陕西八卦庙金矿石英标型特征研究  

Study on typomorphic characteristics of the quartz from the Baguamiao gold deposit,Shaanxi province

作　　者：王学明[1,2] 汪东波[1] 邵世才[1] 冯建忠[1] 

机构地区：[1]北京矿产地质研究所 [2]中国地质调查局发展研究中心,北京100083

出　　处：《黄金地质》2001年第2期1-5,共5页Gold Geology

基　　金：国家攻关基金资助项目 (96 914 0 1 0 4) ;国家有色工业局地勘总局基金资助项目 (98 D 1)

摘　　要：八卦庙金矿的石英可分为 3期 ,即早期近EW向顺层脉、中期NE向节理脉和晚期缓倾斜切脉。X光衍射分析表明 ,石英的晶胞参数、晶胞体积及有关衍射强度比值 (I10 1/I10 0 )和石英的Au含量相关关系不明显 ,但总体上有关晶胞参数值较一般标准石英的要大 ;不同标高石英的晶胞参数表现为脉动式的变化。另外 ,从成矿早期到晚期 ,c0 /a0 和I10 1/I10 0 值随温度降低而有所降低。石英薄片红外光谱研究结果表明 ,石英包裹体中H2 O的相对光密度D1/D0 值除一个样品较小 (0 32 )外 ,其余均在 1 2 3～ 4 77,平均 2 3143。总体上Au含量较高的石英其H2 O和CO2 的相对光密度D1/D0 和D2 /D0 值也具相对较高的趋势 ;并且D1/D0 和D2 /D0 具有密切的正相关关系 ,相关系数为 0 858,这种同步增长说明H2 O和CO2 气液丰富有利于Au的矿化富集。标高相差 150m样品的H2 O和CO2 的相对光密度值未发生显著变化且均显示含Au性较好的信息 。The quartz of the Baguamiao gold deposit was formed in three stages: early stage nearly EW strike quartz veins along strata,middle stage along NE jointing veins and later stage veins lightly inclined and clinodissected with strata. X Ray analysis on the quartz show: crystal lattice constant,volume and I 101 / I 100 of the quartz and its gold content is unclear in correlation.However, in general,the crystal lattice constants are bigger than ones of ordinal quartz, and varied in pulsation along with different located highth. From early to later stage, c 0/ a 0 and I 101 / I 100 gradually decreased with temperature. Studies on infrared spectra of the quartz thin section show: relative optical densities D 1/ D 0 of H 2O in quartz range from 1 23 to 4 77 in samples, mean 2 314 3 except for one sample(0 32). In general,there is a tendency that gold contents increased with relative optical densities D 1/ D 0 and D 2/ D 0 rising of H 2O and CO 2 in quartz; Besides, D 1/ D 0 and D 2/ D 0 is closely positive correlative and correlative index is 0 858, above condition indicates that rich H 2O and CO 2 is benefit to golds enrichment. From above,to the weak change in D 1/ D 0 and D 2/ D 0 of H 2O and CO 2 within 150 m, its suggested that there is good prospect in the deep location of the Baguamiao gold deposit.

关 键 词：金矿床 石英 晶胞参数 红外光谱 陕西 矿床地质 结构标型 

分 类 号：P618.51[天文地球—矿床学] P578.494[天文地球—地质学]