中国地质2013，Vol.40Issue(1)：287-301,15.
中国钼矿中辉钼矿的稀土元素地球化学及其应用
REE characteristics of molybdenites from endogenous molybdenum deposits in China
摘要
Abstract
As one of special mineral species deposits in China, molybdenum deposits have got considerable prospecting breakthrough in recent years. Molybdenite, widely distributed in a variety of endogenous Mo deposits, is a molybdenum-bearing mineral with the most significant econonic significance. In this study, the authors chose molybdenite from 57 molybdenum deposits for ICP-MS REE dating. The results show that the total REE values in molybdenum deposits are between 10.99 and 3374 μg/g (concentrated between 10.99 and 600 μg/g). The high REE amounts in molybdenite were formed in Yanshanian period (concentrated in the Middle Jurassic - Early Cretaceous), North China has higher REE than South China, and independent Mo deposits or Mo polymetallic deposits have higher REE than other deposits characterized by associated Mo mineral assemblages. REE distribution patterns of molybdenites show diversity, but the patterns are not controlled by metallogenic ages, types and mineral assemblages in different ore concentration areas. Molybdenites are significantly enriched in LREE, and have strong negative Eu anomalies (δ Eu= 0.01～0.80), negative Ce anomalies (δ Ce=0.24～1.06, Most are less than 1) and positive Sm anomalies (δ Sm = 1.29～79.42). According to these characteristics and distribution patterns of REE in molybdenite, 6 categories of molybdenite can be identified, reflecting the different geneses of molybdenite or different natures of ore-forming fluids captured in the process of molybdenite crystallization. Based on the experimental results of melt/fluid, the authors infer that molybdenum-forming fluids are usually enriched in CO2, Cl- (may be also rich in F-) and some reducing gas compositions, indicating a reducing environment. The quartz vein-type deposits, however, were formed in more oxidative environment than porphyry deposits.关键词
辉钼矿/稀土元素/配分模式/成矿流体/还原环境Key words
molybdenite/REE/distribution patterns/ore-forming fluids/ reducing environment分类
天文与地球科学引用本文复制引用
黄凡,王登红,陈毓川,王成辉,唐菊兴,陈郑辉,王立强,刘善宝,李建康..中国钼矿中辉钼矿的稀土元素地球化学及其应用[J].中国地质,2013,40(1):287-301,15.基金项目
中国地质大调查项目全国矿产资源潜力评价"重要矿产和区域成矿规律研究"项目(1212010633901)和"中国矿产地质与区域成矿规律综合研究(中国矿产地质志)项目(1212011220369)"共同资助. （1212010633901）
