黑龙江鹿鸣斑岩型钼矿床Re-Os同位素定年及其地质意义  

Re-Os isotopic dating and geological significance of Luming porphyry molybdenum deposit in Heilongjiang

作　　者：孙庆龙[1] 孙景贵[1] 赵克强[1] 唐臣 张勇[1] 韩世炯[1] 杨帆[1] 

机构地区：[1]吉林大学地球科学学院,长春130061 [2]黑龙江地质调查研究总院,哈尔滨150036

出　　处：《世界地质》2014年第2期418-425,共8页World Geology

基　　金：国家自然科学基金(41172072);黑龙江省矿产资源潜力评价(1212011121006)联合资助

摘　　要：黑龙江鹿鸣钼矿床是近年来新发现的特大型钼矿床,矿体呈浸染状赋存于燕山早期的二长花岗岩中,属典型的斑岩型钼矿床。笔者对鹿鸣钼矿床的辉钼矿进行了Re-Os同位素测试分析,结果显示:辉钼矿中Re含量为11.896～15.714μg/g,矿床的成矿物质来源为壳幔混合源,以壳源为主;Re-Os模式年龄为(180.2～185.9)Ma,加权平均年龄为(183.4±2.2)Ma。结合最新的赋矿围岩成岩年龄,显示成矿与成岩同时或稍晚于成岩,即鹿鸣钼矿床形成于早侏罗世,为小兴安岭—张广才岭成矿带燕山早期大规模构造-岩浆-成矿事件的产物,成矿与古太平洋板块的俯冲有关。Luming molybdenum deposit is a newly discovered large-sized porphyry molybdenum deposit.Molybdenum orebodies mainly hosted in Early Yanshanian monzogranite as disseminated shape,belonging to porphyry molybdenum in type.According to the analysis of molybdenite Re-Os isotope from Luming molybdenum deposit,it shows that Re content for molybdenum is range from 11.896 to 15.714 μg/g.Ore-forming materials are derived from crust-mantle mixed source and mainly from crustal source.The Re-Os model age is 180.2 ～ 185.9 Ma and weighted average age is （183.4 ± 2.2） Ma.According to the latest diagenetic age from ore-hosting rock,it indi cates that the metallogenetic age is the same as or slightly later than diagenetic age.Luming molybdenum formed in Early Jurassic,as the product of Early Yanshanian large-scale tectonic-magma-metallogenic event in the Lesser Xing＇an-Zhangguangcai Range metallogenic belt.The metallogenesis is associated with the subduction of Paleo-Pacific.

关 键 词：RE-OS同位素定年 辉钼矿 斑岩型钼矿床 鹿鸣 黑龙江 

分 类 号：P618.65[天文地球—矿床学] P597[天文地球—地质学]