摘要
伊犁黄土重矿物组成及石英颗粒表面结构特征分析表明 ,伊犁黄土不仅为风成沉积 ,而且黄土沉积环境较黄土高原更为干旱。黄土中复杂的重矿物组成和丰富的片状矿物的存在证明形成黄土的粉尘可能主要来自远离沉积区的中亚荒漠区。
The studies of heavy mineral composition and quartz surface texture of loess from Yili area show that the loess is a kind of aeolian deposit. It is characterized by the complex mineral composition and surface texture. Compared with the Loess Plateau, the unstable minerals are prevailing in the composition of the heavy mineral of loess and the siliceous deposits are not rich on the quartz surface. The assemblage of heavy minerals of loess from Yili area is hornblende, epidote and zoisite, opaque and biotite, whereas it is opaque, epidote and hornblende at the Loess Plateau. These suggest that the source of Yili loess is different from that of the Loess Plateau and the depositing environment of loess was drier. In addition to, the loess from Yili area is rich in schistose minerals and implies that the dust to form the loess may come from the Central Asia where the deserts are widespread.
出处
《干旱区研究》
CSCD
2000年第4期1-10,共10页
Arid Zone Research
基金
国家自然科学基金项目 !(批准号 :4 96 710 0 9)
国家重点基础研究发展规划项目 !(批准号 :G19990 4 350 2 )
关键词
伊犁地区
矿物特征
沉积环境
黄土
Yili Area,mineral characterist,depdsiting environmen
