摘要
大兴安岭中南段铜成矿带已探明铜矿床众多,矿化类型主要为热液脉型与斑岩型.布敦化铜矿床由于同时存在两种矿化类型而备受关注,然而针对该矿区内相邻两个矿段(金鸡岭、孔雀山)成矿特征差异性缘由尚未得到解释,有关该矿床成矿机制综合研究尚显薄弱,整体成矿模式亟待建立.在综合前人研究成果基础上,认为布敦化矿区如此小范围内存在两种矿化类型,有可能与晚侏罗世成矿阶段构造演化的不同相关。布敦化挤压带两侧地质体发生垂向位移,孔雀山矿段所在部位(上盘)相对上升,得以形成浅成高温热液脉型铜矿.(165±2)^(151.95±0.73)Ma,极有可能在金鸡岭矿段深部存在当时未上升的黑云母花岗闪长岩,其内、外接触带极有可能形成浸染状铜矿化,可以作为今后该矿段找矿方向.在上述认识基础上构建布敦化铜矿床成矿模式,为揭示大兴安岭中南段铜多金属成矿规律奠定基础.
A mount of copper deposits, with mainly hydrothermal vein type and porphyry type, are found in the middle- south section of Daxinganling Mountains. Among them, the Budunhua copper deposit attracts particular attention because it owns both of the mineralization types in one deposit. However, the reason for the different metallogenic characteristics has not been well explained. Based on a summarization of previous reset：rches, this paper concludes that the mineralization state of the deposit is probably related to the differences of tectonic evolution between the two ore blocks （Jinjiling and Kongqueshan） during the Late Jurassic metallogenic stages. Due to the vertical displacement of geological bodies on both sides of the Budunhua compressional belt, the Kongqueshan ore block on the hanging, wall was raised up relatively and formed copper deposit of epithermal vein type. In the period of （165±2） to （151.95±0.73） Ma, it is possible that biotite granodiorite existed in the deep of Jinjiling ore block on the footwall and formed disseminated copper mineralization in the inner or outer contact belt of the intrusive rock, which could be a prospecting direction for this ore block. Finally, the ore-forming model of Budunhua deposit is established for the research of the polymetallic metallogenic regularity in middle-southern Daxinganling Mountains.
出处
《地质与资源》
CAS
2017年第1期5-12,共8页
Geology and Resources
基金
中国地质调查局"大兴安岭塔尔其地区专项填图与技术应用示范"项目(编号12120115033401)
关键词
布敦化铜矿床
成矿模式
热液脉型
斑岩型
大兴安岭
Budunhua copper deposit
metallogenic model
hydrothermal vein type
porphyry type
Daxinganling Mountains
