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滇西南勐海布朗山奥陶纪花岗岩锆石U-Pb年龄、Hf同位素组成特征及其构造意义

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孙载波, 胡绍斌, 周坤, 王云晓, 刘桂春, 吴嘉林, 赵江泰. 滇西南勐海布朗山奥陶纪花岗岩锆石U-Pb年龄、Hf同位素组成特征及其构造意义[J]. 地质通报, 2018, 37(11): 2044-2054.
引用本文: 孙载波, 胡绍斌, 周坤, 王云晓, 刘桂春, 吴嘉林, 赵江泰. 滇西南勐海布朗山奥陶纪花岗岩锆石U-Pb年龄、Hf同位素组成特征及其构造意义[J]. 地质通报, 2018, 37(11): 2044-2054.
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SUN Zaibo, HU Shaobin, ZHOU Kun, WANG Yunxiao, LIU Guichun, WU Jialin, ZHAO Jiangtai. Zircon U-Pb age, Hf isotopic composition of the Bulangshan Ordovician granite in the Menghai area, southwestern Yunnan Province, and its tectonic significance[J]. Geological Bulletin of China, 2018, 37(11): 2044-2054.
Citation: SUN Zaibo, HU Shaobin, ZHOU Kun, WANG Yunxiao, LIU Guichun, WU Jialin, ZHAO Jiangtai. Zircon U-Pb age, Hf isotopic composition of the Bulangshan Ordovician granite in the Menghai area, southwestern Yunnan Province, and its tectonic significance[J]. Geological Bulletin of China, 2018, 37(11): 2044-2054.
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滇西南勐海布朗山奥陶纪花岗岩锆石U-Pb年龄、Hf同位素组成特征及其构造意义

  • 1.

    云南省地质调查院, 云南 昆明 650216

  • 2.

    自然资源部三江成矿作用及资源勘查利用重点实验室, 云南 昆明 650061

  • 3.

    云南省自然资源厅, 云南 昆明 650224

  • 基金项目:
    云南省国土资源厅地勘基金项目《云南1：5万曼各、小街、曼班、大勐龙、万纳兰、勐宋坝六幅区域地质调查》（编号：D2017014）、中国地质调查局项目《云南区域地质调查片区总结与服务产品开发》（编号：DD20160345-02）和云南省科技厅科技领军人才培养计划项目《西南“三江”叠合成矿作用与成矿预测》（编号：2013HA001）
详细信息
    作者简介: 孙载波(1981-), 男, 硕士, 高级工程师, 从事区域地质调查研究。E-mail:ynddyszb@163.com

  • 中图分类号: P534.42;P588.12+1

Zircon U-Pb age, Hf isotopic composition of the Bulangshan Ordovician granite in the Menghai area, southwestern Yunnan Province, and its tectonic significance

  • 1.

    Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China

  • 2.

    Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization, Ministry of Natural Resources, Kunming 650061, Yunnan, China

  • 3.

    Department of Natural Resources of Yunnan Province, Kunming 650224, Yunnan, China

    摘要

  • 对滇西南勐海布朗山花岗岩进行LA-ICP-MS锆石U-Pb年龄测试，获得该花岗岩的206Pb/238U年龄加权平均值为458.5±3.0Ma（n=21，MSWD=2.3），属中-晚奥陶世的产物。样品锆石的εHf（t）变化范围为-2.4~0.9之间，平均值为-0.9；亏损地壳模式年龄tDMC变化范围为1.41~1.58Ga，加权平均值为1.49Ga。岩石地球化学特征表明，该花岗岩具有高SiO2（75.79%~77.56%）、富碱（K2O+Na2O=7.39%~8.42%）、中-高钾（K2O/Na2O=1.23~1.95）、低MgO（0.14%~0.27%）、低CaO（0.05%~0.64%）的特征。铝过饱和指数A/CNK值介于1.02~1.27之间，岩石属高钾钙碱性强过铝S型花岗岩。岩石稀土元素总体表现为由轻稀土元素富集型向平坦的"海鸥"型过渡，具强烈负Eu异常，δEu值为0.03~0.14；在原始地幔标准化微量元素蛛网图上，明显富集Rb、Th、Nd、Ta等元素，具有明显的Ba、Sr、P、Ti亏损。结合区域地质资料分析，该岩体的形成可能与原特提斯洋俯冲，以及古特提斯洋扩张成盆时，该区处于强烈挤压状态，持续的俯冲使澜沧陆壳残片地壳不断加厚并导致区域重力均衡隆升，引起深部地壳物质在加热后抬升减压发生部分熔融有关。

    The LA-ICP-MS U-Pb dating of the zircon from the Bulangshan granite in the Menghai area of Yunnan Province was carried out. The weighted average age of the granite 206Pb/238U was 458.5±3.0Ma (n=21, MSWD=2.3), suggesting that the Bulangshan granite was not formed in Late Yanshanian period as originally thought, but was produced in Middle-Late Ordovician. The zircon εHf(t) of the samples range from -2.4 to 0.9 with an average of -0.9. The tDMC of the crustal model vary from 1.41Ga to 1.58Ga with a weighted average of 1.49Ga. It is inferred that the original rock was probably the second cloud (quartz) schist. The geochemical characteristics of the rock indicate that the granite has high SiO2 (75.79%~77.56%), high alkali (K2O+Na2O=7.39%~8.42%), medium-high potassium (K2O/Na2O=1.23~1.95), and low MgO (0.14%~0.27%) and CaO(0.05%~0.64%). Aluminum supersaturated index A/CNK values range from 1.02 to 1.27, and the rock is a high-potassium-calcium-alkali-strong over-aluminum S-type granite. The total amount of rare earth elements in the rocks appears to be transition from LREE enrichment to a flat"gull"type, with a strong negative Eu anomaly and δEu values ranging from 0.03 to 0.14. There exists significant enrichment of elements such as Rb, Th, Nd, and Ta and significant loss of Ba, Sr, P, and Ti in the original mantle standard trace element spider pattern. Combined with regional geological data, the authors hold that the formation of the rock mass may be related to the following factors:the subduction of the original Tethys Ocean and the Paleo-Tethys Ocean expanded into basins, the area was under the condition of intense compression, and the continued intracontinental subduction and collision would continuously increase the regional crust and led to regional equilibrium gravity uplift, which caused deep crust materials to migrate upward after heating and decompression and partial melting.

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  • 图 1  研究区地质简图（据参考文献①②修改）

    Figure 1. 

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    图 2  布朗山白云钾长花岗岩野外及镜下特征

    Figure 2. 

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    图 3  布朗山花岗岩锆石阴极发光（CL）图像及打点位置

    Figure 3. 

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    图 4  布朗山花岗岩锆石U-Pb谐和图和年龄加权平均值

    Figure 4. 

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    图 5  布朗山花岗岩t-εHf（t）图解

    Figure 5. 

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    图 6  布朗山花岗岩Rb/Sr-Rb/Ba图解[28]

    Figure 6. 

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    图 7  布朗山花岗岩B-A图解[32]

    Figure 7. 

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    表 1  布朗山花岗岩LA-ICP-MS锆石U-Th-Pb同位素数据

    Table 1.  LA-ICP-MS zircon U-Th-Pb data of Bulangshan granites

    点号 Pb Th U Th/U 同位素比值 同位素年龄/Ma
    10-6 207Pb/206Pb 1σ 207Pb/235U 1σ Pb/U206238 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ
    01 43.2 327 484 0.68 0.0583 0.0015 0.6059 0.0159 0.0748 0.0007 543 53.69 481 10.08 465 4.50
    02 24.4 315 251 1.25 0.0567 0.0016 0.5728 0.0166 0.0729 0.0007 480 64.81 460 10.69 454 4.10
    03 21.9 186 248 0.75 0.0596 0.0019 0.6004 0.0180 0.0729 0.0007 591 68.51 477 11.46 454 4.08
    04 17.2 143 195 0.73 0.0570 0.0017 0.5819 0.0184 0.0736 0.0009 500 66.66 466 11.81 458 5.45
    05 89.7 654 1023 0.64 0.0556 0.0013 0.5605 0.0130 0.0728 0.0006 435 49.07 452 8.49 453 3.80
    06 21.1 201 231 0.87 0.0552 0.0018 0.5636 0.0183 0.0739 0.0007 420 78.69 454 11.86 459 4.14
    07 14.0 129 155 0.83 0.0550 0.0019 0.5525 0.0194 0.0726 0.0008 413 77.77 447 12.66 452 4.62
    08 23.4 237 254 0.93 0.0593 0.0017 0.5969 0.0173 0.0727 0.0007 589 61.1 475 11.02 452 4.10
    09 19.5 135 206 0.66 0.0561 0.0017 0.6109 0.0179 0.0790 0.0009 457 66.66 484 11.27 490 5.11
    10 21.9 182 269 0.68 0.0578 0.0019 0.5505 0.0190 0.0689 0.0010 524 70.36 445 12.42 429 6.28
    11 30.4 279 328 0.85 0.0587 0.0016 0.6062 0.0164 0.0747 0.0007 567 59.25 481 10.39 464 4.11
    12 31.57 240 355 0.68 0.0566 0.0015 0.5871 0.0159 0.0748 0.0008 476 89.80 469 10.19 465 4.73
    13 88.4 840 981 0.86 0.0566 0.0012 0.5683 0.0117 0.0726 0.0006 476 46.29 457 7.595 452 3.50
    14 20.6 228 215 1.06 0.0584 0.0017 0.5956 0.0169 0.0740 0.0008 543 66.65 474 10.78 460 4.74
    15 45.8 378 502 0.75 0.0576 0.0016 0.6072 0.0169 0.0764 0.0009 522 62.96 482 10.70 475 5.62
    16 20.8 163 230 0.71 0.0580 0.0019 0.5993 0.0199 0.0747 0.0007 528 72.21 477 12.67 464 4.10
    17 15.46 131 182 0.72 0.0601 0.0023 0.5804 0.0209 0.0700 0.0007 609 81.47 465 13.41 436 4.44
    18 25.09 269 267 1.00 0.0591 0.0023 0.6162 0.0243 0.0751 0.0010 572 83.32 487 15.30 467 5.71
    19 35.61 249 394 0.63 0.0555 0.0018 0.5956 0.0191 0.0774 0.0008 432 70.36 474 12.18 480 4.79
    20 40.87 234 438 0.53 0.0571 0.0016 0.6525 0.0194 0.0825 0.0010 494 67.59 510 11.94 511 5.93
    21 33.49 255 373 0.68 0.0585 0.0018 0.6087 0.0182 0.0752 0.0007 550 64.80 483 11.48 467 4.39
    22 20.70 186 233 0.80 0.0565 0.0018 0.5655 0.0171 0.0725 0.0006 472 70.36 455 11.12 451 3.86
    23 18.65 190 198 0.96 0.0575 0.0019 0.5925 0.0192 0.0745 0.0008 509 76.84 472 12.23 463 4.56
    24 16.50 152 176 0.86 0.0634 0.0021 0.6567 0.0217 0.0748 0.0007 724 70.36 513 13.32 465 4.07
    25 39.9 467 358 1.30 0.0638 0.0019 0.7196 0.0210 0.0819 0.0010 744 62.19 550 12.40 507 6.21
    26 44.9 415 442 0.94 0.0571 0.0016 0.6293 0.0171 0.0795 0.0006 494 59.26 496 10.64 493 3.84
    27 21.40 172 245 0.70 0.0578 0.0019 0.5804 0.0184 0.0728 0.0007 520 70.36 465 11.82 453 4.09
    28 30.9 139 174 0.80 0.1889 0.0147 3.3627 0.4494 0.1031 0.0041 2733 129.5 1496 104.6 633 23.77
    29 67.7 387 733 0.53 0.0564 0.0012 0.6348 0.0143 0.0811 0.0008 478 50.92 499 8.86 503 4.79
    30 20.16 187 221 0.85 0.0590 0.0019 0.5965 0.0195 0.0730 0.0007 565 70.36 475 12.39 454 4.48
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    表 2  布朗山花岗岩全岩主量、微量和稀土元素测试数据

    Table 2.  Whole-rock major, trace and rare earth element analyses of the Bulangshan granites

    样品号 MBbls-32-1 MBbls-32-1-1 MBbls-32-1-2 MBbls-32-1-3 MBxng-36-1 MBxng-36-1-1 MBxng-36-1-2 样品号 MBbls-32-1 MBbls-32-1-1 MBbls-32-1-2 MBbls-32-1-3 MBxng-36-1 MBxng-36-1-1 MBxng-36-1-2
    SiO2 77.54 76.76 77.56 76.61 77.02 77.25 75.79 Sc 1.82 1.83 1.56 2.78 2.02 1.89 2.23
    TiO2 0.04 0.04 0.04 0.04 0.09 0.08 0.09 Nb 60.20 45.10 47.60 60.20 28.90 26.80 40.00
    Al2O3 12.33 12.60 12.11 12.62 12.17 12.05 12.41 Zr 135.00 55.90 64.80 59.80 29.50 35.30 38.20
    Fe2O3 0.84 0.92 0.71 0.89 0.96 1.02 1.04 Hf 7.14 3.23 3.44 3.38 1.54 1.59 2.09
    FeO 0.70 0.65 0.59 0.68 0.78 0.83 0.89 U 10.00 4.30 6.67 4.46 5.47 4.11 6.98
    MnO 0.02 0.01 0.02 0.02 0.03 0.03 0.03 Th 38.70 37.30 32.90 41.9 25.50 28.20 21.30
    MgO 0.22 0.27 0.25 0.14 0.26 0.25 0.22 La 14.60 20.10 32.10 15.50 20.60 31.20 29.10
    CaO 0.10 0.05 0.11 0.07 0.01 0.11 0.64 Ce 21.90 26.80 45.20 12.50 35.20 59.70 55.70
    Na2O 2.54 3.64 2.56 3.31 3.57 3.39 3.65 Pr 4.28 6.41 9.25 5.27 4.69 6.84 6.50
    K2O 4.95 4.47 4.83 4.58 4.85 4.58 4.67 Nd 16.9 27.00 38.10 22.90 16.70 24.90 24.20
    P2O5 0.01 0.01 0.01 0.01 0.02 0.02 0.02 Sm 4.52 8.46 10.6 7.39 3.43 5.50 5.85
    烧失量 0.91 0.72 1.28 1.18 0.44 0.7 0.94 Eu 0.06 0.08 0.13 0.07 0.15 0.23 0.23
    总计 100.20 100.14 100.07 100.15 100.29 100.31 100.39 Gd 4.66 8.29 10.10 7.52 2.99 5.31 5.56
    A/NK 1.29 1.16 1.28 1.21 1.09 1.14 1.12 Tb 1.13 1.90 2.13 1.84 0.60 1.10 1.25
    A/CNK 1.27 1.15 1.26 1.20 1.08 1.12 1.02 Dy 7.79 11.60 13.10 11.60 3.41 6.43 7.69
    Na2O+K2O 7.49 8.11 7.39 7.89 8.42 7.97 8.32 Ho 1.66 2.39 2.72 2.47 0.67 1.33 1.67
    K2O/ Na2O 1.95 1.23 1.89 1.38 1.36 1.35 1.28 Er 4.77 6.53 7.59 6.86 1.84 3.78 4.82
    CaO/ Na2O 0.04 0.01 0.04 0.02 0.03 0.03 0.18 Tm 0.88 1.18 1.35 1.23 0.33 0.66 0.92
    Cu 2.72 1.89 1.32 2.02 1.87 2.42 8.93 Yb 5.71 7.18 8.29 7.93 2.10 4.03 6.06
    Zn 41.20 40.90 35.50 48.20 31.10 36.00 26.50 Lu 0.80 0.99 1.15 1.03 0.28 0.53 0.84
    Cr 2.07 4.10 7.32 5.47 2.79 2.58 122.00 Y 42.10 60.70 73.50 62.80 15.80 36.60 48.30
    Ni 0.002 0.002 0.30 0.05 0.17 0.69 48.80 ΣREE 131.76 189.61 255.31 166.91 108.80 188.14 198.68
    Co 0.26 0.16 0.16 0.23 0.63 0.66 2.18 δEu 0.04 0.03 0.04 0.03 0.14 0.13 0.12
    Rb 322 264 293 339 202 197 223.00 (La/Yb)N 1.72 1.89 2.61 1.32 6.61 5.22 3.24
    Sr 7.72 4.38 8.13 3.25 9.97 7.37 13.00 (Gd/Yb)N 0.66 0.93 0.98 0.77 1.15 1.06 0.74
    Ba 33.70 25.30 51.30 26.40 164.00 158.00 173.00 (La /Sm)N 2.03 1.49 1.90 1.32 3.78 3.57 3.13
    V 4.23 3.37 2.80 3.15 4.61 4.73 5.10
    注：主量元素含量单位为%，微量和稀土元素含量单位为10-6；A/NK=摩尔Al2O3/(Na2O+K2O)，A/CNK=摩尔Al2O3/(CaO+Na2O+K2O)；δEu=2EuN/(SmN+GdN)，其中N为球粒陨石标准化值
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    表 3  布朗山花岗岩锆石Hf同位素数据

    Table 3.  Zircon Hf isotopic compositions of the Bulangshan granites

    测点号 年龄/Ma 176Hf/177Hf 2σ 176Yb/177Hf 2σ 176Lu/177Hf 2σ (176Hf/177Hf)t εHf(1t) tDM/Ma tDMC/Ma fLu/Hf
    01 465 0.282460 0.000008 0.036197 0.000196 0.001428 0.000009 0.282448 -1.4 1132 1519 -0.96
    02 454 0.282476 0.000008 0.029577 0.000224 0.001135 0.000005 0.282466 -0.7 1101 1478 -0.97
    03 454 0.282429 0.000009 0.020115 0.000126 0.000786 0.000003 0.282422 -2.3 1157 1576 -0.98
    04 458 0.282495 0.000008 0.019454 0.000128 0.000769 0.000004 0.282488 0.1 1064 1429 -0.98
    05 453 0.282460 0.000009 0.031819 0.000139 0.001241 0.000006 0.282449 -1.3 1127 1516 -0.96
    06 459 0.282427 0.000008 0.02309 0.000168 0.000880 0.000005 0.282419 -2.4 1163 1583 -0.97
    07 452 0.282468 0.000009 0.02575 0.000232 0.000994 0.000010 0.282459 -1.0 1109 1494 -0.97
    08 452 0.282457 0.000008 0.019423 0.000847 0.000737 0.000010 0.282451 -1.3 1116 1513 -0.98
    11 464 0.282462 0.000008 0.021789 0.000618 0.000848 0.000004 0.282455 -1.1 1112 1504 -0.97
    12 465 0.282504 0.000010 0.021653 0.000115 0.000875 0.000003 0.282496 0.3 1055 1412 -0.97
    13 452 0.282472 0.000007 0.019145 0.000831 0.000767 0.000003 0.282466 -0.7 1096 1480 -0.98
    14 460 0.282469 0.000008 0.023286 0.000913 0.000914 0.000003 0.282461 -0.9 1104 1489 -0.97
    15 475 0.282526 0.000008 0.039758 0.000499 0.001592 0.000017 0.282512 0.9 1044 1377 -0.95
    16 464 0.282468 0.000009 0.021784 0.000239 0.000867 0.000008 0.282461 -0.9 1104 1490 -0.97
    18 467 0.282478 0.000008 0.023974 0.000177 0.000915 0.000007 0.282470 -0.6 1093 1471 -0.97
    21 467 0.282470 0.000008 0.030781 0.000822 0.001181 0.000035 0.282460 -0.9 1111 1492 -0.96
    22 451 0.282461 0.000008 0.030479 0.000491 0.001167 0.000020 0.282451 -1.3 1124 1513 -0.96
    23 463 0.282492 0.000011 0.03716 0.000416 0.001412 0.000018 0.282480 -0.2 1087 1448 -0.96
    24 465 0.282437 0.000007 0.023064 0.000447 0.000872 0.000002 0.282430 -2.0 1148 1560 -0.97
    27 465 0.282495 0.000009 0.021947 0.000872 0.000877 0.000003 0.282488 0.0 1067 1431 -0.97
    注：εHf（t）=10000×{[（176Hf/177Hf）s -（176Lu/177Hf）s×（eλt-1）]/[ （176Hf/177Hf）CHUR,0-（176Lu/177Hf）CHUR×（eλt-1）]-1},tDM=1/λ×ln{1+ [（176Hf/177Hf）s-（176Hf/177Hf）DM]/[（176Lu/177Hf）s-（176Lu/177Hf）DM]}, tDMC=tDM-(tDM-t)×[(fcc-fs)/(fcc-fDM)], fLu/Hf=（176Lu/177Hf）s/（176Lu/ 177Hf）CHUR-1.其中：λ=1.867×10-11/a;（176Hf/177Hf）s 和（176Hf/177Hf）CHUR=0.0332,（176Hf/177Hf）CHUR,0=0.282772；（176Lu/177Hf）DM= 0.0384，（176Hf/177Hf）DM=0.28325；（176Lu/177Hf）平均地壳=0.015；fcc=[（176Lu/177Hf）平均地壳/（176Lu/177Hf）CHUR]-1；fs=fLu/Hf；fDM=[（176Lu/177Hf）DM/ （176Lu/177Hf）CHUR]-1; t为锆石结晶年龄
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