江西相山铀矿田深部多金属矿化中黄铁矿微量元素地球化学特征  

Trace-element geochemical characteristics of pyrite in polymetallic mineralization in the depth of the Xiangshan uranium orefield, Jiangxi Province

作　　者：郭建[1] 李子颖[1] 聂江涛[1] 黄志章[1] 李秀珍[1] 王健[1] 司志发 王健菲 GUO Jian;LI Zi-ying;NIE Jiang-tao;HUANG Zhi-zhang;LI Xiu-zhen;WANG Jian;SI Zhi-fa;WANG Jian-fei(CNNC Key Laboratory of Uranium Resource Exploration and Evaluation Technology,Beijing Research Institute of Uranium Geology,Beijing 100029,China)

机构地区：[1]核工业北京地质研究院,中核集团铀资源勘查与评价技术重点实验室,北京100029

出　　处：《岩石矿物学杂志》2020年第3期257-266,共10页Acta Petrologica et Mineralogica

基　　金：核能开发项目(地HXS1403)。

摘　　要：在对相山铀矿田的深部勘查过程中陆续发现了一批铅、锌、银、铜多金属矿化,利用ICP-MS方法对多金属矿化中的重要金属矿物黄铁矿进行了微量元素分析。结果表明,黄铁矿中富集Co、Ni、Cu、Zn、Cd、Sb、Tl、Pb、Bi等微量元素。对比黄铁矿与矿区出露的主要岩浆岩和基底变质岩的LREE/HREE、(La/Yb)N、Y/Ho、Zr/Hf和Nb/Ta特征参数,结果表明多金属成矿流体在上升运移过程中受到变质基底的强烈混染。LREE富集,Hf/Sm、Nb/La和Th/La值小于1的特征表明多金属矿化成矿流体并非为富F流体,与铀成矿流体具有较大差异。微量元素Co含量与Co/Ni特征值显示矿化形成于中低温环境,成矿物质主要来自于基底变质岩。Several kinds of lead, zinc, silver and copper polymetallic mineralization have been discovered in the Xiangshan uranium orefield during the deep exploration. In this paper, the authors used ICP-MS to determine the content of trace elements of pyrite in the polymetallic mineralization. The results show that the pyrites are rich in Co, Ni, Cu, Zn, Cd, Sb, Tl, Pb and Bi. The LREE/HREE,( La/Yb)N, Y/Ho, Zr/Hf and Nb/Ta characteristics of pyrites were compared with those of the magmatic rocks and metamorphic basement, and the results show that the ore-forming fluid of polymetallic mineralization was strongly mixed with metamorphic basement materials during upward movement. The LREE enrichment and the low Hf/Sm, Nb/La and Th/La ratios( less than 1)indicate that the ore-forming fluid of polymetallic mineralization was not rich in F and was significantly different from the ore-forming fluid of uranium. The Co content and Co/Ni ratios show that the polymetallic mineralization occurred in a medium-low temperature environment and the ore-forming materials were mainly from metamorphic basement.

关 键 词：相山铀矿田 微量元素 黄铁矿 成矿流体 江西 

分 类 号：P578.292[天文地球—矿物学] P619.14[天文地球—地质学]