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    四川石棉县大水沟岩片绿片岩锆石SHRIMP U-Pb年代学及其地质意义

    阮林森 赵鹏大 胡光道 杨晓勇 侯立玮 陈陵康 赵陕兰

    阮林森, 赵鹏大, 胡光道, 杨晓勇, 侯立玮, 陈陵康, 赵陕兰, 2013. 四川石棉县大水沟岩片绿片岩锆石SHRIMP U-Pb年代学及其地质意义. 地球科学, 38(4): 663-676. doi: 10.3799/dqkx.2013.067
    引用本文: 阮林森, 赵鹏大, 胡光道, 杨晓勇, 侯立玮, 陈陵康, 赵陕兰, 2013. 四川石棉县大水沟岩片绿片岩锆石SHRIMP U-Pb年代学及其地质意义. 地球科学, 38(4): 663-676. doi: 10.3799/dqkx.2013.067
    RUAN Lin-sen, ZHAO Peng-da, HU Guang-dao, YANG Xiao-yong, HOU Li-wei, CHEN Ling-kang, ZHAO Shan-lan, 2013. SHRIMP U-Pb Dating of Greenschist from Dashuigou Schiefer, Shimian County, Shichuan Province and Its Geological Significance. Earth Science, 38(4): 663-676. doi: 10.3799/dqkx.2013.067
    Citation: RUAN Lin-sen, ZHAO Peng-da, HU Guang-dao, YANG Xiao-yong, HOU Li-wei, CHEN Ling-kang, ZHAO Shan-lan, 2013. SHRIMP U-Pb Dating of Greenschist from Dashuigou Schiefer, Shimian County, Shichuan Province and Its Geological Significance. Earth Science, 38(4): 663-676. doi: 10.3799/dqkx.2013.067

    四川石棉县大水沟岩片绿片岩锆石SHRIMP U-Pb年代学及其地质意义

    doi: 10.3799/dqkx.2013.067
    基金项目: 

    中国地质调查局"我国三稀金属资源战略调查四川三稀资源综合研究与重点评价" 1212011220814

    详细信息
      作者简介:

      阮林森(1969-), 男, 工程师, 博士研究生, 研究方向矿产普查与勘探.E-mail: linsenruan@163.com

    • 中图分类号: P539.2

    SHRIMP U-Pb Dating of Greenschist from Dashuigou Schiefer, Shimian County, Shichuan Province and Its Geological Significance

    • 摘要: 大水沟岩片位于安宁河深大断裂带中段, 川西松潘甘孜造山带与扬子地台结合部位, 因其特殊的构造位置和赋存碲矿床而备受重视.运用SRHIMP U-Pb定年技术对大水沟绿片岩进行年龄测试, 来确定大水沟岩片的形成时代, 为大水沟周缘石棉-冕宁一带乃至川西扬子地台西缘的构造岩浆演化提供有益信息, 同时为大水沟碲铋矿床的形成时代提供线索.大水沟原岩恢复表明其应当有相当部分为沉积岩, 运用SHRIMP U-Pb定年从中获得的5种不同年龄段具有内部结构、外观特征的锆石差异.2467~2358Ma年龄的残留碎屑岩浆锆石说明扬子地台西缘存在太古代-古元古代的物源搬运; 790.5~762.5Ma的岩浆锆石与新元古代早期Rodinia超大陆裂解、地幔柱上涌时的岩浆事件有关; 696.8~642.9Ma锆石年龄反映了大水沟周缘碰撞造山和后造山期岩浆活动和变质作用; 伴随峨眉地裂大规模基性岩浆活动, 在大水沟近源很可能有262.0~220.0Ma碱性杂岩的侵入; 典型热液增生锆石216.5~167.1Ma年龄揭示了该区中侏罗世大规模的岩浆期后热液活动.大水沟岩片可能为异地推覆系统, 岩浆锆石年龄和热液增生锆石年龄限制了大水沟岩片总体定位于220.0~167.1Ma之间.

       

    • 图  1  大水沟区域构造略图(据喻安光等改编,1998)

      1.T-P1.三叠系-二叠系下统;2.S1-S2-3.志留系通化群;3.γ52侏罗纪二长花岗岩;4.γ22早震旦世中粒二长花岗岩;5.Ar-Pt康定杂岩;F1.滨东滑脱韧性剪切带;F2.西油坊逆冲推覆韧性剪切带;F3.拉谷盆子滑脱韧性剪切带;F4.野鸡洞逆冲推覆韧性剪切带;Ⅰ.洪坝构造岩片;Ⅱ.大水沟构造岩片;Ⅲ.蟹螺构造岩片;Ⅳ.岩勒构造岩片;Ⅴ.挖角坝构造岩片

      Fig.  1.  Tectonic and geologic map of the Dashuigou region

      图  2  区分正副变质岩的A-C-FM图(据王仁民等,1987)

      A.铝质系数;C.钙质系数;FM.镁系数

      Fig.  2.  A-C-FM Diagram for differing orthorock

      图  3  岩石类型La/Tb-∑REE判别图解(据Allegre, 1978)

      Fig.  3.  La/Yb-∑REE discriminant diagram of rock types

      图  4  区分正副变质岩的Zr/TiO2-Ni和Rfm-Rfl-Rv图解(a.据Wenchester et al., 1980; b.据王仁民等,1987)

      Fig.  4.  Zr/TiO2-Ni diagram and Rfm-Rfl-Rv diagram for differing orthorock from pararock

      图  5  大水沟绿片岩锆石阴极发光图(图下方为细粒斜长角闪片岩中8颗锆石的反射光照片)

      Fig.  5.  Zircon CL images for greenshcist in Dashuigou

      图  6  锆石年龄谐和图

      a.N1锆石4点;b.N2热液锆石

      Fig.  6.  Zircon U-Pb concordia diagram

      图  7  12颗高Th、U锆石加权平均年龄

      Fig.  7.  Weighted age of 12 zircons with abnormally high Th and U

      图  8  N2锆石39个测点的协和年龄

      Fig.  8.  Zircon U-Pb Concordia diagram of 39 spots from sample N2

      表  1  大水沟绿片岩主量(%)和微量元素(μg/g)分析结果

      Table  1.   Major (%) and trace elements (μg/g) analyses of green schist, Dashuigou

      样号名称 H1片岩 H2片岩 H3片岩 H4片岩 H5片岩
      SiO2 45.45 44.02 39.20 39.64 37.89
      TiO2 1.70 1.70 1.35 1.48 1.85
      Al2O3 14.46 17.49 16.88 16.16 18.06
      Fe2O3 3.80 4.67 3.16 3.26 2.86
      FeO 10.84 8.17 9.75 9.01 11.98
      MnO 0.26 0.22 0.20 0.20 0.21
      MgO 7.26 7.97 8.14 7.73 9.37
      CaO 7.57 10.15 9.64 10.69 7.49
      Na2O 1.77 2.47 1.67 1.66 1.68
      K2O 0.80 0.31 2.38 2.39 2.35
      P2O5 0.30 0.37 0.16 0.32 0.26
      H2O+ 1.91 1.91 1.85 1.58 2.67
      H2O- 0.06 0.06 0.13 0.11 0.19
      S 0.15 0.15 0.18 0.20 0.10
      CO2 3.14 0.65 4.04 4.87 1.57
      Total 99.47 100.31 98.74 99.30 98.53
      Cs 4.37 4.01 4.07 4.34 4.00
      Rb 41.90 14.34 29.30 252.09 118.43
      Sr 215.00 201.05 128.00 199.00 219.60
      Ba 269.00 250.44 289.00 315.39 348.92
      Ga 28.34 19.45 21.97 20.88 25.56
      Nb 18.30 16.20 6.21 17.14 17.92
      Ta 1.66 1.20 1.22 1.36 1.36
      Zr 134.00 94.00 78.90 113.00 101.00
      Hf 3.36 13.00 3.45 2.70 4.40
      Th 6.05 1.85 4.41 1.48 1.69
      V 325.50 285.10 306.27 254.90 378.80
      Cr 175.80 162.80 188.50 229.00 173.70
      Co 58.90 54.94 47.70 26.26 61.89
      Ni 90.30 89.17 103.73 123.20 98.82
      B 4.10 3.50 3.67 4.20 3.30
      Li 24.40 22.86 22.20 41.56 41.36
      Sc 41.57 37.45 39.65 38.19 43.31
      U 1.55 1.45 0.69 0.52 0.58
      Cu 21.45 19.46 44.02 61.42 51.18
      Zn 272.44 177.15 156.27 145.55 146.10
      Pb 28.90 36.18 27.03 24.81 20.08
      La 15.50 19.46 11.20 18.47 21.18
      Ce 36.30 34.78 26.60 30.59 36.90
      Pr 4.79 4.76 3.28 4.28 4.96
      Nd 20.20 20.71 12.90 17.91 21.21
      Sm 4.51 5.51 3.23 4.68 5.29
      Eu 1.51 1.55 1.40 1.90 1.95
      Gd 3.70 4.55 2.58 3.96 4.27
      Tb 0.77 1.10 0.50 0.99 0.96
      Dy 4.95 6.68 2.93 6.32 5.68
      Ho 0.90 1.42 0.55 1.31 1.17
      Er 2.58 3.71 1.60 3.38 3.12
      Tm 0.40 0.58 0.25 0.54 0.48
      Yb 2.35 3.17 1.43 2.91 2.52
      Lu 0.35 0.41 0.24 0.40 0.34
      Y 23.50 39.78 14.30 38.63 33.86
      REE 122.31 148.14 82.99 136.27 143.89
      LREE 82.81 86.76 58.61 77.84 91.48
      HREE 16.00 21.60 10.08 19.81 18.54
      LR/HR 5.18 4.02 5.81 3.93 4.93
      下载: 导出CSV

      表  2  大水沟岩片绿片岩锆石SHRIMP U-Pb年龄分析结果

      Table  2.   Analytical data of SHRIMP U-Pb isotope of zircon grains from greenshcist, in Dashuigou schiefer

      样点编号 U(10-6) Th(10-6) 232Th/238U 206Pbc(%) 206Pb*(10-6) 206Pb/238U(Ma) 1δerr 208Pb/232Th(Ma) 1δerr 207Pb/206Pb(Ma) 1δ err 207Pb*/206Pb* err (%) 207Pb*/235U err (%) 206Pb*/238U err (%) err corr
      G3784-2#-27.1 56 53 0.97 3.23 6.5 790.5 13.0 599 43 34 261 0.0467 10.9 0.84 11.0 0.1305 1.7 0.158
      G3784-2#-12 56 78 1.43 2.10 6.3 780.0 8.2 694 26 309 173 0.0525 7.6 0.93 7.7 0.1286 1.1 0.146
      G3784-2#-1-2.1 82 148 1.87 1.45 8.9 762.5 6.6 677 23 548 105 0.0585 4.8 1.01 4.9 0.1256 0.9 0.187
      G3784-2#-18.1 44 61 1.43 2.54 4.4 696.4 9.2 569 27 299 227 0.0523 10.0 0.82 10.1 0.1141 1.4 0.138
      G3784-2#-1-1.1 106 118 1.15 1.08 10.4 689.4 6.0 607 14 444 86 0.0558 3.9 0.87 4.0 0.1129 0.9 0.229
      G3784-2#-6.1 136 96 0.73 1.10 13.4 688.7 4.9 567 28 504 77 0.0573 3.5 0.89 3.6 0.1127 0.8 0.210
      G3784-2#-10 301 160 0.55 0.46 29.0 682.4 3.8 608 12 603 37 0.0600 1.7 0.92 1.8 0.1117 0.6 0.330
      G3784-2#-9 266 149 0.58 0.41 25.1 669.0 4.3 619 16 538 51 0.0582 2.3 0.88 2.4 0.1094 0.7 0.281
      G3784-2#-31.2 304 191 0.65 0.14 27.9 653.3 3.7 617 9 649 30 0.0613 1.4 0.90 1.5 0.1066 0.6 0.391
      G3784-2#-32.2 248 130 0.54 0.32 22.8 651.8 4.1 598 12 604 38 0.0600 1.7 0.88 1.9 0.1064 0.7 0.356
      G3784-2#-14.1 435 201 0.48 0.30 39.6 647.1 3.3 595 14 581 26 0.0594 1.2 0.86 1.3 0.1056 0.5 0.414
      G3784-2#-8.1 199 247 1.28 0.72 18.1 642.9 4.0 600 10 646 47 0.0612 2.2 0.88 2.3 0.1049 0.7 0.287
      G3784-2#-33.2 176 84 0.49 0.74 9.6 392.4 6.7 574 21 586 99 0.0595 4.6 0.51 4.9 0.0628 1.8 0.360
      G3784-2#-23.1 285 84 0.31 0.87 13.9 353.1 14.2 346 22 336 70 0.0532 3.1 0.41 5.2 0.0563 4.1 0.800
      G3784-2#-5.1 148 205 1.42 3.30 5.5 262.0 2.7 223 10 -841 510 0.0334 17.8 0.19 17.8 0.0415 1.1 0.059
      G3784-2#-7.1 72 116 1.66 3.89 2.6 260.9 4.5 222 13 64 157 0.0313 25.3 0.18 25.4 0.0413 1.8 0.070
      G3784-2#-22.1 176 291 1.71 1.26 6.3 260.9 2.1 240 6 -1036 757 0.0473 6.6 0.27 6.7 0.0413 0.8 0.125
      G3784-2#-11 100 191 1.96 3.50 3.6 256.5 3.5 195 22 -522 603 0.0375 22.5 0.21 22.6 0.0406 1.4 0.061
      G3784-2#-25.1 227 441 2.00 1.77 8.0 255.3 2.0 234 5 -231 192 0.0419 7.6 0.23 7.7 0.0404 0.8 0.104
      G3784-2#-20.1 104 199 1.98 3.68 3.7 255.2 4.0 222 14 -1048 683 0.0311 22.8 0.17 22.8 0.0404 1.6 0.070
      G3784-2#-21.1 166 529 3.30 1.92 5.8 252.6 2.4 228 6 -128 217 0.0437 8.8 0.24 8.9 0.0400 1.0 0.110
      G3784-2#-16.1 46 74 1.67 2.30 1.6 249.6 7.1 222 13 -301 551 0.0408 21.6 0.22 21.8 0.0395 2.9 0.134
      G3784-2#-17.1 210 428 2.11 1.00 7.1 247.9 1.8 226 4 152 103 0.0491 4.4 0.27 4.5 0.0392 0.8 0.169
      G3784-2#-13.1 228 664 3.01 1.67 7.8 247.8 2.1 221 3 -116 170 0.0439 6.9 0.24 6.9 0.0392 0.9 0.125
      G3784-2#-3.1 204 598 3.03 1.71 6.9 245.0 2.0 210 3 -204 207 0.0424 8.2 0.23 8.3 0.0387 0.8 0.099
      G3784-2#-15.1 954 1691 1.83 0.34 31.2 240.2 1.2 211 5 114 57 0.0483 2.4 0.25 2.5 0.0380 0.5 0.203
      G3784-2#-24.1 533 1471 2.85 0.91 16.9 232.3 1.3 228 4 -87 94 0.0444 3.8 0.22 3.9 0.0367 0.6 0.150
      G3784-2#-26.1 1556 3617 2.40 0.25 48.6 229.6 1.0 203 2 193 25 0.0500 1.1 0.25 1.2 0.0363 0.5 0.389
      G3784-2#-28.1 1822 4576 2.60 0.17 56.6 228.4 1.0 202 2 238 21 0.0509 0.9 0.25 1.0 0.0361 0.4 0.449
      G3784-2#-19.1 909 2596 2.95 0.58 28.2 227.1 1.1 196 3 89 49 0.0478 2.1 0.24 2.1 0.0359 0.5 0.238
      G3784-2#-37.1 799 1423 1.84 0.32 23.9 220.0 1.7 198 2 174 42 0.0496 1.8 0.24 1.9 0.0347 0.8 0.403
      G3784-2#-35.1 3411 1022 0.31 0.45 100.5 216.5 0.9 216 4 273 22 0.0517 1.0 0.24 1.1 0.0342 0.4 0.409
      G3784-2#-30.1 5209 293 0.06 0.54 130.9 184.9 1.2 230 20 215 25 0.0504 1.1 0.20 1.3 0.0291 0.7 0.518
      G3784-2#-31.1 4596 241 0.05 0.22 112.4 180.5 1.6 221 9 164 18 0.0493 0.8 0.19 1.2 0.0284 0.9 0.762
      G3784-2#-29.1 4479 52 0.01 0.14 105.5 174.1 1.8 115 30 133 17 0.0487 0.7 0.18 1.3 0.0274 1.0 0.825
      G3784-2#-32.1 3838 134 0.04 0.14 89.3 172.0 0.8 172 10 157 17 0.0492 0.7 0.18 0.9 0.0270 0.5 0.564
      G3784-2#-33.1 4455 182 0.04 0.16 103.6 172.0 1.1 172 11 173 18 0.0495 0.8 0.18 1.0 0.0270 0.7 0.651
      G3784-2#-34.1 4952 183 0.04 0.19 114.9 171.5 0.7 180 13 115 20 0.0483 0.8 0.18 0.9 0.0270 0.4 0.457
      G3784-2#-36.1 5356 211 0.04 0.17 121.1 167.1 1.8 150 10 150 17 0.0490 0.7 0.18 1.3 0.0263 1.1 0.832
      G3784-1#-1.1 145 317 2.26 1.15 10.9 533.0 4.0 477 10 259 111 0.0514 4.9 0.61 4.9 0.0862 0.8 0.158
      G3784-1#-2.1 37 40 1.11 9.08 0.7 127.0 5.2 88 24 0.0199 4.1
      G3784-1#-3.1 200 107 0.56 0.28 58.7 1892.7 9.9 1649 23 2430 9 0.1576 0.5 7.42 0.8 0.3412 0.6 0.761
      G3784-1#-4.1 193 103 0.55 1.44 7.5 282.6 2.4 233 16 -17 181 0.0457 7.5 0.28 7.5 0.0448 0.9 0.116
      G3784-1#-5.1 193 101 0.54 0.25 61.7 2030.7 11.0 2217 31 2400 9 0.1548 0.5 7.90 0.8 0.3703 0.6 0.765
      G3784-1#-6.1 522 456 0.90 3.61 19.1 259.5 1.7 169 10 -38 180 0.0453 7.4 0.26 7.5 0.0411 0.7 0.092
      G3784-1#-7.1 509 451 0.92 0.39 118.6 1542.5 6.8 1436 15 2358 9 0.1511 0.5 5.63 0.7 0.2703 0.5 0.695
      G3784-1#-8.1 141 73 0.53 0.63 45.6 2049.7 15.7 1790 57 2467 16 0.1611 0.9 8.32 1.3 0.3743 0.9 0.686
      注:(1)1#为上部细粒斜长角闪片岩中的N1锆石,2#为下部阳起石斜长角闪片岩中的N2锆石;(2)206Pbc表示普通206Pb占总206Pb的百分比,206Pb*表示放射性206Pb的含量.
      下载: 导出CSV
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