Genetic relationship of metamorphic reaction and dehydration-melting --Example from Al-rich gneiss of khondalite series on the border of Jin(Shanxi Province)-Inner Mongolia

The high temperature and pressure experimental data of garnet, sillimantite and biotite bearing potash feldspar gneiss (SGBG, natural block rock) has shown that metamorphic reactions between garnet and melt, and mineral assemblage evolutional features are not only controlled by P T condition, but also genetically correlate with dehydration melting of biotite and partial melting of felsic minerals. Combining experimental data with theoretical analyses, the genetic mechanism of metamorphic reaction and its dynamic significance have been demonstrated in the process of metamorphic evolution of khondalite series on the border of Jin(Shanxi Province) Inner Mongolia.