Late Pleistocene to Holocene morphodynamics of a multi-phased alluvial fan complex at the coast of the hyperarid Atacama Desert, northern Chile

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Title:Main Title: Late Pleistocene to Holocene morphodynamics of a multi-phased alluvial fan complex at the coast of the hyperarid Atacama Desert, northern Chile
Description:Abstract: Along the coast of the Atacama Desert between 20.5 and 25.5°S, Quaternary alluvial fans emerge from the Coastal Cordillera towards the Pacific Ocean. Coastal alluvial fans (CAF) become the most prominent sedimentary feature towards the south. Compared to the interior alluvial fans of the hyperarid Atacama Desert, the CAF are much younger and highly active. However, neither their activity nor the dependency of their morphodynamics on climatic and geologic controls are as yet well understood. Hypothesizing a late Quaternary sedimentary evolution which is decoupled from the hinterlands, we carried out detailed geomorphological studies at a CAF complex at Guanillos (70°10.5’ W, 21°58’ S). The fan complex is in an advanced evolutionary state due to its prograde evolution, strong dissection, and abandoned surface generations. We conducted remote sensing on different scales to characterize the sediment transport in the catchment as well as the secondary processes modifying the primary alluvial fan deposits over time. Derivatives of Sentinel-2, high resolution Pleiades-1, and very high resolution UAV imagery were used for this purpose. Furthermore, a primarily 10Be exposure age-based morphochronology of the CAF complex was established. Parametrization of the micro- to mesoscale surface morphology, in combination with spectral analyses, enable a morphostratigraphic distinction of up to six fan generations. With regards to the 10Be exposure ages, prograde evolution took place between ~30 ka and ~10 ka. In addition, 14C samples from a higher terrace yield ages younger than AD 1520, indicating strong CAF activity until recent times. Interpretation of the local results along the N-S gradient reveals that the recent CAF morphodynamics are governed by climatic conditions; in particular, the northward decreasing frequency of extreme precipitation events. Correlating the established morphochronology with regional palaeoclimatic proxies further implies that this climatic dependency prevailed at least throughout the late Pleistocene and Holocene.
Responsible Party
Creators:Janek Walk (Author), Melanie Bartz (Author), Georg Stauch (Author), Steven Binnie (Author), Ariane Binnie (Author), Tibor Dunai (Author), Helmut Brückner (Author), Frank Lehmkuhl (Author)
Funding Reference:Deutsche Forschungsgemeinschaft (DFG): CRC 1211: Earth - Evolution at the Dry Limit
Publisher:CRC1211 Database (CRC1211DB)
Publication Year:2019
Topic
CRC1211 Topic:Surface
Related Subproject:C2
Subjects:Keywords: Geomorphology, Remote Sensing, Cosmogenic Nuclides, Geochronology, GIS, Landscape Evolution
Geogr. Information Topic:Environment
File Details
Filename:PPP_DKG_AKG_19_Atacama_CAF_morphodynamics_GUA.pdf
Data Type:Text - Text
File Size:5.3 MB
Date:Created: 26.09.2019
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
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Download Permission:Only Project Members
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
Geographic
Specific Information - Presentation
Presenter:Janek Walk
Presentation Date:28th of September, 2019
Presentation Type:Talk
Event:German Congress for Geography 2019
Event Type:Conference
Event Location:Kiel, Germany
Event Duration:25th of September, 2019 - 30th of September, 2019
Event Website:https://www.dkg2019.de/english/
Metadata Details
Metadata Creator:Janek Walk
Metadata Created:22.10.2019
Metadata Last Updated:22.10.2019
Subproject:C2
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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