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    小秦岭西峪–桐峪金矿矿床物质组分及金赋存状态研究

    范东旭, 夏元鹏

    范东旭, 夏元鹏. 小秦岭西峪–桐峪金矿矿床物质组分及金赋存状态研究[J]. 西北地质, 2023, 56(1): 254-265. DOI: 10.12401/j.nwg.2022038
    引用本文: 范东旭, 夏元鹏. 小秦岭西峪–桐峪金矿矿床物质组分及金赋存状态研究[J]. 西北地质, 2023, 56(1): 254-265. DOI: 10.12401/j.nwg.2022038
    FAN Dongxu, XIA Yuanpeng. Material Components and Occurrence States of Gold and Silver in the Xiyu–Tongyu Gold Deposit, Xiaoqinling, Shaanxi Province[J]. Northwestern Geology, 2023, 56(1): 254-265. DOI: 10.12401/j.nwg.2022038
    Citation: FAN Dongxu, XIA Yuanpeng. Material Components and Occurrence States of Gold and Silver in the Xiyu–Tongyu Gold Deposit, Xiaoqinling, Shaanxi Province[J]. Northwestern Geology, 2023, 56(1): 254-265. DOI: 10.12401/j.nwg.2022038

    小秦岭西峪–桐峪金矿矿床物质组分及金赋存状态研究

    详细信息
      作者简介:

      范东旭(1997−),女,硕士研究生,主要从事矿床学和矿产勘查研究工作。E-mail:fdx312@126.com

      通讯作者:

      夏元鹏(1966−),男,高级工程师,主要从事地质矿床勘察与开发。E-mail:962127776@qq.com

    • 中图分类号: P61

    Material Components and Occurrence States of Gold and Silver in the Xiyu–Tongyu Gold Deposit, Xiaoqinling, Shaanxi Province

    • 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.

    • 图  1   小秦岭地区金矿床分布及地质简图(底图据聂凤军等,2001

      1. 第四系沉积物;2. 中元古界碎屑岩和碳酸盐岩;3. 太古宙太华群变质岩(Arthd.大月坪组; Arthb. 板石山组;Arthdg. 洞沟组;Arths. 三关庙组;Arthq. 秦仓沟组); 4. 早白垩世花岗岩; 5. 中元古代花岗岩; 6. 背斜;7. 断裂带; 8. 金矿床; 9. 省界

      Figure  1.   Geological sketch map of gold fields in the Xiaoqinling region

      图  2   西峪-桐峪金矿地质图

      1.太华群洞沟组;2.太华群板石山组;3.太华群大月坪组;4.辉绿岩;5.花岗岩;6.金矿脉;7.地质界线;8.勘探矿权范围

      Figure  2.   Geological map of Xiyu–Tongyu gold deposit

      图  3   西峪–桐峪金矿矿石标本及显微照片

      a.金属矿物硫化物石英脉型矿石标本,硫化物呈团块状、浸染状分布(1.金属硫化物;2.石英);b.多金属硫化物铁白云石石英脉型矿石标本;c.蚀变岩型金矿石(绢英岩)显微特征( 1.石英;2.绢云母;3.金属矿物);d.二期石英脉独立分布于构造带内

      Figure  3.   Ore specimens and micrographs of the Xiyu–Tongyu gold deposit

      图  4   黄铁矿、黄铜矿、方铅矿等金属矿物显微照片

      a. 早期黄铁矿包裹于团块状磁黄铁矿中;b. 早期黄铁矿与方铅矿的交代关系, 方铅矿呈团块状分布,少量方铅矿呈线状分布于黄铁矿裂隙中,部分方铅矿呈乳滴状、蠕虫状等沿黄铁矿边部及裂隙;有的位于黄铁矿中心交代包裹于黄铁矿中,形成交代结构;c. 黄铁矿呈团块状分布,磁黄铁矿与黄铜矿分布于黄铁矿粒间、裂隙中;d. 黄铁矿裂隙中分布的黄铜矿、自然金等矿物;e. 自形–半自形粒状黄铁矿呈团块状分布,自然金呈线状、角粒状分布;f. 自然金呈针状分布于黄铁矿裂隙中;g. 方铅矿分布于早期黄铁矿周围及粒间,与黄铁矿呈规则–半规则连生;h. 黄铜矿与方铅矿呈细脉状分布于黄铁矿裂隙中;i. 方铅矿与自然铋、磁黄铁矿分布在一起,部分位于黄铁矿裂隙中;j. 方铅矿呈细脉状石英脉裂隙中,角粒状自然金位于方铅矿与石英粒间;k. 自然金呈角粒状与方铅矿连生位于黄铁矿粒间;l. 半自形–他形粒状浸染状黄铜矿与其他矿物连生关系

      Figure  4.   Micrographs of pyrite, chalcopyrite, galena and other metallic minerals

      图  5   黄铁矿、磁黄铁矿等金属矿物显微照片

      a.黄铜矿与辉铅铋矿连生关系;b. 黄铁矿裂隙中自然金呈角粒状位于黄铜矿粒间;c.黄铁矿裂隙中自然金呈角粒状位于黄铜矿粒间,闪锌矿与黄铜矿共生;d.角粒状自然金与黄铜矿、闪锌矿、磁黄铁矿细脉分布于黄铁矿裂隙中;e.自然金呈枝杈状位于磁黄铁矿与非金属矿物粒间呈角粒状分布于非金属矿物粒间;f. 辉铅铋矿及辉铅铋矿与自然铋的固溶体分布于石英脉裂隙中;g.自然金与辉铅铋矿及磁黄铁矿一起分布于黄铁矿裂隙中;h.碲铋矿分布于黄铁矿裂隙中、自然金呈角粒状包裹于黄铁矿中;i.自然金与方铅矿、非金属矿物的连生关系

      Figure  5.   Micrographs of pyrite, pyrrhotite and other metallic minerals

      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
      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
      下载: 导出CSV

      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QH1QH2QH3QH4QH5QH6
      样品位置Q61Q61Q61Q1588Q1683Q1511
      矿石类型石英脉蚀变岩蚀变岩石英脉石英脉石英脉
      Au18.71221.516.36.0913.4
      Ag8.78.510.36.255.66.3
      As15.419.633.910.210.610.9
      Cu0.170.180.20.130.120.11
      Pb0.540.650.680.440.520.31
      S3.123.313.612.212.212.02
      Zn0.0120.0170.0330.010.0120.01
      TFe5.796.166.054.494.533.85
      SiO286.8586.1485.6889.1789.3990.1
      Al2O31.671.671.581.511.571.6
      CaO0.690.730.950.620.590.66
      Cr2O30.0130.016<0.010<0.010<0.010<0.010
      K2O0.520.50.490.490.440.44
      MgO0.220.270.340.170.150.21
      MnO0.0540.0590.0580.0490.0470.041
      Na2O0.230.250.260.260.230.31
      P2O50.0320.030.0340.0350.040.042
      TiO20.0530.0540.0520.0570.0590.056
      灼失1.922.341.871.441.51.48
       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%。
      下载: 导出CSV

      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FeCuPbZnSAuAgAsSbBiCd
      TY-06-6黄铁矿45.4600052.790.490.260.180.170.650
      TY-17-1黄铁矿45.87000530.290.150.150.130.430
      TY-06-6黄铜矿30.5632.680035.370.320.20.120.20.550
      TY-32-9黄铜矿30.4732.890035.260.310.160.210.20.50
      TY-13-1方铅矿0086.44012.460.40.60.1000
      TY-32-9闪锌矿7.910056.0933.8300.160.090.120.980.82
      TY-25-1闪锌矿1.90061.7233.0300.130.160.221.381.46
      TY-06-8磁黄铁矿59.8400039.7100.1700.180.090
      TY-32-1f磁黄铁矿59.3500039.430.4200.1900.60
      B48自然铋0000000.10099.90
      TY-06-2辉铅铋矿0032.44016.07000051.490
       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%。
      下载: 导出CSV

      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AuAgAsBi
      TY-06-2自然金89.7010.300.000.00
      TY-06-8自然金88.8311.170.000.00
      TY21-1自然金87.2812.720.000.00
      TY07-4自然金90.689.320.000.00
      TY-32-9自然金89.5010.500.000.00
      TY-11-1自然金95.364.640.000.00
      TY-17-1自然金95.644.360.000.00
       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%。
      下载: 导出CSV
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    • 收稿日期:  2022-06-16
    • 修回日期:  2022-09-19
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