福建永春美中铍矿床地质特征及成因浅析  

Geological Characteristics and Genesis of Mezhong Beryllium Deposit in Yongchun County,Fujian Province

作　　者：袁远 Yuan Yuan(Fujian Institute of Geology Survey,Fuzhou,350013)

机构地区：[1]福建省地质调查研究院,福州350013

出　　处：《福建地质》2024年第4期255-263,共9页Geology of Fujian

基　　金：福建省地质矿产勘查开发局地勘费项目“福建永安西洋和德化金竹坑地区锂等稀有金属矿调查”“福建德化金竹坑-华安高安地区铍等稀有金属矿调查评价”。

摘　　要：福建永春美中铍矿床位于闽东火山断坳带中段,铍矿体贮存在早白垩世正长花岗岩外接触带的早二叠世船山组—中二叠世栖霞组石灰岩夹钙质粉砂岩地层中,与矽卡岩具有密切的空间关系。矿石矿物为绿柱石和硅铍石,与萤石、黄玉等密切共生。成矿过程经历了早矽卡岩阶段、晚矽卡岩阶段,以及碳酸盐阶段,铍矿化主要发生在晚矽卡岩阶段。初步认为矿床的形成可能与早白垩世高分异花岗质岩浆活动有关,为富F含矿热液与钙质围岩发生交代蚀变的产物,属于矽卡岩型铍矿。美中铍矿床的发现及矿床成因研究,可为区域下一步找矿工作提供新的方向。The Mezhong beryllium deposit in Yongchun county,Fujian Province,is located in middle section of volcanic fault-depression zone in East Fujian.The beryllium ore bodies are mostly hosted in the limestone interbedded with calcareous sandstone of Lower Permian Chuanshan Formation-Middle Permian Qixia Formation of the outer contact zone of the Early Cretaceous syenogranite.The main beryllium ore minerals are beryl and phenakite,which closely coexist with fluorite and topaz minerals.The mineralization process went through prograde skarn stage,retrograde skarn stage,and carbonate stage.Beryllium mineralization mainly occurs in the retrograde skarn stage.The preliminary study shows that,the ore genesis of Mezhong beryllium deposit may be closely related to the Early Cretaceous highly fractionated granitic magmatic activities,which is the product of metasomatism and alteration of calcareous wall rocks by F-rich ore-bearing hydrothermal fluids and genetic type of deposit belongs to the skarn type beryllium deposit.The discovery of the Meizhong beryllium deposit and its ore genesis research can provided new directions for the next exploration work in the region.

关 键 词：美中铍矿床 矽卡岩 地质特征 矿床成因 福建永春 

分 类 号：P618.72[天文地球—矿床学]