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南澜沧江构造带景洪怕冷岩体锆石U-Pb年龄、Lu-Hf同位素特征及其对古特提斯构造演化的约束

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文章导航 > 地质通报 > 2021 > 40(7): 1068-1083

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王伟, 孙载波, 周坤, 刘和松, 吴嘉林, 丛峰, 赵江泰, 刘卫东, 李小军, 刘梦琼. 南澜沧江构造带景洪怕冷岩体锆石U-Pb年龄、Lu-Hf同位素特征及其对古特提斯构造演化的约束[J]. 地质通报, 2021, 40(7): 1068-1083.
引用本文: 王伟, 孙载波, 周坤, 刘和松, 吴嘉林, 丛峰, 赵江泰, 刘卫东, 李小军, 刘梦琼. 南澜沧江构造带景洪怕冷岩体锆石U-Pb年龄、Lu-Hf同位素特征及其对古特提斯构造演化的约束[J]. 地质通报, 2021, 40(7): 1068-1083.
shu
WANG Wei, SUN Zaibo, ZHOU Kun, LIU Hesong, WU Jialin, CONG Feng, ZHAO Jiangtai, LIU Weidong, LI Xiaojun, LIU Mengqiong. Zircon U-Pb geochronology and Lu-Hf isotope of the Jinghong Paleng pluton in southern Lancangjiang tectonic belt, and its constraints on the tectonic evolution of the Paleo-Tethys[J]. Geological Bulletin of China, 2021, 40(7): 1068-1083.
Citation: WANG Wei, SUN Zaibo, ZHOU Kun, LIU Hesong, WU Jialin, CONG Feng, ZHAO Jiangtai, LIU Weidong, LI Xiaojun, LIU Mengqiong. Zircon U-Pb geochronology and Lu-Hf isotope of the Jinghong Paleng pluton in southern Lancangjiang tectonic belt, and its constraints on the tectonic evolution of the Paleo-Tethys[J]. Geological Bulletin of China, 2021, 40(7): 1068-1083.
shu

南澜沧江构造带景洪怕冷岩体锆石U-Pb年龄、Lu-Hf同位素特征及其对古特提斯构造演化的约束

  • 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.

    云南大学地球科学学院, 云南 昆明 650500

  • 4.

    中国地质调查局成都地质调查中心, 四川 成都 610081

  • 5.

    云南省建筑工程设计院有限公司, 云南 昆明 650217

  • 基金项目:
    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》子项目《云南省系列地质图件数据处理与洋板块地质研究》(编号：DD20190370)、国家自然科学基金项目《三江南段景洪大勐龙地区高压变质岩p-T-t轨迹及其对原-古特提斯构造演化的制约》(批准号：42062005)、云南省自然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)
详细信息
    作者简介: 王伟(1970-), 男, 教授级高工, 从事区域地质调查与微体古生物研究工作。E-mail: 1553974947@qq.com
    通讯作者: 孙载波(1981-), 男, 硕士, 高级工程师, 从事区域地质调查与基础地质研究工作。E-mail: ynddyszb@163.com

  • 中图分类号: P597

Zircon U-Pb geochronology and Lu-Hf isotope of the Jinghong Paleng pluton in southern Lancangjiang tectonic belt, and its constraints on the tectonic evolution of the Paleo-Tethys

  • 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.

    School of Earth Sciences, Yunnan University, Kunming 650500, Yunnan, China

  • 4.

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

  • 5.

    Yunnan Archtectural Engineering Design Compang Limited, Kunming 650217, Yunnan, China

More Information

    摘要

  • 景洪怕冷岩体位于景洪市大勐龙镇西侧，该岩体以闪长岩为主，内部包裹了辉长岩、角闪岩、辉石岩、角闪橄榄岩等小型岩体。利用LA-ICP-MS锆石U-Pb法对怕冷岩体中的辉长岩、黑云英云闪长岩和斜长角闪岩进行精确定年，获得其结晶年龄分别为252.5±1.6 Ma、264.3±2.0 Ma和273.6±1.9 Ma，表明该岩体的形成时代为中—晚二叠世。与该构造带上的其他岩体相比，形成时代较晚，可能为洋盆俯冲晚期岩浆流动分异作用较弱形成。全岩主量和微量元素研究表明，闪长岩和辉长岩均具有典型岛弧岩浆岩的地球化学特征，指示该岩体形成于与板块俯冲有关的大洋岛弧环境。斜长角闪岩锆石初始(176Hf/177Hf)i值为0.282833~0.282858，对应的εHf(t)变化范围在8.8~13.2之间，单阶段亏损地幔Hf模式年龄tDM1为370~549 Ma (平均值为470 Ma)，明显老于原岩结晶时代。结合区域地质资料分析，滇西地区古特提斯洋(昌宁-孟连洋)的俯冲于晚石炭世开始，直到晚二叠世末期洋盆才闭合进入弧陆碰撞造山阶段。

    Outcropped in the western Damenglong Town of Jinghong City, the Paleng pluton is lithologically dominated by diorite in which several small gabbro, amphibolite, pyroxenite and hornblende peridotite plutons are emplaced. By means of LA-ICP-MS zircon U-Pb method, gabbro, tonalite and amphibolite in the Paleng pluton were dated, and yielded crystallization age of 252.5±1.6 Ma, 264.3±2.0 Ma and 273.6±1.9 Ma, respectively, which indicates that the Paleng pluton was emplaced in Middle-Late Permian. Compared with other plutons along this tectonic belt, it was emplaced relatively late, and might be formed from weaker differentiation in the late stage of ocean basin subduction. The study of whole rock major and trace elements shows that both the diorite and gabbro have the geochemical characteristics of typical island-arc magmatism, indicating that the pluton was formed in the oceanic island arc environment related to plate subduction. The initial Hf isotope ratios(176Hf/177Hf)i of the zircons from amphibolites range from 0.282833 to 0.282858, with corresponding εHf(t) values of 8.8~13.2. These zircons have depleted mantle Hf model ages(tDM1) of 416~499 Ma, with an average of 470 Ma, obviously older than the crystallization of the original rocks(273.6 Ma). Combined with the analysis of regional geological data, the subduction of the ancient Tethys Ocean(Changning-Menglian Ocean) in western Yunnan began in the Late Carboniferous, and the ocean basin closed and entered the arc-continent collision orogenic stage until the end of the Late Permian.

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  • 图 1  景洪市大勐龙地区地质简图(底图据参考文献③)

    Figure 1. 

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    图 2  怕冷岩体变质辉长岩、斜长角闪岩野外露头照片(a、c)及显微镜下照片(b、d)

    Figure 2. 

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    图 3  景洪怕冷岩体基性岩Zr/TiO2-Nb/Y(a)、SiO2-Nb/Y(b)(底图据参考文献[20])、SiO2-(Na2O+K2O)(c)和SiO2-K2O(d)判别图解

    Figure 3. 

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    图 4  景洪怕冷岩体基性岩球粒陨石标准化稀土元素配分模式图(a)和原始地幔标准化微量元素蛛网图(b)(球粒陨石和原始地幔标准值据参考文献[26][27])

    Figure 4. 

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    图 5  样品锆石阴极发光(CL)图像和U-Pb年龄谐和图

    Figure 5. 

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    图 6  斜长角闪岩(D3507-1)锆石t-εHf(t)图解(a)和亏损地幔Hf模式年龄tDM1频数直方图(b)

    Figure 6. 

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    图 7  景洪怕冷岩体基性岩Hf/3-Th-Ta(a)和Hf/3-Th-Nb/16(b)构造环境判别图解[36]

    Figure 7. 

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    表 1  景洪怕冷岩体基性岩主量、微量和稀土元素组成

    Table 1.  Major, trace element and REE compositions for the basites from the Paleng pluton in the Jinghong area

    样品号 DMbp-16 -1 DMbp-16 -1-3 DMbw-29 -2 DMbw-29 -2-1 MSB-14 -1-1 MSB-14 -2-1 PM003-62 -1
    SiO2 50.59 49.92 48.80 53.23 52.77 50.36 45.48
    TiO2 0.96 0.67 0.52 0.51 0.58 0.78 0.55
    Al2O3 19.01 18.97 17.03 16.59 17.70 17.44 20.09
    Fe2O3 3.35 0.62 0.50 0.84 1.25 0.98 1.50
    FeO 4.30 7.15 8.61 7.43 7.18 8.56 6.44
    MnO 0.15 0.14 0.18 0.19 0.19 0.20 0.14
    MgO 5.63 5.63 9.87 6.36 4.98 6.53 8.34
    CaO 8.59 8.91 7.27 9.16 8.72 8.59 8.69
    Na2O 3.53 3.49 2.95 3.93 4.35 3.45 1.10
    K2O 0.54 0.54 0.31 0.32 0.22 0.38 1.61
    P2O5 0.13 0.21 0.08 0.08 0.11 0.08 0.03
    烧失量 2.29 2.98 2.47 0.09 0.73 1.29 4.81
    合计 99.07 99.23 98.59 98.73 98.78 98.64 98.78
    Mg# 66.03 58.58 67.31 60.59 55.47 57.81 69.94
    Na2O+ K2O 3.87 4.03 3.26 4.25 4.57 3.83 2.71
    Na2O/K2O 6.54 6.46 9.52 12.28 19.77 9.08 0.68
    Cu 39.00 16.30 2.90 6.42 8.57 6.99 50.30
    Zn 75.40 82.50 48.30 41.90 134.00 88.60 78.00
    Cr 111.00 90.30 507.00 346.00 165.00 81.50 364.00
    Ni 50.40 44.40 141.00 62.00 32.00 5.39 56.50
    Co 31.30 31.80 37.90 25.20 28.10 23.20 36.80
    Rb 27.20 29.00 13.00 12.70 8.31 14.30 130.00
    Sr 524.00 412.00 208.00 299.00 512.00 220.00 299.00
    Ba 96.20 67.60 81.40 62.50 66.10 99.80 0.39
    V 255.00 167.00 244.00 217.00 261.00 153.00 218.00
    Sc 29.00 33.80 38.80 35.30 35.10 37.90 49.60
    Nb 2.38 1.48 1.55 1.94 2.73 1.63 0.60
    Zr 12.00 9.17 8.62 13.20 11.30 8.27 11.60
    Hf 0.53 0.40 0.41 0.60 0.68 0.47 0.56
    U 0.06 0.12 0.14 0.20 0.94 0.42 4.38
    Th 0.12 0.17 0.54 0.63 2.65 0.61 0.58
    La 5.74 4.67 3.14 4.24 12.30 3.16 3.22
    Ce 11.40 9.65 6.76 8.67 24.40 6.76 5.34
    Pr 1.64 1.34 1.00 1.16 3.11 1.01 1.06
    Nd 7.96 6.38 4.94 5.51 13.00 5.01 5.52
    Sm 2.04 1.59 1.37 1.49 2.89 1.48 1.71
    Eu 0.87 0.73 0.40 0.42 0.87 0.51 0.57
    Gd 2.11 1.67 1.62 1.65 2.75 1.74 1.34
    Tb 0.42 0.34 0.37 0.38 0.52 0.40 0.35
    Dy 2.51 1.99 2.32 2.50 3.01 2.67 2.44
    Ho 0.52 0.41 0.53 0.55 0.63 0.59 0.50
    Er 1.43 1.11 1.47 1.56 1.79 1.63 1.18
    Tm 0.25 0.19 0.25 0.28 0.34 0.29 0.23
    Yb 1.66 1.17 1.61 1.70 2.22 1.76 1.34
    Lu 0.24 0.17 0.22 0.23 0.34 0.25 0.18
    Y 13.90 10.30 13.60 14.70 17.30 15.10 13.10
    ΣREE 52.69 41.71 39.60 45.04 85.47 42.36 38.08
    δEu 1.27 1.36 0.82 0.82 0.93 0.97 1.11
    δCe 0.88 0.92 0.91 0.93 0.93 0.91 0.69
    (La/Yb)N 2.33 2.69 1.31 1.68 3.74 1.21 1.62
    (Gd/Yb)N 1.03 1.15 0.81 0.78 1.00 0.80 0.81
    (La/Sm)N 1.77 1.85 1.44 1.79 2.68 1.34 1.18
    注：主量元素含量单位为%，微量元素和稀土元素含量单位为10-6；Mg#=100×Mg/(Mg+Fe)(原子数)；δEu=2EuN/(SmN+GdN)，δCe=2CeN/(LaN+ PrN)，其中N为球粒陨石标准化值
    下载: 导出CSV

    表 2  景洪怕冷岩体锆石LA-ICP-MS U-Th-Pb同位素数据

    Table 2.  LA-ICP-MS zircon U-Th-Pb dating data of the Paleng pluton in the Jinghong area

    点号 元素/10-6 Th/U 同位素比值 同位素年龄/Ma
    Pb Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ
    PM003-62-1变质辉长岩
    01 219 540 98.3 5.49 0.0513 0.0025 0.2868 0.0137 0.0404 0.0005 257 109.2 256 10.8 255 3.2
    02 237 586 118 4.97 0.0483 0.0023 0.2625 0.0121 0.0397 0.0005 122 111.1 237 9.8 251 3.1
    03 179 451 102 4.42 0.0502 0.0025 0.2718 0.0130 0.0396 0.0005 211 117.6 244 10.4 250 3.3
    04 263 634 128 4.95 0.0509 0.0024 0.2794 0.0130 0.0400 0.0005 235 109.2 250 10.3 253 3.1
    05 190 474 95.4 4.97 0.0555 0.0034 0.3073 0.0218 0.0395 0.0006 435 132.4 272 17.0 250 3.6
    06 152 314 90.9 3.46 0.0542 0.0028 0.2988 0.0148 0.0400 0.0005 389 119.4 265 11.6 253 3.2
    07 224 568 127 4.47 0.0509 0.0024 0.2840 0.0131 0.0404 0.0005 235 109.2 254 10.3 256 2.9
    08 357 889 177 5.02 0.0525 0.0020 0.2950 0.0105 0.0408 0.0004 309 85.2 262 8.2 258 2.6
    09 184 452 111 4.08 0.0496 0.0025 0.2804 0.0138 0.0415 0.0007 176 125.0 251 10.9 262 4.3
    10 297 714 147 4.85 0.0475 0.0021 0.2644 0.0121 0.0404 0.0005 76.0 113.0 238 9.7 255 3.3
    11 245 635 160 3.96 0.0472 0.0020 0.2642 0.0111 0.0405 0.0005 61.2 105.5 238 8.9 256 2.8
    12 175 439 109 4.02 0.0461 0.0022 0.2635 0.0126 0.0412 0.0004 400 -278 238 10.2 260 2.8
    13 214 536 151 3.55 0.0494 0.0023 0.2726 0.0122 0.0402 0.0005 165 109.2 245 9.8 254 2.9
    14 168 418 121 3.44 0.0479 0.0024 0.2595 0.0121 0.0396 0.0004 100 105.5 234 9.8 250 2.7
    15 159 401 114 3.51 0.0466 0.0026 0.2514 0.0127 0.0396 0.0006 33.4 120.4 228 10.3 250 3.5
    16 273 685 190 3.60 0.0527 0.0021 0.2886 0.0114 0.0396 0.0004 317 116.7 257 9.0 250 2.7
    17 142 370 107 3.45 0.0533 0.0026 0.2914 0.0141 0.0401 0.0006 343 108.3 260 11.1 253 3.5
    18 155 386 108 3.59 0.0515 0.0028 0.2732 0.0140 0.0388 0.0006 261 128.7 245 11.1 245 3.7
    19 137 354 117 3.04 0.0518 0.0026 0.2774 0.0139 0.0391 0.0005 276 116.7 249 11.0 247 2.9
    20 181 470 161 2.92 0.0483 0.0021 0.2640 0.0113 0.0396 0.0005 122 101.8 238 9.1 250 2.8
    21 181 463 148 3.14 0.0569 0.0029 0.3048 0.0162 0.0387 0.0005 487 111.1 270 12.6 245 3.2
    22 104 270 105 2.58 0.0490 0.0031 0.2691 0.0162 0.0401 0.0005 146 140.7 242 13.0 254 3.4
    23 196 526 164 3.20 0.0505 0.0021 0.2751 0.0113 0.0395 0.0004 217 94.4 247 9.0 250 2.8
    24 194 539 150 3.59 0.0518 0.0023 0.2794 0.0129 0.0389 0.0005 276 101.8 250 10.3 246 2.9
    25 120 305 125 2.45 0.0537 0.0026 0.3038 0.0145 0.0412 0.0005 367 104.6 269 11.3 260 3.3
    26 127 296 130 2.28 0.0569 0.0026 0.3153 0.0147 0.0400 0.0005 487 100.0 278 11.3 253 3.0
    27 126 333 135 2.47 0.0538 0.0025 0.2903 0.0128 0.0394 0.0005 361 101.8 259 10.1 249 3.1
    28 137 378 135 2.81 0.0531 0.0027 0.2833 0.0135 0.0391 0.0005 345 119.4 253 10.7 247 3.0
    29 145 389 136 2.86 0.0516 0.0025 0.2926 0.0145 0.0410 0.0005 333 111.1 261 11.4 259 3.4
    30 119 315 122 2.59 0.0493 0.0027 0.2718 0.0137 0.0405 0.0006 167 125.0 244 11.0 256 3.4
    DMbw-29-4黑云英云闪长岩
    01 15.6 207 307 0.67 0.0536 0.0021 0.3154 0.0125 0.0427 0.0004 354 90.7 278 9.7 269 2.7
    02 11.1 120 232 0.52 0.0554 0.0026 0.3170 0.0144 0.0417 0.0005 432 105.5 280 11.1 263 3.1
    03 14.1 183 285 0.64 0.0539 0.0019 0.3110 0.0109 0.0420 0.0005 365 79.6 275 8.5 265 3.0
    04 11.6 123 245 0.50 0.0558 0.0023 0.3144 0.0126 0.0411 0.0004 443 92.6 278 9.7 259 2.6
    05 18.9 262 380 0.69 0.0514 0.0019 0.2948 0.0109 0.0416 0.0004 257 87.0 262 8.6 263 2.6
    06 4.9 44.5 105 0.42 0.0510 0.0039 0.2827 0.0190 0.0407 0.0006 243 174.1 253 15.1 257 3.8
    07 20.5 238 428 0.56 0.0506 0.0018 0.2879 0.0097 0.0414 0.0004 220 50.9 257 7.6 262 2.3
    08 10.9 111 230 0.48 0.0561 0.0022 0.3206 0.0126 0.0416 0.0004 457 88.9 282 9.7 262 2.6
    09 12.4 146 258 0.57 0.0549 0.0026 0.3143 0.0138 0.0422 0.0005 406 105.5 278 10.7 267 3.2
    10 7.6 92.3 161 0.57 0.0506 0.0027 0.2845 0.0155 0.0407 0.0006 220 119.4 254 12.2 257 3.6
    12 12.6 152 251 0.61 0.0575 0.0025 0.3379 0.0155 0.0425 0.0005 522 96.3 296 11.8 268 3.1
    13 10.4 141 206 0.69 0.0570 0.0029 0.3324 0.0174 0.0425 0.0005 500 119.4 291 13.2 268 3.2
    14 11.9 135 242 0.56 0.0525 0.0022 0.3070 0.0127 0.0426 0.0004 309 94.4 272 9.9 269 2.7
    15 8.7 102 176 0.58 0.0482 0.0024 0.2819 0.0142 0.0424 0.0005 109 111.1 252 11.2 268 3.2
    16 7.4 86.3 150 0.58 0.0497 0.0025 0.2878 0.0141 0.0425 0.0006 183 118.5 257 11.1 268 3.7
    17 14.8 192 303 0.63 0.0532 0.0021 0.3021 0.0112 0.0414 0.0004 339 91.7 268 8.7 262 2.4
    18 9.2 112 187 0.60 0.0497 0.0025 0.2864 0.0135 0.0421 0.0005 183 116.7 256 10.7 266 2.9
    19 15.1 167 317 0.53 0.0523 0.0018 0.2918 0.0099 0.0407 0.0004 298 81.5 260 7.8 257 2.5
    20 8.3 81.9 176 0.47 0.0479 0.0021 0.2710 0.0118 0.0412 0.0005 94.5 103.7 243 9.4 260 3.0
    21 16.2 202 325 0.62 0.0560 0.0019 0.3182 0.0108 0.0413 0.0004 450 77.8 280 8.3 261 2.4
    22 13.3 170 272 0.62 0.0510 0.0021 0.2867 0.0121 0.0408 0.0004 239 96.3 256 9.5 258 2.5
    23 15.5 223 312 0.71 0.0502 0.0020 0.2842 0.0118 0.0409 0.0004 206 94.4 254 9.3 258 2.3
    24 11.1 140 219 0.64 0.0523 0.0021 0.3030 0.0114 0.0422 0.0005 298 88.0 269 8.9 267 3.1
    25 10.4 128 210 0.61 0.0525 0.0021 0.2992 0.0122 0.0413 0.0005 306 94.4 266 9.5 261 2.9
    26 11.8 157 239 0.66 0.0513 0.0023 0.2898 0.0134 0.0407 0.0004 254 110.2 258 10.5 257 2.6
    27 13.3 148 273 0.54 0.0527 0.0019 0.3037 0.0111 0.0418 0.0005 322 85.2 269 8.6 264 2.9
    28 10.6 125 219 0.57 0.0499 0.0025 0.2807 0.0133 0.0411 0.0005 191 112.0 251 10.6 260 3.0
    29 17.4 190 353 0.54 0.0514 0.0017 0.3015 0.0104 0.0423 0.0004 261 77.8 268 8.1 267 2.6
    30 14.8 179 306 0.59 0.0522 0.0019 0.2974 0.0104 0.0412 0.0004 295 81.5 264 8.2 261 2.6
    MSB-14-1斜长角闪岩
    01 21.39 340 393 0.87 0.0536 0.0022 0.3325 0.0141 0.0448 0.0006 354 99.1 291 10.7 283 3.7
    02 22.77 334 428 0.78 0.0489 0.0023 0.2951 0.0139 0.0437 0.0006 139 111.1 263 10.9 276 3.6
    03 20.77 217 415 0.52 0.0560 0.0021 0.3371 0.0129 0.0435 0.0005 454 117.6 295 9.8 275 3.1
    04 6.36 35.0 137 0.26 0.0527 0.0039 0.3144 0.0195 0.0441 0.0008 322 137.9 278 15.0 278 5.0
    05 4.84 32.4 102 0.32 0.0565 0.0040 0.3317 0.0204 0.0435 0.0008 472 163.9 291 15.5 275 5.0
    06 12.23 140 261 0.54 0.0536 0.0029 0.2973 0.0154 0.0403 0.0006 354 125.0 264 12.1 254 3.9
    07 8.72 60.7 181 0.33 0.0546 0.0032 0.3247 0.0180 0.0437 0.0007 398 131.5 286 13.8 276 4.6
    08 7.07 67.7 142 0.48 0.0492 0.0038 0.2857 0.0194 0.0431 0.0007 167 161.1 255 15.3 272 4.5
    09 18.31 250 353 0.71 0.0502 0.0024 0.2965 0.0134 0.0432 0.0006 211 117.6 264 10.5 273 3.7
    10 14.96 106 312 0.34 0.0568 0.0027 0.3416 0.0155 0.0436 0.0006 483 103.7 298 11.8 275 3.5
    11 23.25 397 430 0.92 0.0534 0.0022 0.3175 0.0131 0.0430 0.0005 343 89.8 280 10.1 272 3.3
    12 29.3 447 537 0.83 0.0525 0.0021 0.3184 0.0120 0.0441 0.0006 306 88.9 281 9.2 278 3.4
    13 25.9 413 483 0.86 0.0522 0.0019 0.3119 0.0113 0.0430 0.0004 300 81.5 276 8.8 272 2.8
    14 13.13 124 263 0.47 0.0528 0.0026 0.3167 0.0147 0.0437 0.0006 320 113.0 279 11.3 276 3.8
    15 24.51 263 492 0.54 0.0521 0.0022 0.3169 0.0131 0.0439 0.0006 300 94.4 280 10.1 277 3.5
    16 12.65 176 248 0.71 0.0516 0.0026 0.3039 0.0151 0.0423 0.0005 333 119.4 269 11.7 267 3.3
    17 7.99 91.7 157 0.58 0.0526 0.0036 0.3193 0.0208 0.0440 0.0007 322 155.5 281 16.0 278 4.2
    18 12.83 121 261 0.46 0.0533 0.0028 0.3228 0.0156 0.0440 0.0006 343 118.5 284 12.0 278 3.6
    20 28.92 336 588 0.57 0.0523 0.0020 0.3097 0.0119 0.0426 0.0005 298 87.0 274 9.2 269 3.0
    21 7.19 70.5 143 0.49 0.0531 0.0033 0.3180 0.0168 0.0438 0.0008 332 144.4 280 12.9 276 4.7
    22 7.73 79.3 156 0.51 0.0552 0.0035 0.3234 0.0183 0.0431 0.0007 420 147.2 284 14.0 272 4.1
    23 22.95 249 460 0.54 0.0509 0.0021 0.3040 0.0122 0.0431 0.0006 239 94.4 270 9.5 272 3.5
    24 6.69 69.3 132 0.52 0.0551 0.0041 0.3352 0.0228 0.0438 0.0008 413 166.7 293 17.3 277 4.9
    下载: 导出CSV

    表 3  斜长角闪岩(D3507-1)锆石Hf同位素数据

    Table 3.  Zircon Hf isotopic compositions of the amphibolite sample(D3507-1)

    测点号 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 2σ εHf(0) εHf(t) tDM /Ma tDMC/Ma fLu/Hf
    01 0.044439 0.002098 0.282917 0.000030 4.7 10.4 488 607 -0.94
    02 0.023963 0.001226 0.282926 0.000027 5.0 10.8 465 578 -0.96
    03 0.027106 0.001363 0.282993 0.000030 7.4 13.2 370 426 -0.96
    04 0.010873 0.000602 0.282956 0.000026 6.1 12.0 415 501 -0.98
    05 0.003159 0.000178 0.282922 0.000022 4.8 10.9 458 575 -0.99
    06 0.022416 0.001131 0.282883 0.000025 3.4 9.3 526 675 -0.97
    07 0.017125 0.000926 0.282889 0.000023 3.7 9.6 513 657 -0.97
    08 0.029747 0.001493 0.282925 0.000027 5.0 10.8 469 582 -0.96
    09 0.035089 0.001686 0.282912 0.000031 4.5 10.3 490 614 -0.95
    10 0.013654 0.000742 0.282909 0.000020 4.4 10.3 483 610 -0.98
    11 0.039804 0.001947 0.282871 0.000031 3.0 8.8 554 711 -0.94
    12 0.042567 0.002038 0.282933 0.000030 5.2 11.0 465 571 -0.94
    13 0.020519 0.001069 0.282870 0.000027 3.0 8.9 542 702 -0.97
    14 0.032379 0.001575 0.282871 0.000030 3.0 8.8 549 707 -0.95
    15 0.036359 0.001788 0.282939 0.000030 5.4 11.2 454 555 -0.95
    16 0.039328 0.001953 0.282957 0.000030 6.1 11.8 429 515 -0.94
    17 0.027146 0.001356 0.282940 0.000026 5.5 11.3 446 547 -0.96
    18 0.018016 0.000959 0.282942 0.000027 5.5 11.5 439 539 -0.97
    19 0.016588 0.000870 0.282976 0.000026 6.7 12.7 390 460 -0.97
    20 0.015335 0.000775 0.282930 0.000021 5.1 11.1 454 564 -0.98
    注：εHf(t)=10000×{[(176 Hf/177Hf)s－(176 Lu/177Hf)s×(eλt-1)]/[(176 Hf/177Hf)CHUR, 0-(176 Lu/177Hf)CHUR ×(eλt-1)]-1}, tDM=1/λ×ln{1+[(176 Hf/177Hf)s－(176 Hf/177Hf)DM]/[(176 Lu/177Hf)s－(176 Lu/177Hf)DM]}, tDMC=tDM-(tDM-t) ×[(fcc-fs)/(fcc-fDM)]，fLu/Hf=(176 Lu/177Hf)s/(176 Lu/177Hf)CHUR-1，其中：λ=1.867×10-11/a; (176 Hf/177Hf)s和(176 Hf/177Hf)S为样品测量值；(176 Lu/177Hf)CHUR=0.0332；(176 Hf/177Hf)CHUR, 0=0.282772；(176 Lu/177Hf)DM=0.0384，(176 Hf/177Hf)DM=0.28325；(176 Lu/177Hf)平均地壳=0.015；fcc=[(176Lu/177Hf)平均地壳/(176 Lu/177Hf)CHUR]-1；fs= fLu/Hf；fDM=[(176 Lu/177Hf)DM/(176 Lu/177Hf)CHUR]-1;t为锆石结晶年龄
    下载: 导出CSV
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    云南省地质调查院. 1: 250 000澜沧县、勐海县区域地质调查报告. 2012.

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    云南省地质调查院. 1: 50 000曼各、小街、曼班、大勐龙、万纳兰、勐宋坝幅区域地质调查报告. 2020.

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    云南省地质调查院. 1: 50 000半坡、大山、谦六、芒蚌街、丫口街、官房幅区域地质调查报告. 2014.

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收稿日期:  2019-11-10
修回日期:  2020-04-09
刊出日期:  2021-07-15

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