朱溪钨铜矿床深部石英脉型黑钨矿成因及其地质意义  

Genesis and geological significance of quartz vein-type wolframite in the deep of Zhuxi W-Cu deposit

作　　者：欧阳永棚 曾闰灵 舒立旻 邓友国 饶建锋 魏锦 OUYANG Yongpeng;ZENG Runling;SHU Limin;DENG Youguo;RAO Jianfeng;WEI Jin(School of Earth Sciences and Mineral Resources,China University of Geosciences(Beijing),Beijing 100083,China;The Tenth Geological Brigade of Jiangxi Geological Bureau,Yingtan 335001,China)

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100038 [2]江西省地质局第十地质大队,江西鹰潭335001

出　　处：《桂林理工大学学报》2023年第2期184-192,共9页Journal of Guilin University of Technology

基　　金：江西省科技厅重点研发计划项目(20212BBG73045);江西省地质局青年科学技术带头人培养计划项目(2022JXDZKJRC02);江西省科学技术厅国家科技奖后备项目培育计划项目(20203AEI91004);江西省地质矿产勘查开发局地质科研项目(赣地矿字〔2017〕78号);江西省地勘基金项目(20200022,20150013)。

摘　　要：近年来赣东北地区发现的朱溪大型钨(铜)矿床,以发育矽卡岩型、蚀变花岗岩型、云英岩(石英)脉型和似层状白钨矿体为主,最近在ZK4213钻孔深部花岗岩体中首次发现石英脉型黑钨矿体。在野外编录和岩矿鉴定基础上,对该石英脉型黑钨矿进行了电子探针分析,其中WO_(3)含量为74.3%~76.7%(平均75.7%),MnO为12.8%~13.8%(平均13.2%),FeO为10.3%~11.6%(平均11.1%),FeO/MnO值为0.75~0.90(平均0.85),晶体化学式为(Fe_(0.43-0.49)Mn_(0.54-0.59))_(1.01-1.05)W_(0.98-0.99)O_(4),属于铁钨锰矿系列。黑钨矿相对富锰的特征指示其可能形成于相对高温、偏还原的弱酸性环境。结合矿区成岩成矿作用研究,初步认为朱溪地区可能经历了多期成岩成矿作用,即在晚侏罗世主成岩成矿期之后,可能又经历过新的成岩成矿事件。朱溪矿区深部新发现的石英脉型黑钨矿体也极有可能为该新一期成矿事件的产物。The Zhuxi deposit is a large W-Cu deposit discovered in northeastern Jiangxi province,which is dominated by skarn type,altered granite type,vilinization or quartz vein-type and quasi-layered type of scheelite and chalcopyrite.Recently,a quartz vein-type wolframite orebody is discovered for the first time in the deep granite of the ZK4213.Based on detailed field cataloging and petrography and mineralogy identification,electron probe analysis is conducted on Zhuxi wolframite.The analysis results show that WO3 content in the wolframite is 74.3%-76.7%(avg.75.7%),MnO is 12.8%-13.8%(avg.13.2%),and FeO is 10.3%-11.6%(avg.11.1%).The ratio of FeO/MnO for the wolframite is 0.75-0.90(avg.0.85).According to the analysis,the chemical formula of wolframite crystal is calculated as(Fe_(0.43-0.49),Mn_(0.54-0.59))_(1.01-1.05)W_(0.98-0.99)O_(4),which belongs to the Iron-bearing huebnerite series.Wolframite generally shows a slightly relatively rich manganese characteristic,indicating a relatively high formation temperature,partial reduction,and weakly acidic environment.Based on the existing studies of diagenesis and mineralization in Zhuxi area,it is preliminarily believed that the Zhuxi area might have experienced multiple stages of diagenesis and mineralization.Zhuxi area might have experienced another stage of diagenesis-mineralization after the main period of the Late Jurassic(-150 Ma).The quartz vein-type wolframite in deep Zhuxi deposit might be possibly the product of the later mineralization.

关 键 词：黑钨矿 花岗岩 石英脉型 成岩成矿作用 朱溪 

分 类 号：P618.670.1[天文地球—矿床学]