Journal
AEOLIAN RESEARCH
Volume 32, Issue -, Pages 60-70Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.aeolia.2018.01.005
Keywords
Tibetan Plateau; Qaidam Basin; Dune sand; Provenance; Geochemistry
Categories
Funding
- (973) National Basic Research Program of China [2013CB956001]
- National Natural Science Foundation of China [41071129]
- Fund for Creative Research Groups of National Natural Science Foundation of China [41321001]
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The main purpose of this study is to analyse the material source of different grain-size components of dune sand in the Qaidam Basin. We determined the trace and rare earth element (REE) compositions and Sr-Nd isotopic compositions of the coarse (75-500 mu m) and fine (< 75 mu m) fractions of surface sediment samples. The comparison of the immobile trace element and REE compositions, Sr-Nd isotopic compositions and multidimensional scaling (MDS) results of the dune sands with those of different types of sediments in potential source areas revealed the following information. (1) The fine- and coarse-grained fractions of dune sands in the Qaidam Basin exhibit distinctly different elemental concentrations, elemental patterns and characteristic parameters of REE. Moreover, Sr-Nd isotopic differences also exist between different grain-size fractions of aeolian sand, which means that different grain-size fractions of these dune sands have different source areas. (2) The geochemical characteristics of the coarse particles of dime sand exhibit obvious regional heterogeneity and generally record a local origin derived from local fluvial sediments and alluvial/proluvial sediments. The coarse- and fine-grained dune sand in the southern Qaidam Basin mainly came from Kunlun Mountains, whereas the coarse- and fine-grained dune sand in the northeastern Qaidam Basin mainly came from Qilian Mountains. (3) The fine-grained fractions of sediments throughout the entire Qaidam Basin may have been affected by the input of foreign materials from the Tarim Basin.
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