花岗岩及其形成的大地构造环境

花岗岩与大地构造环境之间存在着成因联系，因为岩浆活动受到了构造环境的控制。在大地构造演化的各个阶段中，花岗岩的岩石化学成分表现出有序的演化趋势，这种趋势在常量、微量及稀土元素等方面都有反映。通过化学成分的变化，并利用典型的构造环境中花岗岩的数据及数学手段建立的一套判别方法，可以用来判别花岗岩形成的大地构造环境。

Granites and Their Tectonic Setting

There is a genetic relationship between the granites and their tectonic setting. Because activity of magma is controlledby the tectonic environment. In every stage of crustal evolution, the component of granites shows out a regular tendency, in which the major, trace and rare earth elements were changed. A serial methods were set up by mathematical models with granites in the typical tectonic environments. There are two diagrams for the tectonic interpretation especially for extentional environment. One is AFC diagram which is a reflection of major element in various grantic rocks. Another is F1-F2 diagram which is set up by step-discriminatory analysis. The methods to calculate the parameter ofdiagrams are showed in the paper. They can be used to discriminate the tectonic environment in which the granite sets.