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: Cosmogenic nuclide exposure dating of ancient extensive alluvial fan surfaces and fluvial features in the hyperarid coastal Atacama Desert provide new insights about the onset and variability of aridity. Depositional systems in the Coastal Cordillera are significantly influenced by tectonic activity, creating sedimentation space, re-arranging drainage pathways and protecting fluvial depositional fan surfaces from subsequent burial or erosion. The predominantly (hyper-) arid conditions help to preserve evidence for climatic variation and/or slow tectonic changes. Applying single clast 10Be and 21Ne terrestrial cosmogenic nuclide (TCN) dating, we find evidence for episodes of enhanced fluvial erosion and deposition at prior to 19 Ma, and 12 Ma, and around 8-9 Ma. Fluvial modification of surfaces essentially ceased 2-2.5 Ma ago. The presence of pre-Miocene clast ages (two clasts with 29 Ma and 35 Ma old ages) points to slow or stagnant landscape development during the Oligocene. Our data implies the 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 interpretations by others, favouring 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), Steven Binnie (Author), Finlay Stuart (Author), Axel Gerdes (Author), Volker Wennrich (Author), Tibor Dunai (Author)
Publisher:EGU General Assembly 2018
Publication Year:2019
Topic
CRC1211 Topic:Dating
Related Subprojects:D1, A2
Subjects:Keywords: Cosmogenic Nuclides, Geomorphology
File Details
Filename:EGU2018_B.Ritter_Abstract.pdf
Data Type:Text - Event Paper
File Size:37 KB
Date:Available: 08.04.2018
Mime Type:application/pdf
Language:English
Status:Completed
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Download Permission:Free
General 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Review Status:Not peer reviewed
Publication Type:Event Paper
Number of Pages:1 (1 - 1)
Event:EGU General Assembly 2018
Event Type:Conference
Event Location:Vienna
Event Duration:8th of April, 2018 - 13th of April, 2018
Metadata Details
Metadata Creator:Benedikt Ritter
Metadata Created:26.06.2019
Metadata Last Updated:26.06.2019
Subproject:D1
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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Dataset Downloads:6
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