山东金青顶金矿床和七宝山金矿床的流体包裹体REE组成  

REE Composition of Fluid Inclusions in Jinqingding and Qibaoshan Gold Deposits, Jiaodong Area

作　　者：陈绪松[1] 徐九华[1] 刘建明[2] 谢玉玲[1] 朱和平[2] 李永兵[1] 

机构地区：[1]北京科技大学,北京100083 [2]中国科学院地质与地球物理研究所,北京100101

出　　处：《矿床地质》2002年第4期387-392,共6页Mineral Deposits

基　　金：国家自然科学基金 (4 9972 0 3 1);中国科学院知识创新工程项目 (KZCX1_0 7)的资助

摘　　要：文章运用电感耦合等离子体质谱 (ICP_MS)方法 ,研究了金青顶金矿床和七宝山金矿床的脉石英中流体包裹体REE组成特征。结果表明流体包裹体的REE均为LREE富集型 ,并显示Eu正异常。成矿流体REE配分模式和REE参数特征表明它们具有相同的来源。与金矿有关的成矿母岩 ,即昆嵛山花岗岩和七宝山次火山岩的REE特征也极为相似 ,反映成矿流体的REE组成都有从成岩向成矿过程演化继承的关系。矿床流体包裹体REE组成的相似特征及矿床碳氧同位素等特点表明 。The Jinqingding gold deposit and the Qibaoshan gold deposit are known as a typical vein gold deposit and a sub_volcanic gold deposit, respectively, in Jiaodong area. Fluid inclusions in quartz of both gold deposits can be classified into two species: aqueous inclusions and CO 2_rich inclusions. Daughter minerals in the Qibaoshan gold deposit are Fe_, Mg_ and Mn_bearing carbonate, as shown by SEM/EDS. REE and trace elements in fluids in quartz are determined by ICP_MS. The data show that the fluids are enriched in LREE with a positive Eu anomaly. Chondrite_normalizied REE patterns show that they have the same origin (crust_mantle source) and their REE parameter characteristics are quite similar to those of their mother rocks, indicating that REE in fluids assumes the evolutive relations between mother rock and ore fluids. The abnormal trace element compositions of ore_forming fluids are very similar in the Jinqinding and in the Qibaoshan. The δ 13 C PDB values range from _6‰ to 0‰, and the δ 18 O SMOW values vary from 7‰ to 13‰, suggesting that the gold deposits in Jiaodong area were probably formed by the same Mesozoic tectonic movement and deep thermal event in eastern North China region.

关 键 词：地球化学 矿床成因 流体包裹体 稀土元素 ICP-MS 金矿床 山东 电感耦合等离子体质谱法 

分 类 号：P618.51[天文地球—矿床学] P595[天文地球—地质学]