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    西藏甲鲁朗地区叶巴组火山岩成因及其对新特提斯洋俯冲的约束

    宋宇航 解超明 范建军 曾孝文 郝宇杰 李晓波

    宋宇航, 解超明, 范建军, 曾孝文, 郝宇杰, 李晓波, 2019. 西藏甲鲁朗地区叶巴组火山岩成因及其对新特提斯洋俯冲的约束. 地球科学, 44(7): 2319-2338. doi: 10.3799/dqkx.2019.147
    引用本文: 宋宇航, 解超明, 范建军, 曾孝文, 郝宇杰, 李晓波, 2019. 西藏甲鲁朗地区叶巴组火山岩成因及其对新特提斯洋俯冲的约束. 地球科学, 44(7): 2319-2338. doi: 10.3799/dqkx.2019.147
    Song Yuhang, Xie Chaoming, Fan Jianjun, Zeng Xiaowen, Hao Yujie, Li Xiaobo, 2019. Petrogenesis of Volcanic Rocks from the Yeba Formation in Jialulang Area, Tibet and Its Constraints on the Subduction of Neo-Tethyan Oceanic Slab. Earth Science, 44(7): 2319-2338. doi: 10.3799/dqkx.2019.147
    Citation: Song Yuhang, Xie Chaoming, Fan Jianjun, Zeng Xiaowen, Hao Yujie, Li Xiaobo, 2019. Petrogenesis of Volcanic Rocks from the Yeba Formation in Jialulang Area, Tibet and Its Constraints on the Subduction of Neo-Tethyan Oceanic Slab. Earth Science, 44(7): 2319-2338. doi: 10.3799/dqkx.2019.147

    西藏甲鲁朗地区叶巴组火山岩成因及其对新特提斯洋俯冲的约束

    doi: 10.3799/dqkx.2019.147
    基金项目: 

    自然资源部东北亚矿产资源评价重点实验室自主课题基金项目 DBY-ZZ-18-06

    中国地质调查局项目 DD20160015

    国家自然科学基金项目 41602230

    国家自然科学基金项目 41872231

    中国地质调查局项目 DD20160026

    详细信息
      作者简介:

      宋宇航(1995-), 男, 硕士研究生, 构造地质学专业

      通讯作者:

      解超明

    • 中图分类号: P548

    Petrogenesis of Volcanic Rocks from the Yeba Formation in Jialulang Area, Tibet and Its Constraints on the Subduction of Neo-Tethyan Oceanic Slab

    • 摘要: 西藏冈底斯岩浆弧叶巴组火山岩对于新特提斯洋俯冲时限的制约存在着重要的意义.通过对甲鲁朗地区叶巴组凝灰岩的LA-ICP-MS锆石U-Pb年龄和岩石地球化学组成的研究,锆石测年获得3件凝灰岩样品206Pb/238U年龄加权平均值分别为207.8±1.6 Ma、204.8±1.7 Ma和209.3±3.4 Ma,结合古生物化石证据,表明其形成于晚三叠世;凝灰岩样品富集轻稀土元素和大离子亲石元素(Rb、K、Th、U、Pb),亏损重稀土元素和高场强元素(Nb、Ta、Ti、P),同时亏损Sr元素,Eu负异常较明显.岩石地球化学特征表明叶巴组中酸性岩可能为壳幔混染成因.综合前人研究成果,认为叶巴组形成于新特提斯洋俯冲环境下的大陆边缘弧,新特提斯洋的俯冲从晚三叠世就已经开始.本研究为叶巴组的形成时代以及动力学背景提供了新的制约.

       

    • 图  1  西藏冈底斯岩浆岩分布简图及研究区叶巴组火山岩地质简图

      图据黄丰等(2015)修改;图a中:JSSZ.西金乌兰-金沙江板块缝合带;LSSZ.龙木措-双湖-澜沧江板块缝合带;BNSZ.班公湖-怒江板块缝合带;SNMZ.狮泉河–纳木错蛇绿混杂岩带;IYZSZ.印度河-雅鲁藏布江板块缝合带;图b中:1.早侏罗世叶巴组;2.中新世达弄多组;3.中新世石英二长斑岩;4.中新世石英斑岩;5.中新世二长花岗岩;6.早侏罗世花岗闪长岩;7.早侏罗世二长花岗岩;8.推测断层;9.角岩化带;10.剖面位置;11采样位置及编号;12.本文获得年龄

      Fig.  1.  The simplified distribution map of magmatic rocks on Gangdese and simplified geological map of volcanic rocks of Yeba Formation in researched area, Tibet

      图  2  叶巴组实测剖面

      Fig.  2.  A measured sectional view for the Yeba Formation

      图  3  甲鲁朗地区叶巴组火山岩样品野外及镜下照片

      Pl.斜长石;Cry.晶屑;Q.石英

      Fig.  3.  Outcrop photos and microscopic pictures of typical rock assemblage of volcanic rocks from Yeba Formation in Jialulang area

      图  4  甲鲁朗地区叶巴组火山岩锆石U-Pb年龄谐和图、CL图像及稀土元素球粒陨石标准化配分图

      图中比例尺为100 μm;标准化数据引自Sun and McDonough (1989).

      Fig.  4.  Zircon U-Pb concordia diagrams and CL images and chondrite-normalized REE patterns of zircons for the Yeba Formation volcanic rocks in Jialulang area

      图  5  叶巴组火山岩分类图

      a. TAS图解;b. A/CNK-A/NK图解;c. AFM图解;d. (La/Yb)N-(Yb)N图解;文献数据耿全如等(2005)董彦辉等(2006)Zhu et al.(2008)曾忠诚等(2009)陈炜等(2009)熊秋伟等(2015)Wei et al.(2017)

      Fig.  5.  Classification diagram for the Yeba Formation volcanic rocks

      图  6  叶巴组火山岩球粒陨石标准化稀土元素配分模式图(a、c、e)和原始地幔标准化微量元素蛛网图(b、d、f)

      文献数据同图 5;标准化值据Sun and McDonough (1989)

      Fig.  6.  Chondrite-normalized REE diagram (a, c, e) and primitive mantle-normalized spider diagram (b, d, f) for the volcanic rocks from the Yeba Formation

      图  7  叶巴组双壳类化石

      a~e.拼第嵘前凸蛤Pronoella pindiroensis Cox 1965;f.古栗蛤Palaeonucula sp.;g.花蛤未定种Astarte sp.;h, i.速水小林蛤Kobayashites hemicylindricus Hayami 1959;图中比例尺为1 cm

      Fig.  7.  Bivalve fossils from the Yeba Formation

      图  8  叶巴组中酸性火山岩部分熔融图解

      Schiano et al.(2010);a. Th/Sm-Th图解;b. Th/Hf-Th图解

      Fig.  8.  Partial melting diagram for intermediate acid volcanic rocks from the Yeba Formation

      图  9  叶巴组火山岩FeOT-MgO图解(a)和Yb/Ta-Y/Nb图解(b)

      图a底图据Zorpi et al.(1991);图b数据来源:BBC.平均大陆地壳,据Rudnick and Gao(2003);LCC.大陆下地壳,据Rudnick and Gao(2003);DMM.亏损地幔,据Salters and Stracke(2004)

      Fig.  9.  Diagrams of FeOT-MgO(a) and Yb/Ta-Y/Nb(b) for volcanic rocks from the Yeba Formation

      图  10  叶巴组火山岩构造判别图解

      a. Zr×3-Nb×50-Ce/P2O5图解,据Müller et al.(1992);b. Th/Ta-Yb图解,据Gorton and Schandl(2000);c. La/Yb-Sc/Ni图解,据Pearce(1982);d. Th/Yb-Nb/Yb图解,据Condie et al.(1986)

      Fig.  10.  Structure discriminant diagrams of the Yeba Formation

      表  1  叶巴组凝灰岩LA-ICP-MS锆石U-Pb定年结果

      Table  1.   LA-ICP-MS zircon U-Pb dating results of the Yeba Formation tuffs

      样品号 含量(10-6) Th/U 同位素比值 年龄值(Ma)
      Th U 207Pb/235U 206Pb/238U 207Pb/235U 206Pb/238U
      ST32
      2 177 266 0.66 0.206 27 0.006 40 0.029 66 0.000 42 190 5 188 3
      3 214 321 0.67 0.228 28 0.007 25 0.032 89 0.000 48 209 6 209 3
      4 224 340 0.66 0.228 51 0.006 83 0.032 68 0.000 46 209 6 207 3
      5 148 258 0.57 0.233 56 0.015 58 0.032 47 0.000 53 213 13 206 3
      6 288 330 0.87 0.230 00 0.007 43 0.032 88 0.000 47 210 6 209 3
      7 189 303 0.62 0.228 31 0.006 83 0.032 51 0.000 46 209 6 206 3
      8 138 232 0.59 0.226 99 0.006 41 0.032 71 0.000 46 208 5 207 3
      12 158 221 0.71 0.230 11 0.011 67 0.033 05 0.000 56 210 10 210 3
      13 414 427 0.97 0.229 41 0.007 38 0.032 92 0.000 47 210 6 209 3
      14 166 241 0.69 0.228 23 0.006 74 0.032 84 0.000 46 209 6 208 3
      17 285 274 1.04 0.228 68 0.011 90 0.032 63 0.000 58 209 10 207 4
      19 339 418 0.81 0.230 01 0.007 26 0.032 88 0.000 46 210 6 209 3
      20 108 164 0.66 0.225 35 0.007 17 0.032 48 0.000 46 206 6 206 3
      ST33
      1 218 338 0.65 0.234 57 0.011 97 0.032 04 0.000 46 214 10 203 3
      2 317 370 0.86 0.226 55 0.007 40 0.032 38 0.000 45 207 6 205 3
      4 176 269 0.65 0.223 43 0.006 97 0.032 17 0.000 44 205 6 204 3
      5 285 357 0.80 0.225 26 0.006 77 0.032 21 0.000 43 206 6 204 3
      6 217 155 1.40 0.223 91 0.008 41 0.032 17 0.000 46 205 7 204 3
      7 376 431 0.87 0.230 13 0.006 44 0.030 52 0.000 41 210 5 194 3
      8 281 329 0.86 0.215 42 0.007 04 0.030 83 0.000 43 198 6 196 3
      9 133 226 0.59 0.224 41 0.008 64 0.032 18 0.000 46 206 7 204 3
      10 242 295 0.82 0.224 01 0.011 19 0.032 12 0.000 54 205 9 204 3
      14 182 266 0.69 0.226 72 0.007 87 0.032 63 0.000 46 207 7 207 3
      15 178 292 0.61 0.225 23 0.015 14 0.032 45 0.000 66 206 13 206 4
      17 167 220 0.76 0.227 96 0.008 88 0.032 71 0.000 49 209 7 207 3
      18 187 284 0.66 0.221 58 0.012 93 0.032 41 0.000 46 203 11 206 3
      ST34
      7 195 299 0.65 0.239 25 0.007 50 0.032 76 0.000 45 218 6 208 3
      10 515 478 1.08 0.232 89 0.007 22 0.033 27 0.000 45 213 6 211 3
      16 153 204 0.75 0.229 18 0.009 22 0.032 98 0.000 48 210 8 209 3
      下载: 导出CSV

      表  2  叶巴组凝灰岩锆石稀土元素(10-6)分析结果

      Table  2.   Analytical results of the zircon REE elements(10-6)of the tuffs from the Yeba Formation

      样品号 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
      ST32
      2 0.2 9.1 0.1 1.1 1.9 0.4 10.3 4.1 53.6 22.6 112.0 29.6 334.6 87.7
      3 0.3 10.9 0.1 1.1 2.0 0.5 11.9 4.3 58.2 23.9 117.0 29.8 334.1 86.4
      4 0.4 11.0 0.1 1.4 2.5 0.6 11.7 4.8 69.5 29.2 147.2 37.5 412.9 118.5
      5 0.1 8.3 0.1 1.3 2.9 0.5 15.6 6.0 78.8 32.2 152.0 37.3 399.3 94.5
      6 2.2 16.3 0.5 2.5 1.9 0.5 9.0 3.7 49.6 21.0 103.8 27.8 309.9 80.2
      7 1.7 11.2 0.4 2.7 2.7 0.5 14.6 6.1 81.7 33.6 160.5 40.9 446.5 107.8
      8 3.4 15.9 0.8 4.1 2.4 0.5 10.2 3.9 50.6 21.3 103.9 27.1 313.9 78.5
      12 0.0 11.5 0.1 0.9 2.6 0.6 13.9 5.6 71.0 29.1 145.3 37.8 429.1 106.0
      13 2.2 16.0 0.4 2.7 2.0 0.7 10.1 4.1 55.9 23.6 117.7 31.5 370.8 97.6
      14 0.6 10.2 0.2 1.2 2.0 0.4 10.1 4.0 55.1 23.2 116.3 28.8 309.3 82.0
      17 0.0 14.4 0.1 1.9 4.9 1.3 30.0 11.2 143.0 56.3 245.2 56.3 555.6 126.1
      19 2.7 19.4 0.9 7.0 10.3 1.8 50.2 18.1 220.0 80.0 347.2 76.3 734.6 168.9
      20 0.0 7.0 0.1 0.7 2.0 0.5 10.5 3.8 48.9 19.7 92.4 23.1 262.4 65.9
      ST33
      1 0.4 11.8 0.2 1.4 2.3 0.5 12.9 5.2 70.4 29.3 144.3 36.5 411.1 101.6
      2 18.5 47.0 4.7 19.6 4.6 0.5 11.5 3.9 49.9 20.6 97.8 23.9 249.8 60.0
      4 1.0 12.3 0.3 2.4 3.3 0.7 16.3 6.2 78.1 31.2 144.4 35.8 382.9 89.7
      5 0.0 14.9 0.0 0.8 1.8 0.6 11.9 4.6 64.5 27.7 143.6 38.9 452.2 115.3
      6 0.0 22.9 0.3 5.6 10.2 3.3 44.7 15.7 181.1 67.0 286.1 64.9 659.3 145.3
      7 0.1 11.0 0.1 1.0 1.6 0.5 10.8 4.5 59.7 24.7 118.0 30.9 339.1 82.3
      8 0.1 13.9 0.1 2.6 5.3 1.1 29.9 11.0 134.9 52.9 234.6 54.6 548.9 127.7
      9 0.0 8.7 0.0 0.8 2.1 0.4 11.2 4.5 57.9 24.4 117.5 29.3 323.7 79.4
      10 0.1 15.3 0.1 1.4 3.3 1.0 15.7 6.4 84.1 34.8 172.7 45.3 516.2 131.6
      14 1.1 12.2 0.4 3.9 5.9 1.5 28.0 10.2 125.2 47.2 211.8 51.6 552.0 118.3
      15 0.6 3.4 0.3 1.6 1.5 0.4 9.6 4.7 60.5 26.3 134.8 34.4 376.8 93.4
      17 0.1 10.0 0.1 1.3 2.5 0.5 12.8 4.9 65.7 27.0 127.7 33.0 371.4 94.6
      18 0.0 9.6 0.1 2.0 4.2 0.9 26.0 9.4 120.3 47.6 209.8 48.5 499.6 117.4
      ST34
      7 0.1 14.7 0.0 0.4 0.9 0.4 6.9 3.0 43.0 19.2 102.4 28.1 346.1 87.8
      10 3.2 40.9 0.7 4.1 3.8 0.9 18.8 7.4 96.9 39.4 192.1 49.7 562.0 138.2
      16 0.0 10.7 0.1 0.9 2.7 0.6 18.1 7.7 105.0 45.3 221.6 58.9 661.2 170.6
      下载: 导出CSV

      表  3  叶巴组凝灰岩主量元素(%)及微量元素(10-6)分析结果

      Table  3.   Analytical results of major (%) and trace elements (10-6) of the tuffs from the Yeba Formation

      样品号 ST32H2 ST32H4 ST33H3 ST33H4 ST35H2 ST35H3
      SiO2 61.13 62.97 67.19 68.87 76.61 77.19
      Al2O3 21.96 21.08 18.49 17.42 13.08 12.45
      Fe2O3T 2.44 2.16 2.58 2.85 0.76 0.79
      FeOT 2.2 1.95 2.32 2.57 0.68 0.71
      FeO 1.87 1.66 1.97 2.18 0.58 0.61
      MgO 0.8 0.79 0.79 0.91 0.11 0.51
      CaO 2.43 3.22 1.32 0.56 0.23 0.81
      Na2O 1.25 1.64 0.88 0.54 4.97 3.8
      K2O 7.15 5.31 5.68 5.43 2.57 2.19
      P2O5 0..02 0.01 0.02 0.02 0.03 0.04
      MnO 0.07 0.06 0.05 0.05 0.02 0.02
      TiO2 0.56 0.53 0.37 0.33 0.12 0.15
      LOI 1.76 1.83 2.1 2.46 0.79 1.32
      Total 99.57 99.59 99.47 99.44 99.3 99.27
      Li 11.51 10.95 14.98 15.2 5.66 3.95
      P 89.32 95.62 121.4 56.9 107.72 133.6
      K 44 620 36 440 42 720 37 800 17 340 14 520
      Sc 9.12 9.3 8.84 7.68 1.87 1.96
      Ti 2756 2864 2208 1958.6 631.4 802
      Cr 7.86 7.71 7.63 6.43 1.97 2.82
      Co 5.78 4.14 3.78 6.97 1.02 0.86
      Ni 2.2 1.73 2.89 2.96 0.67 0.94
      Rb 199.9 163.98 208 220.4 66.92 76.32
      Sr 180.05 266.7 130.12 61.76 94.42 204.5
      Y 28.84 31.62 31.04 33.34 11.27 15.32
      Zr 217.8 222.2 159.26 145.28 50.58 70.79
      Nb 18.84 20.1 16.65 15.76 8.03 10.48
      Ba 1 045.44 997.04 933.24 827.2 296.78 581.46
      La 36.96 41.52 40.74 40.82 9.72 16.8
      Ce 69.2 78.44 77.38 79.2 18.93 31.2
      Pr 7.89 8.58 8.63 9.01 2.01 3.24
      Nd 28.56 30.36 30.22 32.64 6.58 10.85
      Sm 5.69 5.88 5.84 6.65 1.38 2.23
      Eu 1.33 1.28 1.26 1.26 0.2 0.38
      Gd 5.5 5.7 5.65 6.61 1.4 2.29
      Tb 0.82 0.86 0.83 0.98 0.24 0.38
      Dy 5.29 5.73 5.35 6.33 1.72 2.63
      Ho 1.1 1.21 1.11 1.32 0.38 0.58
      Er 3.12 3.49 3.12 3.75 1.17 1.74
      Tm 0.49 0.54 0.48 0.58 0.2 0.29
      Yb 3.29 3.65 3.17 3.9 1.43 2.02
      Lu 0.52 0.57 0.5 0.63 0.23 0.33
      Hf 5.26 5.58 3.99 3.72 1.3 1.88
      Ta 1.07 1.17 1.04 0.98 0.58 0.67
      Th 19.93 21.06 19.38 20.83 9.15 16
      U 5.68 5.82 4.57 5.06 3.24 5.26
      Pb 38.76 45.1 22.47 13.39 4.79 13.63
      Eu* 0.73 0.68 0.67 0.58 0.44 0.52
      Mg# 43.2 45.9 41.7 42.6 25.9 59.9
      A/CNK 1.54 1.48 1.85 2.24 1.15 1.23
      A/NK 2.24 2.5 2.43 2.57 1.19 1.44
      (La/Yb)N 8.06 8.16 9.23 7.51 4.89 5.98
      (Yb)N 19.4 21.5 18.62 22.93 8.38 11.86
      注:FeOT=Fe2O3T×0.89;A/CNK=(Al2O3/102)/((CaO/56.1)+(Na2O/62.0)+(K2O/94.2));A/NK=(Al2O3/102)/((Na2O/62.0)+(K2O/94.2));Mg#=(MgO/40.3)/(MgO/40.3+Fe2O3T×0.89/71.9×0.85)×100;Eu*=Eu/SQRT(Sm×Gd).
      下载: 导出CSV

      表  4  叶巴组化石统计表

      Table  4.   Statistical table of the Yeba Formation fossils

      地区 层位 主要化石种类 代表时代 资料来源
      叶巴沟 / 珊瑚化石Theosmilia sp. 晚三叠世 西藏地质局, 1974, 内部资料
      却桑温泉 / 菊石化石 早-中三叠世 西藏综合队, 1976, 内部资料
      甲马沟 / 水螅化石 晚三叠世-早侏罗世 成都地震大队, 1976, 内部资料
      白堆乡 杂砂岩夹千枚岩 双壳类化石Pronoella (Gythemon) sp等 中侏罗世巴柔期 苟金,1994
      白堆乡 板岩 双壳类化石Protocardia stricldandi 中侏罗世巴柔-巴通期 苟金,1994
      白堆乡 千枚岩夹凝灰岩 虫迹化石Pelecypodichnus sp. 侏罗世 苟金,1994
      得中剖面 浅变质泥岩 双壳类化石Palaeonucula sp., Grammatodon sp. Propeamussium (P.) laeviradiatum (Waagen)等 早-中侏罗世托尔-巴柔期 裴树文,1999
      加兴乡 灰白色细砂岩 双壳类化石Trigonodus xiabolangensis sp., Isocyprina lhasaensis sp., 等 中-晚三叠世 Yin and Grant-Mackie, 2005
      得中地区 泥岩 双壳类化石Grammatodon sp., Kobayashites hayamii Yin, Limatula sp., Aguilerella sp., 早侏罗世 Yin and Grant-Mackie, 2005
      甲鲁朗 凝灰岩 双壳类化石Pronoella pindiroensis Cox 1965,Palaeonucula sp., Kobayashites hemicylindricus 晚三叠世-早侏罗世 本文
      下载: 导出CSV

      表  5  叶巴组火山岩及冈底斯岩浆弧岩浆岩形成时代

      Table  5.   Ages of Miocene magmatic rocks of Gangdese metallogenic belt

      地区 岩性 测试方法 测试对象 年龄(Ma) 资料来源
      达孜 英安岩 SHRIMP U-Pb 锆石 181.7±5.2 耿全如等,2006
      甲马沟 流纹岩 LA-ICP-MS U-Pb 锆石 174.4±1.7 董彦辉等,2006
      达孜 英安岩 SHRIMP U-Pb 锆石 174.2±3.6 Zhu et al, ,2008
      得明顶 英安岩 SHRIMP U-Pb 锆石 192.7±1.3 陈炜等,2009
      驱龙 玄武岩 LA-ICP-MS U-Pb 锆石 188±2 黄丰等,2015
      甲马 安山岩 LA-ICP-MS U-Pb 锆石 175±2 黄丰等,2015
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    • 收稿日期:  2019-04-13
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