摘要
黔东南从江地虎铜多金属矿床位于江南造山带西南缘的地虎—翁浪—摆容韧性剪切带上。通过铂族元素、铷-锶同位素、钐-钕同位素地球化学特征分析,对该矿床成因进行了研究。结果表明:(1)矿床成矿物质来源具有多源性特征,金属来源与岩浆活动、区域内基性岩浆岩有关,暗示部分成矿物质来源于上地幔熔融程度偏低的岩浆;(2)铜、铅、锌等成矿物质来源于地壳,与区域内隐伏花岗岩有关,推测部分成矿物质来源于花岗岩;(3)区域蚀变岩型金矿床Rb-Sr同位素、Sm-Nd同位素的等时线年龄分别为(691.2±17.9)Ma和(662.3±6.6)Ma,有别于区域内石英脉型金矿的成矿年龄(约400 Ma),表明两者为不同成矿时代的产物。上述分析进一步表明:黔东南地虎铜多金属矿床形成于武陵—雪峰期,成矿与区内隐伏岩体关系密切。
Dihu Cu-polymetallic deposit in Congjiang County in the southeast of Guizhou Province is located in Congjiang Dihu-Wenglang-Bairong ductile shear zone. Through the geochemical analysis of PGE（ platinum group element）,Rb-Sr isotope and Sm-Nd isotope,the genesis of Dihu Cu-polymetallic deposit is studied. The study results show that：（1）the source of metallogenic material is characterized by multiple origin,the sources of metals are related to the magmatic activity and the regional basic magmatic rocks,which show that the metallogenic material is derived from magma with low melting degree of upper mantle;（2）the metallogenic material of Cu,Pb and Zn are derived from earth＇s crust,and they are closely related to the regional hidden granite,which show that part of the metallogenic maerial are derived from granite;（3） the isochron Rb-Sr isotope age and Sm-Nd isotope age of the regional altered rock deposit are（ 691. 2 ± 17. 9） Ma and（ 662. 3 ± 6. 6） Ma,which are quite different with the metallogenic age of the regional quartz vein type gold deposits,therefore,the metallogenic age of regional altered rock deposit is quite different with the one（ about 400 Ma） of regional quartz vein type deposit. The above study results further indicated that Dihu Cu-polymetallic deposit is formed in Wuling-Xufeng Period,besides that,its metallogenic activity is closely related to regional hidden rock mass.
作者
申娴达
王琼
息朝庄
李艳桃
Shen XiANDa;Wang Qiong;Xi Chaozhuang;Li Yantao(No.7 General Team,Guizhou Geological Exploration Bureau of Non-ferrous Metals and Nuclear Industry;Geological Survey Institute of Nuclear Resources,Guizhou Geological Exploration Bureau of Non-ferrous Metals and Nuclear Industry)
出处
《现代矿业》
CAS
2018年第5期124-130,共7页
Modern Mining
