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    北秦岭超高压榴辉岩中长英质脉体的锆石U-Pb年龄及其地质意义

    何宇 赵宇洁 张文祥 王浩 周光颜 吴元保

    何宇, 赵宇洁, 张文祥, 王浩, 周光颜, 吴元保, 2018. 北秦岭超高压榴辉岩中长英质脉体的锆石U-Pb年龄及其地质意义. 地球科学, 43(2): 389-400. doi: 10.3799/dqkx.2017.597
    引用本文: 何宇, 赵宇洁, 张文祥, 王浩, 周光颜, 吴元保, 2018. 北秦岭超高压榴辉岩中长英质脉体的锆石U-Pb年龄及其地质意义. 地球科学, 43(2): 389-400. doi: 10.3799/dqkx.2017.597
    He Yu, Zhao Yujie, Zhang Wenxiang, Wang Hao, Zhou Guangyan, Wu Yuanbao, 2018. Zircon U-Pb Ages of A Felsic Vein in Ultrahigh-Pressure Eclogite from North Qinling Terrane and Their Geological Implications. Earth Science, 43(2): 389-400. doi: 10.3799/dqkx.2017.597
    Citation: He Yu, Zhao Yujie, Zhang Wenxiang, Wang Hao, Zhou Guangyan, Wu Yuanbao, 2018. Zircon U-Pb Ages of A Felsic Vein in Ultrahigh-Pressure Eclogite from North Qinling Terrane and Their Geological Implications. Earth Science, 43(2): 389-400. doi: 10.3799/dqkx.2017.597

    北秦岭超高压榴辉岩中长英质脉体的锆石U-Pb年龄及其地质意义

    doi: 10.3799/dqkx.2017.597
    基金项目: 

    国家自然科学基金项目 41273035

    国家重点基础研究发展计划("973"计划)项目 2015CB856106

    国家自然科学基金项目 41625008

    国家自然科学基金项目 41173016

    详细信息
      作者简介:

      何宇(1994-), 男, 硕士研究生, 主要从事造山带地球化学方面的研究.

      通讯作者:

      吴元保

    • 中图分类号: P597

    Zircon U-Pb Ages of A Felsic Vein in Ultrahigh-Pressure Eclogite from North Qinling Terrane and Their Geological Implications

    • 摘要: 北秦岭地区的早古生代超高压变质作用是整个秦岭-桐柏-红安-大别-苏鲁造山带内最古老的超高压变质记录, 代表华南与华北板块之间最早的一期增生碰撞事件, 然而目前对于该地区早古生代的构造演化过程仍存在较大争议.对北秦岭官坡超高压榴辉岩中的一个长英质脉体开展了详细的锆石形态学、微量元素和U-Pb年代学研究.结果表明, 脉体中的锆石呈自形的棱柱状晶形, 发育弱的振荡环带、面状分带或无明显分带特征, 具有高的HREE、Y、U含量, 低的Th含量和Th/U比值, 说明锆石生长自含水熔体.另外, 这些变质锆石具有LREE亏损、HREE相对富集的配分模式以及明显的Eu负异常, 表明含水熔体形成于角闪岩相退变质过程.锆石的206Pb/238U加权平均年龄为494±10 Ma (MSWD=2.2), 与北秦岭超高压变质作用的峰期年龄(490.4±5.8 Ma)在误差范围内基本一致.北秦岭地体经历深俯冲作用之后发生快速折返, 并在折返过程中发生角闪岩相退变质作用诱发俯冲板片部分熔融产生含水熔体.

       

    • 图  1  北秦岭地区地质简图

      NQ.北秦岭地区, SQ.南秦岭地区, TB.桐柏地区, HA.红安地区, DB.大别地区, SL.苏鲁地区; 据Wang et al.(2014)修改

      Fig.  1.  Geological sketch of the North Qinling terrane

      图  2  北秦岭长英质脉样品11QL98野外及显微结构照片

      Mus.白云母; Qtz.石英; Pl.斜长石

      Fig.  2.  Field photographs and micrographs of felsic vein 11QL98 in the North Qinling terrane

      图  3  北秦岭长英质脉样品11QL98中典型锆石的阴极发光图像

      Fig.  3.  CL images of typical zircon crystals in felsic vein 11QL98 in the North Qinling terrane

      图  4  北秦岭长英质脉样品11QL98锆石U-Pb年龄谐和图

      Fig.  4.  The concordia diagram for U-Pb ages of zircon grains in felsic vein 11QL98 from the North Qinling terrane

      图  5  北秦岭长英质脉样品11QL98锆石球粒陨石标准化稀土元素配分模式

      球粒陨石标准化值据McDonough and Sun(1995)

      Fig.  5.  The chondrite-normalized REE pattern of zircon grains in felsic vein 11QL98 from the North Qinling terrane

      表  1  北秦岭长英质脉样品11QL98 SIMS锆石U-Pb年龄测定结果

      Table  1.   Zircon U-Pb isotopic data obtained by SIMS for felsic vein 11QL98 from the North Qinling terrane

      分析点 U(10-6) Th(10-6) Th/U f206(%) 207Pb/206Pb ±σ(Ma)(%) 207Pb/235U ±σ(Ma)(%) 206Pb/238U ±σ(Ma)(%) 207Pb/206Pb ±σ(Ma) 207Pb/235U ±σ(Ma) 206Pb/238U ±σ(Ma)
      1 704 1.44 0.002 0.14 0.056 08 1.45 0.529 24 2.11 0.068 4 1.53 455.4 31.9 431.3 7.4 426.8 6.3
      2 3 130 20.4 0.007 0.72 0.056 62 1.06 0.584 30 1.85 0.074 9 1.51 476.6 23.3 467.2 6.9 465.3 6.8
      3 1 862 5.38 0.003 0.20 0.057 60 0.74 0.615 33 1.67 0.077 5 1.50 514.4 16.2 486.9 6.5 481.1 7.0
      4 2 576 2.29 0.001 0.39 0.056 85 0.86 0.615 13 1.73 0.078 5 1.50 485.8 18.8 486.8 6.7 487.0 7.0
      5 1 332 26.0 0.020 0.08 0.057 34 0.78 0.622 88 1.69 0.078 8 1.50 504.6 17.0 491.7 6.6 488.9 7.1
      6 298 0.48 0.002 0.05 0.056 35 1.52 0.616 52 2.13 0.079 4 1.50 466.0 33.2 487.7 8.3 492.3 7.1
      7 3 018 4.14 0.001 0.02 0.056 98 0.53 0.632 25 1.59 0.080 5 1.50 490.9 11.7 497.5 6.3 498.9 7.2
      8 1 873 44.0 0.023 0.11 0.056 93 0.67 0.640 58 1.64 0.081 6 1.50 488.9 14.7 502.7 6.5 505.7 7.3
      9 4 797 10.4 0.002 0.21 0.057 39 0.53 0.653 35 1.59 0.082 6 1.50 506.4 11.6 510.5 6.4 511.5 7.4
      下载: 导出CSV

      表  2  北秦岭长英质脉样品11QL98中锆石微量元素(10-6)分析结果

      Table  2.   Trace elements (10-6) analyses for zircon in felsic vein 11QL98 from the North Qinling terrane

      分析点 Y Nb La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta Th U Ti T(℃) ∑REE ∑HREE (Yb/Gd)N δEu
      1 2 955 2.29 2.75 10.1 1.45 8.99 6.67 3.08 46.6 20.5 248 87.8 381 73.0 707 126 17 838 1.70 45.9 2 484 17.3 800 1 723 1 690 18.8 0.39
      2 471 0.96 1.35 5.24 0.98 5.85 3.38 3.43 6.65 2.44 30.8 13.6 75.0 18.5 214 48.2 11 456 0.33 5.35 1 062 6.20 703 429 409 39.8 2.17
      3 997 0.72 0.18 0.83 0.11 0.79 0.67 0.33 5.15 3.07 55.2 27.9 161 39.2 471 105 14 487 0.27 2.41 1480 4.00 667 870 868 113 0.39
      4 82.3 0.17 0.09 0.54 0.13 0.50 0.70 0.23 1.63 0.47 6.17 2.29 11.0 2.45 29.0 6.10 14 033 0.19 1.81 632 2.84 640 61.3 59.1 22.0 0.64
      5 1 804 1.19 0.97 5.31 0.57 3.94 3.12 4.27 31.1 12.9 150 52.9 241 50.8 517 97.1 13 673 0.80 19.5 820 11.5 760 1 171 1 153 20.5 0.86
      6 1 780 0.92 0.21 2.31 0.23 1.42 2.12 1.70 23.1 10.8 139 52.3 243 50.1 527 103 13 494 0.78 16.9 705 11.1 756 1 156 1 148 28.1 0.46
      7 1 025 0.83 1.11 4.65 0.60 5.52 2.49 1.51 8.96 3.99 62.6 29.6 167 43.1 528 116 13 147 0.32 6.71 1 341 7.04 714 975 959 72.8 0.87
      注:†T值据Ferry and Watson (2007)锆石中Ti含量温度计计算.
      下载: 导出CSV
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    • 收稿日期:  2017-10-24
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