Universität zu Köln

Medialdea, Alicia ORCID: 0000-0001-5895-0736, May, Simon Matthias, Brill, Dominik ORCID: 0000-0001-8637-4641, King, Georgina, Ritter, Benedikt ORCID: 0000-0002-5652-1169, Wennrich, Volker ORCID: 0000-0003-3617-1963, Bartz, Melanie ORCID: 0000-0002-4703-6057, Zander, Anja ORCID: 0000-0003-0449-1401, Kuiper, Klaudia, Hurtado, Santiago, Hoffmeister, Dirk ORCID: 0000-0002-8178-557X, Schulte, Philipp, Groebner, Marie, Opitz, Stephan, Brueckner, Helmut and Bubenzer, Olaf (2020). Identification of humid periods in the Atacama Desert through hillslope activity established by infrared stimulated luminescence (IRSL) dating. Glob. Planet. Change, 185. AMSTERDAM: ELSEVIER. ISSN 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 degrees S/70 degrees W) studied here provides a key palaeoclimate record to understand hillslope dynamics and its relation to humid periods. While 1 degrees Be 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Medialdea, Alicia UNSPECIFIED orcid.org/0000-0001-5895-0736 UNSPECIFIED May, Simon Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED Brill, Dominik UNSPECIFIED orcid.org/0000-0001-8637-4641 UNSPECIFIED King, Georgina UNSPECIFIED UNSPECIFIED UNSPECIFIED Ritter, Benedikt UNSPECIFIED orcid.org/0000-0002-5652-1169 UNSPECIFIED Wennrich, Volker UNSPECIFIED orcid.org/0000-0003-3617-1963 UNSPECIFIED Bartz, Melanie UNSPECIFIED orcid.org/0000-0002-4703-6057 UNSPECIFIED Zander, Anja UNSPECIFIED orcid.org/0000-0003-0449-1401 UNSPECIFIED Kuiper, Klaudia UNSPECIFIED UNSPECIFIED UNSPECIFIED Hurtado, Santiago UNSPECIFIED UNSPECIFIED UNSPECIFIED Hoffmeister, Dirk UNSPECIFIED orcid.org/0000-0002-8178-557X UNSPECIFIED Schulte, Philipp UNSPECIFIED UNSPECIFIED UNSPECIFIED Groebner, Marie UNSPECIFIED UNSPECIFIED UNSPECIFIED Opitz, Stephan UNSPECIFIED UNSPECIFIED UNSPECIFIED Brueckner, Helmut UNSPECIFIED UNSPECIFIED UNSPECIFIED Bubenzer, Olaf UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-351656
DOI:	10.1016/j.gloplacha.2019.103086
Journal or Publication Title:	Glob. Planet. Change
Volume:	185
Date:	2020
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	1872-6364
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SALAR-DE-ATACAMA; ELECTRON-SPIN-RESONANCE; BLEACHED QUARTZ GRAINS; NORTHERN CHILE; HYPERARID-ATACAMA; EXPOSURE AGES; CENTRAL ANDES; FAULT SYSTEM; HYDROLOGIC VARIATION; LANDSCAPE EVOLUTION Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/35165