内蒙古北山鹿咀子锑矿矿床成因及成矿时代

鹿咀子锑矿属热液脉状锑矿床,以辉锑矿为主要矿石矿物,赋矿围岩为石炭系红柳园组长石石英砂岩、含砾长石石英砂岩及二叠纪辉长岩。成矿物质主要来源于石炭系红柳园组中的玄武岩和安山岩。北西向断裂为成矿流体运移提供了通道,是主要的导矿构造。高角度的北东向走滑断裂切割区内北西向断裂及辉长岩体,是主要导矿及容矿构造。赋矿岩石为沿北东向断裂破碎带产出的碳酸岩化石英脉。芨芨泉辉长岩LA-ICP-MS锆石U-Pb年龄为(276. 6±1. 7) Ma,结合控矿构造特征,认为北东向断裂活动及其伴随的锑矿化时间,至少要晚于276. 6 Ma。

Genesis and metallogenic epoch constraints of Luzuizi antimony deposit of Beishan, Inner Mongolia

The Luzuizi deposit is classified as hydrothermal vein antimony deposit. Its main ore mineral is stibnite and its wall rocks are feldspathic quartz sandstone, conglomerate feldspathic quartz sandstone of Carboniferous Hongliuyuan Formation as well as Permian gabbro.Metallogenic materials are mainly from basalt and andesite in Carboniferous Hongliuyuan Formation.. NW-trending fractures, which served as migration channel of ore-forming fluid, are the main transmitting ore structures. NE-trending fractures, which are high angle strike-slip faults truncating the NW-trending faults and gabbro terrane of the research area, are main transmitting and hosting structures. The ore-hosting rock is carbonated quartz veins generated along fracture zone of the NE-trending fractures. The LA-ICP-MS zircon U-Pb age of gabbro of Jijiquan is (276.6±1.7) Ma. By considering the characteristics of ore-controlled structures, it can be concluded that the time of NE-trending fractures formation and its antimony mineralizing is at least later than 276.6 Ma.