[370] - Coupled controls of climate, geology, and biota on late Pleistocene alluvial fan morphodynamics along the coast of the hyperarid Atacama Desert

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Citation
Walk, J., Bartz, M., Stauch, G., Reyers, M., Binnie, S., Brill, D., Vásquez, P., Sepúlveda, F., Hoffmeister, D., Brückner, H., Lehmkuhl, F., 2020. Coupled controls of climate, geology, and biota on late Pleistocene alluvial fan morphodynamics along the coast of the hyperarid Atacama Desert. Geophysical Research Abstracts. Proc. of EGU2020: Sharing Geoscience Online, May 04 - 08, 2020, Vienna, Austria (online), 1 - 2.
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Identification
Title(s):Main Title: Coupled controls of climate, geology, and biota on late Pleistocene alluvial fan morphodynamics along the coast of the hyperarid Atacama Desert
Description(s):Abstract: I n the hyperarid environment of the Atacama Desert, alluvial fans are the principle fluvial geoarchive reflecting variations in climate and tectonics in their architecture. While they have been studied in the core of the desert to reconstruct long-term palaeoenvironmental changes from the Oligocene to the Quaternary and, in particular, to constrain the onset of hyperaridity, alluvial fans along the coast (20.5°S – 25.5°S) are younger and show a much higher activity; thus, they can serve as archives during the Pleistocene to Holocene evolution. However, past and recent morphodynamics of the coastal alluvial fans (CAF) are yet poorly reconstructed so that the understanding of an interplay between climatic, geologic, and biotic controls is still challenging. We related climatic, lithologic, and tectonic source-area characteristics to geomorphometric parameters of the CAF and their catchments. Geomorphometric analyses were conducted based on the 12.5 m TanDEM‑X WorldDEM™, lithological and tectonic data were extracted from regional geological maps, and the frequency of heavy rainfall events derived from a regional Weather Research and Forecasting (WRF) model was used as a climate parameter. We further combined luminescence dating, cosmogenic nuclide exposure dating, and existing chronological data to constrain the timing of Pleistocene alluvial fan deposition as well as the ages of interbedded marine terraces. Results indicate a primary climatic control on CAF dynamics shown in the functional relationships with catchment hydromorphometrics that mirror a high susceptibility to debris-flows as well as in the temporal pattern of CAF activity. Distinct phases of CAF activity occurred during the late Pleistocene (95–80 ka, 60–45 ka, and 35-20 ka) and the Holocene – driven by atmospheric changes from the Pacific Ocean. The primary source of precipitation is reflected along the latitudinal gradient: frontal systems and cut-off lows mainly originating from the extratropics. Towards the south, an increasing density of Loma vegetation can be observed so that also possible feedback mechanisms of biota on sediment supply need to be considered. While source-area lithology is of negligible relevance for CAF morphodynamics, an important long-term influence of tectonics can be seen in the regional uplift, which in turn controls the catchment shape and relief. From the numerical dating of the marine terraces, uplift rates ranging between ~0.06 and ~0.57 m/ka were derived for the late Pleistocene period.
Responsible Party
Creator(s):Author: Janek Walk
Author: Melanie Bartz
Author: Georg Stauch
Author: Mark Reyers
Author: Steven Binnie
Author: Dominik Brill
Author: Paulina Vásquez
Author: Fernando Sepúlveda
Author: Dirk Hoffmeister
Author: Helmut Brückner
Author: Frank Lehmkuhl
Funding Reference(s):Deutsche Forschungsgemeinschaft (DFG): CRC 1211: Earth - Evolution at the Dry Limit
Publisher:EGU
Topic
CRC1211 Topic:Surface
Related Sub-project(s):C2
Subject(s):CRC1211 Keywords: Geomorphology, Landscape Evolution, Remote Sensing, Geochronology, Climate Models, Arid Zone
Topic Category:Environment
File Details
File Name:Walk_et_al_2020_EGU2020-7461.pdf
Data Type:Text
File Size:294 kB (0.287 MB)
Date(s):Date Submitted: 2020-01-14
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) 2020. CC Attribution 4.0 license.
Access Limitations:According to the CRC1211DB data policy agreement. © Author(s) 2020. CC Attribution 4.0 license.
Licence:Creative Commons Attribution 4.0 International (CC BY 4.0)
Geographic
North:-20.19104
East:-69.96429
South:-24.99699
West:-70.68939
Measurement Region:Chile
Measurement Location:--Chile--
Specific Informations - Publication
Status:Published
Review:NoPeerReview
Year:2020
Type:Event Paper
Proceedings Title:Geophysical Research Abstracts
Number Of Pages:2
Page Range:1 - 2
Event Name:EGU2020: Sharing Geoscience Online
Event Type:Conference
Event Location:Vienna, Austria (online)
Event Period:4th of May, 2020 - 8th of May, 2020
Metadata Details
Metadata Creator:Janek Walk
Metadata Created:2020-04-08
Metadata Last Updated:2020-04-08
Subproject:C2
Funding Phase:1
Metadata Language:English
Metadata Version:V43
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