矿床地质2017，Vol.36Issue(5)：1227-1240,14.DOI:10.16111/j.0258-7106.2017.05.012
云南易门铜厂铜矿床碳酸盐矿物微量元素组成研究
Study of trace elements in carbonate minerals of different ores from Tongchang deposit, Yimen, Yunnan
摘要
Abstract
The Tongchang deposit is a medium-large copper deposit in the Yunnan Yimen copper ore belt.There are two types of mineralization including the sedimentary-diagenesis and hydrothermal vein in Tongchang deposit.Geochemical characteristics of rare earth and trace elements in dolomite and calcite from Luoxue Formation were studied with ICP-MS method to further identify the metallogenic characteristics of the two types of mineralization.The results show that in the trace elements composition,the dolomite is enriched in Cu,Pb,Zn,Ba,Bi,Sb,Ga,Ag and depleted in Mo,Cr,Ni,Co,V.The vein-type calcite is enriched in V,Co,Ni,and depleted in chalcophile elements (Cu,Pb,Zn)and incompatible elements (Ba,Be,Rb,Nb,Ta,Zr,Hf,Th,U).In the rare earth elements composition,both have lower total amounts of rare earth elements,with varying degrees of negative Eu anomalies and weak positive Ce anomalies;nevertheless,in the REE patterns,dolomite obviously exhibits right-inclined pattern characterized by enrichment of LREE,calcite is of smoothly right or flat type distribution patterns characterized by slight enrichment of LREE and MREE.Comprehensive analysis indicates that two types of gangue minerals were produced in different metallogenic systems.The dolomite is of sedimentary-diagenesis genesis and was formed in the normal shallow marine environment,with obvious crust source characteristics of metallogenic material.Calcite is of late-hydrothermal genesis,and mineralization involved deep source material.Stratiform ore and vein ore have not the characteristics of "the same period and homologous character".关键词
地球化学/碳酸盐矿物/微量元素/矿床成因/易门铜矿带/铜厂矿床Key words
geochemistry/carbonate minerals/trace element/ore genesis/Tongchang deposit/Yimen copper ore belt分类
天文与地球科学引用本文复制引用
吕俊男,李峰,肖术安,余璨,张志发,刀艳..云南易门铜厂铜矿床碳酸盐矿物微量元素组成研究[J].矿床地质,2017,36(5):1227-1240,14.基金项目
本文得到国家危机矿山接替资源勘查项目(编号:20089943)和云南铜业(集团)股份有限公司科技项目的联合资助 （编号:20089943）
