Material Components and Occurrence States of Gold and Silver in the Xiyu–Tongyu Gold Deposit, Xiaoqinling, Shaanxi Province
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摘要:
在野外工作的基础上，笔者通过对小秦岭金矿田中西峪–桐峪金矿光薄片鉴定、化学成分分析、电子探针分析等，查明了该矿（带）共有11条含金构造带，主要赋存于太华群大月坪组和于洞沟组，矿床赋矿岩性为黄铁矿–多金属硫化物石英脉、多金属硫化物铁白云石石英脉和蚀变岩，矿石构造主要为团块状、浸染状、脉状、网脉状、星散（星点状）状、条带状构造。载金矿物主要为黄铁矿，次为黄铜矿、方铅矿和磁黄铁矿，脉石矿物主要为石英，其次为绢云母。金矿物以独立矿物形式存在，以粒间–裂隙金为主，粒度大多为0.16～0.32 mm，矿石的结构构造有利于矿物的解离。本区金矿成矿作用主要为热液成矿期，可分为金–黄铁矿–石英阶段、金–黄铁矿–多金属硫化物–石英阶段和黄铁矿–磁黄铁矿–碳酸盐阶段。
Abstract:The Xiyu–Tongyu gold deposit locates in the north of the Xiaoqinling gold field. Based on the geological field work, through the identification of thin sections, chemical composition and electron probe analysis, it is found that there are 11 gold–bearing structural zones in the deposit, which occur mainly in the Dayueping and Yudonggou Formations of the Taihua Group. The ore–hosting lithology of the deposit is pyrite polymetallic sulfide quartz vein, polymetallic sulfide ferrite quartz vein and altered rock. The ore structure is mainly massive, disseminated, veined, net veined, scattered (starpoint) and banded. The main gold–bearing minerals are pyrite, followed by chalcopyrite, galena and pyrrhotite. The main gangue minerals are quartz, followed by sericite. Gold minerals exist in the form of independent minerals, mainly intergranular and fissure gold, with the particle size concentrated in 0.16～0.32 mm. The structure of the ore is conducive to mineral dissociation. Gold mineralization in this area mainly belongs to hydrothermal mineralization stage, which can be divided into gold–pyrite–quartz stage, gold–pyrite–polymetallic sulfide–quartz stage and pyrite–pyrrhotite–carbonate stage.
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Key words:
- material component /
- gold occurrence state /
- Xiyu–Tongyu gold deposit /
- Xiaoqinling /
- Shaanxi
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表 1 勘探区内含金构造带特征表
Table 1. Characteristic of gold–bearing structural belt in exploration area
编号 产状（°） 规模（m） 岩石组成及蚀变 矿化特征 含金性 倾向 倾角 长 厚 Q61 180～220 26～56 1100 0.13～2.09 由绢云石英片岩、片理化辉绿岩、蚀变岩、碎裂岩及石英脉组成，具绢英岩化、绿泥石化蚀变，局部碳酸盐化 黄铁矿为主，方铅矿、黄铜矿、闪锌矿次之 圈出3条矿体，平均品位4.85 g/t Q1683 168～210 32～47 475 0.14～1.55 由构造片岩、蚀变岩、构造角砾岩及石英脉组成，具绢英岩化、绿泥石化、碳酸盐化蚀变 黄铁矿为主，次为方铅矿、黄铜矿化 圈出1条矿体，平均品位3.98 g/t Q1588 165～218 32～63 560 0.04～2.31 由糜棱岩、千糜岩、绢云石英片岩、片理化辉绿岩、石英脉组成，具绿泥石化、绿帘石化、绢云母化、硅化、碳酸盐化蚀变 黄铁矿化、方铅矿化 地表未见出露，为一隐伏状含金构造带；圈出1条矿体，平均品位为5.00 g/t Q1511 173～205 42～56 200 0.28～1.41 主要由绢云石英片岩、石英脉组成，局部见片理化辉绿岩，具绿泥石、绢云母、硅化等蚀变 黄铁矿化、方铅矿化，偶见黄铜矿化 地表未见出露，为隐伏状。圈出1条矿体，平均品位为5.58 g/t Q530 185～190 63～66 392 平均1.30 由绿泥绢云石英片岩及石英脉组成，具弱的绢云母、绿泥石化、绿帘石化蚀变 单一黄铁矿化 地表小于1 g/t，深部个别大于1 g/t，最高为2.3 g/t Q47 200 52 1100 平均1.15 由石英脉和绿泥石英片岩组成，具绢云母、绿泥石化蚀变 主为黄铁矿化，次为方铅矿化 圈出1条低品位矿体，平均品位为2.03 Q48 200 45 558 平均1.42 由绢云石英片岩夹石英脉或石英细脉组成，具绢云母、绿泥石化蚀变 星点状多金属硫化物，局部镜铁矿化 多小于1 g/t，个别样品大于1 g/t，最高2.64 g/t Q3015 210 48 595 平均1.31 由绿泥绢云石英片岩石英脉或石英细脉组成，具绢云母、绿泥石蚀变 细小的星点状多金属硫化物 多小于1 g/t，个别大于1 g/t Q44 210 55 493 平均0.95 由绿泥绢云石英片岩石英脉或石英细脉组成，具绢云母、绿泥石蚀变 星点状多金属硫化物 均小于1 g/t，最高品位为0.29 g/t Q19 180～201 28～41 270 0.10～1.21 由构造片岩和石英脉组成，具碎裂岩化，绢云母化蚀变 星点状黄铁矿化 均小于1 g/t Q531 160～185 35～48 1400 0.10～3.00 绿泥绢云石英片岩夹石英脉组成，具绢云母、绿泥石蚀变 黄铁矿化主，次为方铅矿、闪锌矿 圈出2条工业体 
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表 2 西峪–桐峪金矿矿石化学全分析统计表
Table 2. Ore chemistry analysis results of the Xiyu–Tongyu gold deposit
样品编号 QH1 QH2 QH3 QH4 QH5 QH6 样品位置 Q61 Q61 Q61 Q1588 Q1683 Q1511 矿石类型 石英脉 蚀变岩 蚀变岩 石英脉 石英脉 石英脉 Au 18.7 12 21.5 16.3 6.09 13.4 Ag 8.7 8.5 10.3 6.25 5.6 6.3 As 15.4 19.6 33.9 10.2 10.6 10.9 Cu 0.17 0.18 0.2 0.13 0.12 0.11 Pb 0.54 0.65 0.68 0.44 0.52 0.31 S 3.12 3.31 3.61 2.21 2.21 2.02 Zn 0.012 0.017 0.033 0.01 0.012 0.01 TFe 5.79 6.16 6.05 4.49 4.53 3.85 SiO2 86.85 86.14 85.68 89.17 89.39 90.1 Al2O3 1.67 1.67 1.58 1.51 1.57 1.6 CaO 0.69 0.73 0.95 0.62 0.59 0.66 Cr2O3 0.013 0.016 ＜0.010 ＜0.010 ＜0.010 ＜0.010 K2O 0.52 0.5 0.49 0.49 0.44 0.44 MgO 0.22 0.27 0.34 0.17 0.15 0.21 MnO 0.054 0.059 0.058 0.049 0.047 0.041 Na2O 0.23 0.25 0.26 0.26 0.23 0.31 P2O5 0.032 0.03 0.034 0.035 0.04 0.042 TiO2 0.053 0.054 0.052 0.057 0.059 0.056 灼失 1.92 2.34 1.87 1.44 1.5 1.48 注：样品由中陕核工业集团分析测试有限公司测试，含量单位Au、Ag、As为g/t，其余为%。
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表 3 主要金属矿物成分统计表
Table 3. Main metallic mineral composition
样品编号 矿物种属 Fe Cu Pb Zn S Au Ag As Sb Bi Cd TY-06-6 黄铁矿 45.46 0 0 0 52.79 0.49 0.26 0.18 0.17 0.65 0 TY-17-1 黄铁矿 45.87 0 0 0 53 0.29 0.15 0.15 0.13 0.43 0 TY-06-6 黄铜矿 30.56 32.68 0 0 35.37 0.32 0.2 0.12 0.2 0.55 0 TY-32-9 黄铜矿 30.47 32.89 0 0 35.26 0.31 0.16 0.21 0.2 0.5 0 TY-13-1 方铅矿 0 0 86.44 0 12.46 0.4 0.6 0.1 0 0 0 TY-32-9 闪锌矿 7.91 0 0 56.09 33.83 0 0.16 0.09 0.12 0.98 0.82 TY-25-1 闪锌矿 1.9 0 0 61.72 33.03 0 0.13 0.16 0.22 1.38 1.46 TY-06-8 磁黄铁矿 59.84 0 0 0 39.71 0 0.17 0 0.18 0.09 0 TY-32-1f 磁黄铁矿 59.35 0 0 0 39.43 0.42 0 0.19 0 0.6 0 B48 自然铋 0 0 0 0 0 0 0.1 0 0 99.9 0 TY-06-2 辉铅铋矿 0 0 32.44 0 16.07 0 0 0 0 51.49 0 注：样品由中陕核工业集团分析测试有限公司测试，含量单位为%。
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表 4 金矿物化学成分能谱分析结果表（%）
Table 4. Chemical composition of gold minerals (%)
样号 矿物 Au Ag As Bi TY-06-2 自然金 89.70 10.30 0.00 0.00 TY-06-8 自然金 88.83 11.17 0.00 0.00 TY21-1 自然金 87.28 12.72 0.00 0.00 TY07-4 自然金 90.68 9.32 0.00 0.00 TY-32-9 自然金 89.50 10.50 0.00 0.00 TY-11-1 自然金 95.36 4.64 0.00 0.00 TY-17-1 自然金 95.64 4.36 0.00 0.00 注：样品由中陕核工业集团分析测试有限公司测试，含量单位为%。
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