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藏东吉塘地区早古生代花岗岩锆石U-Pb年龄、Hf同位素及其对原特提斯洋演化的启示

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任飞, 尹福光, 徐波, 刘恒麟, 樊炳良, 徐长昊, 白景国. 藏东吉塘地区早古生代花岗岩锆石U-Pb年龄、Hf同位素及其对原特提斯洋演化的启示[J]. 地质通报, 2021, 40(11): 1865-1876.
引用本文: 任飞, 尹福光, 徐波, 刘恒麟, 樊炳良, 徐长昊, 白景国. 藏东吉塘地区早古生代花岗岩锆石U-Pb年龄、Hf同位素及其对原特提斯洋演化的启示[J]. 地质通报, 2021, 40(11): 1865-1876.
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REN Fei, YIN Fuguang, XU Bo, LIU Henglin, FAN Bingliang, XU Changhao, BAI Jingguo. Zircon U-Pb age and Hf isotope of Early Paleozoic granite from the Jitang area in eastern Tibet and its insight into the evolution of the Proto-Tethys Ocean[J]. Geological Bulletin of China, 2021, 40(11): 1865-1876.
Citation: REN Fei, YIN Fuguang, XU Bo, LIU Henglin, FAN Bingliang, XU Changhao, BAI Jingguo. Zircon U-Pb age and Hf isotope of Early Paleozoic granite from the Jitang area in eastern Tibet and its insight into the evolution of the Proto-Tethys Ocean[J]. Geological Bulletin of China, 2021, 40(11): 1865-1876.
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藏东吉塘地区早古生代花岗岩锆石U-Pb年龄、Hf同位素及其对原特提斯洋演化的启示

  • 1.

    中国地质调查局成都地质调查中心, 四川 成都 610081

  • 2.

    彝良驰宏矿业有限公司, 云南 昭通 657600

  • 3.

    油气藏地质及开发工程国家重点实验室(成都理工大学), 四川 成都 610059

  • 4.

    西藏自治区地质矿产勘查开发局地热地质大队, 西藏 拉萨 850000

  • 5.

    成都理工大学, 四川 成都 610081

  • 6.

    四川省冶金地质勘查院, 四川 成都 610081

  • 基金项目:
    国家自然科学基金项目《特提斯构造域地质构造编图及区域对比研究》（批准号：92055314）和中国地质调查局项目《全国陆域及海区地质图件更新与共享》（编号：DD20190375）、《三江造山带昌都—澜沧地区区域地质调查》（编号：DD20190053）
详细信息
    作者简介: 任飞(1983-), 男, 硕士, 工程师, 从事区域地质和构造研究工作。E-mail: 17605405@qq.com

  • 中图分类号: P534.4;P588.12+1;P597+.3

Zircon U-Pb age and Hf isotope of Early Paleozoic granite from the Jitang area in eastern Tibet and its insight into the evolution of the Proto-Tethys Ocean

  • 1.

    Chengdu Center, China Geological Survey, Chengdu 610081, Sichuan, China

  • 2.

    Yiliang Chihong Mining Co., Ltd., Zhaotong 657600, Yunnan, China

  • 3.

    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China

  • 4.

    Geothermal Geological Survey Party, Tibet Bureau of Geology and Mineral Exploration and Development, Lhasa 850000, Tibet, China

  • 5.

    College of Earth Sciences, Chengdu University of Technology, Chengdu 610081, Sichuan, China

  • 6.

    Sichuan Institute of Metallurgical Geology & Exploration, Chengdu 610081, Sichuan, China

    摘要

  • 以前对藏东吉塘地区的早古生代岩浆事件鲜有报道，在吉塘地区的浪拉山新发现了中—晚奥陶世花岗岩。采用LA-ICP-MS锆石U-Pb测年，获得该花岗岩的206Pb/238U年龄加权平均值为455±2.0 Ma（WSWD=1.15，n=26），属于中—晚奥陶世。岩石地球化学特征表明，该花岗岩具有高SiO2（78.72%~79.48%）、富钾（K2O/Na2O=5.55~10.20），低MgO（0.10%~0.25%）的特征，铝饱和指数A/CNK为1.08~1.26，岩石属于高钾钙碱性强过铝S型花岗岩。岩石稀土元素总体表现为轻稀土元素富集、重稀土元素亏损的特征，具强烈负Eu异常，δEu值为0.35~0.39；在原始地幔标准化微量元素蛛网图上，明显富集Rb、Th、Nd、Pb等元素，亏损Ba、Nb、Sr、P、Ti等元素。结合区域地质资料分析，该岩体是由原特提斯洋俯冲消减引起古老地壳物质部分熔融形成的，是原特提斯洋俯冲消减的岩浆事件响应；说明在中—晚奥陶世吉塘地区存在原特提斯洋的俯冲消减作用。

    There is little report on the Early Paleozoic magmatic events in the Jitang area, eastern Tibet.The Middle-Late Ordovician granites have been discovered in Langla Mountain, Jitang.The weighted average U-Pb age of the granite is 455±2.0 Ma(WSWD=1.15, n=26) by the LA-ICP-MS U-Pb dating of the zircon, indicating that it was emplaced in Middle-Late Ordovician.The geochemical characteristics indicate that the granite has high SiO2(78.72%~79.48%), high potassium(K2O/Na2O=5.55~10.20), low MgO(0.10%~0.25%), with aluminum supersaturated index A/CNK values ranging from 1.08 to 1.26, and the rock is a high-potassium-calcium- alkali-strong over aluminum S-type granite.The REE contents of rocks are enriched in LREE and depleted in HREE, with a negative Eu anomaly and δEu values ranging from 0.35 to 0.39.They are also enriched in LILEs (Rb, Th, Nd and Pb), but depleted in HFSEs (Ba, Nb, Sr, P and Ti).Combined with regional geological data, it is suggested that the granites might have originated from partial melting of ancient crustal materials, caused by the subduction of the Proto-Tethys, and is the response of the magmatic events during subduction of the Proto-Tethys.

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  • 图 1  藏东吉塘—同卡地区地质简图

    Figure 1. 

    下载: 全尺寸图片 幻灯片

    图 2  花岗岩野外露头照片(a)和显微照片(b)

    Figure 2. 

    下载: 全尺寸图片 幻灯片

    图 3  花岗岩锆石阴极发光(CL)图像

    Figure 3. 

    下载: 全尺寸图片 幻灯片

    图 4  花岗岩锆石U-Pb年龄谐和图

    Figure 4. 

    下载: 全尺寸图片 幻灯片

    图 5  花岗岩TAS图解

    Figure 5. 

    下载: 全尺寸图片 幻灯片

    图 6  花岗岩SiO2-K2O图解

    Figure 6. 

    下载: 全尺寸图片 幻灯片

    图 7  花岗岩A/CNK-A/NK图解

    Figure 7. 

    下载: 全尺寸图片 幻灯片

    图 8  花岗岩球粒陨石标准化稀土元素配分模式(a)和原始地幔标准化微量元素蛛网图(b)

    Figure 8. 

    下载: 全尺寸图片 幻灯片

    图 9  花岗岩Rb/Sr-Rb/Ba图解

    Figure 9. 

    下载: 全尺寸图片 幻灯片

    图 10  花岗岩t-εHf(t)图解

    Figure 10. 

    下载: 全尺寸图片 幻灯片

    表 1  花岗岩LA-ICP-MS锆石U-Th-Pb分析结果

    Table 1.  LA-ICP-MS zircon U-Th-Pb dating results of granite

    点号 含量/10-6 Th/U 207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U 206Pb/238U
    Pb Th U 比值 1σ 比值 1σ 比值 1σ 年龄/Ma 1σ 年龄/Ma 1σ 年龄/Ma 1σ
    YX-5GS-01 91.4 292.3 696.1 0.42 0.0577 0.0016 0.5724 0.0154 0.0723 0.0007 516.71 67.58 459.59 9.95 449.77 4.31
    YX-5GS-02 91.5 358.1 485.4 0.74 0.0572 0.0020 0.5685 0.0201 0.0723 0.0009 501.89 71.29 457.05 13.04 450.05 5.57
    YX-5GS-03 429.9 1531.3 2785.1 0.55 0.0573 0.0012 0.5827 0.0126 0.0733 0.0007 505.60 46.29 466.19 8.08 455.92 4.26
    YX-5GS-04 120.5 506.9 572.6 0.89 0.0587 0.0023 0.6050 0.0236 0.0749 0.0009 553.74 87.02 480.43 14.93 465.38 5.52
    YX-5GS-05 440.9 1665.2 2868.6 0.58 0.0599 0.0015 0.5898 0.0144 0.0712 0.0008 598.17 53.69 470.72 9.19 443.32 4.53
    YX-5GS-06 89.4 397.6 418.2 0.95 0.0584 0.0024 0.5882 0.0239 0.0731 0.0010 542.63 90.73 469.69 15.30 454.88 6.03
    YX-5GS-07 183.8 812.4 967.9 0.84 0.0560 0.0018 0.5654 0.0183 0.0726 0.0008 453.75 67.59 455.01 11.90 451.85 4.93
    YX-5GS-08 198.9 849.2 1174.7 0.72 0.0563 0.0016 0.5718 0.0151 0.0733 0.0006 464.86 28.70 459.20 9.73 455.76 3.90
    YX-5GS-09 464.6 1813.1 2925.8 0.62 0.0569 0.0011 0.5779 0.0119 0.0730 0.0006 487.08 44.44 463.10 7.69 453.92 3.66
    YX-5GS-10 81.9 324.9 451.9 0.72 0.0567 0.0023 0.5711 0.0223 0.0733 0.0010 483.38 90.73 458.69 14.42 456.26 5.85
    YX-5GS-11 271.3 1176.2 1472.2 0.80 0.0547 0.0013 0.5607 0.0134 0.0739 0.0008 466.71 53.70 451.98 8.71 459.38 4.56
    YX-5GS-13 41.7 140.8 228.0 0.62 0.0600 0.0034 0.6127 0.0322 0.0751 0.0011 605.58 120.36 485.25 20.30 466.75 6.35
    YX-5GS-14 133.1 539.6 740.7 0.73 0.0568 0.0018 0.5781 0.0180 0.0735 0.0007 483.38 68.51 463.22 11.56 457.31 4.32
    YX-5GS-15 118.1 518.7 594.8 0.87 0.0603 0.0027 0.6175 0.0251 0.0748 0.0008 612.98 96.28 488.25 15.74 465.17 4.95
    YX-5GS-16 77.0 305.1 412.4 0.74 0.0565 0.0022 0.5769 0.0225 0.0740 0.0009 477.82 85.18 462.48 14.49 460.04 5.21
    YX-5GS-17 215.2 985.1 1094.0 0.90 0.0586 0.0017 0.5863 0.0165 0.0729 0.0009 553.74 56.47 468.47 10.56 453.61 5.27
    YX-5GS-18 155.1 640.1 894.0 0.72 0.0561 0.0017 0.5658 0.0176 0.0730 0.0007 453.75 66.66 455.31 11.42 454.27 4.43
    YX-5GS-19 211.7 883.3 1119.1 0.79 0.0589 0.0016 0.5894 0.0165 0.0726 0.0007 564.85 65.73 470.48 10.56 451.85 4.10
    YX-5GS-21 172.2 711.9 970.2 0.73 0.0550 0.0017 0.5568 0.0178 0.0732 0.0007 409.31 68.51 449.44 11.63 455.20 4.21
    YX-5GS-22 74.2 272.2 400.0 0.68 0.0595 0.0024 0.6022 0.0246 0.0738 0.0010 587.07 88.88 478.60 15.60 459.09 5.79
    YX-5GS-23 129.3 456.4 840.4 0.54 0.0554 0.0017 0.5600 0.0168 0.0729 0.0007 431.53 66.66 451.55 10.96 453.76 4.49
    YX-5GS-24 90.8 364.1 486.5 0.75 0.0586 0.0023 0.5941 0.0230 0.0733 0.0009 553.74 78.69 473.48 14.67 456.20 5.71
    YX-5GS-25 353.2 1342.4 2168.1 0.62 0.0562 0.0015 0.5800 0.0154 0.0745 0.0009 461.16 59.25 464.48 9.88 463.44 5.18
    YX-5GS-27 200.2 789.9 1231.5 0.64 0.0547 0.0016 0.5599 0.0165 0.0739 0.0008 466.71 60.18 451.48 10.72 459.51 4.57
    YX-5GS-28 148.7 662.8 791.7 0.84 0.0593 0.0018 0.6068 0.0183 0.0739 0.0007 575.96 66.66 481.52 11.54 459.84 4.38
    YX-5GS-30 138.6 633.6 719.9 0.88 0.0600 0.0018 0.6029 0.0177 0.0726 0.0007 605.58 97.21 479.08 11.24 452.06 4.49
    下载: 导出CSV

    表 2  花岗岩锆石Lu-Hf同位素分析数据

    Table 2.  Zircon Lu-Hf isotope data of granite

    测试点 年龄/Ma 176Hf/177Hf 1σ 176Lu/177Hf 1σ 176Yb/177Hf 1σ εHf(t) 1σ TDM1/Ma TDM2/Ma fLu/Hf
    YX2018-5GS-02 456 0.282460 0.000017 0.002453 0.000085 0.088962 0.002450 -1.8 0.8 1165 1407 -0.93
    YX2018-5GS-03 456 0.282436 0.000008 0.002236 0.000010 0.084752 0.000672 -2.5 0.6 1193 1450 -0.93
    YX2018-5GS-04 456 0.282471 0.000009 0.001853 0.000041 0.068869 0.001328 -1.2 0.6 1129 1374 -0.94
    YX2018-5GS-06 456 0.282441 0.000011 0.002102 0.000041 0.075693 0.000840 -2.3 0.7 1181 1437 -0.94
    YX2018-5GS-07 456 0.282450 0.000011 0.002148 0.000039 0.086728 0.002714 -2.0 0.7 1170 1421 -0.94
    YX2018-5GS-08 456 0.282418 0.000009 0.001261 0.000004 0.047822 0.000273 -2.9 0.6 1187 1469 -0.96
    YX2018-5GS-09 456 0.282424 0.000008 0.001815 0.000003 0.069138 0.000197 -2.8 0.6 1196 1466 -0.95
    YX2018-5GS-10 456 0.282415 0.000010 0.000868 0.000001 0.032192 0.000120 -2.8 0.6 1178 1467 -0.97
    YX2018-5GS-12 456 0.282432 0.000010 0.002054 0.000044 0.078081 0.001551 -2.6 0.7 1192 1453 -0.94
    YX2018-5GS-13 456 0.282421 0.000011 0.000552 0.000006 0.020079 0.000154 -2.5 0.7 1160 1450 -0.98
    YX2018-5GS-16 456 0.282438 0.000008 0.000727 0.000007 0.027462 0.000379 -2.0 0.6 1142 1420 -0.98
    YX2018-5GS-18 456 0.282432 0.000008 0.001011 0.000002 0.038956 0.000094 -2.3 0.6 1159 1437 -0.97
    YX2018-5GS-21 456 0.282412 0.000009 0.001064 0.000006 0.041036 0.000369 -3.0 0.6 1190 1477 -0.97
    YX2018-5GS-22 456 0.282421 0.000010 0.000784 0.000002 0.029737 0.000081 -2.6 0.6 1168 1455 -0.98
    YX2018-5GS-25 456 0.282408 0.000009 0.001762 0.000012 0.069045 0.000549 -3.4 0.6 1218 1497 -0.95
    YX2018-5GS-29 456 0.282406 0.000008 0.000563 0.000007 0.021216 0.000229 -3.1 0.6 1182 1480 -0.98
    YX2018-5GS-30 456 0.282383 0.000011 0.000992 0.000002 0.038857 0.000093 -4.0 0.7 1227 1532 -0.97
    下载: 导出CSV

    表 3  花岗岩主量、微量和稀土元素分析结果

    Table 3.  Major, trace elements and REE analytical resultes of granite

    样品编号 YX-5H1 YX-5H2 YX-5H3 样品编号 YX-5H1 YX-5H2 YX-5H3
    SiO2 78.33 78.72 79.48 Ag 0.14 0.17 0.14
    Al2O3 11.86 11.43 11.37 Cd 0.67 0.07 0.07
    Fe2O3 0.76 0.34 0.21 In 0.04 0.02 0.01
    MgO 0.25 0.13 0.10 Sn 2.85 2.16 1.69
    CaO 0.20 0.17 0.16 Sb 0.30 0.36 0.35
    Na2O 1.18 0.81 0.90 Cs 2.62 1.83 1.98
    K2O 6.55 8.27 7.56 Ba 691.00 911.00 852.00
    MnO 0.01 0.01 0.01 La 63.2 27.8 36.4
    P2O5 0.04 0.04 0.04 Ce 128.00 51.3 73.1
    TiO2 0.30 0.26 0.23 Pr 13.9 5.62 7.95
    烧失量 1.10 0.75 0.82 Nd 48.5 19.6 27.7
    总计 100.58 100.93 100.87 Sm 8.35 3.33 4.72
    Na2O+K2O 7.77 9.06 8.46 Eu 0.87 0.41 0.55
    A/CNK 1.26 1.08 1.14 Gd 6.91 3.03 4.14
    K2O/Na2O 5.55 10.21 8.40 Tb 1.05 0.49 0.65
    Li 2.31 1.10 1.30 Dy 6.02 3.09 3.79
    Be 1.20 0.75 0.62 Ho 1.21 0.65 0.76
    Sc 5.32 4.25 3.62 Er 3.31 1.82 2.04
    V 11.0 8.61 8.20 Tm 0.45 0.26 0.28
    Cr 2.13 3.93 3.61 Yb 2.80 1.67 1.74
    Co 0.54 0.60 0.84 Lu 0.41 0.25 0.25
    Ni 1.48 2.35 3.41 Hf 4.02 3.51 3.28
    Cu 1.24 1.60 1.80 Ta 0.65 0.58 0.50
    Zn 66.1 10.5 10.3 W 1.68 2.36 0.78
    Ga 14.0 10.5 10.1 Tl 0.72 0.93 0.93
    Ge 1.16 0.84 0.81 Pb 9.97 10.3 17.4
    As 0.94 1.58 2.68 Bi 0.04 0.04 0.13
    Rb 309.00 352.00 339.00 Th 20.8 15.6 13.8
    Sr 36.5 43.5 46.6 U 1.74 1.37 1.36
    Y 35.7 19.2 21.9 ΣREE 284.98 119.31 164.06
    Zr 127.00 112.00 104.00 LREE 262.82 108.06 150.42
    Nb 6.12 5.09 4.77 HREE 22.16 11.25 13.64
    Mo 0.26 0.19 0.26 LREE/HREE 11.86 9.60 11.03
    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/CNK=摩尔Al2O3/(CaO+Na2O+K2O)；δEu=EuN/[1/2(SmN+GdN)]；(La/Yb)N=LaN/YbN；(Gd/Yb)N=GdN/YbN
    下载: 导出CSV
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