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    内蒙古北山造山带花岗岩地球化学、锆石U-Pb年龄和Hf同位素特征及地质意义

    李敏 任邦方 滕学建 张永 段霄龙 牛文超 段连峰

    李敏, 任邦方, 滕学建, 张永, 段霄龙, 牛文超, 段连峰, 2018. 内蒙古北山造山带花岗岩地球化学、锆石U-Pb年龄和Hf同位素特征及地质意义. 地球科学, 43(12): 4586-4605. doi: 10.3799/dqkx.2017.598
    引用本文: 李敏, 任邦方, 滕学建, 张永, 段霄龙, 牛文超, 段连峰, 2018. 内蒙古北山造山带花岗岩地球化学、锆石U-Pb年龄和Hf同位素特征及地质意义. 地球科学, 43(12): 4586-4605. doi: 10.3799/dqkx.2017.598
    Li Min, Ren Bangfang, Teng Xuejian, Zhang Yong, Duan Xiaolong, Niu Wenchao, Duan Lianfeng, 2018. Geochemical Characteristics, Zircon U-Pb Age and Hf Isotope and Geological Significance of Granitoid in Beishan Orogenic Belt. Earth Science, 43(12): 4586-4605. doi: 10.3799/dqkx.2017.598
    Citation: Li Min, Ren Bangfang, Teng Xuejian, Zhang Yong, Duan Xiaolong, Niu Wenchao, Duan Lianfeng, 2018. Geochemical Characteristics, Zircon U-Pb Age and Hf Isotope and Geological Significance of Granitoid in Beishan Orogenic Belt. Earth Science, 43(12): 4586-4605. doi: 10.3799/dqkx.2017.598

    内蒙古北山造山带花岗岩地球化学、锆石U-Pb年龄和Hf同位素特征及地质意义

    doi: 10.3799/dqkx.2017.598
    基金项目: 

    中国地质调查局项目 12120114064601

    中国地质调查局项目 121201006000172601

    详细信息
      作者简介:

      李敏(1986-), 男, 工程师, 主要研究方向为岩石地球化学和构造地质学

    • 中图分类号: P595

    Geochemical Characteristics, Zircon U-Pb Age and Hf Isotope and Geological Significance of Granitoid in Beishan Orogenic Belt

    • 摘要: 砾石滩地区位于内蒙古额济纳旗西部,晚古生代花岗岩出露广泛,是研究北山造山带晚古生代地质演化的关键地区.锆石LA-MC-ICP-MS U-Pb测年结果显示,该地区的花岗岩形成于晚石炭世,其中英云闪长岩年龄为310.8±1.4 Ma,花岗闪长岩年龄为310.3±1.4 Ma和306.0±1.2 Ma,二长花岗岩年龄为308.7±1.4 Ma.岩石学及化学成分显示其为准铝质-弱过铝质、中钾钙碱性系列岩石;稀土配分曲线呈现轻稀土元素相对富集的右倾分布特征,弱负铕异常(δEu为0.7~0.9);岩石富集大离子亲石元素Rb、K等,具有负的Nb、Ta和Ti异常;英云闪长岩、花岗闪长岩具有不均一的εHft)值(3.8~14.8)、(7.3~14.0),二阶段Hf同位素模式年龄tDMC分别为378~1 083 Ma、433~868 Ma.北山造山带北部晚石炭世英云闪长岩、花岗闪长岩、二长花岗岩的形成与壳幔混合有关,产生于大洋岩石圈俯冲过程中,形成于陆缘弧环境,该过程诱发了地幔对流,因而产生了幔源岩浆底侵,并将元古宙基底岩石熔融,壳幔混合之后形成晚石炭世大规模花岗岩类.

       

    • 图  1  额济纳旗砾石滩地区地质简图

      1.下石炭统绿条山组;2.下石炭统白山组;3.流纹岩;4.晚石炭世英云闪长岩;5.晚石炭世花岗闪长岩;6.晚石炭世二长花岗岩;7.二叠纪花岗岩;8.第四系;9.地质界线;10.采样位置;11.缝合带;12.构造分区界线;13.国界;14.上白垩统赤金堡组

      Fig.  1.  Geological sketch map of Lishitan area in Ejina county

      图  2  镁铁质包体

      Fig.  2.  Mafic inclusions

      图  3  研究区花岗岩类野外与显微照片

      a.英云闪长岩;b.英云闪长岩偏光显微照片;c.二长花岗岩侵入花岗闪长岩;d.花岗闪长岩偏光显微照片;e.二长花岗岩;f.二长花岗岩偏光显微照片

      Fig.  3.  Field photos and photomicrographs of granitoids in the study area

      图  4  砾石滩地区花岗岩类部分锆石阴极发光图像及年龄

      黄圈为U-Pb测点,蓝圈为Hf同位素测点

      Fig.  4.  CL image and dating of zircons for granitoids in Lishitan area

      图  5  砾石滩地区花岗岩类LA-MC-ICP-MS锆石U-Pb年龄谐和图

      Fig.  5.  Zircon LA-MC-ICP-MS U-Pb concordia diagrams of granitoids in Lishitan area

      图  6  砾石滩地区花岗岩类K2O-SiO2图解(a)和A/CNK-A/NK图解(b)

      b.据Peccerillo and Taylor(1976)

      Fig.  6.  Diagrams of K2O versus SiO2 (a) and A/CNK-A/NK (b) of granitoids in Lishitan area

      图  7  砾石滩地区花岗岩类稀土元素球粒陨石标准化配分模式图(a)和原始地幔标准化微量元素蛛网图(b)

      球粒陨石标准化值、原始地幔标准化值据Sun and McDonough(1989)

      Fig.  7.  Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element patterns (b) of granitoids in Lishitan area

      图  8  砾石滩地区花岗岩类构造判别图解

      a.(Y+Nb)-Rb判别图, 据Pearce et al.(1984);ORG.大洋脊花岗岩;WPG.板内花岗岩;VAG.火山弧花岗岩;syn-COLG.同碰撞花岗岩;b.R1-R2判别图, 据Batchelor and Bowden(1985), R1=4Si-11(Na+K)-2(Fe+Ti),R2=6Ca+2Mg+Al

      Fig.  8.  Tectonic discrimination diagrams of granitoids in Lishitan area

      图  9  砾石滩地区英云闪长岩、花岗闪长岩的锆石Hf同位素时间演化图解

      Fig.  9.  Zircon Hf isotope time evolution diagram of the tonalite and granodiorite in Lishitan area

      表  1  砾石滩地区花岗岩LA-MC-ICP-MS U-Pb同位素分析结果

      Table  1.   Zircon LA-MC-ICP-MS U-Pb dating results of granitoids in Lishitan area

      样品号 含量(10-6) 同位素比值 表面年龄(Ma)
      02TW1 Pb U 206Pb/238U 207Pb/235U 207Pb/206Pb 208Pb/232Th 232Th/238U 206Pb/238U 207Pb/235U 207Pb/206Pb
      1 4 76 0.049 6 0.000 6 0.357 3 0.024 9 0.052 2 0.003 7 0.012 8 0.000 3 0.396 0 0.000 9 312 4 310 22 296 161
      2 4 77 0.049 3 0.000 7 0.362 5 0.045 7 0.053 3 0.006 8 0.012 2 0.000 5 0.531 5 0.001 1 310 4 314 40 343 287
      3 5 98 0.048 8 0.000 6 0.353 1 0.015 9 0.052 5 0.002 4 0.013 0 0.000 3 0.386 1 0.000 5 307 4 307 14 307 103
      4 4 86 0.049 7 0.000 5 0.359 4 0.020 1 0.052 4 0.002 9 0.014 1 0.000 3 0.378 8 0.000 6 313 3 312 17 303 126
      5 6 117 0.049 8 0.000 5 0.360 3 0.016 2 0.052 5 0.002 3 0.013 3 0.000 2 0.400 5 0.000 3 313 3 312 14 308 101
      6 5 108 0.049 5 0.000 5 0.356 3 0.015 6 0.052 2 0.002 3 0.013 8 0.000 2 0.360 8 0.000 6 312 3 309 14 293 99
      7 6 114 0.049 6 0.000 5 0.359 8 0.019 9 0.052 6 0.002 9 0.012 3 0.000 2 0.435 7 0.001 3 312 3 312 17 311 125
      8 6 127 0.049 3 0.000 5 0.362 1 0.014 9 0.053 3 0.002 1 0.012 4 0.000 2 0.396 4 0.000 8 310 3 314 13 341 90
      9 4 77 0.049 4 0.000 6 0.362 8 0.028 7 0.053 3 0.004 3 0.010 7 0.000 4 0.369 4 0.000 6 311 4 314 25 343 181
      10 6 127 0.049 5 0.000 5 0.362 2 0.013 8 0.053 1 0.002 0 0.013 8 0.000 2 0.445 4 0.001 5 311 3 314 12 331 86
      11 4 92 0.048 0 0.000 6 0.348 3 0.023 3 0.052 6 0.003 5 0.015 3 0.000 4 0.341 2 0.001 3 303 4 303 20 310 154
      12 6 121 0.049 2 0.000 5 0.361 3 0.018 0 0.053 3 0.002 6 0.014 7 0.000 4 0.354 3 0.000 9 309 3 313 16 341 109
      13 4 82 0.049 2 0.000 6 0.364 1 0.025 0 0.053 7 0.003 9 0.014 1 0.000 3 0.455 5 0.000 7 309 4 315 22 358 163
      14 6 115 0.049 6 0.000 6 0.364 3 0.021 9 0.053 3 0.003 4 0.014 3 0.000 2 0.636 3 0.004 2 312 4 315 19 341 145
      15 4 84 0.049 9 0.000 6 0.360 3 0.021 6 0.052 3 0.003 2 0.013 9 0.000 3 0.395 1 0.000 6 314 4 312 19 300 139
      16 6 117 0.049 4 0.000 5 0.362 5 0.017 8 0.053 2 0.002 7 0.014 6 0.000 2 0.446 1 0.000 9 311 3 314 15 336 114
      17 5 101 0.049 8 0.000 5 0.361 4 0.022 9 0.052 6 0.003 3 0.015 7 0.000 3 0.514 7 0.003 0 314 3 313 20 311 144
      18 4 71 0.049 0 0.000 6 0.360 2 0.041 3 0.053 3 0.006 4 0.015 5 0.000 7 0.385 8 0.000 8 309 4 312 36 340 270
      19 4 73 0.049 2 0.000 6 0.357 8 0.026 6 0.052 7 0.004 5 0.014 9 0.000 4 0.482 5 0.001 2 310 4 311 23 318 194
      20 5 97 0.049 4 0.000 5 0.360 5 0.024 3 0.053 0 0.003 6 0.007 3 0.000 4 0.461 0 0.000 4 311 3 313 21 327 153
      21 6 115 0.049 6 0.000 5 0.361 0 0.015 4 0.052 8 0.002 3 0.014 3 0.000 2 0.510 3 0.000 4 312 3 313 13 321 100
      22 7 132 0.049 6 0.000 6 0.362 7 0.013 3 0.053 0 0.001 9 0.015 3 0.000 2 0.593 8 0.003 2 312 4 314 12 328 83
      23 7 132 0.049 6 0.000 6 0.360 2 0.013 2 0.052 7 0.001 9 0.014 6 0.000 2 0.489 7 0.001 9 312 4 312 11 315 81
      24 20 372 0.049 6 0.000 6 0.362 1 0.007 0 0.053 0 0.000 9 0.015 3 0.000 1 0.577 6 0.004 0 312 4 314 6 328 39
      25 9 167 0.048 9 0.000 5 0.358 0 0.012 7 0.053 1 0.001 9 0.014 8 0.000 2 0.504 6 0.002 2 308 3 311 11 334 79
      样品号 含量(10-6) 同位素比值 表面年龄(Ma)
      06TW27 Pb U 206Pb/238U 207Pb/235U 207Pb/206Pb 208Pb/232Th 232Th/238U 206Pb/238U 207Pb/235U 207Pb/206Pb
      1 12 213 0.049 9 0.000 5 0.363 4 0.008 3 0.052 8 0.001 1 0.014 8 0.000 1 0.768 6 0.004 8 314 3 315 7 322 48
      2 8 153 0.049 9 0.000 5 0.363 9 0.011 2 0.052 9 0.001 7 0.013 7 0.000 1 0.825 3 0.003 0 314 3 315 10 323 72
      3 6 108 0.049 5 0.000 6 0.358 8 0.018 6 0.052 5 0.002 7 0.013 3 0.000 2 1.050 4 0.005 7 312 4 311 16 309 117
      4 8 145 0.049 4 0.000 5 0.358 7 0.012 8 0.052 6 0.001 8 0.013 5 0.000 1 0.934 0 0.003 4 311 3 311 11 312 79
      5 10 189 0.049 7 0.000 5 0.359 7 0.008 2 0.052 5 0.001 1 0.013 6 0.000 1 0.853 3 0.005 5 312 3 312 7 308 49
      6 9 159 0.049 6 0.000 5 0.359 4 0.016 4 0.052 5 0.002 4 0.013 6 0.000 1 0.881 1 0.003 3 312 3 312 14 309 106
      7 9 167 0.049 4 0.000 5 0.358 4 0.008 5 0.052 6 0.001 2 0.013 8 0.000 1 0.970 4 0.001 7 311 3 311 7 312 52
      8 8 145 0.049 3 0.000 5 0.356 8 0.018 1 0.052 5 0.002 7 0.013 9 0.000 2 1.031 4 0.004 3 310 3 310 16 308 116
      9 12 206 0.049 4 0.000 5 0.359 7 0.007 7 0.052 9 0.001 1 0.016 5 0.000 1 0.790 6 0.001 2 311 3 312 7 323 46
      10 12 210 0.049 0 0.000 5 0.353 8 0.010 7 0.052 4 0.001 5 0.018 3 0.000 2 0.835 4 0.004 1 308 3 308 9 301 64
      11 16 268 0.049 3 0.000 5 0.356 8 0.006 4 0.052 5 0.000 9 0.018 8 0.000 1 0.797 3 0.002 1 310 3 310 6 308 37
      12 8 138 0.049 5 0.000 6 0.358 8 0.011 9 0.052 6 0.001 7 0.020 3 0.000 3 0.525 2 0.001 3 311 4 311 10 313 73
      13 15 253 0.049 1 0.000 5 0.355 4 0.008 5 0.052 5 0.001 2 0.020 7 0.000 1 0.798 3 0.000 4 309 3 309 7 307 52
      14 18 313 0.046 3 0.000 5 0.455 1 0.008 1 0.071 3 0.001 2 0.024 4 0.000 1 0.722 6 0.002 2 292 3 381 7 966 33
      15 12 197 0.048 9 0.000 5 0.354 7 0.017 9 0.052 6 0.002 6 0.022 9 0.000 5 0.804 5 0.002 2 308 3 308 16 311 111
      16 7 115 0.049 4 0.000 5 0.358 3 0.011 2 0.052 6 0.001 6 0.025 6 0.000 2 0.669 7 0.001 1 311 3 311 10 312 70
      17 12 179 0.049 1 0.000 5 0.355 4 0.010 6 0.052 5 0.001 5 0.025 8 0.000 3 0.871 6 0.000 8 309 3 309 9 308 64
      18 15 251 0.049 4 0.000 5 0.358 7 0.007 8 0.052 6 0.001 1 0.021 6 0.000 1 0.698 9 0.001 8 311 3 311 7 312 47
      19 11 180 0.049 2 0.000 5 0.356 8 0.009 6 0.052 7 0.001 4 0.019 6 0.000 1 0.855 0 0.000 9 309 3 310 8 314 60
      20 17 371 0.037 2 0.000 4 0.419 0 0.006 6 0.081 7 0.001 2 0.021 4 0.000 1 0.603 7 0.002 5 235 2 355 6 1239 29
      21 9 166 0.049 4 0.000 6 0.360 3 0.013 2 0.052 9 0.001 9 0.019 5 0.000 3 0.716 3 0.008 5 311 4 312 11 326 82
      22 12 206 0.048 8 0.000 5 0.352 4 0.006 9 0.052 3 0.001 0 0.017 2 0.000 1 0.842 3 0.001 9 307 3 307 6 299 42
      23 8 154 0.039 2 0.000 5 0.629 0 0.016 6 0.116 3 0.002 8 0.023 2 0.000 2 0.714 0 0.001 3 248 3 495 13 1900 44
      24 17 310 0.048 7 0.000 5 0.352 9 0.007 3 0.052 5 0.001 0 0.016 2 0.000 1 0.822 3 0.004 4 307 3 307 6 308 45
      样品号 含量(10-6) 同位素比值 表面年龄(Ma)
      16TW10 Pb U 206Pb/238U 207Pb/235U 207Pb/206Pb 208Pb/232Th 232Th/238U 206Pb/238U 207Pb/235U 207Pb/206Pb
      1 10 196 0.048 6 0.000 5 0.353 7 0.007 2 0.052 8 0.001 0 0.015 8 0.000 1 0.596 1 0.002 9 306 3 308 6 320 44
      2 13 237 0.048 3 0.000 5 0.349 0 0.007 7 0.052 4 0.001 1 0.015 9 0.000 1 0.674 0 0.002 6 304 3 304 7 304 49
      3 10 203 0.048 6 0.000 5 0.353 6 0.008 9 0.052 7 0.001 3 0.015 3 0.000 1 0.526 5 0.000 9 306 3 307 8 317 55
      4 12 230 0.048 2 0.000 5 0.350 9 0.006 7 0.052 8 0.001 0 0.015 3 0.000 0 0.714 9 0.000 7 304 3 305 6 319 41
      5 12 213 0.048 5 0.000 5 0.353 3 0.007 3 0.052 8 0.001 0 0.015 6 0.000 1 0.753 1 0.001 5 305 3 307 6 322 45
      6 10 198 0.048 5 0.000 5 0.351 5 0.007 1 0.052 6 0.001 0 0.015 7 0.000 1 0.637 1 0.000 7 305 3 306 6 310 44
      7 16 312 0.048 6 0.000 5 0.351 0 0.005 8 0.052 3 0.000 8 0.016 0 0.000 1 0.476 4 0.001 8 306 3 306 5 301 34
      8 9 182 0.048 6 0.000 5 0.352 0 0.008 8 0.052 5 0.001 2 0.015 8 0.000 1 0.532 5 0.001 9 306 3 306 8 309 54
      9 12 234 0.048 4 0.000 5 0.351 8 0.006 3 0.052 7 0.000 9 0.015 9 0.000 1 0.648 6 0.002 7 305 3 306 6 316 39
      10 9 181 0.048 6 0.000 5 0.350 9 0.008 5 0.052 4 0.001 2 0.016 0 0.000 1 0.473 2 0.002 9 306 3 305 7 303 53
      11 4 80 0.048 7 0.000 5 0.354 0 0.015 0 0.052 7 0.002 2 0.016 3 0.000 2 0.479 7 0.001 4 307 3 308 13 316 96
      12 8 156 0.048 7 0.000 5 0.353 3 0.009 9 0.052 7 0.001 4 0.016 0 0.000 1 0.557 7 0.002 7 306 3 307 9 315 62
      13 16 311 0.048 9 0.000 5 0.354 4 0.006 1 0.052 6 0.000 9 0.015 4 0.000 1 0.558 3 0.002 6 308 3 308 5 311 37
      14 10 192 0.048 8 0.000 5 0.353 5 0.007 9 0.052 5 0.001 1 0.015 0 0.000 1 0.486 3 0.001 0 307 3 307 7 307 49
      15 9 186 0.048 7 0.000 5 0.351 2 0.008 6 0.052 3 0.001 2 0.014 5 0.000 1 0.512 7 0.002 2 306 3 306 7 300 52
      16 9 186 0.048 7 0.000 5 0.354 0 0.007 5 0.052 7 0.001 1 0.013 2 0.000 1 0.439 7 0.002 2 307 3 308 6 316 46
      17 13 257 0.048 5 0.000 5 0.352 1 0.006 1 0.052 6 0.000 8 0.013 1 0.000 1 0.507 7 0.002 8 306 3 306 5 312 36
      18 15 295 0.048 8 0.000 5 0.353 8 0.005 7 0.052 6 0.000 8 0.013 4 0.000 1 0.479 5 0.002 1 307 3 308 5 310 34
      19 13 252 0.048 2 0.000 5 0.353 4 0.006 0 0.053 2 0.000 9 0.012 3 0.000 0 0.521 5 0.001 4 304 3 307 5 336 36
      20 14 272 0.049 1 0.000 5 0.356 0 0.005 8 0.052 6 0.000 8 0.012 9 0.000 0 0.544 8 0.001 4 309 3 309 5 311 34
      21 15 272 0.048 8 0.000 5 0.352 6 0.007 4 0.052 4 0.001 0 0.013 1 0.000 0 0.866 5 0.001 1 307 3 307 6 303 45
      22 22 396 0.048 6 0.000 5 0.352 4 0.005 1 0.052 6 0.000 7 0.012 5 0.000 0 0.920 0 0.002 1 306 3 307 4 313 30
      23 12 234 0.048 8 0.000 5 0.354 5 0.006 2 0.052 7 0.000 8 0.013 2 0.000 0 0.625 2 0.000 5 307 3 308 5 316 36
      24 13 242 0.048 6 0.000 5 0.352 6 0.005 9 0.052 6 0.000 8 0.013 5 0.000 0 0.745 9 0.002 1 306 3 307 5 311 36
      样品号 含量(10-6) 同位素比值 表面年龄(Ma)
      14TW20 Pb U 206Pb/238U 207Pb/235U 207Pb/206Pb 208Pb/232Th 232Th/238U 206Pb/238U 207Pb/235U 207Pb/206Pb
      1 4 73 0.049 6 0.000 6 0.360 3 0.021 8 0.052 7 0.003 1 0.015 1 0.000 3 0.742 9 0.004 8 312 4 312 19 317 135
      2 14 223 0.054 5 0.000 6 0.402 0 0.010 1 0.053 5 0.001 3 0.015 9 0.000 1 0.930 4 0.005 1 342 4 343 9 349 53
      3 9 139 0.055 0 0.000 6 0.405 5 0.012 1 0.053 4 0.001 5 0.016 8 0.000 1 0.792 2 0.002 4 345 3 346 10 347 65
      4 6 99 0.049 5 0.000 5 0.358 2 0.018 1 0.052 5 0.002 6 0.014 2 0.000 1 0.988 8 0.003 2 311 3 311 16 307 114
      5 12 174 0.054 1 0.000 6 0.398 2 0.010 4 0.053 4 0.001 4 0.016 6 0.000 1 1.378 8 0.012 8 340 4 340 9 344 59
      6 8 134 0.049 1 0.000 9 0.357 8 0.014 3 0.052 9 0.002 1 0.014 0 0.000 2 0.924 4 0.005 0 309 6 311 12 323 91
      7 29 493 0.049 2 0.000 5 0.358 1 0.005 3 0.052 8 0.000 7 0.013 4 0.000 1 1.114 8 0.001 4 310 3 311 5 319 31
      8 10 178 0.048 9 0.000 5 0.357 7 0.010 7 0.053 1 0.001 6 0.012 8 0.000 1 1.043 6 0.004 7 308 3 310 9 331 66
      9 9 152 0.049 5 0.000 6 0.359 3 0.017 1 0.052 6 0.002 5 0.014 2 0.000 1 1.030 5 0.001 8 312 4 312 15 311 110
      10 10 189 0.048 9 0.000 5 0.354 5 0.008 1 0.052 6 0.001 2 0.013 0 0.000 1 0.895 7 0.004 0 307 3 308 7 313 51
      11 15 273 0.048 7 0.000 5 0.352 9 0.007 5 0.052 6 0.001 1 0.013 2 0.000 1 1.059 5 0.002 3 306 3 307 7 312 46
      12 13 238 0.048 8 0.000 5 0.357 2 0.007 1 0.053 1 0.001 0 0.014 0 0.000 0 0.924 7 0.001 8 307 3 310 6 333 44
      13 12 211 0.049 9 0.000 5 0.358 4 0.007 6 0.052 1 0.001 0 0.014 9 0.000 1 0.880 7 0.003 5 314 3 311 7 291 45
      14 15 260 0.049 1 0.000 5 0.358 8 0.006 6 0.053 0 0.000 9 0.014 2 0.000 1 0.925 0 0.005 7 309 3 311 6 331 39
      15 6 114 0.049 2 0.000 5 0.358 9 0.016 1 0.052 9 0.002 3 0.015 9 0.000 2 0.633 9 0.003 3 310 3 311 14 324 98
      16 16 284 0.048 9 0.000 5 0.356 5 0.006 8 0.052 9 0.001 0 0.014 4 0.000 0 0.823 1 0.001 0 308 3 310 6 323 41
      17 10 192 0.048 6 0.000 5 0.354 9 0.008 5 0.053 0 0.001 3 0.015 8 0.000 1 0.696 5 0.001 3 306 3 308 7 328 54
      18 20 348 0.049 0 0.000 5 0.355 7 0.005 5 0.052 6 0.000 7 0.014 7 0.000 0 0.929 3 0.000 9 308 3 309 5 313 32
      19 16 284 0.048 7 0.000 5 0.351 4 0.006 0 0.052 4 0.000 8 0.014 6 0.000 1 0.958 7 0.006 8 306 3 306 5 301 36
      20 16 283 0.048 6 0.000 5 0.351 5 0.006 6 0.052 5 0.000 9 0.014 7 0.000 0 0.900 7 0.003 3 306 3 306 6 308 40
      21 16 280 0.048 6 0.000 5 0.386 8 0.013 6 0.057 7 0.002 0 0.013 8 0.000 1 1.110 8 0.007 1 306 3 332 12 519 77
      22 11 194 0.049 3 0.000 5 0.357 4 0.006 7 0.052 6 0.000 9 0.015 5 0.000 1 0.852 9 0.009 6 310 3 310 6 311 40
      23 11 202 0.049 3 0.000 5 0.357 3 0.015 0 0.052 6 0.002 0 0.016 1 0.000 3 0.682 4 0.010 1 310 3 310 13 312 86
      24 14 240 0.049 6 0.000 5 0.358 9 0.006 8 0.052 5 0.000 9 0.015 2 0.000 1 0.983 6 0.009 4 312 3 311 6 307 41
      注:测试单位为天津地质矿产研究所实验室.
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      表  2  砾石滩地区花岗岩类主量元素(%)、微量元素(10-6)分析结果

      Table  2.   Major (%) and trace element (10-6) compositions of granitoids in Lishitan area

      样号 英云闪长岩 花岗闪长岩1 花岗闪长岩2 二长花岗岩
      02.1 02.2 02.3 06.1 06.2 16.1 16.2 16.3 16.4 16.5 TW.1 TW.2
      SiO2 65.97 65.08 65.40 68.57 67.37 64.04 63.04 61.04 60.14 60.21 73.06 69.83
      Al2O3 16.56 17.20 16.56 15.11 15.04 15.39 15.57 16.09 16.33 16.23 13.92 14.27
      Fe2O3 1.04 1.02 1.12 2.02 2.57 2.65 3.29 3.28 3.26 2.86 1.85 1.83
      FeO 2.00 2.20 2.03 1.40 1.53 2.55 2.46 3.01 3.25 3.48 0.52 1.22
      CaO 4.91 4.07 4.92 3.39 3.78 4.28 4.61 5.45 5.66 6.16 1.83 2.84
      MgO 2.50 2.85 2.58 1.18 1.43 2.36 2.49 2.93 3.04 2.96 0.51 0.86
      K2O 1.27 1.40 1.10 3.35 3.14 2.91 2.50 2.50 2.15 2.58 3.57 2.73
      Na2O 4.28 4.62 4.18 3.43 3.39 3.03 3.12 3.07 3.05 3.08 3.51 3.63
      TiO2 0.36 0.38 0.40 0.48 0.56 0.56 0.61 0.62 0.70 0.56 0.27 0.41
      P2O5 0.098 0.100 0.095 0.120 0.140 0.130 0.140 0.140 0.140 0.140 0.060 0.100
      MnO 0.058 0.058 0.054 0.079 0.090 0.100 0.110 0.110 0.120 0.120 0.050 0.080
      FeOT 2.94 3.12 3.04 3.22 3.84 4.94 5.42 5.96 6.18 6.05 2.19 2.87
      Fe2O3T 3.26 3.47 3.38 3.58 4.27 5.48 6.02 6.63 6.87 6.73 2.43 3.19
      Mg# 64.10 65.72 64.04 43.47 43.83 50.07 49.06 50.75 50.76 50.63 32.86 38.61
      AR 1.70 1.79 1.65 2.16 2.06 1.87 1.77 1.70 1.62 1.68 2.63 2.18
      A/CNK 0.95 1.04 0.97 0.98 0.95 0.97 0.96 0.91 0.93 0.85 1.07 1.01
      SI 22.54 23.57 23.43 10.37 11.86 17.48 17.97 19.81 20.61 19.79 5.12 8.37
      FL 53.06 59.66 51.76 66.67 63.34 58.12 54.94 50.54 47.88 47.88 79.46 69.13
      MF 54.87 53.05 54.97 74.35 74.14 68.78 69.78 68.22 68.17 68.17 82.29 78.01
      δ 1.34 1.64 1.24 1.80 1.75 1.68 1.58 1.72 1.58 1.86 1.67 1.51
      K2O+Na2O 5.55 6.02 5.28 6.78 6.53 5.94 5.62 5.57 5.20 5.66 7.08 6.36
      K2O/Na2O 0.30 0.30 0.26 0.98 0.93 0.96 0.80 0.81 0.70 0.84 1.02 0.75
      灼失量 0.72 0.76 1.33 0.71 0.80 1.73 1.80 1.42 1.80 1.22 0.90 2.17
      Cr 45.60 50.30 42.70 3.63 3.83 10.10 11.40 15.70 12.00 17.80 2.94 2.54
      Ni 45.60 52.50 45.00 2.36 2.58 8.70 9.25 11.30 12.10 12.20 1.59 1.38
      Co 11.00 12.40 10.90 5.95 7.09 13.00 14.40 17.40 18.60 17.40 1.87 3.71
      Rb 50.00 57.50 43.40 105.00 95.80 78.80 66.10 79.60 62.20 80.70 145.00 92.00
      Cs 3.36 3.37 2.66 4.61 4.18 4.02 2.93 4.39 4.15 5.83 1.83 1.74
      Sr 296 356 315 215 219 256 276 287 278 357 149 230
      Ba 114 127 118 582 519 384 322 328 298 415 589 525
      V 52.70 55.10 53.40 62.50 74.90 110.00 123.00 140.00 158.00 144.00 19.30 35.60
      Sc 10.20 9.53 9.14 8.54 8.98 15.50 15.40 18.10 18.10 21.20 6.99 7.41
      Nb 3.26 2.83 3.21 7.50 8.27 6.62 7.03 5.88 7.33 5.80 7.80 6.83
      Ta 0.26 0.26 0.28 0.63 0.68 0.58 0.59 0.65 0.81 0.52 0.77 0.57
      Zr 113.0 104.0 109.0 198.0 215.0 132.0 121.0 65.2 99.2 140.0 104.0 154.0
      Hf 2.78 2.90 2.98 5.83 6.15 4.31 3.97 2.77 4.00 5.13 3.58 4.59
      Ga 15.00 14.70 14.50 16.00 16.20 16.00 16.70 17.10 17.80 17.00 13.20 14.40
      U 0.46 0.51 0.47 2.18 2.30 1.63 1.87 2.14 3.23 1.87 1.17 1.78
      Th 3.88 3.61 4.23 13.00 11.80 11.50 10.70 12.60 14.30 9.53 11.50 7.49
      La 9.75 9.29 8.90 23.40 26.10 21.20 18.90 20.70 16.10 17.80 20.70 19.00
      Ce 17.10 17.30 15.40 47.70 51.70 42.30 39.20 41.60 37.90 41.20 37.50 36.30
      Pr 2.46 2.42 2.31 5.98 6.37 5.15 4.76 5.32 5.30 5.72 4.22 4.26
      Nd 9.73 9.67 8.84 22.60 24.20 19.30 18.30 21.20 21.60 23.40 14.70 15.80
      Sm 2.25 2.30 1.90 4.42 4.77 3.66 3.67 4.53 4.74 4.98 2.57 2.97
      Eu 0.58 0.59 0.55 1.06 1.08 0.86 0.85 1.08 1.10 1.19 0.58 0.77
      Gd 2.30 2.25 2.02 4.01 4.44 3.29 3.30 4.35 4.31 4.69 2.29 2.67
      Tb 0.36 0.36 0.31 0.63 0.70 0.52 0.51 0.68 0.72 0.76 0.35 0.44
      Dy 1.97 2.08 1.78 3.85 4.24 3.14 3.15 4.06 4.41 4.66 2.01 2.61
      Ho 0.38 0.40 0.34 0.82 0.92 0.65 0.65 0.83 0.94 0.98 0.42 0.52
      Er 1.08 1.11 0.95 2.36 2.62 1.84 1.86 2.43 2.65 2.81 1.34 1.67
      Tm 0.16 0.17 0.15 0.36 0.41 0.28 0.29 0.37 0.41 0.44 0.22 0.27
      Yb 1.07 1.11 0.97 2.47 2.76 1.89 1.92 2.47 2.82 2.94 1.70 2.03
      Lu 0.16 0.18 0.15 0.40 0.44 0.30 0.30 0.38 0.44 0.46 0.29 0.34
      Y 12.20 12.10 10.30 21.80 24.30 16.40 16.50 18.60 21.00 22.60 11.70 15.50
      δEu 0.77 0.78 0.85 0.76 0.71 0.74 0.73 0.73 0.73 0.74 0.72 0.82
      ΣREE 61.55 61.33 54.87 141.86 155.05 120.78 114.16 128.60 124.44 134.63 100.59 105.15
      LREE/HREE 5.60 5.43 5.68 7.06 6.91 7.76 7.15 6.06 5.19 5.32 9.31 7.50
      (La/Lu)N 6.53 5.53 6.36 6.27 6.36 7.57 6.75 5.84 3.92 4.15 7.65 5.99
      (La/Sm)N 2.80 2.61 3.02 3.42 3.53 3.74 3.32 2.95 2.19 2.31 5.20 4.13
      (Gd/Lu)N 1.78 1.55 1.66 1.24 1.25 1.36 1.36 1.41 1.21 1.26 0.98 0.97
      注:测试工作由天津地质矿产研究所完成,常量元素采用XRF测试,其中FeO采用氢氟酸、硫酸溶样、重铬酸钾滴定容量法,微量元素采用ICP-MS测试.
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      表  3  英云闪长岩(02TW1)、花岗闪长岩(7218)锆石Hf同位素数据

      Table  3.   Zircon Hf isotopic data of the tonalite (02TW1) and granodiorite (7218)

      点号 t(Ma) 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 176Hf/177Hfi εHf(0) εHf(t) tDM(Ma) tDMC(Ma)
      02TW1.1 312 0.032 3 0.000 7 0.282 866 0.000 028 0.282 862 3.3 10.0 542 685
      02TW1.2 307 0.036 8 0.000 8 0.282 964 0.000 033 0.282 960 6.8 13.4 406 466
      02TW1.3 313 0.047 8 0.001 0 0.282 804 0.000 034 0.282 798 1.1 7.8 636 831
      02TW1.4 313 0.034 2 0.000 8 0.282 893 0.000 028 0.282 888 4.3 11.0 506 624
      02TW1.5 310 0.039 0 0.000 9 0.282 803 0.000 031 0.282 797 1.1 7.7 635 833
      02TW1.6 311 0.032 6 0.000 8 0.282 691 0.000 030 0.282 687 -2.9 3.8 790 1 083
      02TW1.7 311 0.041 0 0.000 9 0.282 732 0.000 035 0.282 726 -1.4 5.2 736 993
      02TW1.8 303 0.033 6 0.000 8 0.282 727 0.000 031 0.282 723 -1.6 4.9 740 1007
      02TW1.9 309 0.054 9 0.001 4 0.282 950 0.000 034 0.282 942 6.3 12.8 433 506
      02TW1.10 314 0.025 4 0.000 7 0.282 776 0.000 032 0.282 772 0.1 6.9 669 888
      02TW1.11 312 0.055 3 0.001 7 0.283 100 0.000 028 0.283 091 11.6 18.1 218 163
      02TW1.12 309 0.020 1 0.000 5 0.283 121 0.000 033 0.283 119 12.4 19.1 181 101
      02TW1.13 311 0.027 4 0.000 9 0.283 211 0.000 036 0.283 206 15.5 22.2 56 -101
      02TW1.14 310 0.035 3 0.000 9 0.282 956 0.000 027 0.282 950 6.5 13.1 419 485
      02TW1.15 311 0.020 1 0.000 6 0.282 972 0.000 023 0.282 968 7.1 13.8 393 444
      02TW1.16 312 0.029 1 0.000 8 0.283 002 0.000 025 0.282 997 8.1 14.8 353 378
      7218.1 318 0.035 4 0.001 0 0.282 837 0.000 020 0.282 831 2.3 9.1 589 753
      7218.2 316 0.097 8 0.002 4 0.282 986 0.000 032 0.282 972 7.6 14.0 392 433
      7218.3 317 0.086 9 0.002 3 0.282 879 0.000 026 0.282 865 3.8 10.3 548 675
      7218.4 318 0.051 5 0.001 6 0.282 918 0.000 027 0.282 909 5.2 11.8 481 575
      7218.5 318 0.084 9 0.002 6 0.282 824 0.000 025 0.282 808 1.8 8.3 634 803
      7218.6 319 0.048 4 0.001 9 0.282 848 0.000 026 0.282 837 2.7 9.3 586 737
      7218.7 318 0.064 7 0.002 0 0.282 824 0.000 023 0.282 812 1.8 8.4 623 794
      7218.8 319 0.039 4 0.001 2 0.282 841 0.000 022 0.282 834 2.4 9.2 586 745
      7218.9 319 0.055 4 0.001 8 0.282 890 0.000 023 0.282 880 4.2 10.8 523 640
      7218.10 317 0.055 4 0.001 9 0.282 791 0.000 024 0.282 780 0.7 7.3 669 868
      7218.11 318 0.073 6 0.002 1 0.282 830 0.000 025 0.282 818 2.1 8.6 616 782
      7218.12 321 0.040 1 0.001 3 0.282 856 0.000 020 0.282 848 3.0 9.8 566 711
      7218.13 320 0.045 7 0.001 2 0.282 865 0.000 022 0.282 858 3.3 10.1 552 689
      7218.14 318 0.052 5 0.001 6 0.282 840 0.000 020 0.282 831 2.4 9.1 593 753
      7218.15 317 0.049 3 0.001 4 0.282 933 0.000 025 0.282 924 5.7 12.4 458 541
      7218.16 319 0.062 8 0.001 8 0.282 858 0.000 028 0.282 848 3.1 9.7 569 713
      注:测试单位为天津地质矿产研究所实验室
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