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    大别山早白垩世基性脉岩SHRIMP锆石U-Pb定年、地球化学特征及成因

    王世明 马昌前 王琳燕 张金阳 杨颖

    王世明, 马昌前, 王琳燕, 张金阳, 杨颖, 2010. 大别山早白垩世基性脉岩SHRIMP锆石U-Pb定年、地球化学特征及成因. 地球科学, 35(4): 572-584. doi: 10.3799/dqkx.2010.073
    引用本文: 王世明, 马昌前, 王琳燕, 张金阳, 杨颖, 2010. 大别山早白垩世基性脉岩SHRIMP锆石U-Pb定年、地球化学特征及成因. 地球科学, 35(4): 572-584. doi: 10.3799/dqkx.2010.073
    WANG Shi-ming, MA Chang-qian, WANG Lin-yan, ZHANG Jin-yang, YANG Ying, 2010. SHRIMP Zircon U-Pb Dating, Geochemistry and Genesis of Early Cretaceous Basic Dykes from the Dabie Orogen. Earth Science, 35(4): 572-584. doi: 10.3799/dqkx.2010.073
    Citation: WANG Shi-ming, MA Chang-qian, WANG Lin-yan, ZHANG Jin-yang, YANG Ying, 2010. SHRIMP Zircon U-Pb Dating, Geochemistry and Genesis of Early Cretaceous Basic Dykes from the Dabie Orogen. Earth Science, 35(4): 572-584. doi: 10.3799/dqkx.2010.073

    大别山早白垩世基性脉岩SHRIMP锆石U-Pb定年、地球化学特征及成因

    doi: 10.3799/dqkx.2010.073
    基金项目: 

    国家自然科学基金重点项目 40334037

    国家科学技术部国际科技合作项目 2007DFA21230

    详细信息
      作者简介:

      王世明(1981-), 男, 博士研究生, 矿物学岩石学专业.E-mail: aaawsm11@cug.edu.cn

      通讯作者:

      马昌前, E-mail: cqma@cug.edu.cn

    • 中图分类号: P597

    SHRIMP Zircon U-Pb Dating, Geochemistry and Genesis of Early Cretaceous Basic Dykes from the Dabie Orogen

    • 摘要: 研究大别山早白垩世大规模伸展开始时间及地幔属性.采用SHRIMP锆石U-Pb定年法, 测得北淮阳金寨银沙畈辉长脉岩年龄为125.8±2.7 Ma, 西大别大悟东新乡闪斜煌斑脉岩年龄为129.6±2.5 Ma; 大别山不同区块早白垩世基性脉岩的地球化学特征类似: SiO2介于46.13%~54.42%, Mg#在42~72之间, 大多属碱性系列; LREE富集, HREE亏损, 大离子亲石元素(LILE)富集, 高场强元素(HFSE)Nb、Zr、Ti亏损; ISr在0.705 5~0.709 4之间, 低εNd(t)(-12.04~-18.84)值, Nd模式年龄(TDM)为1.60~2.62 Ga.大别山早白垩世的地壳伸展、大规模岩浆活动开始于130 Ma, 属于整个中国东部晚中生代岩石圈伸展减薄事件的一部分.基性脉岩来源于富集岩石圈地幔, 主要为扬子俯冲陆壳同华北岩石圈地幔混合产物, 有部分软流圈地幔物质的加入.

       

    • 图  1  大别山早白垩世基性脉岩采样位置

      Fig.  1.  Location map showing Early Cretaceous basic dykes from the Dabie orogen

      图  2  金寨银沙畈辉长脉岩(04-158-1)(a)和大悟东新乡煌斑岩(04-163-2)(b)锆石SHRIMP U-Pb年龄谐和图

      Fig.  2.  Zircon SHRIMP U-Pb concordia diagrams for Yinshafan gabbro (04-158-1) (a) and Dongxinxiang lamprophyre (04-163-2) (b)

      图  3  大别山基性脉岩SiO2-Alk图解(Middlemost,1994)

      ■煌斑脉岩;▲辉长-辉绿脉岩

      Fig.  3.  SiO2-Alk diagram for basic dykes from the Dabie orogen

      图  4  大别山基性脉岩REE球粒陨石标准配分图(a)及原始地幔标准化蛛网图(b)

      球粒陨石标准和原始地幔标准据Sun and McDonough(1989);太行数据张勇等(2003),脉岩年龄(120 Ma);胶北数据刘燊等(2005),脉岩年龄(129.1 Ma,121 Ma);湖南数据引自Wang et al.(2003),基性岩年龄(124.5 Ma,127.6 Ma)

      Fig.  4.  Chondrite-normalized REE patterns (a) and primitive mantle normalized spidergrams (b) of the basic dykes from the Dabie orogen

      图  5  大别山基性脉岩SiO2-ISr(a)和SiO2-εNd(130 Ma)(b)图解

      ■煌斑脉岩;▲辉长-辉绿脉岩

      Fig.  5.  SiO2-ISr (a) and SiO2-εNd (130 Ma) (b) diagrams of basic dykes from the Dabie orogen

      图  6  大别基性脉岩的87Sr/86Sr(t)-εNd(t)(t=130 Ma)同位素图解

      华北下地壳和扬子中上地壳同位素变化范围引自Jahn et al.(1999);扬子下地壳(崆岭群TTG)同位素变化范围引自Gao et al.(1999);亏损地幔和年轻地壳引自Sun and McDonough(1989);太行-鲁北基性脉岩(岩)数据邵济安和张履桥(2002)Ying et al.(2006);华南基性脉岩数据谢桂青等(2001)王岳军等(2007)Zhao et al.(2007a);鲁中基性岩引自Ying et al.(2006);苏鲁-胶北基性脉岩数据刘燊等(2005);北淮阳南大别基性脉岩数据引自Wang et al.(2005)

      Fig.  6.  Initial 87Sr/86Sr (t) versus εNd (t) (t=130 Ma) diagram for basic dykes from the Dabie orogen

      图  7  大别山基性脉岩La/Nb-Ba/Nb(a)和Ti/Yb-Nb/Th(b)相关(李献华等,2002)

      ■煌斑脉岩;▲辉长-辉绿脉岩;a图中:原始地幔据Sun and McDonough(1989);大陆地壳据Taylor and McLennan(1985)Condie(1993);碎屑沉积物据Condie(1993);MORB、OIB和Dupal OIB据Le Roux(1986);岛弧火山岩据Jahn and Zhang(1984);崆岭杂岩、扬子中地壳和扬子下地壳据Gao et al.(1998, 1999);b图中:夏威夷OIB数据引自Feigenson et al.(1996)Hofmann and Jochum(1996);中、下地壳数据引自Rudnick and Fountain(1995);大陆岩石圈地幔引自McDonough(1990);上地壳据Taylor and McLennan(1985);大别山基性脉岩引自Wang et al.(2005)

      Fig.  7.  Relations of Ba-Nb vs. La-Nb (a) and Ti-Yb vs. Nb-Th (b) for basic dykes from the Dabie orogen

      图  8  大别早白垩世基性脉岩大地构造环境判别图

      ■煌斑脉岩;▲辉长-辉绿脉岩;a图据Pearce(1982);b图据Meschede(1986);WPA.板内碱性玄武岩;WPT.板内拉斑玄武岩;VAB.火山弧玄武岩;P-MORB(P型富集MORB)和N-MORB(N型亏损MORB)

      Fig.  8.  Tectonic discriminates diagrams for basic dykes from the Dabie orogen

      表  1  大别山基性脉岩锆石SHRIMP U-Pb定年结果

      Table  1.   Zircon SHRIMP U-Pb data of basic dykes from the Dabie orogen

      点号 206Pbc(%) U(μg·g-1) Th(μg·g-1) 232Th/238U 206Pb*(μg·g-1) 207Pb*/206Pb* ±% 207Pb*/235U ±% 206Pb*/238U ±% 206Pb/238U(Ma) ±1σ γ
      金寨银沙畈辉长脉岩04-158-1
      1.1 0.29 284 806 2.93 4.91 0.044 5 7.0 0.122 0 7.8 0.019 91 3.3 127.1 4.1 0.424
      2.1 0.49 177 371 2.17 2.98 0.045 2 8.8 0.121 0 10.0 0.019 40 4.8 123.9 5.9 0.478
      3.1 0.27 384 1 293 3.48 6.47 0.050 7 3.1 0.137 1 4.5 0.019 60 3.2 125.2 4.0 0.715
      4.1 0.76 186 330 1.83 3.18 0.054 6 4.5 0.150 1 5.7 0.019 94 3.5 127.3 4.4 0.609
      5.1 1.13 246 499 2.10 4.24 0.024 3 38.0 0.064 0 38.0 0.019 24 3.4 122.9 4.1 0.089
      6.1 0.22 803 3 322 4.28 13.80 0.045 3 4.9 0.123 6 5.8 0.019 82 3.1 126.5 3.9 0.541
      7.1 0.19 338 1 045 3.20 5.80 0.044 7 8.8 0.122 0 9.3 0.019 85 3.2 126.7 4.0 0.345
      8.1 373 1 295 3.58 6.32 0.043 3 11.0 0.117 0 11.0 0.019 65 3.2 125.5 4.0 0.283
      9.1 833 2 418 3.00 14.20 0.042 8 4.7 0.116 5 5.7 0.019 74 3.1 126.0 3.9 0.551
      湖北大悟东新乡闪斜煌斑脉岩04-163-2
      1.1 1.44 109 155 1.46 1.94 0.057 6 14.0 0.161 0 15.0 0.020 31 4.8 129.6 6.2 0.326
      2.1 4.81 140 147 1.09 2.22 0.038 0 33.0 0.093 0 33.0 0.017 62 3.5 112.6 4.0 0.108
      3.1 0.84 322 538 1.73 5.69 0.050 7 12.0 0.143 0 13.0 0.020 39 2.8 130.1 3.6 0.221
      4.1 2.29 117 174 1.54 2.07 0.043 0 25.0 0.119 0 25.0 0.020 08 3.2 128.2 4.1 0.129
      5.1 0.65 212 309 1.50 3.64 0.050 9 11.0 0.139 0 11.0 0.019 81 2.8 126.4 3.5 0.253
      6.1 1.52 241 495 2.12 4.14 0.040 3 13.0 0.109 0 14.0 0.019 69 2.7 125.7 3.4 0.200
      7.1 2.28 272 223 0.85 4.79 0.051 1 18.0 0.141 0 18.0 0.020 03 3.0 127.8 3.8 0.164
      8.1 0.00 120 192 1.65 2.08 0.061 6 4.9 0.171 6 5.7 0.020 20 2.9 128.9 3.7 0.505
      9.1 0.80 758 1 051 1.43 14.20 0.049 0 4.2 0.145 7 4.9 0.021 59 2.6 137.7 3.5 0.526
      10.1 0.44 273 406 1.53 4.87 0.050 3 3.8 0.143 2 4.7 0.020 65 2.7 131.8 3.6 0.583
      注:206Pbc代表普通铅;206Pb*放射成因铅;γ代表误差相关系数;采用实测的204Pb进行普通铅校正.
      下载: 导出CSV

      表  2  大别山基性脉岩主量(%)及微量元素(10-6)分析结果

      Table  2.   Major and trace elemental data of basic dykes from the Dabie orogen

      样品 04-163-2 04-163-3 04-169-2 04TT-67-1 04BM-90 DB03M-2-2 03T-6 03Q-14-2 04-153-4 04-158-1 04-160-2
      SiO2 51.39 46.91 49.46 51.30 50.05 50.02 46.28 52.64 48.59 44.89 50.16
      TiO2 1.55 1.84 1.85 1.56 1.67 0.78 1.06 1.04 1.58 2.67 1.84
      Al2O3 14.52 14.02 14.81 15.64 15.72 10.84 14.44 14.28 16.25 14.36 14.60
      Fe2O3 2.94 3.09 3.94 2.67 3.16 2.74 1.29 2.80 4.22 7.35 3.56
      FeO 5.60 5.55 5.40 5.30 6.10 6.32 7.25 5.45 6.45 6.85 5.90
      TFeO 8.25 8.33 8.95 7.70 8.94 8.79 8.41 7.97 10.25 13.46 9.10
      MnO 0.12 0.04 0.14 0.14 0.16 0.17 0.13 0.16 0.15 0.14 0.14
      MgO 6.25 6.41 5.58 6.19 5.85 12.55 10.03 6.02 4.09 5.58 6.03
      CaO 6.67 8.50 7.45 6.67 6.90 8.54 5.86 6.86 4.63 9.64 6.72
      Na2O 2.99 3.54 2.89 3.68 3.67 1.74 2.05 2.29 2.15 2.34 3.69
      K2O 3.65 3.05 2.64 3.43 2.08 1.67 1.69 4.68 5.11 2.01 2.37
      P2O5 0.80 1.35 0.76 0.89 1.02 0.42 0.51 0.51 0.90 1.49 0.76
      H2O+ 2.18 2.06 2.57 2.00 2.76 3.26 5.07 1.90 3.56 2.25 2.64
      CO2 0.85 3.06 2.15 0.04 0.45 0.65 4.08 1.06 1.70 0.09 1.25
      Total 99.51 99.42 99.64 99.51 99.59 99.70 99.74 99.69 99.38 99.66 99.66
      Mg# 57.5 57.8 52.6 58.9 53.8 71.8 68.0 57.4 41.6 42.5 54.1
      δ 5.26 11.10 4.70 6.10 4.70 1.66 4.26 5.04 9.43 10.01 5.13
      Sc 17.6 17.5 17.7 18.1 20.1 20.3 29.0 25.9 17.5 38.8 18.4
      V 157 194 171 149 191 159 180 180 209 414 174
      Cr 222 228 211 138 148 750 980 332 20.0 3.9 242
      Co 33.7 32.9 34.0 26.7 30.9 49.5 49.2 29.4 27.3 51.1 34.9
      Ni 145 158 114 102 95.3 542 385 60.1 14.9 6.9 130
      Ga 18.3 18.9 18.9 17.8 18.5 15.7 17.3 17.3 20.8 23.1 18.8
      Rb 101 69.9 57.9 137 64.6 55.4 93.4 115 137 50.9 54.8
      Sr 1 106 1 320 964 1 275 1 028 644 590 593 769 800 866
      Y 23.3 22.3 20.6 23.4 26.4 14.0 17.2 19.9 26.3 33 20.2
      Zr 288 309 271 267 261 123 100 167 234 148 262
      Nb 21.6 25.1 20.9 27.1 24.6 11.2 8.4 9.4 12.7 10.4 20.4
      Cs 1.96 2.38 1.07 3.53 0.56 1.51 2.21 0.61 2.13 1.10 0.69
      Ba 2 490 2 100 1 393 2 137 1 873 679 1 016 1 247 4 341 1 033 1 162
      Hf 6.35 6.66 5.91 6.64 5.25 3.55 2.96 4.39 5.96 3.93 6.05
      Ta 2.89 3.56 3.21 4.33 3.48 0.93 0.56 0.91 0.80 0.67 1.21
      Pb 12.9 10.0 12.2 20.1 4.7 10.7 11.3 20.2 18.9 5.0 11.8
      Th 10.56 7.15 5.31 8.24 5.43 4.53 2.15 6.09 11.83 3.35 4.75
      U 1.75 1.21 0.82 1.37 0.95 0.80 0.45 1.48 1.87 0.47 0.72
      La 99.5 104.0 61.9 77.8 79.7 35.8 19.1 42.8 90.2 48.4 59.6
      Ce 185 219 124 156 153 79.4 48.0 84.6 166 106 121
      Pr 21.0 26.2 15.0 18.2 18.0 10.4 6.9 10.1 20.0 12.8 14.2
      Nd 75.6 96.3 57.2 68.3 66.6 40.8 29.3 40.1 75.0 58.6 53.8
      Sm 11.6 13.9 9.3 10.9 10.7 6.8 5.9 7.2 12.0 11.5 8.9
      Eu 3.00 3.67 2.59 2.93 2.94 1.99 1.82 2.16 3.71 3.25 2.49
      Gd 9.0 10.0 7.6 8.5 8.6 5.1 4.7 6.3 9.9 10.4 7.3
      Tb 1.02 1.08 0.90 1.04 1.06 0.61 0.62 0.79 1.25 1.30 0.85
      Dy 5.10 5.12 4.54 5.28 5.43 3.02 3.19 4.18 5.88 7.14 4.36
      Ho 0.91 0.89 0.82 0.97 1.02 0.56 0.62 0.79 1.09 1.33 0.78
      Er 2.37 2.21 2.13 2.63 2.71 1.53 1.61 2.25 2.75 3.31 1.97
      Tm 0.30 0.28 0.27 0.35 0.35 0.21 0.22 0.30 0.40 0.41 0.25
      Yb 1.74 1.63 1.54 2.18 2.06 1.25 1.35 1.94 2.19 2.34 1.42
      Lu 0.25 0.20 0.23 0.30 0.27 0.18 0.19 0.28 0.33 0.29 0.17
      ∑REE 415.84 484.08 287.53 355.28 352.03 187.66 123.56 203.80 390.76 267.37 277.09
      Nb/Ta 7.48 7.05 6.51 6.26 7.06 12.01 14.91 10.35 15.96 15.49 16.84
      (La/Yb)N 40.91 45.76 28.81 25.61 27.81 20.48 10.17 15.82 29.54 14.82 30.01
      Ba/Nb 115.40 83.59 66.63 78.94 76.26 60.67 121.61 132.27 341.33 99.56 56.89
      La/Nb 4.61 4.14 2.96 2.87 3.24 3.19 2.29 4.54 7.09 4.67 2.92
      Nb/U 12.34 20.79 25.44 19.82 25.93 13.94 18.56 6.36 6.82 21.94 28.26
      Zr/Nb 13.34 12.31 12.97 9.87 10.63 11.03 11.93 17.69 18.38 14.23 12.84
      Nb/Th 2.04 3.52 3.94 3.29 4.53 2.47 3.89 1.55 1.08 3.10 4.30
       
      Ba/Nb La/Nb Nb/U Zr/Nb Nb/Th
      N-type MORB 4.8 1.2 25.0 35.2 1.0 数据据文献Rollinson(1993)
      Average continental crust 54.4 2.2 10.0 16.2 18.3
      下载: 导出CSV

      表  3  大别山基性脉岩Sr、Nd同位素分析结果

      Table  3.   The Sr, Nd composition of basic dykes from the Dabie orogen

      样品号 Sm(10-6) Nd(10-6) Rb(10-6) Sr(10-6) 147Sm/144Nd 143Nd/144Nd
      04-163-2 11.603 75.549 101.176 1 105.52 0.096 0.511 889
      04-169-2 9.309 57.161 57.905 964.24 0.104 7 0.511 881
      04TT-67-1 10.876 68.272 137.197 1 275.34 0.098 2 0.511 85
      04BM-90 10.714 66.606 64.558 1 028.43 0.098 8 0.511 888
      DB03M-2-2 6.779 40.844 55.414 644.296 0.098 1 0.511 937
      03T-6 5.939 29.273 93.402 590.266 0.101 8 0.511 735
      03Q-14-2 7.204 40.115 115.438 592.906 0.107 6 0.511 806
      04-153-4 12.03 75.028 137.332 768.719 0.103 8 0.511 701
      04-158-1 11.459 58.644 50.858 799.563 0.124 5 0.511 611
      04-160-2 8.859 53.814 54.803 865.812 0.104 3 0.511 91
       
      样品号 87Rb/86Sr 87Sr/86Sr (87Sr/86Sr)i εNd(t) TDM(Ga)
      04-163-2 0.272 3 0.707 39 0.706 89 -12.95 1.63
      04-169-2 0.190 7 0.707 13 0.706 79 -13.24 1.77
      04TT-67-1 0.350 5 0.707 49 0.706 86 -13.74 1.71
      04BM-90 0.188 7 0.707 82 0.707 48 -13.01 1.67
      DB03M-2-2 0.242 6 0.705 98 0.705 54 -12.04 1.60
      03T-6 0.243 0.707 51 0.707 07 -16.05 1.92
      03Q-14-2 0.539 4 0.707 92 0.706 95 -14.76 1.92
      04-153-4 0.538 3 0.710 36 0.709 39 -16.74 2.00
      04-158-1 0.191 0.707 956 0.707 61 -18.84 2.62
      04-160-2 0.200 3 0.707 36 0.707 00 -12.67 1.72
      注:εNd(t)计算参数:(147Sm/144Nd)CHUR=0.196 7,(143Nd/144Nd)CHUR=0.512 638,t=130 Ma.
      下载: 导出CSV
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