内蒙古车户沟斑岩型铜钼矿区矿石特征及成因探讨

The Characteristic and Genesis of Porphyry Copper Molybdenum Deposit from Chehugou, Inner Mongolia

内蒙古车户沟矿区铜钼矿是近年来在大兴安岭多金属成矿带中段发现的典型斑岩型铜钼矿床,花岗斑岩体形成于印支期。属于西伯利亚板块和华北板块碰撞后从挤压向拉张的构造环境。铜钼矿化与隐爆角砾岩体关系密切,区内岩浆活动强烈,中酸性斑岩体活动晚期,富金属(铜钼)组分、富气液岩浆上升到地壳浅部,当气液压力大于围岩静岩压力时,气液发生沸腾作用,同时发生引爆作用,造成温度、压力下降,物理化学条件发生改变,导致成矿物质(铜钼)沉淀成矿。对其矿床成因进行探讨研究,为今后的找矿、探矿提供新的思路。

Chehugou Mo- Cu deposit, located in Inner Mongolia, is a typical porphyry Mo- Cu deposit found in the Great Khingan polymetallogenic belt recently, The granite porphyry formed in Indosinian Age, resulting from collision of the north China plate and Siberia plate from the extrusion to extensional tectonic environment. Copper and molybdenum mineralization closely associate with the cryptoexplosive breccias. Strong magmatic activities are found in this area. In the late mid- acid porphyry activities, the magmatic which is rich of metal(Mo- Cu) components and vapor- fluid migrates to shallow regions of the crust. When vapor- fluid pressure is bigger than surrounding rock pressure, gas and liquid are in boiling. Concurrently, the temperature and pressure drop and the physical and chemical conditions of the system were changed with concealed explosion, leading to metallogenic material precipitation. Based on analyses of metallogenic characteristic and ore genesis, future ore prospecting is proposed.