内蒙古边家大院铅锌银矿地质特征和控矿因素

Geological Characteristic and Control Factors in Bianjiadayuan Pb-Zn-Ag Deposit,Inner Mongolia

边家大院矿床成因类型根据目前勘查成果认为是与浅成-超浅成侵入岩(脉)有关的热液型脉状铅锌银矿床,主要矿化产于砂板岩、闪长岩中。平面上成矿元素具有明显的分带性,自西向东有斑岩型锡(钼、铜)矿化→隐爆角砾岩型锌(铅、银)矿化→脉状充填型银(铅、锌)矿化;本文根据矿床地质特征分析,对控矿因素进行了总结,认为隐伏的石英斑岩脉(体)是本矿床成矿热源中心,也是成矿流体的主要来源;脉状铅锌银矿体受低次序密集裂隙(断裂)带的控制,并与岩脉、岩脉群密切相关,以脉状充填形式产于其中。

Our exploration suggests that Bianjiadayuan deposit is a hydrothermal veinlike plumbum-zincum-argent deposit concerned about hypabyssal and ultra-hypabyssal rock,and the major Mineralization is formed in sandstond,slate and diorite.The ore-forming element is shown zonality at the level,which is characterised at porphyry-type stanum （molybdenum,cuperum） mineralization,porphyry-type zincum （plumbum,argentum） mineralization and veinlike filling-type argentum （plumbum,zincum） mineralization from western to eastern.We analyse the control factors based on the geological characteristic of ores in this paper,which considers that the buried quartz porphyry vein （or pluton） is the major source of ore-forming fluids and heat.The veinlike plumbum-zincum-argentum orebody controled by the sub-ordered and tight fissures （ruptures）,and isconsanguineously related to dvke and dvke swarms,and producted in nervation filling.