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矿床地质  2002 

胶东金矿形成期间地幔流体参与成矿过程的碳氧氢同位素证据

Keywords: 金矿床,胶东,地幔流体,碳氧氢同位素

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Abstract:

胶东地区发育有两种类型的金矿床:以玲珑、焦家、三山岛、乳山为代表的石英脉型_破碎蚀变岩型和以大庄子、蓬家夼为代表的胶莱盆地北缘滑脱破碎带内的角砾岩型金矿。本文选择了两种类型中的玲珑、三山岛和大庄子金矿床进行碳氧氢同位素测定。初步认为两类金矿属于同一成矿系统,它们形成于120Ma左右的华北克拉通岩石圈减薄和软流圈上涌期间,岩浆流体和地幔脱气与胶东世界级金矿的形成密切相关。在石英脉型_破碎蚀变岩型矿石中可见深刻的地幔流体和岩浆流体的“烙印”。形成于滑脱破碎带中的角砾岩金矿流体与中生代大气降水和海相碳酸盐岩发生了强烈的交换作用。

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