Late Pleistocene alluvial fan evolution along the coastal Atacama Desert (N Chile)

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Title:Main Title: Late Pleistocene alluvial fan evolution along the coastal Atacama Desert (N Chile)
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. Our study focuses on terrestrial and marine deposits of five CAF complexes between 20° and 25°S along the coastal zone of the Atacama to identify phases of alluvial fan activity during the Late Quaternary. Based on a combination of luminescence dating and 10Be cosmogenic nuclide exposure dating as well as existing chronological data in the area, insights into climatic variations along the hyperarid coast are presented for the Late Pleistocene derived from CAF morphodynamics. Activity of alluvial fans could be documented during time spans 95–80 ka, 60–45 ka, 35–20 ka, as well as the Holocene. Numerical dating of marine terrace deposits gives insights into the tectonic uplift of the Coastal Plain in northern Chile during the Late Quaternary period, for which estimated uplift rates between ~0.06 and ~0.57 m/ka were derived. While tectonic activity induces base-level changes, long-term tectonic activity rather indirectly controls alluvial fan activity. We suggest that alluvial fan activity is mainly controlled by atmospheric changes from the Pacific Ocean. Based on our observations, CAF in the hyper-arid Atacama Desert serve as suitable geo-archives for reconstructing climate changes during the Quaternary. In particular, the usefulness of alluvial fan systems in a water-limited environment is important for understanding the palaeoenvironmental evolution in a coastal desert.
Identifier:10.1016/j.gloplacha.2019.103091 (DOI)
Responsible Party
Creators:Melanie Bartz (Author), Janek Walk (Author), Steven Binnie (Author), Dominik Brill (Author), Georg Stauch (Author), Frank Lehmkuhl (Author), Dirk Hoffmeister (Author), Helmut Brückner (Author)
Funding Reference:Deutsche Forschungsgemeinschaft (DFG): CRC 1211: Earth - Evolution at the Dry Limit
Publisher:Elsevier B.V.
Publication Year:2020
Topic
CRC1211 Topic:Surface
Related Subproject:C2
Subjects:Keywords: Geomorphology, Landscape Evolution, Luminescence Dating, Cosmogenic Nuclides, Paleoclimate Proxies, Tectonics , Quaternary Geology, Geochronology, Dating , Arid Zone
Geographic Information Topic:Environment
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Filename:Bartz_et_al_2020_Late_Pleistocene_coastal_alluvial_fan_activity_Atacama_Desert_GPC_190.pdf
Data Type:Text - Article
Size:20 Pages
File Size:11.1 MB
Date:Accepted: 26.11.2019
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
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Download Permission:Only Project Members
Download Information:This file contains the article published in Global and Planetary Change, Volume 190.
General Access and Use Conditions:According to the CRC1211DB data policy agreement. © 2020 Elsevier B.V.
Access Limitations:According to the CRC1211DB data policy agreement. © 2020 Elsevier B.V.
Licence:[CRC1211DB] Data policy agreement
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Specific Information - Publication
Publication Status:Published
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Global and Planetary Change
Source Website:https://www.journals.elsevier.com/global-and-planetary-change
Issue:103091
Volume:190
Number of Pages:20 (1 - 20)
Metadata Details
Metadata Creator:Janek Walk
Metadata Created:19.06.2020
Metadata Last Updated:19.06.2020
Subproject:C2
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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