甘肃大水金矿床方解石的稀土元素地球化学特征  

Geochemical characteristics of rare earth element of calcite in Dashui gold deposit,Gansu province

作　　者：代文军[1] 陈耀宇[1] 马小云[1] 史文全[1] 

机构地区：[1]甘肃省地矿局第三地质矿产勘查院

出　　处：《黄金》2011年第2期24-29,共6页Gold

摘　　要：方解石是大水金矿床脉石矿物之一,其形成贯穿整个成矿过程。根据野外观察和室内分析,大水金矿床中的方解石分为矿化期前、矿化期和矿化期后3期。通过对不同产出类型方解石稀土元素地球化学特征研究表明:不同产出类型的方解石稀土元素含量、有关参数和配分模式均有不同程度的差别,显示不同来源;矿床成矿流体具多来源特征。成矿环境表现为相对开放而氧化的环境。Calcite is one of the gangue minerals in Dashui gold deposit and its formation last in the whole mineralization process.Based on field observation and lab analysis,the calcite can be divided into 3 phases,before contemporary and after mineralization phase.By analyzing the geochemical characteristics of calcite rare earth elements,it is found that the rare earth element content,parameters and ree distribution pattern are different for various types of calcite,that shows the different sources of calcite.The ore-forming fluid has the character of multi-sources.The ore-forming environment is a relatively open and oxidative one.

关 键 词：方解石 稀土元素 地球化学 大水金矿床 甘肃 

分 类 号：P618.51[天文地球—矿床学] P597.2[天文地球—地质学]