ON SYNTECTONIC METAMORPHIC MAGMATIC ROCK

The syntectonic metamorphic magmatic rock is a rather special rock type, which represents an intermediate product between metamorphic and magmatic rocks.It results from magmatic crystallization and m tamorphism under the influence of regional tectonic movement,but such metamorphism is not intense enough to modify the original features of the magmatic rocks thoroughly. So it is called syntectonic metamorphic magmatic rock. Its formation is related to the nagnitude of directional pressure that the magma was subjcted to, phases of the magma（solid or plastic） and time under stresses during regional tectonic movement. Its study permits a brief statement of the stages and charactristics of the regional tectonic movement and a full understanding of the phase change in magmatic crystallization and the filter pressing of the mel s and their significance for the formation of rhythmic fine-grained rocks and or—baring finegrained rocks.