干旱区生态环境知识资源中心(Arid): Identification of humid periods in the Atacama Desert through hillslope activity established by infrared stimulated luminescence (IRSL) dating

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DOI	10.1016/j.gloplacha.2019.103086
	Identification of humid periods in the Atacama Desert through hillslope activity established by infrared stimulated luminescence (IRSL) dating
	Medialdea, Alicia 1; May, Simon Matthias 1; Brill, Dominik 1; King, Georgina 2; Ritter, Benedikt 3; Wennrich, Volker 3; Bartz, Melanie 1; Zander, Anja 1; Kuiper, Klaudia 4; Hurtado, Santiago 5; Hoffmeister, Dirk 1; Schulte, Philipp 6; Groebner, Marie 1; Opitz, Stephan 1; Brueckner, Helmut 1; Bubenzer, Olaf 7,8
通讯作者	Medialdea, Alicia
来源期刊	GLOBAL AND PLANETARY CHANGE
ISSN	0921-8181
EISSN	1872-6364
出版年	2020
卷号	185
英文摘要	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.
英文关键词	Palaeoclimate Atacama Desert Hyper-aridity Infrared stimulated luminescence dating IRSL Hillslope processes Hillslope deposits
类型	Article
语种	英语
国家	Germany ; Switzerland ; Netherlands ; Spain
收录类别	SCI-E
WOS记录号	WOS:000510315900008
WOS关键词	SALAR-DE-ATACAMA ; ELECTRON-SPIN-RESONANCE ; BLEACHED QUARTZ GRAINS ; NORTHERN CHILE ; HYPERARID-ATACAMA ; EXPOSURE AGES ; CENTRAL ANDES ; FAULT SYSTEM ; HYDROLOGIC VARIATION ; LANDSCAPE EVOLUTION
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314623
作者单位	1.Univ Cologne, Inst Geog, Otto Fischer Str 4, D-50674 Cologne, Germany; 2.Univ Lausanne, Inst Earth Surface Dynam, Lausanne, Switzerland; 3.Univ Cologne, Inst Geol & Mineral, Zulpicher Str 49a, D-50674 Cologne, Germany; 4.Vrije Univ Amsterdam, Dept Earth Sci, De Boelelaan 1085, NL-1081 HV Amsterdam, Netherlands; 5.Univ Seville, Ctr Invest, Serv Radioisotopos, Av Reina Mercedes 4B, E-41012 Seville, Spain; 6.Rhein Westfal TH Aachen, Dept Geog, Templergraben 55, D-52056 Aachen, Germany; 7.Heidelberg Univ, Inst Geog, Neuenheimer Feld 348, D-69120 Heidelberg, Germany; 8.Heidelberg Ctr Environm, Neuenheimer Feld 348, D-69120 Heidelberg, Germany
推荐引用方式 GB/T 7714	Medialdea, Alicia,May, Simon Matthias,Brill, Dominik,et al. Identification of humid periods in the Atacama Desert through hillslope activity established by infrared stimulated luminescence (IRSL) dating[J],2020,185.
APA	Medialdea, Alicia.,May, Simon Matthias.,Brill, Dominik.,King, Georgina.,Ritter, Benedikt.,...&Bubenzer, Olaf.(2020).Identification of humid periods in the Atacama Desert through hillslope activity established by infrared stimulated luminescence (IRSL) dating.GLOBAL AND PLANETARY CHANGE,185.
MLA	Medialdea, Alicia,et al."Identification of humid periods in the Atacama Desert through hillslope activity established by infrared stimulated luminescence (IRSL) dating".GLOBAL AND PLANETARY CHANGE 185(2020).