Shaping the Huara Intrusive Complex in the Hyperarid Atacama Desert—Erosional Near-Stasis Contrasting High Topographic Gradients

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Title:Main Title: Shaping the Huara Intrusive Complex in the Hyperarid Atacama Desert—Erosional Near-Stasis Contrasting High Topographic Gradients
Description:Abstract: The Atacama Desert is one of the driest and oldest deserts on Earth, with extremely low precipitation rates (<2 mm/yr). Mostly abiotic hyperarid environmental conditions prevail, and surface processes act at extremely low rates over the long-term. To gain knowledge about the rate of surface processes and age of landscapes in desert environments, terrestrial cosmogenic nuclide derived erosion rate estimates can be used. Within the Huara Intrusive Complex, situated in the hyperarid core of the Atacama Desert, basin-averaged bedrock erosion rates from channel sediments are extremely low, that is, less than 1 m/Myr. Such low rates indicate that fluvial processes operate very slowly or are almost absent. Bedrock erosion rates of channel knickpoints, however, reveal one to two orders of magnitude higher erosion rates (2–12 m/Myr). Erosion rates are remarkably low when compared to the steep surrounding topography. Tectonic uplift creates higher gravitational potentials for surface processes, controlling the overall erosion rate capacity. However, erosion itself is taking place by local precipitation capable of exceeding thresholds for surface activity. In the Atacama Desert, this happens only due to rare severe precipitation events, explaining the extremely low erosion rates. The efficiency of these events is modulated by local intrinsic processes and conditions, such as high infiltration capacities of Atacama soils and/or large channel boulder accumulations. Due to the virtual absence of these precipitation events capable of erosion, the landscape appears to be in hibernation.
Responsible Party
Creators:Benedikt Ritter (Author), Joel Mohren (Author), Steven Binnie (Author), Volker Wennrich (Author), István Dunkl (Author), Richard Albert Roper (Author), Axel Gerdes (Author), Sandro Lobue (Author), Tibor Dunai (Author)
Publisher:JGR Earth Surface - Wiley
Publication Year:2023
CRC1211 Topic:Surface
Related Subproject:C4
Subjects:Keywords: Cosmogenic Radionuclides, Geomorphology
Geogr. Information Topic:Geoscientific Information
File Details
Data Type:Data Paper - Publication
File Size:12.4 MB
Date:Accepted: 28.02.2023
Mime Type:application/pdf
Data Format:PDF
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:[CRC1211DB] Data policy agreement
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Metadata Details
Metadata Creator:Benedikt Ritter
Metadata Created:13.03.2023
Metadata Last Updated:13.03.2023
Funding Phase:2
Metadata Language:English
Metadata Version:V50
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