豫西地区石窑沟钼矿床黄铁矿标型特征研究

Typomorphic Characteristics of Pyrite in Shiyaogou Molybdenum Deposit in Western Henan

黄铁矿是豫西地区石窑沟钼矿床与矿化关系最为密切的矿物之一,详细研究了石窑沟钼矿床中黄铁矿的产状、形态、物性和化学成分特征,提取了黄铁矿中重要的成因和找矿信息,不仅为石窑沟钼矿床的成因研究提供了可信的矿物学依据,而且对矿区深部的矿化远景进行了初步预测。形态研究主要是通过偏光显微镜和背散射电子图像的观察,并通过电子探针分析确定了黄铁矿中包裹体类型。通过黄铁矿的热电效应测试了解其特征。化学成分测定采用溶液-等离子质谱法(ICP-MS)。应用找矿矿物学的方法研究石窑沟钼矿床中黄铁矿的成分及特征比值(Co/Ni、Se/Te),并对黄铁矿的热电系数进行统计分析,认为豫西地区石窑沟钼矿床的矿化与中温岩浆热液作用有关,并且初步认为在栗树沟的深部具有较好的成矿远景。

Pyrite is one of the important minerals which are closely related to mineralization of Shiyao-gou molybdenum deposit in western Henan province.We studied the occurrences,shapes,physical prop-erties and chemical compositions of pyrites in the deposit.The results provided important information on the mineralogical genesis of pyrites and mineralization perspective in depth of the Shiyaogou Mo deposit. With combined observations under microscope and studies by using Electron-probe Microanalysis (EP-MA),mineral inclusions in pyrites were identified,and the generation of pyrite was divided.Characteris-tics of physical properties of pyrite were tested by their pyroelectric effects. We derived the pyrite forma-tion in middle temperature environment. Chemical compositions were determined by using Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Based on the prospecting mineralogy studied of pyrite, including their Co/Ni and Se/Te ratios and statistical analysis of their thermoelectric coefficients,we con-cluded that the mineralization of the Shiyaogou Mo deposit in Henan province would be related to middle temperature magmatic hydrothermal fluids and predicted that there would be good prospecting assessment in depth of the Lishugou area.