Late Quaternary alluvial fan evolution along the coast of the hyper-arid Atacama Desert - the interplay between climatic and tectonic control

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Title:Main Title: Late Quaternary alluvial fan evolution along the coast of the hyper-arid Atacama Desert - the interplay between climatic and tectonic control
Description:Abstract: Due to their sensitivity to both tectonic activity and climatic variations, coastal alluvial fans (CAF) along the western flank of the Coastal Cordillera in the Atacama Desert (northern Chile) are important geo-archives for unravelling Quaternary environmental change. Nevertheless, only limited chronological information is available for these deposits, which is important to understand the CAF evolution along a N-S gradient. To fill this gap, the present study aims to establish a chronostratigraphic framework for CAF located between ~20° and ~25°S by using a combination of post-infrared infrared (pIRIR) stimulated luminescence dating of K-feldspar and electron spin resonance (ESR) dating of quartz. Samples were taken from alluvial fan deposits, as well as from marine and aeolian sediments embedded in the CAF. First numerical ages derived from ESR and pIRIR methods are mostly in agreement at 1 sigma and are overall stratigraphically consistent along the sedimentary sequences. Age differences between the two methods have been observed in some alluvial fan deposits, which might be explained by the different bleaching kinetics of both pIRIR and ESR signals during short-term sheet- or debris-flow transport. An independent age control will be provided in the near future by cosmogenic nuclide exposure dating (10Be) of a wave-cut platform which is directly linked to the marine deposits below the CAF. First numerical dating of marine deposits yields burial ages of MIS 5e (~125 ka) as well as MIS 5c (~100 ka)/5a (~80 ka). These results give insights into the tectonic activity of the area during the Late Quaternary period, for which estimated uplift rates of ~0.3 m/ka have been derived. Aeolian sand interbeds in the CAF date to ~30 and ~45 ka, giving insights into the palaeoclimate and wind pattern in the study area during the Late Pleistocene. Short-term precipitation events led to high-energy debris flows at the western flank of the Coastal Cordillera, at least between ~30 and ~60 ka as well as around 15 ka. These first chronological information from the CAF indicate a heterogeneous climate evolution at the Pacific side of the Atacama Desert.
Responsible Party
Creators:Melanie Bartz (Author), Mathieu Duval (Author), Janek Walk (Author), Dominik Brill (Author), Anja Zander (Author), Georgina King (Author), Georg Stauch (Author), Frank Lehmkuhl (Author), Helmut Brückner (Author)
Funding Reference:Deutsche Forschungsgemeinschaft (DFG): CRC 1211: Earth - Evolution at the Dry Limit
Publisher:EGU
Publication Year:2019
Topic
CRC1211 Topic:Surface
Related Subproject:C2
Subjects:Keywords: Geochronology, Geomorphology, Luminescence Dating, Paleoclimate Proxies, Tectonics , Landscape Evolution
Geogr. Information Topic:Environment
File Details
Filename:EGU2019-10788.pdf
Data Type:Text - Event Paper
File Size:41 KB
Date:Submitted: 09.01.2019
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
Constraints
Download Permission:Free
General Access and Use Conditions:According to the CRC1211DB data policy agreement. © Author(s) 2019. CC Attribution 4.0 license.
Access Limitations:According to the CRC1211DB data policy agreement. © Author(s) 2019. CC Attribution 4.0 license.
Licence:[Creative Commons] Attribution 4.0 International (CC BY 4.0)
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Specific Information - Publication
Publication Status:Published
Review Status:Not peer reviewed
Publication Type:Event Paper
Proceedings Title:Geophysical Research Abstracts
Issue:EGU2019-10788
Volume:21
Number of Pages:1 (1 - 1)
Event:EGU General Assembly 2019
Event Type:Conference
Event Location:Vienna, Austria
Event Duration:7th of April, 2019 - 12th of April, 2019
Metadata Details
Metadata Creator:Janek Walk
Metadata Created:14.11.2019
Metadata Last Updated:14.11.2019
Subproject:C2
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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Dataset Downloads:3
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