河北武安玉泉岭铁矿床流体包裹体地球化学特征

Geochemical Characteristics of Fluid Inclusions from the Yuquanling Iron Deposit in Wu'an,Hebei Province

本文在系统总结前人关于玉泉岭铁矿床地质特征及矿床特征的基础上,开展了石榴石和方解石流体包裹体均一法测温,并对磁铁矿、黄铁矿和方解石样品进行了气液相成分测试。结果表明,流体包裹体气相的主要成分为H2O和CO2,液相成分以K+、Ca2+、Na+、Mg2+、Cl-、F-、SO2-4为主。流体包裹体均一温度变化于100～560℃,主要集中于140～540℃,盐度变化于1.91%～21.19%,主要集中于4.50%～18.00%。综合以上流体包裹体特征,表明成矿流体可能主要来源于岩浆水,部分来自大气降水。

This study carries out measurements of homogenization temperature for fluid inclusions in garnet and calcite from the Yuquanling iron deposit in Hebei Province,and makes an analysis on gas and liquid compositions of magnetite,pyrite and calcite.The results show that the gas components of fluid inclusions are mainly H 2 O and CO 2,and the liquid components of fluid inclusions are dominated by K+,Ca2 +,Na+,Mg2 +,Cl-,F-and SO2 4.The homogenization temperature of the fluid inclusions varies from 100 to 560℃,mostly ranging from 140 to 540℃.The salinity of fluids varies from 1.91% to 21.19%,mostly from 4.50% to 18.00%.It is suggested that the ore-forming fluid was mainly derived from magma water,and part stemmed from atmospheric precipitation.