辽西蓟县系雾迷山组震积岩的发现及其构造意义

辽西蓟县系雾迷山组发育两层震积岩，分别位于雾迷山组一段的中上部及二段的下部，其表现形式为碳酸盐岩中的振动液化泥晶脉及少量层内褶曲，可视为一个主地震活跃期的两次地震事件，为区内首次发现，填补了区内震积岩的空白。地震事件与大陆板块的开裂与拼接有着直接的联系，本次震积岩的发现，对燕山裂陷槽的开裂与扩张，提供了有利证据，对中朝准地台的板块活动解释起着一定作用。

DISCOVERY OF SEISMITE IN WUMISHAN FORMATION OF JIXIAN SYSTEM IN WEST LIAONING AND ITS TECTONIC SIGNIFICANCE

Two beds of seismite were discovered in the midupper part of Member 1 and in the lower part of Member 2 of Wumishan F. of Jixian System in West Liaoning,which was the first discovery in the area and filled the gap of seismite.In the two beds of seismite,there developed vibration liquefied micritic veins and a few of intrafolial folds in carbonate,which were considered to be resulted from two earthquake events of a major earthquake active period.An earthquake event is directly related with splitting and matching of plates,so the discovery of seismite can provide powerful evidences for the interpretation to the splitting and spreading of Yanshan faultdepression trough, and even to the activities of plates in SinoKorean paraplatform.