柴达木盆地西部地区第三纪古湖泊研究

Study on Evolution of Paleo-Lake of Tertiary in West Chadam Basin

根据大量分析化验资料对柴达木盆地西部地区第三纪湖盆古水介质的演化进行了研究。第三纪湖盆微量元素特征表现为微咸水—咸水 ,并且在湖盆演化的不同时期其古水介质条件有明显的变化。碳酸盐岩、膏盐、盐岩组合以及生物标志化合物组合在垂向上的变化反映出第三纪经历了 2次盐湖旋回的演化 ,并且这种盐湖演化同第三纪湖盆沉积中心、沉降中心的迁移是一致的。在盐湖盆地沉积中粘土矿物呈现正常型和非正常型

Evolution of paleo water media of Tertiary period in Chadam Basin are studied on the base of laboratorial analysis .The lake of Tertiary period in Chadam shows a brackish to salt water according to the feather of microelement of metal ,and there are obvious differences among different periods.The distribution and combination of carbonate rock,gypsolith,salt rock and exhibit two circles of salt lake evolvement of Tertiary period.Concerning the movement of salt lake center on plane,it is consistent with the changes of depocenter and subsidence center of the basin.There are also two evolvement models of clay minerals,the normal one and the abnormal one because of the difference of paleo water media.