40Ar/39Ar and Rb-Sr isochron dating of the gold deposits on northern margin of the Jiaolai Basin, Shandong, China |
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Authors: | Lianchang Zhang Yuanchao Shen Tiebing Liu Qingdong Zeng Guangming Li and Houmin Li |
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Institution: | (1) Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029 Beijing, China |
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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). |
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Keywords: | Ar-Ar age Rb-Sr isochron gold metallogenic time northern margin of the Jiaolai Basin |
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