K-METASOMATISM OF PLAGIOCLASE TO PRODUCE PERTHITE IN GRANITIC ROCKS OF ZHEJIANG PROVINCE,SOUTHEAST CHINA

The perthitic feldspars described in this study are in granites of Zhejiang Province in which the perthite textures appear to have formed as a result of a specific sequences of metasomatic events at the deuteric stage of crystallization and in a chemical environment in which K-metasomatism was enrichment. Perthite textures commonly found in potash feldspars in granitic rocks have generally been attributed to one of two well-established modes of occurrence, either exsolution or replacement process.