冀东金厂峪金矿区钠长岩脉及青山口花岗岩体SHRIMP锆石U-Pb定年及其意义  

ZIRCON SHRIMP U-Pb DATING OF ALBITE DYKE IN JINCHANGYU GOLD MINE, JIDONG AREA, HEBEI, CHINA

作　　者：罗镇宽[1] 关康[1] 裘有守[1] 苗来成[2] Y.M.Qiu N.J.McNaughton D.I.Groves 

机构地区：[1]天津地质研究院,天津300061 [2]中国科学院地质和地球物理研究所 [3]Centre for Strategic Mineral Deposits,Department of Geology amd Geophysics,the University of Western Australia

出　　处：《地质找矿论丛》2001年第4期226-231,共6页Contributions to Geology and Mineral Resources Research

基　　金：中国-澳大利亚经济技术合作研究基金项目资助;国家攀登预选项目 ( 95 -预 -2 5 )资助

摘　　要：金厂峪金矿床是冀东最大的金矿床 ,具有早期复脉型和晚期石英大脉型两种矿石类型。矿区产有多期钠长岩脉 ,且与含金矿脉有密切的时间和空间关系。青山口花岗岩体位于矿区西约 2～ 3km,有研究者认为金矿床成因上与花岗岩体有关。应用先进的 SHRIMP测年技术 ,测得肉红色钠长岩脉的锆石 w (2 0 7Pb) / w (2 0 6Pb)年龄为 (185 8± 8) Ma,青山口花岗岩体锆石 w(2 0 6Pb) / w(2 3 8U )年龄为 (199± 2 ) Ma。金厂峪金矿床的的复脉型矿化早于肉红色钠长岩脉 ,故其矿化的时代应在晚元古代。青山口岩体的年龄和区域上与辉钼矿化有关的花岗岩年龄一致 ,均为燕山早期。推测金厂峪金矿床晚期石英大脉型矿化中的辉钼矿化可能与青山口花岗岩体有关 。Jinchangyu gold deposit is the largest one in Jideong area consisting of the early composite vein type ore and the late quartz dyke type ore. Albite dykes of several stages occur in the mining area and show close spatial and temporal relation to the gold ore. Qingshankou granitic body is about 2~3 km in the west of the mining area. Some researchers considered the granite to be genetically related to the gold deposit. Zircon SHRIMP dating of pink albite dyke in the mining area is 1 858±8 Ma ( 207Pb/ 206Pb) and the dating of Qingshankou granite 199±2 Ma( 206Pb/ 238U). Because the composite vein type ore of Jinchangyu gold deposit pre-dates the pink dyke the gold mineralization should occur in late Proterozoic era. The age of Qinoshankou granite and that of regional molybdenite mineralization belongs to early Yanshanian period. It is inferred that molybdenite mineralization in late quartz dyke is related to Qingshankou granite and the quartz dyke type Au mineralization occur in Yanshanian period of Mesozoic era.

关 键 词：SHRIMP测年 花岗岩 金矿床 河北 锆石 中生代 矿化时代 

分 类 号：P618.51[天文地球—矿床学] P588.121[天文地球—地质学]