摘要
本文从地质地球化学角度对峪耳崖金矿床进行了详细研究,认为该金矿是典型的岩浆热浪型脉状金矿床,金矿与峪耳崖花岗岩(即矿床的主要围岩)为同源岩浆作用的产物,而其源岩物质可能来自深部地壳。黄铁矿中Co/Ni比为1.58,石英中La/Yb比为2.95,δ^(34)S_∑为+2.6‰,δ^(13)O水为+7.03‰,δD为-88.4‰,δ^(13)C为-4.18‰,成矿温度为305～343℃,pH为6.2～6.8,石英包裹体成分中Cl^->F^-、Na^+>K^+,金可能是以Na[AuCl_2],Na[Aucl_4]或Na[AuS]等络合物形式迁移。
The Yuerya gold deposit is located in Kuanchen country, Hebei province. The main country rocks of it are the Yuerya granite. According to the spatial distributions and forms of orebodies,it could be devided into three ore belts:the south,middle, and north.Major ore mineral is pyrite,and pyrrhotite,chalopyrite,sphalerite,galena, and molybdenite etc.are subordinate. The mineralized type is referred to gold-bearing sulfide-quartz vein.Based on the study of geochemistry of the gold deposit,the author holds that it belongs a typical magmatic-hydrothermal ores,and are possibly derived from 'the deep crust. The Co/Ni ratio of pyrite is 1.58;La/Yb ratio of quartz,2.95;total sulfur isotope composition of hydrothermal solution, +2.6‰δOw . + 7.03‰;δD, -88.4‰;δ13C-4.18‰;ore-forming temperature, 305-343℃;nd pH, 6.2 -6.8.Cl-is more than F-,and Na+more than K+ in quartz inclusions,indicating that gold were probably transported as Na[AuCl2],Na[AuCl4],Na[AuS]in the hydrothermal solution.
关键词
金矿
地球化学
微量元素
包裹体
gold deposit,trace elements, stable isotope, inclusion, geochemistry
