胶西北地区北截金矿闪长玢岩锆石SHRIMP年龄及其地质意义
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Zircon SHRIMP Age of Diorite porphyrite in Beijie Gold Deposit from the Northwest Jiaodong Area and Its Geological Implications
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    摘要:

    山东省招远市北截金矿是胶西北地区发现较早的金矿之一,主要赋存于严格受NEE向断裂控制的黄铁绢英岩化蚀变带内,是典型的破碎带蚀变岩型金矿。本文通过对矿区内切穿矿体的闪长玢岩、郭家岭序列下属北截岩体的地质背景和SHRIMP锆石U Pb年代学研究,得出闪长玢岩形成年龄为117±2Ma,北截岩体形成年龄为129±1Ma,限定北截金矿成矿年龄在117~129Ma之间,属早白垩世。锆石样品中测得Ar3、Z、J3等多个期次的继承锆石年龄,表明北截岩体和闪长玢岩形成过程具有多重继承演化性。根据同源岩浆的成岩成矿时间差及岩体与金矿的空间位置,判断郭家岭序列与金矿关系更为密切。讨论了胶东金矿的成矿期次和构造环境,认为其形成于俯冲造山带的弧后伸展环境,其形成与演化受中生代以来中国东部岩石圈大规模减薄、地幔上涌或陆缘裂谷的影响,最终成因可能与地幔柱有关。

    Abstract:

    The Beijie gold deposit in Zhaoyuan city is one of the earliest discovered gold deposit in the northwest Jiaodong area. It is a typical altered tectonite type gold deposit which lies in beresitization alteration zone strictly controlled by an NEE fault. This article studies geological background and zircon SHRIMP geochronology of diorite porphyrite cutting through orebody and Beijie intrusion from Guojialing sequences. Dating result of zircons from diorite porphyrite is 117±2Ma and Beijie intrusion is 129±1Ma, suggesting that the Beijie gold deposit was formed in early Cretaceous with an age of 117~129Ma. Multiple stages of inherited zircon age of Ar3,Z,J3 gained from zircons in Beijie intrusion and diorite porphyrite imply that the process of rock forming was very complicated and inherited. Guojialing sequence is 5~10Ma earlier than gold deposits in the Jiaodong area, and it is more closer to gold deposits in space distribution, suggesting that it is much more closer to a magma source of ore forming fluid in the Jiaodong area. Ore forming stage and tectonic environment of Jiaodong gold deposits are also discussed. It is conclucled that the Jiaodong gold concentration area was formed in an environment of back arc extending. Its formation and evolution were controlled by large scale lithospheric thinning, mantle upwelling, and continental margin rift in east China in Mesozoic. It was very probably related to a mantle plume.

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耿科,王瑞江,李洪奎,单伟,李大鹏.2015.胶西北地区北截金矿闪长玢岩锆石SHRIMP年龄及其地质意义[J].地质学报,89(6):1099-1107.
GENG Ke, WANG Ruijiang, LI Hongkui, SHAN Wei, LI Dapeng.2015. Zircon SHRIMP Age of Diorite porphyrite in Beijie Gold Deposit from the Northwest Jiaodong Area and Its Geological Implications[J]. Acta Geologica Sinica,89(6):1099-1107.

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  • 收稿日期:2015-02-10
  • 最后修改日期:2015-05-05
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  • 在线发布日期: 2015-06-18
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