干旱区生态环境知识资源中心(Arid): Testing models of linear dune formation by provenance analysis with composite sediment fingerprints

Arid

DOI	10.1016/j.geomorph.2020.107208
	Testing models of linear dune formation by provenance analysis with composite sediment fingerprints
	Telfer, M. W.; Gholami, H.; Hesse, P. P.; Fisher, A.; Hartley, R.
通讯作者	Telfer, MW
来源期刊	GEOMORPHOLOGY
ISSN	0169-555X
EISSN	1872-695X
出版年	2020
卷号	364
英文摘要	The formative mechanisms of linear (longitudinal) dunes and dunefields remain uncertain, and multiple hypotheses have been proposed. A central debate is the degree to which dunes act as along-dune sediment transport corridors, implying that dunes grow primarily by extension, or whether they are comprised of locally-derived sands moved from adjacent interdunes (the 'wind-riff model). Sediment fingerprinting studies, with origins in fluvial science, have been shown to offer the possibility to trace the provenance of aeolian sands, and thus elucidate transport pathways. Two models (a Monte Carlo framework and a Generalized Likelihood Uncertainty Estimate framework) are used here to provide quantitative estimates of the sediment sources that have supplied a linear dune in the central Simpson Desert of central Australia. Four possible sources are identified that may have supplied the dune; two adjacent interdunes, one upwind low ridge of sand, and a merging upwind dune. Two sites near the dune's crest are used as the target and provided twenty surface samples for analysis. Following geochemical assay, step-wise discriminant function analysis identified optimum elemental sediment fingerprints for a variety of possible sediment pathway configurations. Results suggest that the sands of the dune are sourced predominantly from upwind dunes and sand sources, and that likely contributions from neighbouring dune swales are typically <20%. As such, wind-rift mechanisms of linear dune formation are not supported by these data. More complex sediment pathway configurations (i.e., other than a binary approach: interdune vs. along-dune), whilst confirming the initial findings, had reduced discriminatory power. Further separation of source pathways (e.g., identifying the relative roles of different upwind sources) was not possible with any confidence. The findings suggest recent sediment accretion of a linear dune dominated by along-dune sand flux, and thus support an extensional component for the development of such dunes. Whilst it is noted that at a point-bypoint basis this might not exclude accretion by vertical growth, as some have observed, there is no clear support for a substantive contribution to the dune sands from adjacent interdunes. Moreover, the use of contemporary sediment fingerprinting methods to question hypotheses of aeolian geomorphology suggests that such methods have great potential for addressing other terrestrial geomorphological questions where identifying sediment pathways can provide vital insight. (C) 2020 Elsevier B.V. All rights reserved.
英文关键词	Linear dunes Dune extension Sediment provenance Monte Carlo simulation
类型	Article
语种	英语
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000540373900004
WOS关键词	STIMULATED LUMINESCENCE AGES ; SIMPSON-DESERT ; LONGITUDINAL DUNES ; LATERAL MIGRATION ; INTERNAL STRUCTURES ; QAIDAM BASIN ; SAND DUNES ; TIRARI DESERTS ; WIND-RIFT ; CATCHMENT
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/2XILL650/324758
作者单位	[Telfer, M. W.; Fisher, A.; Hartley, R.] Univ Plymouth, SOGEES, Plymouth PL4 8AA, Devon, England; [Gholami, H.] Univ Hormozgan, Dept Nat Resources Engn, Bandar Abbas, Hormozgan, Iran; [Hesse, P. P.] Macquarie Univ, Dept Earth & Environm Sci, N Ryde, NSW, Australia
推荐引用方式 GB/T 7714	Telfer, M. W.,Gholami, H.,Hesse, P. P.,et al. Testing models of linear dune formation by provenance analysis with composite sediment fingerprints[J],2020,364.
APA	Telfer, M. W.,Gholami, H.,Hesse, P. P.,Fisher, A.,&Hartley, R..(2020).Testing models of linear dune formation by provenance analysis with composite sediment fingerprints.GEOMORPHOLOGY,364.
MLA	Telfer, M. W.,et al."Testing models of linear dune formation by provenance analysis with composite sediment fingerprints".GEOMORPHOLOGY 364(2020).