西藏吉隆盆地沉积物中黏土矿物组合及其古气候意义  

Clay Mineralogy of Sediments in Gyirong Basin,Tibet and Paleoclimatic Significance

作　　者：薛惠娟[1] 侯一俊[1] 强泰[1] 张晓玲[1] 

机构地区：[1]中国地质大学(武汉)地球科学学院,湖北武汉430074

出　　处：《安徽农业科学》2008年第24期10439-10442,共4页Journal of Anhui Agricultural Sciences

基　　金：国土资源部地质调查局基础研究项目(1212010610103)

摘　　要：沉积物中黏土矿物具有一定的古环境指示意义。对吉隆盆地中上新世沉积物的研究表明,沉积物的矿物成分主要由黏土矿物伊利石、高岭石、绿泥石、蒙脱石以及长石、石英、方解石及少量的石膏等组成。沉积物的黏土矿物组合指示物源区气候演变经历了从暖湿到冷干的气候波动,显示了古气候由湿润逐渐变为干燥的演化规律。沉积物中伊利石结晶度的测量结果显示了古气候由湿润逐渐变为干燥的演化规律。Clay minerals in sediments had some ancient environmental significance. Studies on Gyirong Basin Pliocene sediments showed that the most composition of the sediments were smectite, kaolinite, chlorite, illite, sanidine, quartz, calcite and less gypsum. Gyirong Basin experienced from warm and solid to cold and arid.Ancient humid＇climate had gradually changed from the evolution of drying. Sediments illite crystallinity measurements showed that the ancient humid climate had gradually changed from the evolution of drying.

关 键 词：黏土矿物 结晶度 吉隆盆地 古气候 

分 类 号：S155.54[农业科学—土壤学]