Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.geomorph.2014.05.007 |
Al-26/Be-10 dating of an aeolian dust mantle soil in western New South Wales, Australia | |
Fisher, Adrian1; Fink, David2; Chappell, John3; Melville, Michael1 | |
通讯作者 | Fisher, Adrian |
来源期刊 | GEOMORPHOLOGY
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ISSN | 0169-555X |
EISSN | 1872-695X |
出版年 | 2014 |
卷号 | 219页码:201-212 |
英文摘要 | Aeolian dust mantle soils are an important element of many landscapes in south-eastern Australia, though the age of these aeolian deposits has not been radiometrically determined. At Fowlers Gap in western New South Wales, surface cobbles of silcrete and quartz overlie a stone-free, aeolian dust mantle soil, which has a thickness of about 1.6 m. The clay-rich aeolian dust deposit in turn lies upon a buried silcrete and quartz stone layer. Modelling in-situ cosmogenic Al-26 and Be-10 concentrations measured in both the surface quartz stones and in the buried quartz layer of rocks, reveals that each has experienced a complex exposure-burial history. Due to the absence of quartz stones or sand at intermediate depths, our cosmogenic Al-26 and Be-10 modelling was not able to determine a definitive mechanism of stone pavement formation and stone burial. Various scenarios of stone formation, transport, burial and exhumation were tested that constrain the age of the deposit to range from 0.9 +/- 0.2 Ma to 1.8 +/- 0.2 Ma, based largely on different assumptions taken for the time-dependency of the net sedimentation rate. This corresponds with the initiation of the Simpson Desert dune fields and the deflation of lakes in central Australia, which probably responded to the shift to longer-wavelength, larger-amplitude Quaternary glacial cycles at around 1 Ma. Sensitivity analyses were carried out to identify those parameters which better constrained model outputs. Within model errors, which largely are the result of analytical errors in measured Al-26 and Be-10 concentrations, all three competing theories of colluvial wash, upward displacement of stones, and cumulic pedogenesis are possible mechanisms for the formation of the surface stone pavement. (C) 2014 Elsevier B.V. All rights reserved. |
英文关键词 | Cosmogenic nuclides Aluminium-26 Beryllium-10 Aeolian dust Stony deserts Quaternary palaeoclimate |
类型 | Article |
语种 | 英语 |
国家 | Australia |
收录类别 | SCI-E |
WOS记录号 | WOS:000339775100017 |
WOS关键词 | BE-10 PRODUCTION-RATE ; DESERT LOAM SOILS ; IN-SITU ; COSMOGENIC EXPOSURE ; LANDSCAPE EVOLUTION ; BARRIER RANGE ; DEPOSITS ; AL-26 ; ARIDITY ; RATES |
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/2XILL650/182292 |
作者单位 | 1.Univ New S Wales, Sch Biol Earth & Environm Sci, Sydney, NSW 2052, Australia; 2.Australian Nucl Sci & Technol Org, Inst Environm Res, Menai, NSW 2234, Australia; 3.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia |
推荐引用方式 GB/T 7714 | Fisher, Adrian,Fink, David,Chappell, John,et al. Al-26/Be-10 dating of an aeolian dust mantle soil in western New South Wales, Australia[J],2014,219:201-212. |
APA | Fisher, Adrian,Fink, David,Chappell, John,&Melville, Michael.(2014).Al-26/Be-10 dating of an aeolian dust mantle soil in western New South Wales, Australia.GEOMORPHOLOGY,219,201-212. |
MLA | Fisher, Adrian,et al."Al-26/Be-10 dating of an aeolian dust mantle soil in western New South Wales, Australia".GEOMORPHOLOGY 219(2014):201-212. |
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