes of enhanced fluvial erosion and deposition occurring at ~19, ~14, ~9.5 Ma; large scale fluvial modification of the landscape had ceased by ~2–3 Ma. The presence of clasts that record pre-Miocene exposure ages (~28 Ma and ~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.
Responsible Party
Creators:Benedikt Ritter (Author), Finlay Stuart (Author), Steven Binnie (Author), Axel Gerdes (Author), Volker Wennrich (Author), Tibor Dunai (Author)
Publisher:Nature Scientific Reports
Publication Year:2019
Topic
CRC1211 Topic:Dating
Related Subprojects:D1, A2
Subjects:Keywords: Cosmogenic Nuclides, Geochronology, Geomorphology, Tectonics
File Details
Filename:Ritter_et_al-2018b-Scientific_Reports.pdf
Data Type:Text - Article
File Size:9.9 MB
Date:Available: 17.09.2018
Mime Type:application/pdf
Language:English
Status:Completed
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Download Permission:Free
Access and Use Conditions:According to the CRC1211DB data policy agreement.
Access Limitations:According to the CRC1211DB data policy agreement.
Licence:None
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Publication Status:Accepted
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Nature Scientific Reports
Number of Pages:16 (1 - 16)
Metadata Details
Metadata Creator:Benedikt Ritter
Metadata Created:20.06.2019
Metadata Last Updated:20.06.2019
Subproject:D1
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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Dataset Downloads:7
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