大兴安岭东南部太平山地区断裂控矿作用及控矿应力场

根据控矿断裂构造的分期配套及其交切关系研究 ,发现大兴安岭东南部太平山地区内生金属矿床的形成与中生代多次转换的区域构造应力场及其所形成的断裂直接相关。太平山地区在中生代经历了 4期具不同区域构造应力场的控矿构造运动 :①晚侏罗世晚期至早白垩世早期 ,形成NEE走向的矿化隐爆角砾熔岩带 ;②早白垩世晚期 ,造成了大量近EW (或NWW )和NW (或NNW )走向的共轭张_张扭性断裂 ,该期为主成矿期 ;③晚白垩世 ,形成并复活了近SN向 (或NNE向 )和NE65°的两组共轭张扭性断裂 ,沿断裂充填了中酸性脉岩和铁矿 ;④晚白垩世之后 ,发育NNW向挤压的区域构造应力场

Ore-controlling Role of Fractures and Ore-controlling Stress Field in Taipingshan Area, Eastern Inner Mongolia

Researches show that the formation of endogenic metallic ore deposits in Taiping shan area is directly related to various tectonic stress fields and the formatio n of fractures in Mesozoic. The area has mainly experienced 4 epochs of ore_ controlling structural movement, which took place respectively in late stage of Late Jurassic to early stage of Early Cretaceous, late stage of Early Cretaceous , Late Cretaceous and a period later than Late Cretaceous. Among these four epoc hs, the late stage of Early Cretaceous seems to be the major ore_forming stage, during which large quantities of nearly EW_ (or NWW_) and NW_ (or NNW_) trending conjugate tensional and tensional_shear fractures were formed under the action of NW_trending compressive regional tectonic stress field, and magmatic hydrothe rmal solution was emplaced along the fractures, forming ore (mineralization) bod ies at favorable positions.