马里萨赫勒地区是全球荒漠化强烈发展的区域之一，广泛分布于地表的各类风成沙是沙质荒漠化发生发展的物质基础。本区风成沙的粒度组成以细沙为主，极细沙次之，各类型沙丘沙的粒度特征有一定差异；重矿物组分以稳定矿物和极稳定矿物占绝对优势，并具有高稳定度和成熟度。风成沙主要来源于古沙丘活化供沙、现代流水作用供沙、干涸湖泊和河流故道供沙等。上新世以来，本区经历了上新世至第四纪初期、末次冰期、全新世和现代等４个风成沙发育的主要时期 The Mali-Sahelian region is one of the regions where desertification in the world is strongly developing. Various wind-blown sand distributed on the surface is the material basis for the occurrence and development of sandy desertification. The grain size of aeolian sand in this area is mainly composed of fine sand, followed by fine sand, and the grain size characteristics of sand dunes of all types are quite different. The heavy minerals are dominated by stable minerals and extremely stable minerals with high stability Degree and maturity. Aeolian sand is mainly derived from the ancient sand dunes activated for sand, the role of modern water for sand, dry lakes and rivers for the sand and so on. Since the Pliocene, the region experienced four major stages of wind-blown sand development from the Pliocene to the early Quaternary, the Last Glaciation, the Holocene and the Modern