大兴安岭地区铜钼矿床成矿区带背景及找矿前景分析  

Analysis of Geological background and Ore-Searching Prospect for the Copper-Molybdenum Deposits in the Da Hingan Ling Area

作　　者：贾盼盼[1] 魏俊浩[1] 巩庆伟 赵万莉 

机构地区：[1]中国地质大学(武汉)资源学院,湖北武汉430074 [2]河南省第一地质勘查院,河南南阳473056 [3]内蒙古自治区第十地质矿产勘查开发院,内蒙古赤峰024005

出　　处：《地质与勘探》2011年第2期151-162,共12页Geology and Exploration

基　　金：国家危机矿山项目(编号:2006020035和2007020047)资助

摘　　要：本文根据区域构造背景和已知铜钼矿床的分布规律,将大兴安岭地区划分为西拉木伦河钼多金属、大兴安岭南段铜钼、大兴安岭北段铜钼和额尔古纳铜钼4个成矿带。归纳了研究区铜钼矿床的成因类型,主要有斑岩型、热液脉型、矽卡岩型等,并就各成因类型进行了典型矿床的举例。对研究区铜钼矿床的时空分布特征进行了总结,并按照典型矿床形成时间的先后顺序,重点探讨了大兴安岭铜钼矿床可能形成的构造背景,即主要与以下阶段有关:西伯利亚板块与中蒙古-额尔古纳地块的后碰撞阶段(>480Ma)、华北板块与西伯利亚板块的后碰撞阶段(250～240Ma)、蒙古-鄂霍茨克洋向南俯冲阶段及其最终闭合后的后碰撞阶段(180～145Ma)、早白垩世以来太平洋板块俯冲所导致的构造伸展阶段(<145Ma)。最后对研究区内铜钼矿床的找矿前景进行了综合评价。最后对研究区内铜钼矿床的找矿前景进行了综合评价,认为西拉木伦河钼多金属成矿带以寻找印支期、燕山期斑岩型钼矿床为主;大兴安岭南段铜钼成矿带以寻找燕山期热液脉状铜矿和斑岩型钼(铜)矿为主;大兴安岭北段铜钼成矿带以寻找早古生代斑岩型铜矿和中生代斑岩型、矽卡岩型铜矿为主;额尔古纳铜钼成矿带以寻找与中生代浅成斑岩有关的斑岩型铜钼矿床为主。Based on regional tectonic setting and distribution of the known copper-molybdenum deposits,the Da Hingan area is divided into four mineralization belts：the Xilamulun river molybdenum polymetallic mineralization belt,the southern Da Hingan Ling Cu-Mo mineralization belt,the northern Da Hingan Ling Cu-Mo mineralization belt and the Ergun Cu-Mo metallogenetical belt.We classify these deposits into three major genetic types：porphyry,hydrothermal vein and skarn type,and describe several newly discovered deposits as typical examples.The time and space distribution of Cu-Mo deposits in the area are summerized.And on the basis of times of deposits,our discussion is focused on the possible tectonic settings of the Da Hingan Ling Cu-Mo deposits,which are related to the following tectonic stages：post-collision between the Siberian plate and Mongolia-Ergun platform（〉480Ma）,post-collision between the Siberian plate and North China plate（250-240Ma）,southward subduction of the Mongolia-Okhotsk ocean and post-collision after its close（180-145Ma）,tectonic extension caused by subduction of the Pacific plate since the early Cretaceous（〈145Ma）.Finally,a comprehensive assessment of the prospecting potential in this region was made.The potential deposits are porphyry Mo deposits of Yanshanian and Indosinian in the Xilamulun river molybdenum metallogenetical belt,hydrothermal vein and porphyry Cu（Mo） deposits of Yanshanian in the southern Da Hingan range Cu-Mo metallogenetical belt,the Early Paleozoic porphyry Cu and Mesozoic porphyry and skarn type Cu deposits in the northern Da Hingan range Cu-Mo metallogenetical belt,and porphyry Cu-Mo deposits related with Mesozoic hypabyssal porphyry in the Ergun Cu-Mo metallogenetical belt.

关 键 词：铜钼矿床 成岩成矿时限 构造背景 找矿前景 大兴安岭 

分 类 号：P618.41[天文地球—矿床学] P618.65[天文地球—地质学]