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    冈底斯印支晚期后碰撞花岗岩: 锆石U-Pb年代学及岩石地球化学证据

    王程 魏启荣 刘小念 丁鹏飞 卜涛 孙骥 张小强 王敬元

    王程, 魏启荣, 刘小念, 丁鹏飞, 卜涛, 孙骥, 张小强, 王敬元, 2014. 冈底斯印支晚期后碰撞花岗岩: 锆石U-Pb年代学及岩石地球化学证据. 地球科学, 39(9): 1277-1288, 1300. doi: 10.3799/dqkx.2014.109
    引用本文: 王程, 魏启荣, 刘小念, 丁鹏飞, 卜涛, 孙骥, 张小强, 王敬元, 2014. 冈底斯印支晚期后碰撞花岗岩: 锆石U-Pb年代学及岩石地球化学证据. 地球科学, 39(9): 1277-1288, 1300. doi: 10.3799/dqkx.2014.109
    Wang Cheng, Wei Qirong, Liu Xiaonian, Ding Pengfei, Bu Tao, Sun Ji, Zhang Xiaoqiang, Wang Jingyuan, 2014. Post-Collision Related Late Indosinian Granites of Gangdise Terrane: Evidences from Zircon U-Pb Geochronology and Petrogeochemistry. Earth Science, 39(9): 1277-1288, 1300. doi: 10.3799/dqkx.2014.109
    Citation: Wang Cheng, Wei Qirong, Liu Xiaonian, Ding Pengfei, Bu Tao, Sun Ji, Zhang Xiaoqiang, Wang Jingyuan, 2014. Post-Collision Related Late Indosinian Granites of Gangdise Terrane: Evidences from Zircon U-Pb Geochronology and Petrogeochemistry. Earth Science, 39(9): 1277-1288, 1300. doi: 10.3799/dqkx.2014.109

    冈底斯印支晚期后碰撞花岗岩: 锆石U-Pb年代学及岩石地球化学证据

    doi: 10.3799/dqkx.2014.109
    基金项目: 

    中国地质调查局西藏则学地区矿产远景调查项目 1212011086040

    详细信息
      作者简介:

      王程(1988-), 男, 硕士在读研究生, 主要从事岩浆岩与成矿研究.E-mail: wangcheng607@126.com

      通讯作者:

      魏启荣, E-mail: weiqr1030@cug.edu.cn

    • 中图分类号: P597

    Post-Collision Related Late Indosinian Granites of Gangdise Terrane: Evidences from Zircon U-Pb Geochronology and Petrogeochemistry

    • 摘要: 对出露在冈底斯中带的达布拉岩体进行了系统的岩石学研究、LA-ICP-MS锆石U-Pb定年、岩石地球化学分析、Sr-Nd-Pb同位素组成的讨论.结果显示, 达布拉岩体的岩石类型为二长花岗岩, 由中细粒的边缘相和中粗粒的中央相组成, 成岩年龄为230.6±4.3 Ma~228.2±3.5 Ma, 属晚三叠世.岩体具高Si(w(SiO2)=71.79%~77.27%)、高K(w(K2O)=4.06%~5.26%)、低Ti(w(TiO2)=0.06%~0.40%)含量特征, 铝饱和指数(A/CNK)为1.16~1.19, 为强过铝质花岗岩, 负铕异常显著(Eu/Eu*=0.06~0.35), 强烈富集Rb、Th和亏损Ba、Nb、Sr、P、Ti.同位素组成上具高(87Sr/86Sr)i值(0.712 7~0.720 1)、低εNd(t)值(-10.6)、高放射成因Pb特征.达布拉岩体为澳大利亚大陆北缘与拉萨地块汇聚碰撞触发的班公湖-怒江洋壳岩石圈南向俯冲背景下, 在后碰撞伸展阶段由幔源岩浆底侵引发冈底斯成熟地壳物质部分熔融形成的.

       

    • 图  1  研究区地质略图

      Fig.  1.  Geological sketch of the study area

      图  2  二长花岗岩体野外特征和显微结构特征

      Qz.石英;Pl.斜长石;Kfs.钾长石;Bi.黑云母;Ms.白云母;a.二长花岗岩体的野外露头;b.二长花岗岩体的长石斑晶;c, d.二长花岗岩显微结构特征(+)

      Fig.  2.  Field photos and photomicrograph features of adamellite pluton

      图  3  达布拉岩体的锆石阴极发光电子图像

      Fig.  3.  CL image of zircon of Dabula pluton

      图  4  达布拉岩体的锆石U-Pb年龄谐和图

      Fig.  4.  Zircon U-Pb concordia diagram of Dabula pluton

      图  5  达布拉岩体的SiO2-(Na2O+K2O)分类(a)和SiO2-K2O关系(b)

      a图据Cox et al., 1979;b图据Peccerillo and Taylor, 1976;1.橄榄辉长岩;2.辉长岩;3.辉长闪长岩;4.闪长岩;5.花岗闪长岩;6.花岗岩;7.二长辉长岩;8.二长闪长岩;9.二长岩;10.石英二长岩;11.正长岩;12.似长辉长岩;13.似长二长闪长岩;14.似长正长闪长岩;15.似长正长岩;16.似长岩;Ir-Irvine分界线、岩石系列划分据Irvine and Baragar(1971);A.碱性系列;S.亚碱性系列

      Fig.  5.  SiO2-(Na2O+K2O) classification (a) and relation of SiO2-K2O (b) of Dabula pluton

      图  6  达布拉岩体稀土元素和微量元素蛛网图

      球粒陨石标准化值a图据Sun and McDonough(1989);原始地幔标准化值b图据Sun and McDonough(1989)

      Fig.  6.  REE and trace element spidergram of Dabula pluton

      图  7  达布拉岩体的Sr-Nd同位素关系

      a.据莫宣学等(2005);b.据DePaolo and Wasserburg(1979)

      Fig.  7.  Isotopic relation of Sr-Nd of Dabula pluton

      图  8  达布拉岩体的Pb同位素协变

      图a中拉萨东部基底片麻岩,中部火山岩,西部超钾质岩石数据赵志丹等(2007);图b中3个Pb同位素地球化学端元的划分赵志丹等(2007)

      Fig.  8.  206Pb/204Pb-207Pb/204Pb (a) and 206Pb/204Pb-208Pb/204Pb (b) covariant plot of Dabula pluton

      图  9  达布拉岩体的Yb-Ta和Yb+Ta-Rb构造环境判别(据Pearce et al., 1984)

      syn-COLG.同碰撞花岗岩;WPG.板内花岗岩;ORG.洋脊花岗岩;VAG.岛弧花岗岩

      Fig.  9.  Yb-Ta and Yb+Ta-Rb tectonic setting discrimination of Dabula pluton

      图  10  达布拉岩体的R1-R2构造环境判别(据Batchelor and Bowden, 1985)

      Fig.  10.  R1-R2 tectonic setting discrimination of Dabula pluton

      图  11  达布拉岩体的Rb/Sr-Rb/Ba关系(据Sylvester, 1998)

      Fig.  11.  Relation of Rb/Sr-Rb/Ba of Dabula pluton

      表  1  达布拉岩体LA-ICP-MS锆石U-Pb同位素分析结果

      Table  1.   LA-ICP-MS U-Pb data of zircon of Dabula pluton

      分析点号 Pb(μg/g) Th(μg/g) U(μg/g) Th/U 207Pb*/206Pb* 1σ 207Pb*/235U 1σ 206Pb*/238U 1σ 207Pb/206Pb 207Pb/235U 206Pb/238U
      年龄(Ma) 1σ 年龄(Ma) 1σ 年龄(Ma) 1σ
      样品B1282-2(中细粒二长花岗岩)
      B1282-2-01 34.95 412.95 798.49 0.52 0.051 22 0.001 32 0.260 77 0.006 46 0.036 89 0.000 31 251 41 235 5 234 2
      B1282-2-02 93.99 620.34 2 413.16 0.26 0.050 97 0.000 99 0.249 51 0.004 93 0.035 43 0.000 32 239 29 226 4 224 2
      B1282-2-03 89.37 711.69 2 228.76 0.32 0.050 07 0.000 98 0.254 26 0.005 65 0.036 75 0.000 46 198 29 230 5 233 3
      B1282-2-04 143.54 1 112.59 3 494.02 0.32 0.051 98 0.000 89 0.266 12 0.004 46 0.037 06 0.000 24 284 26 240 4 235 2
      B1282-2-05 83.35 370.63 2 184.34 0.17 0.050 58 0.000 86 0.251 85 0.004 31 0.036 09 0.000 38 222 21 228 3 229 2
      样品B2186-1(中粗粒似斑状二长花岗岩)
      B2186-1-01 481.26 2 109.27 7 966.48 0.26 0.051 93 0.002 04 0.269 96 0.011 17 0.037 41 0.000 53 283 89 243 9 237 3
      B2186-1-02 236.43 1 051.40 3 939.86 0.27 0.051 93 0.001 53 0.265 10 0.008 02 0.036 96 0.000 52 283 69 239 6 234 3
      B2186-1-03 172.48 1 260.05 2 170.51 0.58 0.053 38 0.001 60 0.265 30 0.007 98 0.036 09 0.000 47 346 69 239 6 229 3
      B2186-1-04 590.06 3 301.29 10 916.94 0.30 0.058 64 0.000 90 0.293 94 0.004 77 0.036 33 0.000 38 554 33 262 4 230 2
      B2186-1-05 172.52 1 107.07 1 923.99 0.58 0.054 61 0.002 37 0.264 79 0.013 54 0.034 64 0.000 55 394 103 239 11 220 3
      B2186-1-06 316.93 2 910.98 2 925.26 1.00 0.059 50 0.002 21 0.293 75 0.011 09 0.035 44 0.000 36 587 81 262 9 225 2
      B2186-1-07 478.72 2 400.03 9 842.31 0.24 0.054 51 0.001 59 0.275 05 0.008 31 0.036 28 0.000 52 391 67 247 7 230 3
      B2186-1-08 185.99 954.72 2 564.58 0.37 0.049 15 0.002 09 0.244 78 0.009 62 0.036 20 0.000 57 154 98 222 8 229 4
      B2186-1-09 161.54 937.70 2 041.27 0.46 0.049 94 0.002 13 0.246 35 0.01022 0.035 51 0.000 45 191 94 224 8 225 3
      B2186-1-10 159.22 962.46 1 822.36 0.53 0.049 76 0.001 89 0.248 29 0.009 04 0.036 17 0.000 46 183 117 225 7 229 3
      B2186-1-11 247.26 1 053.51 3 015.08 0.35 0.053 89 0.001 92 0.266 12 0.00927 0.035 53 0.000 43 365 86 240 7 225 3
      B2186-1-12 333.23 2 580.36 4 027.10 0.64 0.065 50 0.001 87 0.327 10 0.009 99 0.035 80 0.000 35 791 60 287 8 227 2
      B2186-1-13 452.05 1 920.20 4 614.38 0.42 0.054 45 0.001 38 0.280 00 0.007 43 0.037 09 0.000 47 391 62 251 6 235 3
      注: Pb*代表放射性铅.
      下载: 导出CSV

      表  2  达布拉岩体主量元素分析结果(%)

      Table  2.   Major elements result of Dabula pluton

      样号 岩石名称 SiO2 TiO2 Al2O3 Fe2O3 FeO MnO MgO CaO Na2O K2O P2O5 H2O+ CO2 总量
      B2186-1 中粗粒似斑状二长花岗岩 72.02 0.29 13.83 0.27 2.00 0.05 0.64 0.90 2.85 5.13 0.08 1.08 0.63 99.77
      B2190-1 中粗粒似斑状二长花岗岩 71.89 0.40 12.99 0.98 3.01 0.10 0.86 1.18 2.85 4.06 0.11 1.05 0.21 99.69
      B2190-2 中粗粒似斑状二长花岗岩 71.79 0.36 13.62 0.41 2.57 0.06 0.76 1.11 2.89 4.79 0.10 0.83 0.35 99.64
      B1080-1 中细粒二长花岗岩 77.27 0.06 12.91 0.29 0.10 0.01 0.15 0.13 3.09 5.22 0.02 0.57 0.06 99.88
      B1282-2 中细粒二长花岗岩 75.73 0.07 13.74 0.27 0.25 0.05 0.16 0.25 3.26 5.26 0.06 0.68 0.08 99.86
      注: 分析测试单位为西南冶金地质测试所,下同.
      下载: 导出CSV

      表  3  达布拉岩体稀土元素分析结果(10-6)

      Table  3.   Rare earth elements result of Dabula pluton

      样号 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y ∑REE (La/Yb)N δEu
      B2186-1 53.34 67.48 11.62 45.41 8.97 1.08 9.65 1.27 7.60 1.47 4.48 0.64 2.07 0.61 30.53 215.68 18.49 0.35
      B2190-1 66.92 75.64 15.17 60.19 12.17 0.95 12.74 1.66 10.18 1.87 5.87 0.81 3.31 0.71 40.16 268.19 14.52 0.23
      B2190-2 53.72 73.85 11.47 43.26 8.84 1.01 9.67 1.17 7.30 1.25 3.90 0.52 3.53 0.52 32.86 220.00 10.92 0.33
      B1080-1 12.62 29.22 3.66 13.13 4.22 0.09 4.35 0.91 6.42 1.32 4.22 0.76 5.51 0.80 43.46 87.25 1.64 0.06
      B1282-2 15.44 32.87 3.73 13.14 3.68 0.26 4.08 0.86 6.42 1.33 4.13 0.70 4.86 0.69 43.97 92.18 2.28 0.21
      下载: 导出CSV

      表  4  达布拉岩体微量元素分析结果(10-6)

      Table  4.   Trace elements result of Dabula pluton

      样号 Rb Sr Ba U Th Nb Ta Zr Hf Sc V Cr Co Ni Cu Zn Pb
      B2186-1 396.00 107.70 297.50 3.86 41.99 12.44 4.05 130.89 8.18 6.07 23.91 180.60 4.62 5.93 54.16 149.10 189.30
      B2190-1 315.30 100.80 264.20 14.50 76.19 12.23 4.33 212.56 13.16 9.10 34.13 310.80 6.96 6.88 75.00 277.10 1 405.00
      B2190-2 356.00 109.80 285.10 9.62 57.65 10.96 3.35 176.48 10.78 7.55 30.07 211.70 5.04 7.55 42.23 74.12 220.30
      B1080-1 733.40 13.64 69.20 5.97 10.80 0.73 1.75 33.95 2.21 2.20 1.35 12.90 0.65 1.11 1.38 5.37 83.02
      B1282-2 539.40 34.97 105.60 5.24 17.95 5.32 2.89 43.75 2.17 1.97 2.93 15.56 0.48 1.10 1.62 148.40 89.98
      下载: 导出CSV

      表  5  达布拉岩体全岩Sr-Nd同位素组成

      Table  5.   Sr-Nd isotopic data of Dabula pluton

      样号 Rb(10-6) Sr(10-6) 87Rb/86Sr 87Sr/86Sr (87Sr/86Sr)i εSr(t)
      B2186-1 396.0 107.7 10.687 134 0.754 802±7 0.720 1 225.5
      B2190-1 315.3 100.8 9.082 641 0.744 567±9 0.715 1 154.2
      B2190-2 356.0 109.8 9.413 236 0.743 210±5 0.712 7 119.6
      样号 Sm(10-6) Nd(10-6) 147Sm/144Nd 143Nd/144Nd (143Nd/144Nd)i εNd(t)
      B2186-1 8.97 45.41 0.119 426 0.511 977±10 0.511 8 -10.6
      B2190-1 12.17 60.19 0.122 193 0.511 982±7 0.511 8 -10.6
      B2190-2 8.84 43.26 0.123 587 0.511 984±7 0.511 8 -10.6
      注: 分析测试单位为中国地质大学(武汉)地质过程与矿产资源国家重点实验室,下同;t=228.2 Ma.
      下载: 导出CSV

      表  6  达布拉岩体全岩Pb同位素组成

      Table  6.   Pb isotopic data of Dabula pluton

      样号 206Pb/204Pb 207Pb/204Pb 208Pb/204Pb
      B2186-1 18.801 4±0.000 4 15.753 6±0.000 4 39.413 5±0.001 0
      B2190-1 19.216 3±0.000 3 15.781 9±0.000 3 39.896 4±0.000 7
      B2190-2 19.035 6±0.000 4 15.772 5±0.000 3 39.737 6±0.001 0
      下载: 导出CSV
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