气候变化领域集成服务门户(CCPortal): Fluvial-Aeolian Interaction and Compositional Variability in the River-Fed Yarlung Tsangpo Dune System (Southern Tibet)

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DOI	10.1029/2022JF006920
	Fluvial-Aeolian Interaction and Compositional Variability in the River-Fed Yarlung Tsangpo Dune System (Southern Tibet)
	Liang, Wendong; Hu, Xiumian; Garzanti, Eduardo; Dong, Xiaolong; Zhang, Yiqiu
发表日期	2023
ISSN	2169-9003
EISSN	2169-9011
卷号	128 期号:5
英文摘要	River-fed dune fields characterized by relatively low quartz content are much more common on Earth than generally assumed, and the aeolian dune field system in the Yarlung Tsangpo (Upper Brahmaputra) river catchment is considered a typical example. As one of the highest-altitude fluvial-aeolian systems on Earth, the dune fields in different wide tracts of the Yarlung Tsangpo valley, made of sand entirely blown from the adjacent river bed, provides an excellent natural laboratory in which to investigate the diverse factors controlling textural and compositional changes induced by aeolian processes. To this aim, the textural (grain-size, roundness) and compositional (petrography, heavy minerals) properties of multiple size classes of fluvial and aeolian sands were quantified. The results show that sediment composition is markedly controlled by grain size, with greater intrasample than intersample variability. Grain-size controlled compositional differences cannot be exclusively ascribed to hydraulic-sorting effects. Independent of their density or shape, quartz, sedimentary rock fragments, zircon, apatite, and epidote grains are observed to be on average smaller than feldspars, volcanic rock fragments, and pyroxenes. This indicates that the original size of minerals in source rocks also played a significant role, limiting their availability in finer (e.g., garnet) or coarser (e.g., apatite) classes. In the river-fed dune system, the lower content of phyllosilicates and higher grain roundness could represent useful criteria to distinguish aeolian from fluvial sand. The efficient aeolian abrasion of river-fed sediments on the Tibetan Plateau may be an effective mechanism for the production of dust deposited as vast loess covers during the Quaternary.
关键词	sand petrography heavy minerals grain-size distribution grain roundness compositional variability fluvial-aeolian interaction
英文关键词	XIGAZE FORE-ARC; GRAIN-SIZE DEPENDENCE; ZIRCON U-PB; ZANGBO SUTURE; TECTONIC EVOLUTION; DETRITAL MINERALS; TETHYS HIMALAYA; MIDDLE REACHES; PASSIVE-MARGIN; LHASA TERRANE
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:001000236500001
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283453
作者单位	Chengdu University of Technology; Nanjing University; University of Milano-Bicocca
推荐引用方式 GB/T 7714	Liang, Wendong,Hu, Xiumian,Garzanti, Eduardo,et al. Fluvial-Aeolian Interaction and Compositional Variability in the River-Fed Yarlung Tsangpo Dune System (Southern Tibet)[J],2023,128(5).
APA	Liang, Wendong,Hu, Xiumian,Garzanti, Eduardo,Dong, Xiaolong,&Zhang, Yiqiu.(2023).Fluvial-Aeolian Interaction and Compositional Variability in the River-Fed Yarlung Tsangpo Dune System (Southern Tibet).JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE,128(5).
MLA	Liang, Wendong,et al."Fluvial-Aeolian Interaction and Compositional Variability in the River-Fed Yarlung Tsangpo Dune System (Southern Tibet)".JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE 128.5(2023).