内蒙古大青山地区构造特征与成矿关系

内蒙古大青山地区的临河-集宁断裂带是华北板块北缘的一条重要断裂带,它主要由韧性剪切带、韧脆性剪切带和推覆构造等构成.推覆构造自南向北可分为叠瓦逆冲推覆构造带、紧闭褶皱一逆冲断层变形带、宽缓褶皱-断层转折褶皱带、滑脱褶皱-断层传播褶皱带等4个变形带.断裂带从韧性到脆性表示了其出露深度不同,并有由南到北活动强度逐渐减弱的趋势.该区主要分布有以金为主的多金属矿床和以煤、大理岩为主的非金属矿床.区内金多金属矿床多与韧性剪切带有关,断裂构造为金属矿床的形成提供了空间,也是成矿物质的通道.研究指出了该地区的找矿前景与方向.

TECTONIC FEATURES AND RELATIONS TO ORE DEPOSITS IN THE DAQINGSHAN REGION, INNER MONGOLIA

Linhe-Jining fault in the Daqingshan area, Inner Mongolia, is an important fault zone in the north margin of North China Craton. The fault consisted of ductile shear zone, ductile-brittle shear zone and thrust nappe zone. The nappe structures in the area was formed in later Cretaceous and belonged to the large-scale ramp structure which is stronger in south and weaker in the north. In the area, the main polymetallic mineralization is gold deposits and the nonmetallic mineralization is coal and marble. Polymetallic mineralization has a close relation with tectonics, especially with fracture structures offering the depositing and mineralizing spaces. Thrust nappe structure made the Mesozoic coal basin strata to fold, duplicate and conceal. The research results provided exploration prospecting and orientations in the area.