川西上基拱伟晶岩型铍矿绿柱石矿物化学特征  

Mineralogical Characteristics of the Pegmatite Type Beryl in Shangjigong,Western Sichuan Province

作　　者：罗丽萍[1] 胡军亮 谭洪旗[1] 周涛 Luo Liping;Hu Junliang;Tan Hongqi;Zhou Tao(Institute of Multipurpose Utilization of Mineral Resources,CAGS,Technical Innovation Center of Rare Earth Resources,China Geological Survey,Chengdu,Sichuan,China;College of Earth Sciences,Chengdu University of Technology,Chengdu,Sichuan,China)

机构地区：[1]中国地质科学院矿产综合利用研究所,中国地质调查局金属矿产资源综合利用技术研究中心,四川成都610041 [2]成都理工大学地球科学学院,四川成都610059

出　　处：《矿产综合利用》2021年第5期113-119,共7页Multipurpose Utilization of Mineral Resources

基　　金：中国地质调查项目(DD20190185)资助。

摘　　要：绿柱石作为铍的矿石原料和祖母绿的来源,有重要的工业价值和欣赏价值,其化学组成可以反映形成的物理化学条件。本文通过对川西九龙上基拱伟晶岩型绿柱石开展LA-ICP-MS原位测试,查明不同矿化类型伟晶岩中绿柱石的元素替代机制,探讨上基拱伟晶岩的稀有金属成矿过程和成矿机制。结果表明,九龙上基拱地区绿柱石的SiO_(2)含量为64.25%~67.19%(平均65.82%),Al_(2)O_(3)含量为16.71%~18.54%(平均17.40%),BeO含量为14.97%~16.46%(平均15.67%),富含Li、S、Zn、Se、Cs等微量元素,与标准绿柱石的化学组成存在差异。绿柱石中Si与Al、Be具有明显的负相关性,与Na、Li、Fe、Mg不具相关性,且Cs-Na/Cs和Cs-Mg/Fe图解显示,具高分异演化的特征。Beryl,as the raw material of beryllium ore and the source of emerald,has important industrial value.Its chemical composition can reflect the physical and chemical conditions of its formation.In this paper,LA-ICP-MS in-situ tests were carried out on the beryl of shangjigong pegmatite type to find out the element substitution mechanism of beryl in different mineralization types of pegmatite,and to discuss the rare metal mineralization process and mechanism of shangjigong pegmatite,so as to provide the basis for the exploration and evaluation of beryl in Jiulong area.Results show that the content of SiO_(2) in beryl is 64.25%~67.19%(average 65.82%),the content of Al_(2)O_(3) is 16.71%~18.54%(average 17.40%),and the content of BeO is 14.97%~16.46%(average 15.67%),otherwise is rich in trace elements such as Li,S,Zn,Se and Cs,which is different from the chemical composition of standard beryl.Si has obvious negative correlation with Al、Be,but has no relevance with Na、Li、Fe、Mg.Beryl has the feature of high evolution differentiation according to the diagrams of Cs-Na/Cs and the Cs-Mg/Fe.

关 键 词：松潘-甘孜 川西 绿柱石 伟晶岩 花岗岩 

分 类 号：TD981[矿业工程—选矿]