干旱区生态环境知识资源中心(Arid): Weathering under coastal hyperaridity - Late Quaternary development of spectral, textural, and gravelometric alluvial fan surface characteristics

Arid

DOI	10.1016/j.quascirev.2021.107339
	Weathering under coastal hyperaridity - Late Quaternary development of spectral, textural, and gravelometric alluvial fan surface characteristics
	Walk, Janek; Bartz, Melanie; Stauch, Georg; Binnie, Ariane; Bruckner, Helmut; Lehmkuhl, Frank
通讯作者	Walk, J (corresponding author), Rhein Westfal TH Aachen, Chair Phys Geog & Geoecol, Dept Geog, Wullnerstr 5b, D-52056 Aachen, Germany.
来源期刊	QUATERNARY SCIENCE REVIEWS
ISSN	0277-3791
EISSN	1873-457X
出版年	2022
卷号	277
英文摘要	Hyperarid coasts develop under relatively high air humidity and abundant sea salt aerosols, resulting in physical and chemical weathering processes that distinctly differ from those present in inland deserts. However, neither the geomorphic effects of the weathering processes nor the timescales on which they alter depositional surfaces are sufficiently understood. In this study we therefore integrate spectral, textural, and gravelometric analyses based on high to very high resolution satellite and aerial remote sensing to assess the degree of post-depositional alteration of a multi-stage alluvial fan at the coast of the Atacama Desert. To further deduce the present-day as well as past intensities of responsible weathering processes we establish a morphochronology of the fan's evolution using cosmogenic 10 Be exposure dating. Spectral, textural, and gravelometric parameters relatively date a succession of fan generations, assuming the weathering of fan surface sediments prior to deposition can be largely excluded. Under coastal hyperaridity, effects on the spectral surface signatures are primarily explained by the development of weathering rinds and related formation of secondary iron oxides. Spectral iron oxide ratios show little to no change during the Holocene but strongly increase during the Late Glacial, while over longer timescales an asymptotic increase is suggested. Clast breakdown can largely be attributed to salt weathering causing sublinear to roughly linear decreases in mean size, coarseness, and size variation of coarse clasts. Governed by clast breakdown as well as lateral remobilization of clasts, nano-scale surface roughness exhibits a non-monotonic, peak-shaped relationship with age, whereas the micro-relief experiences continuous smoothing due to denudation. Findings are summarized in a conceptual model showing that in hyperarid coastal environments fan surface weathering results over timescales of 10(4) to 10(5) a in a fully developed desert pavement. Two hypothetical scenarios are introduced which differ based on whether desert pavements remain stable over timescales exceeding the Late Pleistocene or not. Late Quaternary weathering intensity along the coast of the Atacama Desert is found to be related to sea surface temperature variability and sea level jointly driving the oceanic moisture supply. (C) 2021 The Authors. Published by Elsevier Ltd.
英文关键词	Quaternary palaeoclimatology South America Atacama Desert weathering multispectral imagery surface roughness grain size unmanned aerial system cosmogenic isotopes
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:000731929900002
WOS关键词	ACCELERATOR MASS-SPECTROMETRY ; NUCLIDE PRODUCTION-RATES ; NORTH CHILEAN ANDES ; ATACAMA DESERT ; COSMOGENIC BE-10 ; MAGMATIC ARC ; SEA-LEVEL ; TARAPACA REGION ; EROSION RATES ; SIZE ANALYSIS
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/2XILL650/374501
作者单位	[Walk, Janek; Stauch, Georg; Lehmkuhl, Frank] Rhein Westfal TH Aachen, Dept Geog, D-52056 Aachen, Germany; [Bartz, Melanie] Univ Lausanne, Inst Earth Surface Dynam, CH-1015 Lausanne, Switzerland; [Bartz, Melanie; Bruckner, Helmut] Univ Cologne, Inst Geog, D-50674 Cologne, Germany; [Binnie, Ariane] Rhein Westfal TH Aachen, Inst Neotecton & Nat Hazards, D-52056 Aachen, Germany; [Binnie, Ariane] Univ Cologne, Inst Geol & Mineral, D-50674 Cologne, Germany
推荐引用方式 GB/T 7714	Walk, Janek,Bartz, Melanie,Stauch, Georg,et al. Weathering under coastal hyperaridity - Late Quaternary development of spectral, textural, and gravelometric alluvial fan surface characteristics[J],2022,277.
APA	Walk, Janek,Bartz, Melanie,Stauch, Georg,Binnie, Ariane,Bruckner, Helmut,&Lehmkuhl, Frank.(2022).Weathering under coastal hyperaridity - Late Quaternary development of spectral, textural, and gravelometric alluvial fan surface characteristics.QUATERNARY SCIENCE REVIEWS,277.
MLA	Walk, Janek,et al."Weathering under coastal hyperaridity - Late Quaternary development of spectral, textural, and gravelometric alluvial fan surface characteristics".QUATERNARY SCIENCE REVIEWS 277(2022).