THE FEATURES OF THE CONCEALED EXPLOSIVE BRECCIA FACIES AND MECHANISM OF ITS FORMATION IN MUJICUN OREFIELD, LAIYUAN, HEBEI
Lu Yifeng Qin Songxian Deng Zhaolun ( China University of Geosciences, Wuhan 430074 )
The concealed explosive breccia facies, significantly developed in Mujicun ore-field, are the later product of diorite-porphyrite which is metallogenctic cognate intrusive mass in this endogenic polymetal orefield. Their formation and distribution are mainly controlled by structures of rock-forming period. On the basis of geological features, concealed explosive breccia facies have been divided into four types: explosion breccia, shattering breccia, flow-intrusive breccia, injection-meta-somatic breccia.