内蒙古阿巴嘎旗必鲁甘干钼铜矿床成矿地质条件与成矿规律研究

Study on Superimposed Halo Characteristics of No.2 Primary Deposits in Hukousaile Copper Deposit in Abag Banner of Inner Mongolia

阿巴嘎旗必鲁甘干钼铜矿床位于二连-东乌成矿带中部,为一大型斑岩型钼矿床。共探求钼金属量405 971t,铜金属量16 008t。矿床受断裂带和晚二叠世林西组与花岗斑岩接触带控制。钼矿床紧紧围绕NE向断裂与接触带交会复合段集中分布。接触带及其附近发育的构造裂隙为铜钼矿容矿空间。NE向断裂下盘为玄武岩或硅质角岩,上盘为含铜钼矿化花岗斑岩及硅质角岩,控制了花岗斑岩及含矿带边界,断层在成矿期及成矿后均有活动,属控岩控矿断裂构造。通过成矿地质条件,找矿规律研究,为下一步区域找矿提供参考依据。

As a large porphyry - type molybdenum deposit, Bilugangan Cu - Mo deposit of Abag Banner is located in the central part of Eren - Dongwu metallogenic belt. The total detected molybdenum reserve is 405971 tons, with copper metal reserve of 16008 tons. Controlled by both the fault zone and the contact zone between upper- Permian Linxi Formation and the granite- porphyry, the molybdenum deposit shows a concentrated distribution firmly around the intersection and composite sites of the NE - striking fracture with the contact zone. The contact zone and its surrounding developed structure fractures provide the host space for the copper - molybdenum ore. The lithology of the NE - striking fracture footwall is basalt or si- liceous hornstone, while the hanging wall rock is copper- molybdenum- bearing mineralized granite- por- phyry or siliceous hornstone, which has controlled the boundary between the granite - porphyry and the ore - bearing belt. This fracture is belonged to the rock - and ore - controlling fault structure, with fault movement happening both in the mineralization period and after mineralization. This study on the metallogenic conditions and metallogenic regularity has provided reference geological basis for the next regional prospecting work.