干旱区生态环境知识资源中心(Arid): Origin and timing of past hillslope activity in the hyper-arid core of the Atacama Desert The formation of fine sediment lobes along the Chuculay Fault System, Northern Chile

Arid

DOI	10.1016/j.gloplacha.2019.103057
	Origin and timing of past hillslope activity in the hyper-arid core of the Atacama Desert The formation of fine sediment lobes along the Chuculay Fault System, Northern Chile
	May, Simon Matthias 1; Meine, Lennart 1; Hoffmeister, Dirk 1; Brill, Dominik 1; Medialdea, Alicia 1; Wennrich, Volker 2; Groebner, Marie 1; Schulte, Philipp 3; Steininger, Florian 1; Deprez, Maxim 4; de Kock, Tim 4; Bubenzer, Olaf 5,6
通讯作者	May, Simon Matthias
来源期刊	GLOBAL AND PLANETARY CHANGE
ISSN	0921-8181
EISSN	1872-6364
出版年	2020
卷号	184
英文摘要	Hillslopes represent areas of predominant denudation and constitute the transition and trajectory to floodplains; they play a crucial role in understanding the longterm landscape evolution of desert environments. However, although hillslope processes are known to be very slow or even stagnant in (hyper-) arid environments, process mechanisms under the virtual absence of water are poorly understood, and process rates are essentially unknown. Based on irrigation experiments, different monitoring techniques including drone-based high-resolution digital elevation models, geomorphological, stratigraphical, geochronological (OSL), sedimentological and geochemical investigations, as well as mu CT scans of sediment cores, this contribution presents detailed insights into the chronostratigraphy of tongue-shaped, 50 m-long and 30 m-wide fine sediment lobes located along a 10-30 degrees steep thrust-related slope east of the Salar Grande (Atacama, Chile). Irrigation experiments were performed to gain insights into precipitation thresholds for surface runoff and hillslope dynamics. Although artificial rainfall intensities were similar to 46 mm/h, infiltration was 100%, and the experiments did not initiate surface runoff or (detectable) slope material displacements. In addition, a distinct stratigraphic pattern with buried paleo-surfaces and paleo-biological surface crusts suggests increased hillslope activity during the late Pleistocene, potentially driven by changes of (fog-induced) humidity, salt-related shrink and swell processes, or paleo-seismic activity. While a variety of geo-bio-archives document periods of increased precipitation in the Andean parts of the Atacama Desert throughout the Quaternary, evidence for contemporaneous paleoclimatic changes from areas disconnected to Andean precipitation fluctuations (i.e., the Coastal Cordillera) is scarce. In this regard, the investigated landforms potentially represent one of only few sediment records recording paleoclimatic changes in the central desert, independent from Andean rainfall.
类型	Article
语种	英语
国家	Germany ; Belgium
收录类别	SCI-E
WOS记录号	WOS:000508491500026
WOS关键词	PORTABLE RAINFALL SIMULATOR ; TARAPACA REGION ; CLIMATE-CHANGE ; LANDSCAPE EVOLUTION ; ZEBRA STRIPES ; RECORD ; MIOCENE ; FOG ; IGNIMBRITES ; SEISMICITY
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
EI主题词	2020-01-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/312265
作者单位	1.Univ Cologne, Inst Geog, D-50923 Cologne, Germany; 2.Univ Cologne, Inst Geol & Mineral, D-50674 Cologne, Germany; 3.Rhein Westfal TH Aachen, Dept Geog, D-52056 Aachen, Germany; 4.Univ Ghent, Dept Geol, PProGRess, UGCT, B-9000 Ghent, Belgium; 5.Heidelberg Univ, Inst Geog, D-69120 Heidelberg, Germany; 6.Heidelberg Ctr Environm, D-69120 Heidelberg, Germany
推荐引用方式 GB/T 7714	May, Simon Matthias,Meine, Lennart,Hoffmeister, Dirk,et al. Origin and timing of past hillslope activity in the hyper-arid core of the Atacama Desert The formation of fine sediment lobes along the Chuculay Fault System, Northern Chile[J],2020,184.
APA	May, Simon Matthias.,Meine, Lennart.,Hoffmeister, Dirk.,Brill, Dominik.,Medialdea, Alicia.,...&Bubenzer, Olaf.(2020).Origin and timing of past hillslope activity in the hyper-arid core of the Atacama Desert The formation of fine sediment lobes along the Chuculay Fault System, Northern Chile.GLOBAL AND PLANETARY CHANGE,184.
MLA	May, Simon Matthias,et al."Origin and timing of past hillslope activity in the hyper-arid core of the Atacama Desert The formation of fine sediment lobes along the Chuculay Fault System, Northern Chile".GLOBAL AND PLANETARY CHANGE 184(2020).