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    东秦岭南召县五朵山岩体二云母花岗岩地球化学、锆石U-Pb年代学及地质意义

    李开文 方怀宾 郭君功 刘坤 赵焕 王小娟

    李开文, 方怀宾, 郭君功, 刘坤, 赵焕, 王小娟, 2019. 东秦岭南召县五朵山岩体二云母花岗岩地球化学、锆石U-Pb年代学及地质意义. 地球科学, 44(1): 123-134. doi: 10.3799/dqkx.2018.306
    引用本文: 李开文, 方怀宾, 郭君功, 刘坤, 赵焕, 王小娟, 2019. 东秦岭南召县五朵山岩体二云母花岗岩地球化学、锆石U-Pb年代学及地质意义. 地球科学, 44(1): 123-134. doi: 10.3799/dqkx.2018.306
    Li Kaiwen, Fang Huaibin, Guo Jungong, Liu Kun, Zhao Huan, Wang Xiaojuan, 2019. Petrogeochemistry, Zircon U-Pb Dating and Geological Significance of Two-Mica Granites from Wuduoshan Granite in Nanzhao County, Eastern Qinling Mountains. Earth Science, 44(1): 123-134. doi: 10.3799/dqkx.2018.306
    Citation: Li Kaiwen, Fang Huaibin, Guo Jungong, Liu Kun, Zhao Huan, Wang Xiaojuan, 2019. Petrogeochemistry, Zircon U-Pb Dating and Geological Significance of Two-Mica Granites from Wuduoshan Granite in Nanzhao County, Eastern Qinling Mountains. Earth Science, 44(1): 123-134. doi: 10.3799/dqkx.2018.306

    东秦岭南召县五朵山岩体二云母花岗岩地球化学、锆石U-Pb年代学及地质意义

    doi: 10.3799/dqkx.2018.306
    基金项目: 

    中国地质调查局地质矿产调查项目 DD20160043

    中国地质调查局地质矿产调查项目 12120114027001

    详细信息
      作者简介:

      李开文(1984-), 男, 工程师, 主要从事区域地质矿产调查工作

    • 中图分类号: P581

    Petrogeochemistry, Zircon U-Pb Dating and Geological Significance of Two-Mica Granites from Wuduoshan Granite in Nanzhao County, Eastern Qinling Mountains

    • 摘要: 秦岭造山带地处华北板块与扬子板块结合带,经历了复杂的构造演化过程,其板块拼合机制及碰撞时限一直备受争议.对东秦岭南召县五朵山岩体二云母花岗岩进行岩石地球化学和LA-ICP-MS锆石U-Pb年代学研究,结果表明岩石具有高硅(SiO2=69.32%~74.28%)、高铝(Al2O3=14.14~17.28)、高碱含量(Na2O+K2O=7.68%~9.03%)等特征,且相对富钾贫钠,在岩石类型上属于强过铝质"S"型花岗岩类.岩石具有中等的稀土元素含量,呈现轻稀土富集、重稀土亏损的右倾配分模式,中等的负Eu异常,富集K、Rb、Th等大离子亲石元素,亏损Ba、Nb、Sr、P、Ti等元素,表明南召县二云母花岗岩可能形成于陆陆碰撞所导致的陆壳加厚环境.LA-ICP-MS锆石U-Pb分析结果表明,二云母花岗岩锆石均具有明显的韵律环带,Th/U比值均大于0.4,暗示岩浆成因特征,206Pb/238U加权平均年龄为433±2 Ma;结合构造环境特征,表明东秦岭南召地区在早志留世末期由俯冲环境转换为陆陆碰撞环境.

       

    • 图  1  研究区地质简图

      张国伟等(2001)修改

      Fig.  1.  Schematic geological map of study area

      图  2  二云母花岗岩野外及镜下照片(正交偏光)

      Q.石英;Pl.斜长石;Kf.钾长石;Bt.黑云母;Ms.白云母

      Fig.  2.  Filed photographs and microphotographs for two-mica granite (cross polarized light)

      图  3  研究区二云母花岗岩SiO2-K2O图解(a)和A/CNK-A/NK图解(b)

      图a据Peccerillo and Taylor(1976);图b据Maniar and Piccoli(1989)

      Fig.  3.  Plot of SiO2 vs. K2O (a) and A/CNK vs. A/NK in the study area (b)

      图  4  研究区二云母花岗岩稀土元素球粒陨石标准化配分图(a)和微量元素原始地幔蛛网图(b)

      标准化值据Sun and McDonough(1989)

      Fig.  4.  Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace elements spider (b)

      图  5  研究区二云母花岗岩锆石CL图像

      Fig.  5.  CL images of zircons from two-mica granite in the study area

      图  6  研究区二云母花岗岩锆石U-Pb年龄谐和图

      Fig.  6.  Zircon U-Pb concordia diagram for two-mica granite in the study area

      图  7  南召县二云母花岗岩A(Al-Na-K)-C(Ca)-F(Mg+Fe2+)图解

      White and Chappell(1977)

      Fig.  7.  Plot of A(Al-Na-K)-C(Ca)-F(Mg+Fe2+) of the two-mica granite from the Nanzhao County

      图  8  研究区二云母花岗岩微量元素构造判别图

      Fig.  8.  Tectonic environment discrimination diagrams for two-mica granites

      图  9  研究区二云母花岗岩R1-R2构造判别图解

      Batchelor and Bowden(1985)

      Fig.  9.  R1-R2 tectonic discrimination diagram for two-mica granites

      表  1  南召县二云母花岗岩主量元素(%)、微量元素及稀土元素(10-6)分析结果

      Table  1.   Major (%), trace elements and rare earth elements (10-6) compositions for two-mica granites in Nanzhao County

      样品号 005/7 006/3 1038/3 2021/1 209/4 210/1 6010/1
      SiO2 70.13 70.55 74.28 72.07 70.17 72.37 69.32
      TiO2 0.14 0.18 0.06 0.14 0.22 0.25 0.29
      Al2O3 17.28 16.18 14.64 15.58 14.14 14.34 15.41
      Fe2O3 0.45 0.59 0.23 0.77 3.14 1.17 1.72
      FeO 0.57 0.80 0.38 0.35 1.83 1.15 1.52
      MnO 0.13 0.05 0.04 0.05 0.08 0.09 0.13
      MgO 0.23 0.36 0.13 0.26 0.18 0.46 0.82
      CaO 0.48 1.46 1.08 1.07 1.07 1.44 1.29
      Na2O 4.69 4.58 4.24 3.83 2.94 3.23 3.38
      K2O 4.34 3.80 4.03 4.49 5.22 4.45 4.30
      P2O5 0.05 0.06 0.04 0.07 0.10 0.11 0.15
      LOI 1.24 1.07 0.64 1.06 0.50 0.55 1.28
      H2O+ 1.24 1.20 0.64 1.01 0.63 0.36 1.27
      Total 99.75 99.68 99.79 99.74 99.58 99.59 99.61
      A/CNK 1.30 1.13 1.10 1.19 1.14 1.12 1.22
      Rb 217.8 153.2 165.6 168.6 156.8 184.9 143.5
      Ba 538.7 808.0 430.5 714.4 813.6 1386 809.1
      Th 8.16 10.26 13.39 9.95 47.49 21.15 8.55
      U 1.20 1.45 1.09 1.27 2.10 1.05 1.11
      Ta 1.71 1.62 1.37 1.21 0.61 0.96 1.12
      Nb 11.88 10.75 9.19 9.32 5.31 8.50 9.32
      Sr 243.1 420.5 224.4 363.5 186.9 316.1 305.0
      Hf 3.4 3.7 2.5 3.1 5.6 4.8 3.12
      Zr 72.6 95.2 42.3 72.4 210.3 177.0 110.7
      La 11.93 17.67 8.52 13.65 67.52 32.72 28.27
      Ce 22.99 31.91 16.22 26.79 132.3 56.55 52.76
      Pr 2.74 3.71 1.80 3.00 13.00 6.68 6.83
      Nd 9.72 13.25 6.57 10.71 42.94 22.58 24.87
      Sm 2.25 2.43 1.42 2.21 7.85 3.96 4.83
      Eu 0.44 0.60 0.36 0.58 0.86 0.87 1.07
      Gd 1.91 1.88 1.40 1.81 6.80 3.37 3.51
      Tb 0.34 0.27 0.27 0.31 0.96 0.52 0.56
      Dy 1.86 1.28 1.74 1.53 4.52 2.74 2.85
      Ho 0.33 0.21 0.34 0.26 0.83 0.57 0.52
      Er 0.84 0.53 0.99 0.70 2.13 1.54 1.36
      Tm 0.12 0.08 0.15 0.10 0.27 0.22 0.21
      Yb 0.78 0.48 0.87 0.60 1.75 1.38 1.24
      Lu 0.11 0.07 0.13 0.09 0.25 0.20 0.18
      Y 9.71 6.28 10.91 7.71 21.90 15.64 15.22
      δEu 0.62 0.83 0.78 0.86 0.35 0.71 0.76
      总和 66.08 80.65 51.70 70.05 303.84 149.53 144.28
      下载: 导出CSV

      表  2  南召县下桐扒二云母花岗岩LA-ICP-MS锆石U-Pb年龄测试数据

      Table  2.   LA-ICP-MS zircon dating results for two-mica granite in Nanzhao County

      点号 U(10-6) Th(10-6) Th/U 同位素比值 年龄(Ma) 谐和度
      (%)
      207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ
      1 1 249 1 240 0.99 0.056 5 0.000 9 0.543 2 0.010 2 0.069 8 0.000 7 471 36 441 8 435 4 99
      2 184 195 1.06 0.056 3 0.001 1 0.541 1 0.011 6 0.069 7 0.000 7 463 45 439 9 435 4 99
      3 658 406 0.62 0.057 0 0.000 9 0.552 0 0.009 2 0.070 2 0.000 8 493 33 446 7 438 5 98
      4 485 219 0.45 0.055 7 0.000 9 0.528 8 0.009 2 0.068 9 0.000 7 439 36 431 7 430 4 100
      5 517 535 1.04 0.056 3 0.000 9 0.529 2 0.008 9 0.068 2 0.000 7 464 35 431 7 425 4 99
      6 1 299 633 0.49 0.056 7 0.000 8 0.540 5 0.008 5 0.069 1 0.000 7 481 32 439 7 431 4 98
      7 325 176 0.54 0.055 9 0.001 0 0.542 0 0.010 4 0.070 2 0.000 7 450 40 440 8 438 4 100
      8 371 194 0.52 0.056 3 0.001 0 0.543 9 0.010 0 0.070 1 0.000 7 463 38 441 8 437 4 99
      9 534 328 0.61 0.056 5 0.000 9 0.547 3 0.009 9 0.070 2 0.000 7 470 36 443 8 437 4 99
      10 588 90 0.15 0.056 9 0.000 9 0.543 5 0.009 1 0.069 3 0.000 7 488 34 441 7 432 4 98
      11 1 448 607 0.42 0.055 8 0.000 8 0.539 6 0.008 5 0.070 1 0.000 7 446 32 438 7 437 4 100
      12 1 421 591 0.42 0.056 6 0.000 8 0.545 6 0.008 5 0.069 9 0.000 7 476 32 442 7 436 4 99
      13 304 194 0.64 0.056 4 0.001 3 0.540 4 0.013 7 0.069 1 0.000 7 469 50 439 11 431 5 98
      14 337 135 0.40 0.056 6 0.001 0 0.539 8 0.010 3 0.069 2 0.000 7 474 40 438 8 431 4 98
      15 996 418 0.42 0.056 8 0.000 8 0.545 6 0.008 6 0.069 6 0.000 7 482 32 442 7 434 4 98
      16 802 337 0.42 0.056 5 0.000 8 0.539 0 0.008 7 0.069 0 0.000 7 471 33 438 7 430 4 98
      17 1 062 475 0.45 0.055 7 0.000 8 0.532 8 0.008 6 0.069 1 0.000 7 439 33 434 7 431 4 99
      下载: 导出CSV
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