中文摘要：

燕山地区冀北坳陷雾迷山组为一套碳酸盐岩潮坪沉积,区内角砾云岩分布较广泛。角砾云岩以棱角—次棱角状为主,大小相差悬殊,自数厘米至数十厘米不等;角砾岩体与围岩的接触界限十分清楚,呈港湾形。结合区域地质背景、岩石学特征,通过镜下鉴定和微量元素分析,对研究区角砾云岩的成因进行了探讨,研究表明：该区角砾岩是早期形成的白云岩在水体相对较深的潮间带,经构造运动的切割及淡水溶蚀改造,再经充填、沉淀和成岩作用而形成的。

英文摘要：

Wumishan formation in northern Hebei depression of YanShan region is a set of carbonate tidal flat deposits,dolomite breccia widely distributes in the area.Angle-subangular are dominated shape and the size of beccia are quite different,ranging from a few centimeters to tens of centimeters;The boundaries of breccia and adjacent rocks are very clear,showing the shape of harbor.The paper discusses the genesis of dolomite breccia in the area through identification with microscope and trace elements analysis,combined with the regional geological background and the lithology characteristics.The research indicates：The breccia was formed from dolomite,which experienced chipping of tectonic movements and corrosion in fresh water and then backfilling,deposition and diagenesis in intertidal zone where water was relatively deep.