【摘要】 利用X射线衍射方法对成都金沙遗址IT6814探坑约4 m厚(约4 kaBP以来沉积)地层剖面的黏土矿物进行了分析,发现黏土矿物主要由伊利石、绿泥石、伊利石-蒙脱石混层矿物和少量高岭石组成。根据黏土矿物含量变化的分析和对比研究,划分出成都平原黏土矿物变化的5个阶段,得出成都平原的气候变化经历了由温凉偏干与温暖潮湿的交替,在2 500 aBP发生了较为明显的快速降温过程。通过对比探讨了古人类活动对黏土矿物的影响尺度,认为古人类活动的影响较低,黏土矿物的成分和含量可以作为气候变化的指示剂。更多还原

【Abstract】 By the analyses of the X-ray diffraction,contents of clay minerals of the sediments from Jinsha site IT6814 of Chengdu are measured.The results show that the main types of the clay minerals are illite,chlorite,illite-montmorillonite and kaolinite.Analyses and study on these clay mineral types and contents show that Chengdu plain can be divided into five phases.Climate in Chengdu plain went from temperate-cool and a little dry to warm and moist.The temperature decreased abruptly since 2 500 aBP.And the influence of the ancient activity on the clay mineral is low.So the ingredient and content of clay mineral may be taken as the climatic indicator.更多还原