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J4 ›› 2012, Vol. 20 ›› Issue (4): 26-32.
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JIN Nianxian,WANG Junting,SUN Zhifu,LI Wen,LIAO Changxi,SUO Jiancheng,LIU Xiangpeng
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Gold mines in the northern part of Laizhou City are mainly controlled by two major fractures,the Sanshandao and Jiaojia fault zones.The mylonite and SL tectonite in these two fault zones,and the macro and micro characteristics,such as quartz ribbon(L lineation),rotational porphyroclast and S foliation,all confirm that they belong to the brittle-ductile shear zone.Studies have shown that the ductile shearing occurred after the intrusion of the fractional crystallization dykes from the Guojialing magma,and the time was speculated about in the 126~122 Ma.The mylonite and SL tectonite correspondingly formed into disseminated and veined pyrite phyllic ore,under the filling and metasomatism of gold-bearing hydrothermal of the main mineralization.Ductile shearing of these two fault zones went a great depth,and was speculated to be intersected at the depth of 5 500 m. The composite parts between the Guojialing granite and the NE brittle-ductile shear zone,the eastern secondary structure of Yishu fault zone,formed in the Early Cretaceous,is the best position for the formation of the world-class alteration rock-type gold deposits.
Key words: NE brittle-ductile shear zone, Mylonite, SL tectonite, Alteration rock-type gold deposit, Northwest Jiaodong
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JIN Nianxian,WANG Junting,SUN Zhifu,LI Wen,LIAO Changxi,SUO Jiancheng,LIU Xiangp. Jiaojia-style Gold Deposit and its Prospecting Direction Controlled by Ductile Shear Zone[J].J4, 2012, 20(4): 26-32.
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http://www.goldsci.ac.cn/EN/Y2012/V20/I4/26
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