LA-ICP-MS zircon U-Pb ages and geologi-cal features of Daolundaba granite in Xilinhaote area, Inner Mongolia
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摘要:
采用LA-ICP-MS技术对内蒙古道伦达坝铜多金属矿区花岗岩中的锆石进行了U-Pb同位素测定，获得206Pb/238U年龄加权平均值为289.6±0.7Ma，表明岩体侵位于海西晚期。地球化学特征显示，该花岗岩具有强过铝质的特征，并与锡林浩特岩群片麻岩具有亲缘性，推测该期岩浆活动代表了碰撞高峰期后的岩石圈伸展事件。在这个过程中，岩石圈发生拆沉及随后的软流圈上涌或玄武岩浆的底侵，使下地壳的杂砂岩及黑云斜长片麻岩的温度迅速升高（大于875℃）而发生部分熔融形成强过铝质岩浆，同时该花岗岩又兼具火山弧的地球化学特征，推测可能与岩浆活动的滞后性有关，即俯冲板片的成分参与了岩浆的形成。结合区域内其他海西期岩体及海相地层的年代学和地球化学特征认为，该地区洋壳开始俯冲的时间应该在早石炭世末期，碰撞发生在早二叠世。
Abstract:The granite in the Daolundaba Cu polymetallic ore district was studied with ICP-MS zircon U-Pb isotope dating and geochemical method. A late Hercynian emplacement age of 289.6±0.7Ma was obtained, and the geochemical characteristics suggest a strongly peraluminous granite which has the affinity with the Xilinhaote rock group gneiss. The magmatic activity represents the litho-spheric extension after the peak of the collision event. During the process the lithosphere began delamination and was followed by the asthenosphere upwelling or basaltic magma underplating which led to the rapid increase of the temperature of the graywacke and bio-tite plagioclase gneiss in lower crust (> 875℃), which caused the formation of strongly peraluminous magma through partial melting. At the same time, the granite always had the geochemical features of volcanic arc and the granite had a relationship with the lag of magmatic activity, which means the composition of the subducting plate was involved in the formation of magma. Combined with the chronologic and geochemical features of Hercynian rocks and the marine strata in the nearby area, it is thought that the ocean crust in the area began to subduct during the late stage of Early Carboniferous and experienced collision during the Early Permian.
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Keywords:
- Inner Mongolia /
- Daolundaba /
- granite /
- Xilinhaote dike swarm /
- peraluminous /
- LA-ICP-MS zircon U-Pb ages
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致谢: 野外地质调查、采样和样品测试期间得到中国地质调查局天津地质调查中心司马献章院长及李承东研究员的大力帮助，在此一并表示谢意。
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图 1 道伦达坝铜矿矿区地质简图（据参考文献[1]修改）
1—第四系及河漫滩；2—上侏罗统布拉根哈达组；3—上侏罗统道特诺尔组；4—上二叠统林西组；5—下古生界锡林郭勒杂岩；6—印支期黑云花岗岩；7—华力西晚期角闪辉长岩；8—闪长岩脉、花岗细晶岩脉、闪长斑岩脉和石英脉；9—断裂
Figure 1. Simplified geological map of the Daolundaba mining area
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图 2 道伦达坝花岗岩野外（a）及镜下显微（b）照片
Q—石英；Pl—斜长石；Mic—微斜长石；Bi—黑云母
Figure 2. Daolundaba granite field photograph (a) and microphotograph (b)
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图 3 道伦达坝花岗岩样品Zr/DLDB2锆石阴极发光图像
Figure 3. Cathodoluminescence image of the zircon from Daolundaba granite
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图 4 道伦达坝黑云母花岗岩锆石U-Pb谐和图
Figure 4. U-Pb concordia diagram of the zircon in the Daolundaba biotite granite
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图 6 道伦达坝花岗岩球粒陨石稀土元素配分图解和微量元素蛛网图解（标准化数据据参考文献[13]）
Figure 6. Chondrite-normalized REE patterns and primitive mantle normalized spidergrams of Daolundaba granite
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图 7 道伦达坝花岗岩(Y+Nb)-Rb判别图解[19]
Syn-COLG—同碰撞花岗岩；WPG—板内花岗岩；VAG—火山弧花岗岩；ORG—洋中脊花岗岩
Figure 7. (Y+Nb)-Rb discrimination diagrams of Daolundaba granite
表 1 道伦达坝铜多金属矿区黑云母花岗岩样品（Zr/DLDB2）锆石U-Pb同位素测定结果
Table 1 LA-ICP-MS U-Pb isotope composition of the zircon from biotite granite sample (Zr/DLDB2) in the Daolundaba copper-polymetallic deposit
测点号 含量/10-6 同位素比值 年龄/Ma Pb U 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 208Pb/232Th 1σ 232Th/238U 1σ 206Pb/238U 1σ 207Pb/235U 1σ 1 12 238 0.0511 0.0003 0.3732 0.0083 0.0530 0.0012 0.0133 0.0006 0.2096 0.0050 328.3 2.0 344.3 5.8 2 15 310 0.0510 0.0005 0.3697 0.0063 0.0525 0.0008 0.0092 0.0004 0.3196 0.0058 302.0 2.4 300.8 6.1 2.1 24 483 0.0506 0.0004 0.3717 0.0064 0.0532 0.0008 0.0103 0.0004 0.2986 0.0059 300.6 2.1 298.5 4.3 3 31 733 0.0459 0.0003 0.3262 0.0035 0.0515 0.0005 0.0125 0.0004 0.0608 0.0001 301.2 1.7 296.2 2.9 4 17 404 0.0460 0.0004 0.3327 0.0046 0.0524 0.0006 0.0124 0.0004 0.0831 0.0010 300.0 2.2 298.5 3.9 5 10 221 0.0460 0.0003 0.3235 0.0058 0.0510 0.0009 0.0115 0.0003 0.4489 0.0039 280.6 1.9 284.0 6.7 6 13 269 0.0460 0.0003 0.3311 0.0060 0.0522 0.0009 0.0113 0.0003 0.4704 0.0054 297.8 1.8 303.1 5.1 7 9 191 0.0455 0.0003 0.3364 0.0076 0.0536 0.0012 0.0119 0.0003 0.4440 0.0006 280.0 1.9 278.8 4.8 8 3 61 0.0458 0.0003 0.3244 0.0311 0.0513 0.0048 0.0124 0.0008 0.4779 0.0018 303.0 7.7 512.7 110.4 9 13 275 0.0464 0.0003 0.3271 0.0050 0.0512 0.0008 0.0122 0.0003 0.5665 0.0016 282.0 2.2 274.7 4.3 10 13 271 0.0462 0.0003 0.3321 0.0051 0.0521 0.0007 0.0129 0.0003 0.6270 0.0073 296.4 1.8 294.6 4.5 11 12 261 0.0464 0.0003 0.3327 0.0061 0.0521 0.0009 0.0112 0.0003 0.3297 0.0066 281.7 2.0 275.9 5.2 12 11 254 0.0460 0.0003 0.3316 0.0058 0.0523 0.0009 0.0115 0.0003 0.3016 0.0019 279.9 1.8 281.3 6.7 13 10 207 0.0480 0.0003 0.3787 0.0072 0.0573 0.0010 0.0131 0.0004 0.3023 0.0017 300.9 1.8 301.6 5.8 13.1 42 1003 0.0460 0.0003 0.3258 0.0032 0.0514 0.0005 0.0120 0.0004 0.0499 0.0004 281.4 2.0 278.8 2.7 14 13 268 0.0456 0.0003 0.3322 0.0053 0.0528 0.0008 0.0106 0.0003 0.8044 0.0063 280.4 1.8 281.1 4.3 15 7 123 0.0460 0.0004 0.3257 0.0102 0.0513 0.0015 0.0104 0.0004 1.3430 0.0106 292.2 2.3 288.4 8.6 16 13 292 0.0454 0.0003 0.3153 0.0064 0.0503 0.0010 0.0085 0.0004 0.3169 0.0017 283.2 1.8 276.9 4.5 17 13 304 0.0464 0.0003 0.3345 0.0047 0.0523 0.0007 0.0093 0.0004 0.0628 0.0007 298.2 2.0 298.6 4.1 18 14 308 0.0465 0.0003 0.3322 0.0068 0.0518 0.0011 0.0089 0.0003 0.3602 0.0022 304.2 2.1 294.4 4.5 19 5 95 0.0476 0.0003 0.4393 0.0141 0.0669 0.0021 0.0122 0.0004 0.7509 0.0041 299.6 2.1 369.0 11.8 20 23 538 0.0458 0.0003 0.3285 0.0034 0.0521 0.0005 0.0105 0.0003 0.1959 0.0008 279.9 2.0 279.6 3.1 21 10 210 0.0457 0.0003 0.3314 0.0076 0.0526 0.0011 0.0142 0.0004 0.4262 0.0012 280.7 2.1 281.4 5.5 22 12 261 0.0467 0.0004 0.3349 0.0053 0.0521 0.0008 0.0115 0.0003 0.4353 0.0027 301.3 2.2 301.3 4.7 23 10 233 0.0460 0.0003 0.3273 0.0052 0.0516 0.0008 0.0149 0.0004 0.2125 0.0020 280.1 2.1 281.5 5.1 24 16 351 0.0459 0.0003 0.3326 0.0045 0.0525 0.0007 0.0125 0.0003 0.2121 0.0015 280.0 2.1 280.3 3.7 25 18 412 0.0454 0.0003 0.3224 0.0040 0.0514 0.0006 0.0127 0.0003 0.2931 0.0050 278.9 2.1 279.9 3.6 26 12 260 0.0457 0.0004 0.3280 0.0054 0.0520 0.0009 0.0123 0.0003 0.4469 0.0037 300.2 2.0 300.0 4.5 27 24 551 0.0457 0.0003 0.3274 0.0038 0.0519 0.0006 0.0136 0.0004 0.1028 0.0004 281.9 1.7 282.9 2.8 28 16 367 0.0458 0.0003 0.3330 0.0045 0.0527 0.0007 0.0128 0.0003 0.2703 0.0007 279.8 1.9 280.1 3.7 29 19 373 0.0458 0.0003 0.3331 0.0049 0.0528 0.0007 0.0129 0.0002 0.7798 0.0062 280.1 2.2 282.3 4.1 30 7 157 0.0462 0.0003 0.3305 0.0091 0.0518 0.0014 0.0132 0.0003 0.3751 0.0017 300.3 2.1 295.1 6.8 31 11 252 0.0460 0.0003 0.3271 0.0054 0.0515 0.0008 0.0124 0.0003 0.1990 0.0009 295.1 1.9 299.2 4.4 31.1 110 803 0.1298 0.0009 1.2062 0.0112 0.0674 0.0005 0.0381 0.0007 0.5050 0.0079 787.0 5.2 803.4 7.5 31.2 56 556 0.0958 0.0009 0.8659 0.0143 0.0655 0.0009 0.0313 0.0008 0.4167 0.0104 589.8 5.5 633.3 10.4 32 9 189 0.0460 0.0003 0.3305 0.0078 0.0521 0.0012 0.0121 0.0003 0.4457 0.0027 300.1 2.0 303.0 5.5 33 2 41 0.0461 0.0004 0.3307 0.0296 0.0520 0.0046 0.0118 0.0003 1.4019 0.0110 297.9 2.5 305.0 23.0 注：同位素比值和年龄误差均为1σ绝对误差；3~12、13.1~18、20~31、32、33共30点的206Pb/238U年龄加权平均值为289.6±0.7Ma。其中2与2.1、13与13.1、31.1和31.2分别为同一个样品不同部位打的点（图 3） 
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表 2 道伦达坝铜多金属矿床的花岗岩的主量、微量和稀土元素分析结果
Table 2 Major, trace, and rare earth elements analyses of granite in the Daolundaba copper-polymetallic deposit
样品 GSY1/DLDB2 GSY1/DLDB4 PD2 WZK1 WZK2 0311-37-1 0311-47-1 2140-1-5 S83335-2* S8335-3* 07DL-10 数据来源 本文 [1] [6] [2] SiO2 67.09 66.02 68.9 67.17 70.27 70.15 73.14 68.6 64.41 71.37 Al2O3 15.52 15.26 14.85 15.61 14.96 12.32 12.26 12.9 16.8 13.89 Fe2O3 0.48 0.36 0.57 0.67 0.33 0.92 1.36 1.00 0.50 0.74 FeO 3.49 4.40 3.12 3.38 2.62 5.25 2.5 0 3.15 4.40 2.75 CaO 2.04 1.44 1.68 2.17 1.77 0.87 1.11 2.58 1.40 0.66 MgO 1.19 1.16 0.95 1.02 0.73 2.42 1.68 2.60 1.88 1.4 K2O 3.98 4.35 4.54 4.19 4.11 3.11 2.89 5.09 4.02 3.55 Na2O 4.04 4.36 3.41 3.35 3.05 2.13 2.13 1.62 3.33 2.90 TiO2 0.58 0.58 0.51 0.62 0.42 0.65 0.56 0.59 0.81 0.59 P2O5 0.19 0.20 0.17 0.25 0.21 0.07 0.13 0.16 0.14 0.10 MnO 0.049 0.046 0.07 0.07 0.06 0.69 0.05 0.07 0.03 0.06 灼失量 0.65 1.03 CO2 0.15 0.33 0.04 0.04 0.06 0.39 0.20 TFeO 6.08 3.72 4.05 4.85 3.42 H2O+ 1.05 1.12 1.16 1.17 1.90 1.32 1.66 1.57 Cr 18.8 17.9 75.77 88.17 58.05 53.5 39.2 Ni 10.3 9.45 49.55 31.3 31.96 19.8 18.4 Co 7.10 4.03 91.59 101.1 60.63 9.99 6.16 Li 30.2 40.4 Rb 132 236 136 133 177 114 133 Cs 8.99 15.1 11.15 3.85 9.57 7.59 12.9 0.27 W 1.35 2.45 Mo 1.08 1.39 Ba 1060 811 783.9 661.6 1415 705 903 19.7 V 49.1 47.9 81.76 77.64 76.6 128 85 Nb 14.7 13.4 11.61 11.88 12.79 10.7 10.3 0.74 Zr 279 270 135.6 198.6 180.8 214 196 11.4 Be 2.50 1.41 U 2.77 3.00 1.34 2.85 1.99 1.99 1.6 0.07 Th 20.0 17.7 12.27 18.03 13.7 9.55 10 0.42 La 49.2 37.9 34.97 42.29 30.79 17.05 16.24 30.33 29 17.7 3.47 Ce 119 90.3 61.87 83.64 59.56 53.74 56.71 62.95 68.5 46.4 7.814 Pr 13.3 10.1 9.1 10.89 8.22 4.27 4.33 7.47 7.01 4.72 1.001 Nd 51.2 38.3 32.99 42.73 30.41 15.93 16.07 28.47 29.3 19.3 3.5 Sm 10.5 8.06 6.61 8.7 6.26 3.36 3.02 5.76 5.78 3.93 0.684 Eu 1.33 1.06 0.94 1.25 1.18 0.97 0.81 1.25 1.27 1.02 0.063 Gd 9.67 7.84 6.73 8.5 6.28 3.37 2.98 5.23 4.78 3.09 0.575 Tb 1.55 1.32 1.04 1.25 0.95 0.54 0.48 0.82 0.78 0.52 0.075 Dy 8.32 7.65 6.36 6.99 5.43 3.52 2.844 4.755 4.95 3.45 0.383 Ho 1.54 1.49 1.27 1.35 1.05 0.78 0.55 0.92 1.06 0.79 0.063 Er 4.38 4.45 3.43 3.81 3.01 2.35 1.64 2.67 2.78 2.11 0.19 Tm 0.62 0.63 0.55 0.57 0.46 0.39 0.27 0.42 0.44 0.33 0.029 Yb 3.85 4.04 3.45 3.61 2.85 2.6 1.84 2.73 3.13 2.45 0.211 Lu 0.59 0.62 0.51 0.55 0.42 0.39 0.27 0.4 0.42 0.36 0.036 Y 42.7 42.4 31.46 31.71 25.01 21.23 13.2 25.54 29.5 21.9 1.23 Ta 0.84 0.86 1.32 1.39 1.28 0.7 0.75 Ga 21.54 17.53 18.38 20.2 16.9 Sr 126.6 135 197.6 285 167 Hf 4.15 5.965 5.98 5.53 5.18 SREE 275.05 213.76 169.82 216.13 156.87 109.25 108.05 154.17 159.2 106.17 18.09 LREE/HREE 8.01 6.62 6.28 7.12 6.67 6.84 8.93 7.59 7.68 7.1 10.58 δEu 0.40 0.40 0.43 0.44 0.57 0.87 0.81 0.68 0.72 0.86 0.31 δCe 1.12 1.11 0.83 0.93 0.90 1.5 1.62 1 1.14 1.21 1.01 (La/Yb)N 9.17 6.73 7.27 8.40 7.75 4.71 6.35 7.97 6.65 5.18 11.09 Al2O3/TiO2 26.76 26.31 29.12 25.18 35.62 18.95 21.89 21.86 20.74 23.54 A/CNK 1.54 1.50 1.54 1.61 1.68 2.02 2.00 1.39 1.92 1.95
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