论同构造期变质岩浆岩

一、前言国际著名的前寒武纪地质学家,英国累斯特大学地质系B.F.温德利教授曾在1983年国际前寒武纪地壳演化讨论会上发言,述及前寒武纪变质岩区某些主要岩石——石英长石片麻岩、黑云片麻岩、黑云角闪片麻岩和黑云紫苏片麻岩的成因问题。例如,二十年前普遍认为苏格兰西北部的石英长石片麻岩是重结晶的沉积岩,但现在则普遍同意它们是由英云闪长岩、花岗闪长岩和花岗岩经重结晶后的产物。在中国,例如冀东变质岩分布区,虽有它的特殊性是否也有它的共性?这诚如B.F.温德利教授建议所说,“西格陵兰、拉

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.