一、引言地洼区是地壳发展经历了地槽阶段及地台阶段后,继续往前发展,由地台区转化而成的一个新的基本构造单元。当笔者初提出这种新构造区的时候,本来建议名为“活化地台”或“地台活化区”(简称“活化区”)。这两名称已为大家所熟识并使用。但因“活化地台”一名有缺点,即易被误解为地台区的一种,或被误解为等同于“准地台”,而不能表达 I. INTRODUCTION The depression area is a new basic structural unit transformed from the platform area after the development of the crust has gone through the stage of geosyncline and terrace. When I first proposed this new tectonic zone, I originally proposed the name of “activated tectonic platform” or “platform activated zone” (“Activated Zone” for short). These two names are familiar to everyone and use. However, one disadvantage of “activating platform” is that it is easily misunderstood as a kind of platform or is misunderstood as equivalent to “platform” and can not be expressed