摘要
对不同研究者采用蚀变矿物Rb Sr、K Ar和Ar Ar法 ,流体包裹体Rb Sr等时线法 ,石英Ar Ar法和矿石矿物 (黄铁矿 )Rb Sr等时线法等多种同位素定年方法获得的胶东金矿集中区金矿成矿年龄数据进行了方法适用性研究和应用选择 ,筛选后的成矿年龄集中于 15 3 8～ 80 6Ma。综合考虑与金矿床有密切时空关系的花岗岩类侵入体及脉岩的K Ar、Ar Ar及U Pb (SHRIMP)年龄 ,确认胶东金矿集中区金矿主成矿期年龄为 (115± 10 )Ma ,金 银 多金属矿成矿期年龄为 (85± 5 )Ma ,分别为中生代早白垩世晚期 (K21)和晚白垩世早期 (K12 )。
Metallogenic ages of gold deposits in Jiaodong gold concentration zone range from 153.8 to 80.6 Ma after screening, which is obtained by domestic and abroad authors with various isotope dating methods, such as Rb-Sr, K-Ar and Ar-Ar method for altered minerals, Rb-Sr isochron dating for fluid inclusions, Ar-Ar for quartz and Rb-Sr isochron for ore-mineral et al. Combined with the K-Ar,Ar-Ar dating and SHRIMP zircon U-Pb method dating data of granitoid plutons and dyke rocks which closely related gold mineralization in temporal and spatial, the age of major ore-forming stage of gold deposits in Jiaodong gold concentration zone (105～125 Ma) is affirmed. The age of Au, Ag and polymetallic ore deposits is 90～80 Ma, that is later Lower Cretaceous (K 2 1) and early Upper Cretaceous (K 1 2) of Mesozoic.
出处
《黄金地质》
2002年第4期48-55,共8页
Gold Geology
