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40Ar/39Ar and Rb-Sr isochron dating of the gold deposits on northern margin of the Jiaolai Basin,Shandong,China

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【作者】 张连昌； 沈远超； 刘铁兵； 曾庆栋； 李光明； 李厚民；

【Author】 ZHANG Lianchang,SHEN Yuanchao,LIU Tiebing ZENG Qingdong,LI Guangming & LI Houmin

【机构】 Institute of Geology and Geophysics,Chinese Academy of Sciences；

【摘要】 <正>The Pengjiakuang,Dazhuangzi and Fayunkuang gold deposits,located on the northern margin of the Mesozoic Jiaolai Basin,east of Shandong Province,are controlled by a low-angle normal fault.Gold ores are typically brecciated,veinlet and disseminated.The Ar-Ar and Rb-Sr isochron dating methods were adopted to date ores and lamprophyre dike.The results indicate that the age of the Pengjiakuang gold deposit is 117.33—118.42 Ma,that of the Dazhuangzi gold deposit is 117.39 Ma,and that of the Fayunkuang gold deposit is(128.49±7.2) Ma.The consistency in metallogenic age between the gold deposits on the margin of the Jiaolai Basin and the gold deposits(115—126 Ma) of the northern uplift area suggests that both were formed in the same metallogenic period.That is to say,the large-scale metallogeny of the Jiaodong region took place in late-Yanshannian((120+10) Ma).

【Abstract】 The Pengjiakuang,Dazhuangzi and Fayunkuang gold deposits,located on the northern margin of the Mesozoic Jiaolai Basin,east of Shandong Province,are controlled by a low-angle normal fault.Gold ores are typically brecciated,veinlet and disseminated.The Ar-Ar and Rb-Sr isochron dating methods were adopted to date ores and lamprophyre dike.The results indicate that the age of the Pengjiakuang gold deposit is 117.33—118.42 Ma,that of the Dazhuangzi gold deposit is 117.39 Ma,and that of the Fayunkuang gold deposit is(128.49±7.2) Ma.The consistency in metallogenic age between the gold deposits on the margin of the Jiaolai Basin and the gold deposits(115—126 Ma) of the northern uplift area suggests that both were formed in the same metallogenic period.That is to say,the large-scale metallogeny of the Jiaodong region took place in late-Yanshannian((120+10) Ma).

【Key words】 Ar-Ar age； Rb-Sr isochron； gold metallogenic time； northern margin of the Jiaolai Basin；
【基金】 supported by the Chinese Academy of Sciences(Grant Nos. KZCX1-Y-03 and KZ951-A1-404)
  • 【会议录名称】 中国科学院地质与地球物理研究所二○○三学术论文汇编·第五卷(矿产资源与水资源)
  • 【会议名称】中国科学院地质与地球物理研究所2003学术年会
  • 【会议时间】2003-12-01
  • 【会议地点】中国北京
  • 【分类号】P618.51;P597.3
  • 【主办单位】中国科学院地质与地球物理研究所(Institute of Geology and Geophysics Chinese Academy of Sciences)
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