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    滇东南建水地区高镁火山岩包体的成因和构造背景

    刘德民 郭宏杰 张根袁 孔令昊 邵俊琦 张婧琪

    刘德民, 郭宏杰, 张根袁, 孔令昊, 邵俊琦, 张婧琪, 2019. 滇东南建水地区高镁火山岩包体的成因和构造背景. 地球科学, 44(5): 1749-1760. doi: 10.3799/dqkx.2019.078
    引用本文: 刘德民, 郭宏杰, 张根袁, 孔令昊, 邵俊琦, 张婧琪, 2019. 滇东南建水地区高镁火山岩包体的成因和构造背景. 地球科学, 44(5): 1749-1760. doi: 10.3799/dqkx.2019.078
    Liu Demin, Guo Hongjie, Zhang Genyuan, Kong Linghao, Shao Junqi, Zhang Jinqi, 2019. Petrogenesis and Tectonic Setting of High-Mg Volcanic Rock Xenoliths in Jianshui Area, Southeast Yunnan, China. Earth Science, 44(5): 1749-1760. doi: 10.3799/dqkx.2019.078
    Citation: Liu Demin, Guo Hongjie, Zhang Genyuan, Kong Linghao, Shao Junqi, Zhang Jinqi, 2019. Petrogenesis and Tectonic Setting of High-Mg Volcanic Rock Xenoliths in Jianshui Area, Southeast Yunnan, China. Earth Science, 44(5): 1749-1760. doi: 10.3799/dqkx.2019.078

    滇东南建水地区高镁火山岩包体的成因和构造背景

    doi: 10.3799/dqkx.2019.078
    基金项目: 

    苏北盆地干热岩控热构造背景研究项目 2018016417

    中国地质调查局项目 1212011220400

    详细信息
      作者简介:

      刘德民(1975-), 男, 副教授, 长期从事区域地质矿产调查方面的教学和研究

      通讯作者:

      刘德民

    • 中图分类号: P581

    Petrogenesis and Tectonic Setting of High-Mg Volcanic Rock Xenoliths in Jianshui Area, Southeast Yunnan, China

    • 摘要: 在滇东南建水地区发现产于峨眉山玄武岩中的高镁火山岩包体, 这对于地幔柱的形成演化具有重要研究意义.对这些包体进行了锆石U-Pb年代学、地球化学和岩矿分析.高镁火山岩包体具斑状结构, 致密块状构造, 斑晶主要为贵橄榄石和透辉石.13颗锆石U-Pb LA-ICP-MS加权平均年龄为259±2 Ma(MSWD=1.9), 显示与寄主岩石同期形成.包体岩石具有高镁(Mg#=68~75)、低硅(SiO2=45.11%~45.93%)特征, 轻稀土元素(LREE)、高场强元素(HFSE)富集而重稀土元素(HREE)亏损, 属于亚碱性、拉斑玄武岩系列, 具有板内玄武岩(IPB)特征.火山岩包体的原始岩浆起源于石榴子石二辉橄榄岩低程度部分熔融的产物, 岩浆演化过程中发生了橄榄石和单斜辉石的分离结晶作用, 在侵位上升过程中未受明显的地壳混染作用.该高镁火山岩的存在, 显示地幔柱除了垂直上升运动外, 在地球深部不同的边界还有多次侧向扩展移动, 表明滇东南晚二叠世存在峨眉山地幔柱的一个分支-地幔枝活动.

       

    • 图  1  峨眉山玄武岩分布(a)和云南建水县研究区地质略图(b)

      改自何斌等(2006).F1.怒江断裂; F2.柯街断裂; F3.澜沧江断裂; F4.金沙江-哀牢山断裂; F5, F6, F7.甘孜-理塘断裂; F8.龙门山-箐河断裂; F9.炉霍-道孚断裂; F10.雅砻江-绿汁江断裂; F11.安宁河-益门断裂; F12.普渡河-小江断裂; F13.罗泽河-紫云断裂; F14.师宗-弥勒断裂; 1.第四系; 2.新近系; 3.三叠系; 4.二叠系; 5.石炭系; 6.泥盆系; 7.南华系; 8.峨眉山玄武岩; 9.晚石炭世玄武岩; 10.断裂; 11.采样位置

      Fig.  1.  Distribution of Emeishan basalts (a) and geological sketch map of Jianshui area, Yunnan (b)

      图  2  高镁火山岩包体野外露头(a)及镜下橄榄石斑晶溶蚀边(b)(+)

      Pl.斜长石; Ol.橄榄石

      Fig.  2.  Field photograph (a) and microphotograph characters (b) of high-Mg volcanic rock xenoliths in Emeishan basalts

      图  3  建水高镁火山岩部分代表性锆石阴极发光图

      Fig.  3.  Cathodoluminescence (CL) images of selected zircons from the high-Mg volcanic xenoliths

      图  4  建水高镁火山岩锆石U-Pb年龄协和图及加权平均年龄

      Fig.  4.  LA-ICP-MS zircon U-Pb concordia diagram for the high-Mg volcanic xenoliths in Jiangshui area

      图  5  高镁火山岩包体TAS分类和AFM图解

      a.底图据Le et al.(1986); b.底图据Ivrine and Baargar(1971)

      Fig.  5.  TAS (a) and AFM diagrams (b) for the high-Mg volcanic xenoliths

      图  6  高镁火山岩包体原始地幔标准化微量元素蛛网图(a)和球粒陨石标准化稀土元素配分图(b)

      标准值据Winchester and Floyd(1977)

      Fig.  6.  Primitive mantle-normalized trace element spider diagram (a) and chondrite-normalized REE diagram (b) for the high-Mg volcanic xenoliths

      图  7  Nb/Th-Zr/Nb(a)和Zr/Y-Nb/Y图解(b)

      底图据Condie(2003)

      Fig.  7.  Nb/Th-Zr/Nb(a) and Zr/Y-Nb/Y (b) diagrams for the high-Mg volcanic xenoliths

      图  8  峨眉山玄武岩高镁包体(La/Sm)-(Sm/Yb)图解

      底图据Lassiter and Depaolo(1997).PM.原始地幔;DMM.亏损地幔;CLM.大陆岩石圈地幔;LC.下地壳;CC.整个地壳;UC.上地壳

      Fig.  8.  (La/Sm)-(Sm/Yb) diagram for the high-Mg xenoliths in Emeishan basalt

      图  9  高镁火山岩包体Ti-Zr-Y图解

      底图据Pearce and Cann(1973)

      Fig.  9.  Ti-Zr-Y for the high-Mg volcanic xenoliths

      图  10  高镁火山岩包体Th-Hf-Nb图解

      底图据Wood(1980)

      Fig.  10.  Th-Hf-Nb diagram for the high-Mg volcanic xenoliths

      图  11  建水高镁火山岩地幔柱(枝)成因模式

      1.高镁火山岩包体;2.峨眉山玄武岩;3.沉积盖层;4.变质基底;5.地壳热熔体;6.地幔熔融热流体;7.核幔边界形成的熔融热流体

      Fig.  11.  A possible mantle plume branches model for explanation of the origin of the xenoliths in Emeishan basalt

      表  1  高镁火山岩包体锆石U-Pb年龄测试分析结果

      Table  1.   LA-ICP-MS zircon U-Pb analytical results of the high-Mg volcanic xenoliths

      点号 Pb 232Th(10-6) 238U(10-6) Th/U 207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U 206Pb/238U
      比值 1σ 比值 1σ 比值 1σ 年龄(Ma) 1σ 年龄(Ma) 1σ 年龄(Ma) 1σ
      1 8 74 207 0.36 0.050 6 0.002 3 0.225 3 0.011 0 0.032 1 0.000 6 391 176.8 288 24.5 262 4.9
      2 30 557 7 097 0.79 0.053 3 0.004 0 0.226 4 0.016 3 0.030 6 0.000 4 326 61.3 258 6.5 252 3.2
      3 22 231 538 0.43 0.051 1 0.001 6 0.231 6 0.007 3 0.032 6 0.000 4 364 82.9 266 9.6 255 4.3
      4 26 371 683 0.54 0.055 7 0.002 3 0.230 4 0.008 2 0.030 0 0.000 5 393 90.3 273 38.4 258 3.1
      5 40 569 1 040 0.55 0.051 6 0.001 3 0.215 3 0.005 4 0.030 0 0.000 3 543 51.3 282 6.4 250 4.9
      6 23 281 575 0.49 0.050 0 0.001 5 0.220 9 0.006 3 0.031 9 0.000 4 503 86.2 275 87.7 257 3.6
      7 16 131 429 0.30 0.047 0 0.002 5 0.200 0 0.010 8 0.030 6 0.000 7 478 72.3 280 151.3 258 4.3
      8 16 204 363 0.56 0.053 2 0.001 8 0.250 7 0.008 4 0.034 0 0.000 5 363 77.4 282 8.8 271 3.8
      9 22 299 535 0.56 0.053 9 0.001 6 0.235 7 0.007 6 0.031 4 0.000 4 521 338.6 282 63.4 261 8.7
      10 25 242 613 0.39 0.050 7 0.001 2 0.234 7 0.005 8 0.033 4 0.000 4 171 144.3 252 19.1 258 2.6
      11 21 251 525 0.48 0.053 5 0.002 1 0.228 8 0.009 2 0.030 8 0.000 5 190 151.1 257 17.5 261 5.0
      12 21 235 541 0.43 0.051 4 0.001 8 0.221 8 0.007 5 0.031 2 0.000 4 387 96.1 276 37.4 262 4.1
      13 16 175 361 0.49 0.052 2 0.001 5 0.245 1 0.007 2 0.034 1 0.000 4 477 41.1 288 13.7 267 5.0
      14 61 145 447 0.32 0.067 4 0.002 3 1.056 2 0.034 0 0.112 7 0.001 3 850 71.1 732 16.8 689 7.8
      15 60 174 352 0.49 0.065 2 0.001 7 1.233 1 0.033 1 0.136 8 0.001 3 789 55.6 816 15.1 827 7.3
      16 58 84 344 0. 42 0.071 2 0.001 6 1.448 0 0.034 4 0.146 1 0.002 2 965 46.3 909 14.3 879 12.3
      17 47 76 113 0.67 0.108 1 0.002 0 4.922 1 0.098 2 0.327 3 0.003 9 1 768 38.1 1 806 16.9 1 825 18.8
      18 133 130 238 0.55 0.166 7 0.002 8 9.573 2 0.220 8 0.412 1 0.009 3 2 524 28.9 2 395 21.3 2 225 42.5
      19 26 56 34 1.68 0.159 2 0.005 7 9.902 2 0.358 3 0.451 2 0.008 1 2 447 59.4 2 426 33.4 2 401 35.9
      下载: 导出CSV

      表  2  二叠纪高镁火山岩包体主量元素及峨眉山玄武岩岩石化学平均组成(%)

      Table  2.   Major element data for high-Mg volcanic xenoliths and the mean data from Emeishan basalt (%)

      序号 SiO2 MgO FeO Fe2O3 Al2O3 Na2O K2O CaO TiO2 MnO P2O5 H2O+ CO2 Mg# LOI
      本文测试数据 D02-1 45.11 10.46 8.05 5.22 13.12 2.16 0.81 9.91 2.29 0.23 0.31 1.96 0.04 69.80 1.13
      D02-2 45.86 10.79 8.11 4.62 13.18 2.17 0.77 9.69 2.22 0.22 0.31 1.66 0.11 70.41 0.86
      D02-3 45.14 11.12 9.15 3.45 12.93 2.27 0.67 10.01 2.16 0.22 0.28 2.20 0.10 68.40 1.27
      D02-4 45.28 10.92 9.05 3.51 13.11 2.31 0.68 9.93 2.18 0.22 0.29 2.15 0.06 68.30 1.22
      D02-5 45.93 10.76 8.15 4.52 13.17 2.21 0.77 9.66 2.23 0.22 0.32 1.63 0.12 70.21 0.85
      D02-6 45.79 10.75 8.05 4.57 13.06 2.17 0.75 9.73 2.23 0.22 0.31 1.92 0.10 70.40 1.17
      D02-7 45.78 10.35 6.21 6.66 13.06 2.16 0.75 9.83 2.22 0.21 0.32 1.89 0.11 74.91 1.33
      D02-8 45.77 10.81 8.05 4.71 13.19 2.15 0.76 9.72 2.23 0.22 0.31 1.68 0.08 70.50 0.88
      D02-9 45.76 10.28 6.12 7.01 13.05 2.18 0.76 9.79 2.22 0.22 0.32 1.92 0.06 75.11 1.33
      D02-10 45.93 10.76 8.15 4.52 13.17 2.21 0.77 9.66 2.23 0.22 0.32 1.63 0.12 70.20 0.85
      D02-11 45.79 10.41 6.31 6.62 13.08 2.14 0.75 9.85 2.21 0.22 0.29 1.87 0.12 74.70 1.33
      D02-12 45.88 10.29 6.18 6.78 13.06 2.16 0.76 9.86 2.23 0.22 0.31 1.88 0.07 74.81 1.29
      D02-13 45.91 10.31 6.25 6.54 13.08 2.14 0.76 10.03 2.21 0.21 0.32 1.85 0.08 74.60 1.25
      D02-14 45.76 10.28 6.11 7.01 13.05 2.18 0.76 9.79 2.22 0.22 0.31 1.92 0.06 75.00 1.33
      峨眉山玄武岩 1 48.11 6.27 8.68 4.61 13.36 2.74 1.15 8.16 2.93 0.18 0.31
      2 49.95 6.07 7.82 5.82 13.86 2.92 1.29 8.69 3.01 0.21 0.41
      3 48.45 4.61 8.66 5.16 13.74 2.62 1.28 8.21 3.07 0.17 0.33
      4 48.17 6.06 7.61 5.74 13.58 2.65 0.87 9.23 2.78 0.19 0.31
      5 47.22 6.59 7.94 4.73 12.83 2.91 1.11 9.47 3.21 0.18 0.35
      6 49.07 7.01 12.05 12.92 3.14 0.84 8.75 2.42 0.18 0.28 55.53 3.64
      注:序号1~2数据分别来源于文献(潘杏南等,1987)中204、608个样品的平均值;3数据来源于文献(熊舜华和李建林,1984)中62个样品的平均值;4数据来源于文献(陈智梁和陈世瑜,1987)中114个样品的平均值;5数据为本人在收集文献(侯增谦等,1999宋谢炎等,2001)中选取的53个样品的平均值;6数据来源于文献(肖龙等,2003)中25个样品的平均值.本文测试数据由自然资源部武汉地质矿产测试中心化学实验室测试完成,Mg#=Mg/(Mg+Fe2+).
      下载: 导出CSV

      表  3  高镁火山岩包体的微量和稀土元素地球化学数据(10-6)

      Table  3.   Trace and rare earth element data for the high-Mg volcanic xenoliths (10-6)

      D02-1 D02-2 D02-3 D02-4 D02-5 D02-6 D02-7 D02-8 D02-9 D02-10 D02-11 D02-12 D02-13 D02-14
      Sc 31.41 31.09 31.37 30.65 31.23 31.63 31.57 31.15 30.35 31.02 30.92 29.85 31.45 30.39
      Co 57.96 58.29 57.41 60.44 57.85 58.93 58.92 57.62 58.59 58.76 57.83 59.99 60.89 58.91
      Cu 43.92 43.15 42.27 44.95 42.71 42.87 43.34 42.10 45.03 43.95 41.92 43.31 46.59 42.61
      Zn 100.71 92.01 91.97 101.72 91.99 100.11 98.15 93.33 97.55 98.83 94.69 100.92 102.51 97.81
      Rb 21.45 20.97 21.36 24.36 21.17 25.38 23.61 22.42 24.98 23.61 23.44 25.05 23.67 24.29
      Zr 122 112 114 116 113 123 117 113 121 122 113 116 116 115
      Nb 23.180 21.120 18.660 20.735 19.890 21.170 21.440 19.195 21.250 21.210 19.730 20.540 20.930 20.140
      Hf 3.630 3.150 3.160 3.215 3.160 3.470 3.140 3.165 3.310 3.390 3.170 3.320 3.110 3.250
      Ta 1.870 1.620 1.370 1.465 1.490 1.520 1.540 1.412 1.470 1.510 1.430 1.460 1.470 1.450
      Pb 2.740 2.480 3.080 3.855 2.730 3.150 2.610 2.995 2.730 2.980 2.910 3.470 4.240 3.190
      Th 2.930 2.530 2.340 2.460 2.440 2.510 2.520 2.381 2.510 2.520 2.420 2.410 2.510 2.410
      U 0.51 0.48 0.48 0.52 0.49 0.54 0.48 0.471 0.47 0.51 0.46 0.53 0.51 0.49
      Ba 334 349 310 344 329 302 330 317 388 345 3242 381 307 353
      Cr 580 700 673 648 686 609 615 633 596 603 593 671 625 632
      Ni 192 215 207 211 211 202 202 206 200 201 205 207 215 206
      Sr 321 297 298 346 298 330 329 318 331 330 338 345 347 342
      V 272 260 254 277 257 275 270 258 267 271 263 277 276 270
      Nb/U 45.450 43.990 38.880 40.320 40.590 39.210 45.040 40.745 44.930 41.410 42.610 38.610 42.030 41.110
      (Th/Ta)N 0.760 0.750 0.820 0.805 0.780 0.810 0.790 0.815 0.820 0.820 0.810 0.790 0.820 0.810
      La 15.430 15.090 14.760 15.650 15.370 15.870 16.040 15.265 15.960 16.010 15.770 15.850 15.450 15.110
      Ce 31.950 31.910 30.810 31.640 31.860 32.670 33.060 31.735 32.870 32.890 32.660 31.990 31.290 29.910
      Pr 4.760 4.650 4.520 4.685 4.650 4.820 4.870 4.635 4.850 4.840 4.750 4.740 4.630 4.490
      Nd 20.27 19.72 19.36 20.065 20.07 20.85 20.91 19.92 20.88 20.83 20.48 20.29 19.84 19.21
      Sm 4.85 4.75 4.56 4.81 4.75 5.04 5.02 4.765 5.03 4.96 4.97 4.84 4.78 4.57
      Eu 1.76 1.72 1.71 1.815 1.72 1.82 1.84 1.76 1.83 1.85 1.81 1.82 1.81 1.68
      Gd 4.620 4.540 4.510 4.555 4.560 4.720 4.720 4.580 4.720 4.570 4.650 4.630 4.480 4.320
      Tb 0.710 0.710 0.690 0.715 0.720 0.730 0.730 0.705 0.730 0.720 0.720 0.720 0.710 0.680
      Dy 3.85 3.76 3.62 3.83 3.81 3.88 3.98 3.78 3.93 3.88 3.94 3.87 3.79 3.64
      Ho 0.720 0.710 0.720 0.715 0.710 0.740 0.750 0.730 0.750 0.730 0.740 0.720 0.710 0.670
      Er 1.84 1.76 1.75 1.86 1.78 1.89 1.92 1.82 1.91 1.86 1.89 1.85 1.87 1.76
      Tm 0.26 0.26 0.26 0.26 0.26 0.27 0.27 0.26 0.27 0.26 0.26 0.26 0.26 0.24
      Yb 1.610 1.550 1.560 1.605 1.540 1.630 1.630 1.595 1.650 1.650 1.630 1.620 1.590 1.520
      Lu 0.24 0.23 0.24 0.23 0.23 0.24 0.26 0.24 0.25 0.25 0.24 0.23 0.23 0.21
      Y 16.990 16.640 16.330 17.115 16.960 17.240 17.560 16.810 17.410 17.550 17.270 17.210 17.020 16.320
      ∑REE 92.870 90.530 89.040 92.340 92.010 95.140 95.980 91.775 95.560 95.280 94.510 93.420 91.260 87.980
      (La/Nb)N 0.690 0.790 0.730 0.805 0.860 0.780 0.790 0.755 0.790 0.770 0.780 0.830 0.780 0.760
      下载: 导出CSV
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