云南禄劝噜鲁铅锌矿床稀土元素和微量元素地球化学  

Rare Earth Elements and Trace Element Geochemical of Lulu Lead-Zinc Deposit in Luquan County,Yunnan Province

作　　者：王文元[1] 高建国[1] 侬阳霞 陈欣彬 Wang Wenyuan Gao Jianguo Nong Yangxia Chen Xinbin(Department of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, Chin)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093

出　　处：《中国稀土学报》2017年第3期418-430,共13页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(41272111)资助

摘　　要：云南禄劝噜鲁铅锌矿床位于扬子地块西南边缘,矿石矿物主要为方铅矿、闪锌矿、黄铁矿,对该矿床进行了系统的稀土元素和微量元素分析测试。结果表明:赋矿围岩中稀土元素总量(∑REE)变化范围介于(1.480~69.030)×10^(-6)之间,轻稀土元素相对富集。两期黄铁矿稀土及微量元素存在一定的差异,一期黄铁矿δEu显示强负异常,δCe值弱负异常,配分模式与赋矿围岩相似,二期黄铁矿δEu值显示正异常,δCe值表现强负异常。成矿流体为多来源,成矿环境可能存在一个相对还原向相对氧化的变化过程。两期黄铁矿HFSE亏损,Nb/La,Th/La值均<1,Hf/Sm仅有部分值>1,表明成矿流体可能为富Cl流体,成矿流体可能遭受了外来热液的混入,两期黄铁矿Co/Ni比值较小,表明成矿温度为中低温。第一期黄铁矿Y/Ho(25.909~44.429)较第二期Y/Ho(4.617~23.600)比值大。黄铁矿Y/Ho比值表明赋矿地层有可能为第一期黄铁矿提供了成矿流体来源,第二期黄铁矿Y/Ho比值部分落入峨眉山玄武岩范围内,峨眉山玄武岩有可能为成矿提供成矿流体。Lulu lead-zinc deposit is located on the southwestern margin of the Yangtze block . The ore minerals are composed of galena, sphalerite, and pyrite. This paper made a REE systematical analysis on this deposit. The scope of ∑REE in the host rock varied between 1. 480 -69. 030×10^-6, with LREE enriched. There are some differences between REE and trace elements of two stage pyrite. It appeared that Eu was strong negative anomaly and Ce was value weak negative anomaly on pyrite of the first stage, which is similar to the host rock. The pyrite of second stage was positive Eu anomaly and strong negative Eu anomaly. The ore-forming fluid was a multi source; There may be a process of weak oxidation to the relative oxidation. Two period pyrite HFSE lost. Their Nb/La, Th/ La ratios were almost less than 1, only part of Hf/Sm ratios were almost more than 1, indicating that the ore-form- ing fluid might be C1 rich fluid and the ore-forming fluid might have been mixed with foreign hydrothermal fluids. The Co/Ni ratio of two period pyrite indicated that the ore-forming temperature was relatively low temperature. The Y/Ho ratio of pyrite showed that ore formation is likely to provide a source of ore-forming fluid for the first stage py-rite. The Y/Ho ratios of the second stage pyrite falled into the range of Emeishan basalt, indicating the basalt may provide ore-forming fluid for mineralization.

关 键 词：矿床地质特征 稀土元素 成矿环境 成矿流体 噜鲁铅锌矿床 

分 类 号：P595[天文地球—地球化学]