滇西小龙河锡矿床、来利山锡矿床萤石、方解石微量元素地球化学特征  

Trace Element Geochemistry of Fluorite And Calcite from the Xiaolonghe Tin Deposits and Lailishan Tin Deposits in Western Yunnan,China

作　　者：曹华文[1,2] 张伟[3] 裴秋明 张寿庭[2] 郑硌[2] CAO Hua-wen ZHANG Wei PEI Qiu-ming ZHANG Shou-ting ZHENG Luo(Chengdu Center, China Geological Survey, Chengdu 610081, China School of Earth Sciences and Resources, China University of Geosciences（ Beijing）, Beijing 100083, China Regional Geological Survey Party, Sichuan Bureau of Geology and Mineral Resources Exploration, Chengdu 610213, China)

机构地区：[1]中国地质调查局成都地质调查中心,成都610081 [2]中国地质大学(北京)地球科学与资源学院,北京100083 [3]四川省地质矿产勘查开发局区域地质调查队,成都610213

出　　处：《矿物岩石地球化学通报》2016年第5期925-935,共11页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家十二五科技支撑计划项目(2011BAB04B06);中国地质调查局地质调查项目(1212011220925);中国地质调查局基础性公益性地质矿产调查项目(DD20160015);国土资源部公益性行业科研专项(201111007-4)

摘　　要：为研究滇西小龙河锡矿床和来利山锡矿床的成矿流体演化特征和矿床成因，采用等离子质谱法（ICP-MS）对2个矿床中的脉石矿物萤石和方解石进行了微量元素和稀土元素分析测试。结果表明，小龙河矿床萤石的稀土元素总量（REE）为12.86×10－6～2275.96×10－6，具有弱的负Ce异常和强的负Eu异常，相对富集Rb、Th、U、Pr、Nd和Sm等元素。来利山矿床方解石的REE值低，为3.18×10－6～29.16×10－6，具有弱的负 Ce异常，相对富集 Rb、Ba、Th、U、Sr和 Eu 等元素。2个矿床的Y／Ho-La／Ho图解和 Tb／Ca-Tb／La图解指示萤石和方解石均为热液成因。小龙河矿床成矿物质主要来源于岩浆热液，随着成矿流体的演化，后期明显带有沉积地层物质加入，而来利山矿床成矿物质主要来源于围岩地层。In order to study characteristics of the ore-forming fluid and metallogenesis of the Xiaolonghe and Lailishan tin deposits in the Western Yunnan,trace elements and REE of fluorites and calcites from these two deposits have been ana-lyzed by using ICP-MS（Thermo Scientific X Series 2）in this paper.The results show that fluorites of the Xiaolonghe de-posit have REE contents of 1 2.86×1 0-6~2275.96×1 0-6,and are rich in Rb,Th,U,Pr,Nd and Sm,with strong neg-ative Eu anomaly and weak Ce anomaly in the REE patterns.Calcites of the Lailishan deposit are poor in the REE（3.1 8 ×1 0-6~29.1 6×1 0-6）,but rich in Rb,Ba,Th,U,Sr,and Eu,with weak Ce anomaly in their REE patternd.Fluorites and calcites of these two deposits are believed to be hydrothermal genesis based on the Y/Ho-La/Ho and Tb/Ca-Tb/La di-agrams.In addition,with the evolution of the ore-forming fluid,the ore-forming materials of the Xiaolonghe deposit were mainly sourced from the magmatic hydrothermal fluid,with the input of the sedimentary strata materials in the late stage. However,the ore-forming materials of the Lailishan deposit were mainly sourced from the strata.

关 键 词：方解石 萤石 稀土元素 小龙河 来利山 滇西 

分 类 号：P618.44[天文地球—矿床学]