浙江铜山源铜多金属矿床铍矿化的发现及其地质意义  

The discovery of beryllium mineralization at the Tongshanyuan copper polymetallic deposit,Zhejiang Province,South China,and its geological significance

作　　者：李晓峰[1,2] 朱艺婷 韦星林 邓宣驰 吴海 胡辉 易先奎 LI XiaoFeng;ZHU YiTing;WEI XingLin;DENG XuanChi;WU Hai;HU Hui;YI XianKui(Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;College of Earth and Planetary Science,University of Chinese Academy of Sciences,Beijing 100049,China;Jiangxi Bureau of Geology,Nanchang 330036,China;The Fifth Geological Brigade of Jiangxi Bureau of Geology,Xinyu 338000,China)

机构地区：[1]中国科学院地质与地球物理研究所,中国科学院矿产资源研究重点实验室,北京100029 [2]中国科学院大学地球与行星科学学院,北京100049 [3]江西省地质局,南昌330036 [4]江西省地质局第五地质大队,新余338000

出　　处：《岩石学报》2024年第9期2611-2620,共10页Acta Petrologica Sinica

基　　金：中国科学院地质与地球物理研究所重点部署项目(IGGCAS-202205)资助.

摘　　要：浙江铜山源铜多金属矿床位于江山-绍兴与丽水-余姚深断裂之间,华夏褶皱系浙东南褶皱带丽水-宁波隆起带中。该矿床矿化带赋矿围岩为元古界八都群堑头组变粒岩,主要受北东向压-压扭性和北西向压扭-张扭性断裂构造控制,铜铅锌矿化类型主要为破碎带蚀变岩型和石英脉型。在野外详细地质调查的基础上,本次研究在该矿床破碎带蚀变岩型矿化带中发现存在明显的铍富集矿化现象,Be含量在15.5×10^(-6)~147×10^(-6)之间。经电子探针和激光拉曼等分析测试,确定铍矿物主要为羟硅铍石,与铍矿化有关的热液蚀变主要为萤石化和碳酸盐化。根据铍矿化产出的地质条件和特点,本文把它划分为一种新的铍矿化类型——变质改造型,推测成矿流体中Be可能以(BeF_(4))^(2-)和[Be(CO_(3))_(2)]^(2-)络合物的形式进行迁移。当富Be成矿热液流体遇到钙铁榴石等含钙的矿物时,热液中的F或者(CO_(3))^(2-)与钙铁榴石中的钙优先结合形成萤石或者方解石,导致(BeF_(4))^(2-)和[Be(CO_(3))_(2)]^(2-)络合物分解,Be以羟硅铍石的形式沉淀下来。铜山源铜多金属矿床变质改造型铍矿化的发现,为区域上寻找同类型铍矿资源提供了良好的范例。另外,在寻找该类型铍矿同时,还应关注Cd、Co、In等关键金属的富集矿化现象。The Tongshanyuan copper polymetallic deposit is located between the two faults of Jiangshan-Shaoxing and Lishui-Yuyao,Lishui-Ningbo Uplift Zone belong to southeastern Zhejiang Fold Belt of the Cathaysia Fold System.The mineralization of this deposit is mainly controlled by northeast-trending and northwest-trending compression faults,and the host rock is the Zhantou Formation of the Proterozoic Badu Group.The mineralization is mainly divided into fractured-zone altered rock type and quartz vein type,respectively.On the basis of systematic geological investigation and the chemical analysis,we found significant enrichment of beryllium in the fractured-zone altered rock type ores,with Be content ranging from 15.5×10^(-6)to 147×10^(-6).Based on the EPMA and Laser Raman Spectroscopy analysis,the beryllium mineral is mainly composed of bertrandite.The fluoritization and carbonation is closely related to bertrandite precipitation,which can be classified as a new type of beryllium mineralization-metamorphic-modified beryllium ores.In this type of deposit,Be may mainly migrated in the form of(BeF_(4))^(2-)and[Be(CO_(3))_(2)]^(2-)complexes in the ore-forming fluid.When the ore-forming fluid encounters Ca-bearing minerals such as andradite,F-or CO_(2)^(-3)in the hydrothermal solution combines with calcium iron to form fluorite or calcite,causing(BeF_(4))^(2-)and[Be(CO_(3))_(2)]^(2-)complexes to precipitate in the form of bertrandite.The discovery of beryllium mineralization at the Tongshanyuan copper polymetallic deposit provides a good example for searching for this new beryllium resources in the area.The paper also suggests much more attention should also be paid to the enrichment and mineralization of other key metals such as Cd,Co,and In in the area when searching for this new type beryllium resources.

关 键 词：变质改造型铍矿 矿床类型 高级变质岩 Cu-Pb-Zn矿床 浙江铜山源 

分 类 号：P618.72[天文地球—矿床学]