| |  Online-Ressource |
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| Verfasst von: | Medialdea, Alicia [VerfasserIn]  |
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| | May, Simon Matthias [VerfasserIn] |
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| | Brill, Dominik [VerfasserIn] |
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| | King, Georgina [VerfasserIn] |
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| | Ritter, Benedikt [VerfasserIn] |
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| | Wennrich, Volker [VerfasserIn] |
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| | Bartz, Melanie [VerfasserIn] |
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| | Zander, Anja [VerfasserIn] |
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| | Kuiper, Klaudia [VerfasserIn] |
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| | Hurtado, Santiago [VerfasserIn] |
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| | Hoffmeister, Dirk [VerfasserIn] |
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| | Schulte, Philipp [VerfasserIn] |
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| | Gröbner, Marie [VerfasserIn] |
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| | Opitz, Stephan [VerfasserIn] |
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| | Brückner, Helmut [VerfasserIn] |
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| | Bubenzer, Olaf [VerfasserIn] |
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| Titel: | Identification of humid periods in the Atacama Desert through hillslope activity established by infrared stimulated luminescence (IRSL) dating |
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| Verf.angabe: | Alicia Medialdea, Simon Matthias May, Dominik Brill, Georgina King, Benedikt Ritter, Volker Wennrich, Melanie Bartz, Anja Zander, Klaudia Kuiper, Santiago Hurtado, Dirk Hoffmeister, Philipp Schulte, Marie Gröbner, Stephan Opitz, Helmut Brückner, Olaf Bubenzer |
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| Jahr: | 2020 |
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| Jahr des Originals: | 2019 |
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| Fussnoten: | Available online 29 November 2019 ; Gesehen am 02.04.2020 |
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| Titel Quelle: | Enthalten in: Global and planetary change |
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| Ort Quelle: | Amsterdam [u.a.] : Elsevier Science, 1989 |
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| Jahr Quelle: | 2020 |
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| Band/Heft Quelle: | 185(2020) Artikel-Nummer 103086, 16 Seiten |
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| ISSN Quelle: | 1872-6364 |
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| Abstract: | Geological records indicate that the hyper-aridity in the Atacama Desert has prevailed since at least the mid-Miocene, with shorter periods of increased humidity punctuating long-term aridity. The 7-m-high accumulation of colluvial sediments at the Salar Grande (21°S/70°W) studied here provides a key palaeoclimate record to understand hillslope dynamics and its relation to humid periods. While 10Be surface exposure ages point to long-term surface stability of the flat upslope surface, a combination of humidity-driven soil creep, overland flow and soil creep related to seismic shaking, caused denudation of the hillslope and accumulation of several metres of colluvium over much shorter timescales during the last 130 ka. A robust chronology for the hillslope sediments has been established by using Infrared Stimulated luminescence (pIR-IR225 protocol) on K-feldspar extracts from nine samples collected within the accumulation. A series of tests has been carried out to confirm the suitability of the method. The estimated ages indicate accelerated sedimentation at 35-80 ka, and 100-130 ka, which are interpreted as periods with more humid climate conditions than present. These findings agree with climate variations in the hyper-arid Atacama indicated by the activity of coastal alluvial fans and river catchments. |
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| DOI: | doi:10.1016/j.gloplacha.2019.103086 |
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| URL: | Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.
Volltext: https://doi.org/10.1016/j.gloplacha.2019.103086 |
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| | Volltext: http://www.sciencedirect.com/science/article/pii/S0921818119305715 |
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| | DOI: https://doi.org/10.1016/j.gloplacha.2019.103086 |
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| Datenträger: | Online-Ressource |
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| Sprache: | eng |
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| Sach-SW: | Atacama Desert |
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| | Hillslope deposits |
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| | Hillslope processes |
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| | Hyper-aridity |
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| | Infrared stimulated luminescence dating |
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| | IRSL |
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| | Palaeoclimate |
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| K10plus-PPN: | 169385676X |
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| Verknüpfungen: | → Zeitschrift |
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Identification of humid periods in the Atacama Desert through hillslope activity established by infrared stimulated luminescence (IRSL) dating / Medialdea, Alicia [VerfasserIn]; 2020 (Online-Ressource)
