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    西藏班戈地区雪如岩体的形成环境及成矿意义

    高顺宝 郑有业 谢名臣 张众 闫学欣 武斌 罗俊杰

    高顺宝, 郑有业, 谢名臣, 张众, 闫学欣, 武斌, 罗俊杰, 2011. 西藏班戈地区雪如岩体的形成环境及成矿意义. 地球科学, 36(4): 729-739. doi: 10.3799/dqkx.2011.073
    引用本文: 高顺宝, 郑有业, 谢名臣, 张众, 闫学欣, 武斌, 罗俊杰, 2011. 西藏班戈地区雪如岩体的形成环境及成矿意义. 地球科学, 36(4): 729-739. doi: 10.3799/dqkx.2011.073
    GAO Shun-bao, ZHENG You-ye, XIE Ming-chen, ZHANG Zhong, YAN Xue-xin, WU Bin, LUO Jun-jie, 2011. Geodynamic Setting and Mineralizational Implication of the Xueru Intrusion in Ban'ge, Tibet. Earth Science, 36(4): 729-739. doi: 10.3799/dqkx.2011.073
    Citation: GAO Shun-bao, ZHENG You-ye, XIE Ming-chen, ZHANG Zhong, YAN Xue-xin, WU Bin, LUO Jun-jie, 2011. Geodynamic Setting and Mineralizational Implication of the Xueru Intrusion in Ban'ge, Tibet. Earth Science, 36(4): 729-739. doi: 10.3799/dqkx.2011.073

    西藏班戈地区雪如岩体的形成环境及成矿意义

    doi: 10.3799/dqkx.2011.073
    基金项目: 

    青藏高原矿产调查评价专项项目 1212010818038

    详细信息
      作者简介:

      高顺宝(1980-),男,博士研究生,矿产普查与勘探专业.E-mail: gaoshunbao2002@163.com

    • 中图分类号: P618.2

    Geodynamic Setting and Mineralizational Implication of the Xueru Intrusion in Ban'ge, Tibet

    • 摘要: 雪如岩体主要由中细粒二长花岗岩、中粗粒斑状二长花岗岩组成,在其与郎山组灰岩接触带附近发育有大量的矽卡岩型铜铁矿床或矿化点.岩石及锆石LA-ICP-MS U-Pb、XRF、ICP-AES等分析显示,雪如岩体富K2O、SiO2、LREE及Rb、Ba、Pb、Th等大离子亲石元素,而Nb、Ta、Sr、Ti等高场强元素含量相对较低,稀土元素配分曲线为明显的右倾曲线,具有中等的负Eu异常,属高钾钙碱性-钾玄岩岩石系列和后碰撞花岗岩类,成岩时代分别为79.25±0.97 Ma和79.72±0.51 Ma,形成于早白垩世末-晚白垩世初班公湖-怒江缝合带闭合后、羌塘地体与拉萨地体的后碰撞阶段.综合认为,雪如岩体岩浆源区为下地壳富含流体的石榴石角闪岩相-斜长角闪岩相的镁铁质岩石,是在后碰撞环境下经部分熔融形成的花岗岩类,对班戈地区铜铁多金属成矿非常有利;矽卡岩型铜铁成矿作用发生于80 Ma左右,该认识为区域找矿指明了方向.

       

    • 图  1  雪如岩体地质简图

      图 1据辽宁地调院1∶25万多巴幅(2003)和西藏地调院1∶25万班戈幅(2002)地质图修改;1.第四系;2.牛堡组;3.竞柱山组;4.郎山组;5.多尼组下段;6.多尼组上段弄巴砾岩;7.拉贡塘组;8.始新世二长花岗岩;9.晚白垩世二长花岗岩(雪如岩体);10.早白垩世二长花岗岩(多巴岩体);11.早白垩世花岗闪长岩(班戈岩体);12.地质界线;13.断层;14.研究区位置;15.铜矿床(点);16.采样位置

      Fig.  1.  Geological sketch map of the Xueru intrusion

      图  2  雪如岩体锆石阴极发光图像

      Fig.  2.  CL images of zircons for the Xueru intrusion

      图  3  雪如岩体锆石U-Pb谐和图

      Fig.  3.  U-Pb concordia diagrams of zircons for the Xueru intrusion

      图  4  雪如岩体稀土元素配分模式(球粒陨石标准化值引自Sun and McDonough, 1989)

      Fig.  4.  Chondrite-normalized patterns for the Xueru intrusion

      图  5  雪如岩体微量元素蜘蛛图解(原始地幔标准化值引自Sun and McDonough, 1989)

      Fig.  5.  Primitive mantle-normalized trace element spidergrams for the Xueru intrusion

      图  6  雪如岩体(La/Yb)N-YbN图解(Drummond and Defant, 1990)

      Fig.  6.  (La/Yb)N vs YbN diagram of the Xueru intrusion

      图  7  雪如岩体R1-R2图解(底图据Batchelor and Bowden, 1985)

      Fig.  7.  R1 vs. R2 diagram for the Xueru intrusion

      图  8  雪如岩体Rb-(Y+Nb)图解(底图据Pearce, 1996)

      Fig.  8.  Rb vs. (Y+Nb) diagram for the Xueru intrusion

      表  1  YQ-1、PM401TW9样品锆石LA-ICP-MS同位素分析结果

      Table  1.   U-Pb LA-ICP-MS analyses of zircon from Sample YQ-1 and PM401TW9

      点号 Pb(10-6) Th(10-6) U(10-6) Th/U 207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U 206Pb/238U 备注
      比值 1σ 比值 1σ 比值 1σ t (Ma) 1σ t (Ma) 1σ t (Ma) 1σ
      YQ-1-01 33.7 735 1330 0.55 0.048 4 0.001 7 0.080 6 0.002 7 0.012 1 0.000 1 117 79.6 78.7 2.5 77.6 0.67 排除
      YQ -1-02 29.0 817 689 1.19 0.049 8 0.001 8 0.085 6 0.003 0 0.012 6 0.000 1 187 118 83.4 2.83 80.4 0.91
      YQ -1-03 27.3 608 990 0.61 0.049 1 0.001 6 0.085 6 0.002 8 0.012 6 0.000 1 154 75.9 83.4 2.64 80.8 0.84
      YQ -1-04 21.7 584 556 1.05 0.051 3 0.002 4 0.086 8 0.003 9 0.012 3 0.000 1 254 112 84.5 3.67 79.1 0.94
      YQ -1-05 9.2 241 260 0.93 0.054 9 0.003 2 0.092 1 0.005 0 0.012 4 0.000 2 409 133 89.5 4.6 79.2 1.33 排除
      YQ -1-06 49.2 1256 1521 0.83 0.050 0 0.001 6 0.082 6 0.002 5 0.012 0 0.000 1 195 106 80.6 2.38 76.7 0.74 排除
      YQ -1-07 20.5 468 622 0.75 0.049 5 0.002 3 0.086 1 0.003 9 0.012 6 0.000 2 172 107 83.9 3.66 81.0 0.99
      YQ-1-08 25.0 560 889 0.63 0.047 7 0.001 7 0.080 8 0.002 8 0.012 3 0.000 1 87 81 78.9 2.67 79.0 0.82
      YQ-1-09 34.1 821 1018 0.81 0.056 4 0.001 9 0.094 8 0.003 1 0.012 2 0.000 1 478 76 92.0 2.89 78.4 0.85
      YQ-1-10 50.8 747 2759 0.27 0.047 4 0.001 1 0.081 1 0.001 9 0.012 4 0.000 1 78 56 79.2 1.80 79.4 0.78
      YQ-1-11 24.5 570 781 0.73 0.048 4 0.001 8 0.083 2 0.003 0 0.012 5 0.000 1 120 89 81.2 2.86 80.1 0.88
      YQ-1-12 33.2 778 1140 0.68 0.051 3 0.002 3 0.087 1 0.003 7 0.012 4 0.000 1 254 102 84.8 3.47 79.1 0.72
      YQ-1-13 10.8 214 433 0.49 0.051 6 0.002 3 0.087 5 0.003 8 0.012 4 0.000 2 333 104 85.2 3.56 79.4 1.01
      YQ-1-14 31.2 670 1062 0.63 0.050 0 0.001 5 0.088 6 0.002 6 0.012 9 0.000 1 195 68.5 86.2 2.41 82.4 0.82 排除
      YQ-1-15 10.6 358 121 2.95 0.071 4 0.005 7 0.115 6 0.008 8 0.012 5 0.000 3 969 165 111 7.99 80.0 1.75 排除
      YQ-1-16 15.1 402 335 1.20 0.048 5 0.002 6 0.088 4 0.004 7 0.014 1 0.000 9 124 119 86.0 4.41 90.5 5.55 排除
      YQ-1-17 46.3 1461 698 2.09 0.042 6 0.001 6 0.074 4 0.002 9 0.012 6 0.000 1 error error 72.8 2.73 80.8 0.86
      PM401TW9-01 13.9 771 1023 0.75 0.048 6 0.001 4 0.081 2 0.002 3 0.012 1 0.000 1 128 68.5 79.3 2.20 77.7 0.76
      PM401TW9-02 3.0 238 186 1.28 0.060 9 0.003 4 0.104 6 0.006 0 0.012 5 0.000 2 635 122 101 5.52 79.9 1.45
      PM401TW9-03 22.8 738 1585 0.47 0.052 1 0.001 7 0.098 6 0.003 6 0.013 7 0.000 2 300 75.9 95.4 3.3 87.5 0.96 排除
      PM401TW9-04 8.6 502 607 0.83 0.047 7 0.002 1 0.081 1 0.003 6 0.012 3 0.000 1 87.1 100.0 79.2 3.36 78.9 0.82
      PM401TW9-05 8.6 438 573 0.77 0.055 8 0.002 0 0.100 7 0.003 6 0.013 1 0.000 1 456 79.6 97.4 3.3 83.8 0.84 排除
      PM401TW9-06 22.0 685 1561 0.44 0.046 7 0.001 3 0.088 3 0.002 3 0.013 7 0.000 1 35.3 63.0 85.9 2.2 87.8 0.80 排除
      PM401TW9-07 10.4 446 767 0.58 0.054 0 0.001 8 0.094 4 0.003 1 0.012 7 0.000 2 372 72.2 91.6 2.91 81.4 0.97
      PM401TW9-08 11.3 594 852 0.70 0.050 6 0.001 6 0.084 0 0.002 6 0.012 1 0.000 1 233 72.2 81.9 2.45 77.3 0.87
      PM401TW9-09 12.2 651 887 0.73 0.047 1 0.001 6 0.081 1 0.002 8 0.012 5 0.000 1 53.8 77.8 79.2 2.63 80.1 0.93
      PM401TW9-10 13.9 727 1109 0.66 0.050 6 0.001 4 0.088 1 0.002 5 0.012 6 0.000 1 220 64.8 85.7 2.33 80.7 0.80
      PM401TW9-11 10.1 411 783 0.52 0.050 6 0.001 8 0.086 1 0.003 0 0.012 4 0.000 1 233 83.3 83.8 2.79 79.2 0.82
      PM401TW9-12 9.0 375 705 0.53 0.051 4 0.002 1 0.085 4 0.003 4 0.012 1 0.000 1 257 93 83.2 3.15 77.5 0.83
      PM401TW9-13 20.7 913 1547 0.59 0.047 2 0.001 4 0.082 9 0.002 5 0.012 8 0.000 1 57.5 70.4 80.8 2.32 81.7 0.84
      PM401TW9-14 8.7 545 623 0.88 0.054 3 0.002 3 0.090 6 0.003 8 0.012 2 0.000 1 383 98.1 88.1 3.54 78.1 0.89
      PM401TW9-15 6.5 361 462 0.78 0.047 5 0.002 2 0.080 8 0.003 8 0.012 5 0.000 1 72.3 117 78.9 3.55 79.8 0.95
      下载: 导出CSV

      表  2  雪如岩体主量(%)、稀土和微量元素(10-6)分析结果

      Table  2.   Major elements (%) and trace elements (10-6) of the Xueru intrusion

      样号 YQ-1 YQ-2 YQ-3 YQ-4 YQ-5 PM401YQ9 PM301YQ31 平均值
      岩性 斑状二长花岗岩
      SiO2 72.77 72.85 70.53 71.86 76.09 73.39 72.39 72.84
      TiO2 0.39 0.39 0.46 0.37 0.23 0.3 0.36 0.36
      Al2O3 12.91 13.07 13.34 13.47 11.93 13.17 13.23 13.02
      Fe2O3 0.94 0.86 0.83 0.31 0.31 0.73 0.92 0.70
      FeO 1.18 1.23 1.2 0.8 0.38 1.05 1.17 1.00
      MnO 0.04 0.04 0.04 0.03 0.02 0.05 0.06 0.04
      MgO 0.73 0.75 0.91 0.83 0.46 0.52 0.74 0.71
      CaO 1.76 1.63 2.57 3.04 0.92 1.31 1.64 1.84
      Na2O 3.19 3.16 3.47 3.14 2.31 3.31 3.66 3.18
      K2O 5.05 5.11 5.55 5.05 6.33 5.07 4.88 5.29
      P2O5 0.12 0.12 0.14 0.11 0.09 0.08 0.12 0.11
      H2O+ 0.4 0.37 0.49 0.53 0.59 0.6 0.45 0.49
      CO2 0.3 0.22 0.22 0.22 0.22 0.22 0.15 0.22
      TOTAL 99.78 99.8 99.75 99.76 99.88 99.8 99.77 99.79
      Mg# 39 40 46 58 56 35 40 45
      R1 2 466.21 2 468.78 2 101.38 2 450.24 2 742.68 2 471.34 2 315.32 2 430.85
      R2 477.77 467.99 581.80 630.66 355.27 424.30 471.70 487.07
      σ 2.28 2.29 2.96 2.32 2.26 2.31 2.48 2.41
      A/NCK 0.93 0.95 0.81 0.83 0.97 0.99 0.93 0.92
      La 51.61 63.73 60.71 50.11 38.8 58.93 54.45 54.05
      Ce 101.4 115.8 114.2 99.2 71.43 94.39 100.5 99.56
      Pr 11.94 12.88 12.89 11.21 7.38 11.2 11.23 11.25
      Nd 41.26 44.63 44.22 38.41 24.11 34.29 36.52 37.63
      Sm 6.62 7.06 7.08 5.99 3.93 5.55 6.25 6.07
      Eu 1.04 1.11 1.28 1.04 0.57 0.96 0.94 0.99
      Gd 5.06 5.32 5.26 4.28 3.09 4.02 4.95 4.57
      Tb 0.73 0.76 0.75 0.56 0.46 0.58 0.76 0.66
      Dy 3.86 4.04 3.9 2.65 2.61 3.12 3.83 3.43
      Ho 0.79 0.83 0.78 0.53 0.54 0.66 0.77 0.70
      Er 2.25 2.4 2.05 1.36 1.65 1.84 2.08 1.95
      Tm 0.36 0.37 0.32 0.22 0.27 0.31 0.35 0.31
      Yb 2.37 2.41 2.1 1.37 1.88 2.14 2.16 2.06
      Lu 0.37 0.38 0.33 0.22 0.27 0.38 0.36 0.33
      LREE 213.87 245.21 240.38 205.96 146.22 205.32 209.89 209.55
      HREE 15.79 16.51 15.49 11.19 10.77 13.05 15.26 14.01
      L/H 13.54 14.85 15.52 18.41 13.58 15.73 13.75 15.06
      δEu 0.53 0.53 0.61 0.60 0.48 0.59 0.50 0.55
      (La/Sm)N 5.03 5.83 5.54 5.40 6.37 6.85 5.62 5.81
      (Gd/Yb)N 1.77 1.83 2.07 2.58 1.36 1.55 1.90 1.87
      Rb 289 300 270 234 387 369 339 312.57
      Ba 425 456 522 411 282 341 348 397.86
      Th 34.8 37.2 24.7 30.6 38.9 30.4 28.5 32.16
      U 8.12 9.13 5.57 5.06 10.9 5.45 4.87 7.01
      Nb 18.7 20.2 16.8 15.4 16.2 17 18.5 17.54
      Ta 2.06 2.33 1.61 1.09 1.81 1.75 2.09 1.82
      Pb 33.6 33.6 34 56.6 35.3 32.6 30 36.53
      Sr 206 208 305 292 144 194 203 221.71
      Hf 7.2 7.2 8 6.6 6.8 5.4 5.5 6.67
      Zr 177 179 196 177 132 149 178 169.71
      Y 20.33 21.22 19.14 12.71 14.62 17.72 20.03 17.97
      Cu 24 23.1 71.4 22.8 16.4 10.9 9.21 25.40
      Mo 1.42 1.83 1.13 1.2 1.73 0.085 0.25 1.09
      Zn 29.76 33.32 41.24 25.73 34.35 34.3 219 59.67
      Nb/Ta 9.08 8.67 10.43 14.13 8.95 9.71 8.85 9.98
      Rb/Sr 1.40 1.44 0.89 0.80 2.69 1.90 1.67 1.54
      Th/U 4.29 4.07 4.43 6.05 3.57 5.58 5.85 4.83
      Y/Yb 8.58 8.80 9.11 9.28 7.78 8.28 9.27 8.72
      注:σ=(K2O+Na2O)2/(SiO2-43);A/NCK=Al2O3(mol)/(CaO+Na2O+K2O)(mol);δEu=2EuN/(SmN+GdN);Mg#=100Mg2+/(Mg2++Fe2+(Total));R1=4Si-11(Na+K)-2(Ti+Fe);R2=Al+2Mg+6Ca.
      下载: 导出CSV
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    • 收稿日期:  2010-05-12
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