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    内蒙古乌日尼图钨钼矿床成矿流体特征及地质意义

    杨增海 王建平 刘家军 王守光 王清义 康书光

    杨增海, 王建平, 刘家军, 王守光, 王清义, 康书光, 2012. 内蒙古乌日尼图钨钼矿床成矿流体特征及地质意义. 地球科学, 37(6): 1268-1278. doi: 10.3799/dqkx.2012.135
    引用本文: 杨增海, 王建平, 刘家军, 王守光, 王清义, 康书光, 2012. 内蒙古乌日尼图钨钼矿床成矿流体特征及地质意义. 地球科学, 37(6): 1268-1278. doi: 10.3799/dqkx.2012.135
    YANG Zeng-hai, WANG Jian-ping, LIU Jia-jun, WANG Shou-guang, WANG Qing-yi, KANG Shu-guang, 2012. Characteristics and Its Geological Significance of Fluid Inclusions of the Wurinitu W-Mo Deposit in Inner Mongolia, China. Earth Science, 37(6): 1268-1278. doi: 10.3799/dqkx.2012.135
    Citation: YANG Zeng-hai, WANG Jian-ping, LIU Jia-jun, WANG Shou-guang, WANG Qing-yi, KANG Shu-guang, 2012. Characteristics and Its Geological Significance of Fluid Inclusions of the Wurinitu W-Mo Deposit in Inner Mongolia, China. Earth Science, 37(6): 1268-1278. doi: 10.3799/dqkx.2012.135

    内蒙古乌日尼图钨钼矿床成矿流体特征及地质意义

    doi: 10.3799/dqkx.2012.135
    基金项目: 

    中国地质调查局矿产资源调查评价专项工作项目"重要示范区带区域成矿系统研究" 1212011085471

    详细信息
      作者简介:

      杨增海(1982-), 男, 硕士研究生, 主要从事矿床学与矿床地球化学的研究.E-mail: yangzenghai21023@163.com

      通讯作者:

      王建平, E-mail: jpwang@cugb.edu.cn

    • 中图分类号: P611

    Characteristics and Its Geological Significance of Fluid Inclusions of the Wurinitu W-Mo Deposit in Inner Mongolia, China

    • 摘要: 乌日尼图钨钼矿位于内蒙古苏尼特左旗境内,是近几年该区新发现的较大规模的钨钼矿床.钨钼矿体主要产于燕山期花岗岩体的内外接触带附近,以细脉状矿化类型为主.该矿床中的流体包裹体主要发育气液两相、富气相、富液相和纯液相包裹体等类型.包裹体均一温度为130.0~371.7 ℃(峰值为160.0~260.0 ℃),盐度为0.2%~15.9% NaCl eqv(峰值为0.2%~12.5% NaCl eqv),属于中低温、中低盐度钨钼矿床.激光拉曼和群体包裹体成分分析结果表明,流体体系气相成分以H2O、CO2为主,其次为N2、O2以及少量CO、CH4、C2H2、C2H4和C2H6等; 液相成分以Ca2+、Na+、SO42-、Cl-为主,其次为K+、F-、NO3-、Mg2+以及少量Br-和Li+.成矿流体为H2O-NaCl-CO2体系.流体包裹体氢氧同位素分析表明,成矿流体的δ18O的含量范围为-2.11%~-0.11%,δD的含量范围为-85%~-108%,成矿流体为岩浆水与大气降水的混合物.结合矿床地质和成矿流体特征,认为该矿床为与燕山期岩浆活动有关的中低温热液石英脉型钨钼矿床,成矿物质以深源为主.

       

    • 图  1  乌日尼图钨钼矿床矿区地质简图(据内蒙古自治区第九地质矿产勘查开发院, 2011, 苏尼特左旗乌日尼图钨钼矿1∶2 000地形地质图修编)

      Qeol.第四系风成砂;Qp.第四系砾石层;O1-2w3.中下奥陶统乌宾敖包组三段;O1-2w2.中下奥陶统乌宾敖包组二段;γπ.花岗斑岩;SK.矽卡岩;1.地层界线及侵入岩接触界线;2.勘探线编号;3.钻孔位置;4.地层产状

      Fig.  1.  Simplified geological map of the Wurinitu tungsten and molybdenum deposit

      图  2  乌日尼图钨钼矿床550线勘探线剖面图(据内蒙古自治区地质调查院, 2010, 乌日尼图矿区550勘探线设计1∶1 000剖面图修编)

      1.第四系砾石层;2.中下奥陶统乌宾敖包组二段变质粉砂岩;3.中下奥陶统乌宾敖包组二段粉砂质板岩;4.花岗斑岩;5.细粒二长花岗岩;6.大理岩;7.破碎带;8.矿体;9.钻孔位置及编号

      Fig.  2.  Exploration profiles in 550 line of the Wurinitu tungsten and molybdenum deposit

      图  3  乌日尼图钨钼矿床矿石宏观及显微组构特征

      a.主成矿期细脉状辉钼矿;b.主成矿期颗粒状黄铁矿与板状黑钨矿共生;c.主成矿期辉钼矿与黑钨矿共生;d.显微镜下主成矿期板状黑钨矿与叶片状辉钼矿共生;Mo.辉钼矿;Py.黄铁矿;Wol.黑钨矿;Q.石英

      Fig.  3.  The petrofabric characteristics of ores from the Wurinitu tungsten and molybdenum deposit

      图  4  乌日尼图钨钼矿床中流体包裹体显微照片

      a.纯液相包裹体及气液两相包裹体共生同一个结晶平面;b.富气包裹体;c.富液包裹体;d.含2个气泡的包裹体

      Fig.  4.  Photomicrographs of fluid inclusions in the Wurinitu tungsten and molybdenum deposit

      图  5  石英流体包裹体均一温度与盐度直方图

      Fig.  5.  Histgrams of homogenization temperatures and salinity of fluid inclusions in quartz

      图  6  乌日尼图钨钼矿床流体包裹体激光拉曼分析光图谱

      a.气液两相包裹体中的CO2和CO32-;b.气液两相包裹体中的H2O;Qz.石英

      Fig.  6.  Laser Raman spectra of fluid inclusions in the Wurinitu tungsten and molybdenum deposit

      图  7  乌日尼图钨钼矿床成矿流体的δ18O-δD图解

      Fig.  7.  δ18O-δD diagram of ore-forming fluids in the Wurinitu tungsten and molybdenum deposit

      表  1  乌日尼图钨钼矿床石英中流体包裹体参数特征

      Table  1.   Parameter characteristics of fluid inclusion in quartz from the Wurinitu tungsten and molybdenum deposit

      样号 个数 大小(μm) 气液比(%) 冰点Tm, ice(℃) 均一温度Th(℃) 盐度(% NaCl eqv) 密度(g/cm3) 成矿压力(MPa) 成矿深度(km)
      WR-1 16 4.6~38.7 5~30 -8.1~-3.5(-6.3) 187.0~263.8(233.2) 5.7~12.1(9.5) 0.82~0.96(0.90) 51.79~74.46(64.13) 1.73~2.48(2.14)
      WR-2 14 4.1~13.5 10~15 -5.3~-0.3(-2.6) 224.1~243.0(238.5) 0.5~8.1(4.3) 0.81~0.88(0.85) 45.00~66.02(61.29) 1.50~2.20(2.04)
      WR-3 15 3.1~12.9 5~35 -9.3~-4.6(-7.1) 161.7~316.6(229.7) 7.3~13.2(10.5) 0.77~0.97(0.91) 44.39~78.28(63.42) 1.48~2.89(2.11)
      WR-4 16 2.0~6.5 5~20 -10.7~-3.8(-7.3) 174.4~321.1(234.6) 6.2~14.7 (10.7) 0.84~0.98(0.91) 48.38~89.48(64.79) 1.61~2.88(2.16)
      WR-6 15 3.3~12.5 5~15 -11.7~-0.3(-3.8) 130.0~260.5(208.2) 0.5~15.7 (6.0) 0.84~0.98(0.90) 30.30~70.90(55.10) 1.01~2.36(1.84)
      WR-15 14 2.7~17.5 5~20 -3.6~-0.3(-1.2) 168.2~258.9(215.5) 0.5~5.9 (2.0) 0.79~0.92(0.86) 39.02~65.47(50.86) 1.32~2.18(1.70)
      WR-16 15 4.0~22.3 3~20 -11.9~-3.0(-7.7) 159.8~352.6(223.3) 5.0~15.9 (11.2) 0.78~1.01(0.92) 44.49~97.99(61.64) 1.48~3.27(2.05)
      WR-18 15 3.5~10.6 5~35 -5.2~-1.6(-3.7) 162.4~271.4(209.6) 2.7~8.1 (6.0) 0.86~0.93(0.90) 42.47~74.05(56.51) 1.42~2.47(1.88)
      WR-21 16 3.7~20.6 5~15 -5.4~-0.1(-3.2) 170.0~236.6(209.6) 0.2~8.4 (5.2) 0.82~0.96(0.89) 29.46~ 63.90(53.95) 0.98~2.13(1.80)
      WR-22 14 3.0~30.2 5~15 -6.9~-3.9(-5.1) 174.9~216.5(201.1) 6.3~10.4 (7.9) 0.89~0.96(0.92) 48.18~59.81(55.00) 1.61~1.99(1.83)
      WR-25 14 3.3~18.1 5~25 -9.3~-0.2(-3.4) 171.8~272.5(212.7) 0.4~13.2(5.3) 0.84~0.94(0.89) 32.89~75.22 (53.16) 1.10~2.51(1.77)
      WR-26 16 2.0~9.5 3~30 -8.4~-2.6(-5.1) 139.7~334.5(211.0) 4.3~12.2(8.0) 0.77~0.99(0.91) 38.39~92.44(59.90) 1.28~3.08(2.00)
      WR-37 16 2.4~13.5 3~15 -6.1~-0.2(-3.4) 136.4~211.9(168.5) 0.4~9.3(5.4) 0.89~0.97(0.94) 21.09~56.91(45.44) 0.70~1.90(1.51)
      WR-41 16 5.2~15.5 5~15 -5.5~-1.0(-3.7) 179.5~265.5(205.0) 1.7~8.5(6.0) 0.81~0.95(0.90) 46.99~70.29(54.98) 1.57~2.34(1.83)
      WR-42 15 3.2~13.4 5~15 -5.2~-2.0(-3.9) 134.0~256.7(205.8) 3.4~8.1(6.2) 0.86~0.97(0.90) 35.99~70.34(55.65) 1.20~2.34(1.86)
      WR-46 16 3.2~14.6 10~15 -8.7~-0.1(-4.3) 219.5~305.7(259.4) 0.2~12.5(6.8) 0.74~0.90(0.84) 35.84~84.55(67.99) 1.19~2.82(2.27)
      WR-47 15 2.7~9.7 10~30 -6.3~-0.3(-2.8) 178.2~371.7(240.3) 0.5~9.3(5.2) 0.68~0.91(0.85) 41.66~102.09(62.04) 1.39~3.40(2.07)
      注:括号内为平均值.
      下载: 导出CSV

      表  2  乌日尼图钨钼矿床石英中流体包裹体群气相和液相成分(μg/g)

      Table  2.   Gas components and aqueous components of grouped fluid inclusions from quartz in the Wurinitu tungsten and molybdenum deposit

      样号 WR-1 WR-4 WR-6 WR-25 WR-26 WR-37
      样品名称 含矿石英脉 含矿石英脉 含矿石英脉 含矿石英脉 含矿石英脉 含矿石英脉
      CH4 1.134 0.091 0.138 0.659 0.240 0.122
      C2H2+C2H4 0.355 0.228 0.345 0.641 0.587 0.215
      C2H6 微量 微量 0.010 0.072 0.027 微量
      CO2 215.394 93.991 179.044 352.493 204.057 92.912
      H2O 217.082 204.064 60.020 421.716 178.399 174.747
      O2 8.623 9.626 19.379 9.512 12.011 8.343
      N2 42.338 45.142 93.596 58.817 63.648 39.963
      CO 15.688 11.242 48.108 93.460 70.792 13.137
      CO2/H2O 0.406 0.189 1.221 0.342 0.468 0.218
      CO2/N2 3.238 1.325 1.218 3.815 2.041 1.480
      Li+ 0.038 0.076 0.022 0.047 0 0.035
      Na+ 3.617 4.047 2.446 3.891 2.035 4.490
      K+ 2.269 3.439 2.223 1.949 2.940 2.434
      Mg2+ 0.025 0.028 0.043 0.031 0.029 0.021
      Ca2+ 1.481 2.145 3.002 2.347 2.333 1.600
      F- 0.454 0.263 0.289 0.671 0.166 0.372
      Cl- 2.968 2.712 2.757 3.672 2.126 4.532
      NO2- 0 0 0 0 0 0
      Br- 0 0 0.087 0.156 0 0
      NO3- 2.117 2.345 2.122 2.448 1.823 1.880
      SO42- 10.334 8.621 6.971 9.442 7.319 9.078
      (Na++K+)/(Ca2++Mg2+) 5.670 4.829 2.129 3.662 2.756 6.315
      Mg2+/Ca2+ 0.028 0.022 0.024 0.022 0.020 0.022
      Na+/K+ 2.711 2.001 1.871 3.395 1.177 3.137
      Na+/Ca2+ 4.258 3.289 1.420 2.890 1.521 4.892
      F-/Cl- 0.285 0.181 0.196 0.341 0.146 0.153
      Cl-/SO42- 0.778 0.852 1.072 1.054 0.787 1.353
      注:数据由中国地质科学院地质矿产资源研究所流体包裹体实验室分析,分析人杨丹.
      下载: 导出CSV

      表  3  乌日尼图钨钼矿床氢氧同位素测试结果

      Table  3.   Hydrogen and oxygen isotope data of the Wurinitu tungsten and molybdenum deposit

      样号 WR-1 WR-3 WR-16 WR-18 WR-21 WR-25 WR-26 WR-37 WR-42 WR-47
      产出位置 矿石 矿石 矿石 矿石 矿石 矿石 矿石 矿石 矿石 矿石
      测试矿物 石英 石英 石英 石英 石英 石英 石英 石英 石英 石英
      δ18O石英(%) 8.7 10.5 9.6 10.5 10.3 10.0 11.1 9.9 12.2 8.5
      δD(%) -99 -97 -105 -103 -85 -106 -108 -105 -87 -99
      δ18O(%) -1.91 -0.11 -1.01 -0.11 -0.31 -0.61 0.49 -0.71 1.59 -2.11
      下载: 导出CSV
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    出版历程
    • 收稿日期:  2012-07-19
    • 网络出版日期:  2021-11-09
    • 刊出日期:  2012-06-15

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