[378] - Late Pleistocene alluvial fan evolution along the coastal Atacama Desert (N Chile)

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Citation
Bartz, M., Walk, J., Binnie, S., Brill, D., Stauch, G., Lehmkuhl, F., Hoffmeister, D., Brückner, H., 2020. Late Pleistocene alluvial fan evolution along the coastal Atacama Desert (N Chile). Global and Planetary Change, 190 (103091), 1 - 20. DOI: 10.1016/j.gloplacha.2019.103091.
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Identification
Title(s):Main Title: Late Pleistocene alluvial fan evolution along the coastal Atacama Desert (N Chile)
Description(s):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(s):DOI: 10.1016/j.gloplacha.2019.103091
Responsible Party
Creator(s):Author: Melanie Bartz
Author: Janek Walk
Author: Steven Binnie
Author: Dominik Brill
Author: Georg Stauch
Author: Frank Lehmkuhl
Author: Dirk Hoffmeister
Author: Helmut Brückner
Funding Reference(s):Deutsche Forschungsgemeinschaft (DFG): CRC 1211: Earth - Evolution at the Dry Limit
Publisher:Elsevier B.V.
Topic
CRC1211 Topic:Surface
Related Sub-project(s):C2
Subject(s):CRC1211 Keywords: Geomorphology, Landscape Evolution, Luminescence Dating, Cosmogenic Nuclides, Paleoclimate Proxies, Tectonics, Quaternary Geology, Geochronology, Dating, Arid Zone
Topic Category:Environment
File Details
File Name:Bartz_et_al_2020_Late_Pleistocene_coastal_alluvial_fan_activity_Atacama_Desert_GPC_190.pdf
Data Type:Text
Size(s):20 Pages
File Size:11415 kB (11.147 MB)
Date(s):Date Accepted: 2019-11-26
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
Constraints
Download Permission:OnlyCRC1211
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
Geographic
North:-20.46348
East:-69.80276
South:-25.41889
West:-70.59378
Measurement Region:Chile
Measurement Location:--Chile--
Specific Informations - Publication
Status:Published
Review:PeerReview
Year:2020
Type:Article
Article Type:Journal
Source:Global and Planetary Change
Issue:103091
Volume:190
Number Of Pages:20
Page Range:1 - 20
Metadata Details
Metadata Creator:Janek Walk
Metadata Created:2020-06-19
Metadata Last Updated:2020-06-19
Subproject:C2
Funding Phase:1
Metadata Language:English
Metadata Version:V43
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