中文摘要：

成都盆地位于长江上游二级阶梯向一级阶梯的过渡地带,地理位置特殊,并且广布第四纪红土沉积。为研究成都盆地中黏土矿物的特征及其成因意义,采用X射线衍射（XRD）测试技术,对胜利剖面沉积物中黏土矿物的矿物学特征进行了系统研究。结果表明,成都盆地胜利剖面沉积物中的黏土矿物主要有伊利石、高岭石、蛭石、蒙脱石以及少量伊利石-蒙脱石混层黏土矿物和高岭石-蒙脱石混层黏土矿物。根据黏土矿物组合含量的变化特征,可以将成都盆地第四纪早更新世中晚期以来的气候环境演化划分为4个阶段,先后经历了湿热-温凉-温湿-干冷2个周期性的气候旋回,黏土矿物含量变化的总趋势与土壤沉积物的CIA指数共同揭示了研究区第四纪以来的气候有逐渐干冷的趋势,这与全球性的第四纪气候尤其是中国区域内的第四纪气候环境变化相一致。

英文摘要：

The Chengdu Basin lies upstream oi the i a~ tween the second step and the first step of China geomorphy. The Quarternary red earth sediments are widely abundant in the basin. To obtain better understanding of palaeoclimate evolution in the area, clay mineralogy of the Shengli laterite profile in Chengdu Basin was investigated using X-ray diffraction （XRD） methods. The XRD analysis results showed that clay minerals in the red earth sediments were mainly il- fire, kaolinite, vermiculite, and montmorillonite, with small amounts of illite-smectite and kaolinite-mont- morillonite mixed-layer clay minerals. Based on relative contents of clay minerals along the profile, palaeo- climate evolution in Chengdu Basin was divided into four stages since the middle Early Pleistocene, which experienced two warm/humid to cold/arid cycles. The CIA curve as well as change of the general trend of clay minerals reflects that the climate gradually became cold since the Quarternary time. This is consistent with the global climate change in Quarternary, especially the climate change in China.