关键词: 元素, 粘土矿物, 沉积环境

Abstract: The author has researched the migration and distibutional laws of the elements(Fe,Mn,Cr,V,Co,Ni) of humid climatic type arid the elements(Ca,Mg,K,Na,Sr,Ba) of dry climatic type,and the introduced the concept of palaeoclimatic index:Palaeoclimatic index C=Σ(Fe+Mn+Cr+V+Co+Ni)/Σ(Ca+Mg+Sr+Ba+K+Na) Based on the Quantitative analysis of paleaoclimatic changes,the author inferred the climatic conditions and the desertification processes in the Horqin Sand Land since late pleistocene.It has been found from the element distribution in sandy mass that the elements of first transitional element series varied regularly in the desertification processes,which is helpful to predict the desertification development.The clay mineral assemblage in the Horqin Sand Land is dominated by montmorillonite,and the accompanied clay minerals are illite and chlorite.They are all clay minerals of dry type.