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矿床地质  2012 

浙江安吉铅锌多金属矿区细粒花岗岩的岩石化学、年代学及成矿意义探讨

Keywords: 地球化学,Pb-Zn多金属矿,细粒花岗岩,锆石U-Pb定年,成矿意义,浙江安吉

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Abstract:

文章在详细的野外地质调查、岩石学、岩石化学和锆石U-Pb定年结果基础上,对浙江安吉矿区细粒花岗岩的岩浆起源、侵位时代与成矿的关系及找矿指示意义等进行了较为深入的探讨。细粒花岗岩侵位时代晚于矿区的黑云母二长花岗岩、正长花岗岩和花岗闪长岩,侵位时代约在134Ma左右,为中国东部晚侏罗世—早白垩世岩石圈活化及大规模成岩成矿作用的产物。岩石化学研究结果表明,细粒花岗岩属高钾钙碱性-钾玄岩、过铝质岩石系列,轻稀土元素相对富集,重稀土元素相对亏损,富集大离子亲石元素Rb、Th、U、K、轻稀土元素和Pb,明显亏损高场强元素Nb、Ta、Ti和P,显示较高的分异程度。据根锆饱和温度,计算其母岩浆结晶温度约在834.6~870.6℃。结合矿区已知的矿化和蚀变与细粒花岗岩的空间关系、细粒花岗岩岩石化学特征以及细粒花岗岩与矿石铅同位素研究结果,笔者认为,安吉铅锌多金属矿区铅锌钼矿化与细粒花岗岩具有密切的成因联系,细粒花岗岩与寒武系灰岩接触部位控制了矽卡岩型铅锌矿化的产出,这一成果对该区的进一步找矿勘查具有重要的指导意义。

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