[277] - Origin and timing of past hillslope activity in the hyper-arid core of the Atacama Desert – The formation of fine sediment lobes along the Chuculay Fault System, Northern Chile

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Citation
May, M., Meine, L., Hoffmeister, D., Brill, D., Medialdea, A., Wennrich, V., Gröbner, M., Schulte, P., Steininger, F., Deprez, M., de Kock, T., Bubenzer, O., 2020. Origin and timing of past hillslope activity in the hyper-arid core of the Atacama Desert – The formation of fine sediment lobes along the Chuculay Fault System, Northern Chile. Global and Planetary Change, 184 (103057), 1 - 18. DOI: 10.1016/j.gloplacha.2019.103057.
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Identification
Title(s):Main Title: Origin and timing of past hillslope activity in the hyper-arid core of the Atacama Desert – The formation of fine sediment lobes along the Chuculay Fault System, Northern Chile
Description(s):Abstract: Hillslopes represent areas of predominant denudation and constitute the transition and trajectory to floodplains; they play a crucial role in understanding the long-term landscape evolution of desert environments. However, although hillslope processes are known to be very slow or even stagnant in (hyper-) arid environments, process mechanisms under the virtual absence of water are poorly understood, and process rates are essentially unknown. Based on irrigation experiments, different monitoring techniques including drone-based high-resolution digital elevation models, geomorphological, stratigraphical, geochronological (OSL), sedimentological and geochemical investigations, as well as μCT scans of sediment cores, this contribution presents detailed insights into the chronostratigraphy of tongue-shaped, 50 m-long and 30 m-wide fine sediment lobes located along a 10–30° steep thrust-related slope east of the Salar Grande (Atacama, Chile). Irrigation experiments were performed to gain insights into precipitation thresholds for surface runoff and hillslope dynamics. Although artificial rainfall intensities were ~46 mm/h, infiltration was 100%, and the experiments did not initiate surface runoff or (detectable) slope material displacements. In addition, a distinct stratigraphic pattern with buried paleo-surfaces and paleo-biological surface crusts suggests increased hillslope activity during the late Pleistocene, potentially driven by changes of (fog-induced) humidity, salt-related shrink and swell processes, or paleo-seismic activity. While a variety of geo-bio-archives document periods of increased precipitation in the Andean parts of the Atacama Desert throughout the Quaternary, evidence for contemporaneous paleoclimatic changes from areas disconnected to Andean precipitation fluctuations (i.e., the Coastal Cordillera) is scarce. In this regard, the investigated landforms potentially represent one of only few sediment records recording paleoclimatic changes in the central desert, independent from Andean rainfall.
Identifier(s):DOI: 10.1016/j.gloplacha.2019.103057
Responsible Party
Creator(s):Author: Matthias May
Author: Lennart Meine
Author: Dirk Hoffmeister
Author: Dominik Brill
Author: Alicia Medialdea
Author: Volker Wennrich
Author: Marie Gröbner
Author: Philipp Schulte
Author: Florian Steininger
Author: Maxim Deprez
Author: Tim de Kock
Author: Olaf Bubenzer
Publisher:Elsevier
Topic
CRC1211 Topic:Surface
Related Sub-project(s):C3, Z2, Z3
Subject(s):CRC1211 Keywords: Geomorphology, Geochronology, Landscape Evolution, Luminescence Dating, Terrestrial Observation
Topic Category:Environment
File Details
File Name:1-s2.0-S0921818119305429-main.pdf
Data Type:Text
File Size:11104 kB (10.844 MB)
Date(s):Date Accepted: 2019-10-14
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
Constraints
Download Permission:OnlyCRC1211
General Access and Use Conditions:According to the CRC1211DB data policy agreement.
Access Limitations:According to the CRC1211DB data policy agreement.
Licence:Creative Commons Attribution 4.0 International (CC BY 4.0)
Geographic
North:-21.08849
East:-69.94176
South:-21.09049
West:-69.94355
Measurement Region:Central focus area
Measurement Location:--Central focus area--
Specific Informations - Publication
Status:PeerReviewed
Review:NoPeerReview
Year:2020
Type:Article
Article Type:Journal
Source:Global and Planetary Change
Issue:103057
Volume:184
Page Range:1 - 18
Metadata Details
Metadata Creator:Simon Matthias May
Metadata Created:2019-11-27
Metadata Last Updated:2020-05-15
Subproject:C3
Funding Phase:1
Metadata Language:English
Metadata Version:V43
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