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引用本文:黄 凡1 王登红1 陈毓川2 王成辉1 唐菊兴1 陈郑辉1 王立强1 刘善宝1 李建康1 李 超3 张长青1 应立娟1 王永磊1 李立兴1. 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.
HUANG Fan1, WANG Deng-hong1, CHEN Yu-chuan2, WANG Chen-hui1, TANG Ju-xing1, CHEN Zheng-hui1, WANG Li-qiang1, LIU Shan-bao1, LI Jian-kang1, LI Chao3, ZHANG Chang-qing1, YING Li-juan1, WANG Yong-lei1, LI Li-xing1. REE characteristics of molybdenites from endogenous molybdenum deposits in China[J]. Geology in China, 2013, 40(1): 287-301(in Chinese with English abstract).
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中国钼矿中辉钼矿的稀土元素地球化学及其应用
黄 凡1 王登红1 陈毓川2 王成辉1 唐菊兴1 陈郑辉1 王立强1 刘善宝1 李建康1 李 超3 张长青1 应立娟1 王永磊1 李立兴1
1.国土资源部成矿作用与资源评价重点实验室, 中国地质科学院矿产资源研究所, 北京 100037;2.中国地质科学院, 北京 100037;3.国家地质实验测试中心, 北京 100037
摘要:
提要:钼矿是中国比较特殊的一个矿种,是近年来找矿突破最大的矿种之一。辉钼矿作为最具工业意义的含钼矿物,广泛分布于各种内生钼矿床中。本文尝试性地对内生独立钼矿或共伴生钼矿矿床中的辉钼矿进行了ICP-MS稀土元素分析。结果表明,各矿床辉钼矿中稀土总量在10.99~3374μg/g,集中在10.99~600μg/g。时间上,中侏罗世—早白垩世辉钼矿稀土元素含量最高;空间上,北方矿床中辉钼矿的稀土总量较南方高;矿种组合上,独立钼矿、以钼为主的多金属矿中稀土总量要大于其他伴生钼矿矿床。辉钼矿稀土元素配分曲线具有多样性,不同矿集区内矿床成矿时代、矿床类型与矿种组合对稀土元素配分模式影响不明显。辉钼矿中明显富集轻稀土,具有强烈的Eu负异常(δEu=0.01~0.80)、Ce负异常(δCe=0.24~1.06,多数δCe值<1)和Sm正异常(δSm=1.29~79.42)。依据辉钼矿轻稀土富集程度、Sm和Eu等稀土元素异常特征,将辉钼矿稀土元素配分模式分为6类,反映了不同辉钼矿成因或成矿流体性质的差异性;依据LREE、HREE、δEu和δCe等特征,以及熔体/流体实验结果,推测成钼流体总体上是以富CO2、Cl-(个别还富含F-)和还原性气体成分的成矿流体。内生金属矿床中辉钼矿主要形成于还原性环境,但石英脉型矿床较斑岩型矿床形成条件明显氧化性增强。
关键词:  辉钼矿  稀土元素  配分模式  成矿流体  还原环境
DOI:
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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。
REE characteristics of molybdenites from endogenous molybdenum deposits in China
HUANG Fan1, WANG Deng-hong1, CHEN Yu-chuan2, WANG Chen-hui1, TANG Ju-xing1, CHEN Zheng-hui1, WANG Li-qiang1, LIU Shan-bao1, LI Jian-kang1, LI Chao3, ZHANG Chang-qing1, YING Li-juan1, WANG Yong-lei1, LI Li-xing11,2,3,4
1. MRL Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;2. Chinese Academy of Geological Sciences, Beijing 100037, China;3. National Research Center for Geoanalysis, CAGS, Beijing 100037;4.China
Abstract:
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 3374μg/g (concentrated between 10.99 and 600μg/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 (δEu= 0.01~0.80), negative Ce anomalies (δCe=0.24~1.06, Most are less than 1) and positive Sm anomalies (δSm=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.
Key words:  molybdenite  REE  distribution patterns  ore-forming fluids  reducing environment