论断裂变质作用

一、引言首先,让我们简略地复习一下变质作用的分类和命名。以地质背景为基础,变质作用一般可以分为两大类:一类是局部变质作用;另一类是区域变质作用。根据变质作用的主要因素,局部变质作用又可分为:（1）接触变质作用,是在岩浆侵入体边缘地带发生的变质作用;其主要因素是热力;其所形成的岩石的主要特征是没有片理构造。（2）压碎变质作用（cataclastic metamorphism）,是限于在断层和逆冲断层及其附近发生的变质作用;其主要因素是压力,所以又常常被称为动力变质作用;其所形成的岩石的主要特征是

ON FRACTURE METAMORPHISM

The term"fracture metamorphism" is proposed for the kind of metamorphism that occurs in association with migmatization and granitization of country rocks in some fracture zones in southern China. It is different not only from the cataclastic metamorphism or dynamic metamorphism in that the country rocks within fracture zones have been subject to migmatization and granitization,but also from the regional thermodynamic metamorphism in that it does not occur in orogenic belts but in fracture zones. In this paper,the author describes three fracture metamorphic belts which have been Studied with a relatively high level,summarizes their general characteristics,and finally discusses their origin.