论青杨沟岩组

Discussion on Qingyanggou Rock Group

吕梁山区上太古界吕梁群从1967年建立起,经过层序颠倒、组级个数多次缩减,几次重大修正,青杨沟组在其中起着重大的作用。建组初期就认为它的岩性变化太大;经过层序颠倒,发现它与下伏地层成角度不整合接触;为了与五台山对比,扩大了它的容量;最终认识到组内及上下有一系列韧性断层顺层切过,其中断体分别可与吕梁群及上下地层能对比;因而判定它是被一系列韧性断层所分隔并把不同时代地层挤到一起的构造组合体。最终导致其上的吕梁群失去了底界。从縻棱岩中发现它经历了两期构造运动;从变质带突变认识到早期是上下运动;从吕梁群地层走向突变,判定它晚期作水平运动。因之,青杨沟岩组具有丰富的地质内涵可待发掘。

Lvliang rock Series was built in 1967, in which Qingyanggou rock group was very inportant. The group shows large variance and contacts with lower seam unevenly. Throug fruther research, it is determined the group wsa seperated by a series of fault and extruded from different seams, so that it let lvliang rock series lost obvious low surface; and the group .has two times structure movement including early rising and later horizontal movement. However, Qingyanggou rock group still has abundant geological content to be discovered.