关键词: 准噶尔盆地, 沙漠沙, 矿物组成, 多源性

Abstract: The paper discusses the analyzing results of mineral compositions of 87 sand samples from 9 des- erts in the Jungger Basin. By comparing the assemblage feature of heavy minerals, the standard deviation of mineral composition and the ratio between quartz and feldspar of light minerals for dune-sands with that of underlying-sands, it is revealed that because of different geographic locations of these deserts, their mineral compositions are remarkable distinct. The multiplicity of mineral composition results from the multi-sources of sand materials. The similarity of mineral composition for different types of sand materials in the same desert is larger than the differential of that, sand accumulated by wind on the spot is the main cause of forming sand dune in the process of underlying-sand evolving into dune-sand. However, there is remakable action by wind mixing so that the later (dune sand) has much wider material sources. It should be directed out that stable heavy mineral assemblage is a better indicator to understand composition feature of material source, and unstable heavy mineral assemblage is a comprehensive parameter of knowing source and environmental characteristics.

Key words: Jungger Basin, desert sand, mineral composition, multi-sources