论文部分内容阅读
内蒙古白乃庙铜矿床位于兴蒙造山带温都尔庙加里东增生带铜多金属成矿带。矿床包括南北两个矿带,南矿带矿体产于白乃庙组绿片岩中;北矿带矿体主要产于花岗闪长斑岩体内,其成矿作用复杂,矿床成因争议较大。采用铼锇同位素定年法对矿区的7件辉钼矿单矿物样品进行分析,所获铼锇同位素模式年龄变化范围为(439.6±6.4)～(450.0±6.6)Ma,加权平均值为(446.5±3.5)Ma,获得等时线年龄为(451.2±3.5)Ma,MSWD值为1.3。结合矿床地质特征分析,认为白乃庙铜矿床是在原始喷流沉积作用形成矿源层基础上,经加里东期岛弧花岗闪长斑岩成矿作用形成,矿床成因应属多期叠加成矿。
The Bai’AiMiao copper deposit in Inner Mongolia is located in the Wailong Ore Caledonian copper polymetallic belt in the Xingmeng orogenic belt. The ore deposit includes two north and south ore belts. The orebody of the South ore belt is produced in the limestone of the Bai Nimiao Formation. The ore body of the North ore belt is mainly produced in the granodiorite porphyry and its metallogenesis is complex. Big. The mineralogical analysis of seven molybdenite single mineral samples using Rhenium-Os isotope dating shows that the isotopic pattern of rhenium is changed from 439.6 ± 6.4 to 450.0 ± 6.6 Ma with a weighted average of 446.5 ± 3.5) Ma, with an isochord age of (451.2 ± 3.5) Ma and MSWD of 1.3. Based on the analysis of the geological characteristics of the deposit, it is considered that the Bai’NaiMiao copper deposit is formed on the basis of the original jet flow sedimentation to form the source rock and is formed by the Caledonian island arc granodiorite porphyry mineralization. The ore deposit should belong to multi-period superposition mine.