中文摘要：

应用X射线衍射（XRD）分析技术，对处于西风区的新疆伊犁昭苏黄土剖面中的138个全岩样品和9组分粒级样品进行了分析，获得了该剖面的矿物组分、含量及其粒径分布信息。昭苏黄土主要由石英、方解石、绿泥石、斜长石、普通角闪石、钾长石、白云石和白云母组成；方解石在各个粒级组分中分布相对均匀；石英、白云石、斜长石、普通角闪石和钾长石主要赋存于粗颗粒中；绿泥石在细颗粒中的含量明显较高；白云母在16~32 SymbolmA@ m粒级组分中含量较低，在其它粒级组分中的含量则相对更高。各矿物学指标揭示了昭苏黄土剖面的化学风化程度整体较低且变化幅度不大，但古土壤层的化学风化程度稍强于黄土层；物理风化则经历了由强到弱的两个波动过程。

英文摘要：

The loess record in the Ili basin dominated by westerly provides an important archive of regional climate and environmental change. However, in contrast to the widely investigated loess deposits in Chinese Loess Plateau, Ili loess-paleosol sequences are still insufficiently known and poorly understood. During the past decade, the lithology, genesis, sources, geochemical composition and distribution of the Ili loess as well as the paleoclimatic significance of various proxies such as magnetic susceptibility have been investigated. However, there are few reports about mineralogy and weathering history of Ili loess. Based on X ray diffraction analysis, the authors carried out the mineral composition and particle size distribution of both 138 bulk samples and 45 different grain size fractions from Zhaosu loess-paleosol section in the Ili basin, Xinjiang. Levenberg-Marquardt （LM） method was applied to compute the content of 8 kinds of minerals with mixed standard material quantitative Corundum. The results showed that the calculated values of corundum were in good agreement with given ratio values, the loess was mainly consisted of quartz, calcite, chlorite, plagioclase, hornblende, K feldspar, dolomite and muscovite. The distribution of calcite was uniform within each grain size fractions, the coarse sediment were dominated by quartz, plagioclase, dolomite, hornblende and K feldspar, the chlorite in 〈16μm size fraction achieve a considerably higher content than other minerals, the muscovite in 16~32 SymbolmA@ m size fraction had low content and in other size fractions had higher content. The minerals content and their ratios can show the variety of environment and the intensity of weathering in Ili loess. Those mineralogy indicators showed that the Zhaosu loess-paleosol sequence had weak chemical weathering, but the intensity of chemical weathering of paleosol were stronger than loess layers. The intensity of physical weathering in Zhaosu section during the past 80000 years can be reconstructed as strong ph