R-mode Factor analysis method was used to reunite the whole analyzed 20 element contents into four factors,in which Factor I mainly composing of Al, Ti,Rb,Th,Mg,U,Zn,etc.

• 使用R型因子分析方法,将分析的20种常量与微量元素分为4个主要的因子:因子I主要由Al、Ti、Th、Rb、Mg、U和Zn等元素组成,代表了陆源物质有关的元素组合,可作为陆源物质输入的指示因子;