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西藏狮泉河地区晚侏罗世中性侵入岩锆石U-Pb年龄、地球化学特征及构造意义

尼玛次仁 王国灿 顿都 普尺 次仁央宗 焦文龙 李开云 叶强 洛桑朗杰 达娃

尼玛次仁, 王国灿, 顿都, 等, 2017. 西藏狮泉河地区晚侏罗世中性侵入岩锆石U-Pb年龄、地球化学特征及构造意义. 地质力学学报, 23 (5): 673-685.
引用本文: 尼玛次仁, 王国灿, 顿都, 等, 2017. 西藏狮泉河地区晚侏罗世中性侵入岩锆石U-Pb年龄、地球化学特征及构造意义. 地质力学学报, 23 (5): 673-685.
NIMA Ciren, WANG Guocan, DU Dun, et al., 2017. ZIRCON U-PB AGES, GEOCHEMICAL CHARACTERISTICS AND TECTONICS IMPLICATIONS OF LATE JURASSIC INTERMEDIATE INTRUSIVE ROCKS IN SHIQUANHE AREA, WESTERN TIBET. Journal of Geomechanics, 23 (5): 673-685.
Citation: NIMA Ciren, WANG Guocan, DU Dun, et al., 2017. ZIRCON U-PB AGES, GEOCHEMICAL CHARACTERISTICS AND TECTONICS IMPLICATIONS OF LATE JURASSIC INTERMEDIATE INTRUSIVE ROCKS IN SHIQUANHE AREA, WESTERN TIBET. Journal of Geomechanics, 23 (5): 673-685.

西藏狮泉河地区晚侏罗世中性侵入岩锆石U-Pb年龄、地球化学特征及构造意义

基金项目: 

中国地质调查局青藏专项《西藏1: 5万噶尔地区6幅区域地质调查》 1212011121232

中国地质调查局青藏专项《西藏1: 5万噶尔地区6幅区域地质调查》 1212011221057

详细信息
    作者简介:

    尼玛次仁(1970-), 男, 博士生, 高级工程师, 从事区域地质调查工作。E-mail:1940627805@qq.com

  • 中图分类号: P597.3;P588.12

ZIRCON U-PB AGES, GEOCHEMICAL CHARACTERISTICS AND TECTONICS IMPLICATIONS OF LATE JURASSIC INTERMEDIATE INTRUSIVE ROCKS IN SHIQUANHE AREA, WESTERN TIBET

  • 摘要: 侵位于狮泉河结合带南缘和结合带南侧古生代地层的晚白垩世侵入岩中,解体出一套中性侵入岩,呈岩珠、岩枝状产出,主要岩石类型为石英闪长岩、英云闪长岩和花岗闪长岩,其中石英闪长岩和英云闪长岩的LA-ICP-MS锆石U-Pb年龄为157.3±1.5 Ma(MSWD=0.96)和159.3±3.7 Ma(MSWD=2.30),指示岩浆活动时间为晚侏罗世牛津期。该岩体SiO2含量在59.65%~64.57%之间,K2O为1.95%~2.69%之间,Na2O为1.97%~3.42%,K2O/Na2O在0.74~1.29之间,P2O5为0.085%~0.139%之间,Al2O3为13.63%~15.68%之间,A/CNK为0.89~1.07,属于准铝质—弱过铝质花岗岩。岩石稀土元素总量(∑REE)为107.37×10-6~148.33×10-6,LREE/HREE在6.77~9.67之间,轻重稀土分异程度强,δEu为0.63~0.84,铕略具负异常;在原始地幔标准化蛛网图上,富Rb、Th等大离子亲石元素(LILE)而亏损Nb、Ta、Ti和P等高场强元素(HFSE),具有岛弧钙碱性岩浆的地球化学性质。从岩石学、岩石地球化学特征研究表明,该时期岩石显示同源岩浆演化的特征,具有典型I型花岗岩特征,形成于板块俯冲下的岛弧环境。表明狮泉河一带在晚侏罗世已经存在俯冲型花岗岩,研究认为该时期岩浆活动很可能是狮泉河洋盆北缘(北亚带)持续扩张时,向南缘(南亚带)及中冈底斯带北缘俯冲的产物。

     

  • 图  1  研究区地质简图

    (据文献[7]修编)

    Figure  1.  Simplified geological map(according to regional geological survey of 1: 50000 in Gaer area, Tibet)

    图  2  岩石宏观地质特征及显微矿物特征

    a-为石英闪长岩宏观地质特征;b-为石英闪长岩显微矿物特征;c-为英云闪长岩宏观地质特征;d-为英云闪长岩显微矿物特征;e-为花岗闪长岩宏观地质特征;f-为花岗闪长岩显微矿物特征;Q-石英;P-斜长石;Am-角闪石

    Figure  2.  Field and photomicrographs of representative samples of the Shiquanhe area, Tibet

    图  3  锆石阴极发光(CL)图像

    Figure  3.  Cathodoluminescence image of zircons from the Shiquanhe area

    图  4  锆石U-Pb年龄谐和图

    a-谐和图;b-加权平均年龄图

    Figure  4.  U-Pb Concordia diagrams of zircons from the granodirites in the Shiquanhe area

    图  5  狮泉河地区中性侵入岩TAS分类图解

    Figure  5.  TAS classification diagram of the intermediate intrusive rocks in the Shiquanhe area

    图  6  狮泉河地区中性侵入岩球粒陨石标准化稀土元素配分曲线图(a)和原始地幔标准化微量元素蛛网图(b)

    (球粒陨石及原始地幔标准值据文献[19])

    Figure  6.  Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spider diagrams (b) of the Shiquanhe intermediate intrusive rocks(Chonodrite values and primitive mantle after Sun and Donough, 1989)

    图  7  狮泉河地区中性侵入岩P2O5-SiO2图解

    Figure  7.  P2O5-SiO2 diagram of the Shiquanhe intermediate intrusive rocks

    图  8  狮泉河地区中性侵入岩K2O-SiO2图解

    Figure  8.  K2O-SiO2 diagram of the Shiquanhe intermediate intrusive rocks

    图  9  狮泉河地区中性侵入岩Rb-Yb+Ta图解(a)和Yb-Ta图解(b)

    (据Pearce et al.[23])

    Figure  9.  Rb vs.Yb+Ta diagram (a) and Yb vs.Ta diagram (b) of the Shiquanhe intermediate intrusive rocks

    图  10  狮泉河地区中性侵入岩YbN-(La/Yb)N图解(a)和Y-Sr/Y图解(b)

    (据Defant and Drummond,1990[25])

    Figure  10.  YbN vs. (La/Yb)N diagram (a) and Y vs. Sr/Y diagram (b) of the Shiquanhe intermediate intrusive rocks

    (modified after Defant and Drummond, 1990)

    图  11  狮泉河地区中性侵入岩La/Yb-La、La/Sm-La、Mg#-Ni及Cr-Ni图解

    (图中俯冲板片熔融范围据Guan et al.[26]和张连昌等[27];增厚下地壳熔融范围据Guan et al.[26]和Hou et al.[28])

    Figure  11.  Diagrams of La/Yb vs. La, La/Sm vs. La, Mg# vs. Ni, and Cr vs. Ni of the Shiquanhe intermediate intrusive rocks

    (Field of subducted oceanic slab derived adakites is from Guan et al.(2012)[26]and Zhang et al.(2004)[27]; field of thickened lower crust derived adakites is from Guan et al.(2012)[26]and Hou et al.(2013)[28])

    表  1  石英闪长岩(D3052)、英云闪长岩(D2087)LA-ICP-MS锆石U-Pb年代学分析结果

    Table  1.   LA-ICP-MS zircon U-Pb analysis results of quartz diorites(D3015)and tonalities(D2087)from the Shiquanhe area, Tibet

    测点号 WB/10-6 Th/U 同位素比值 年龄/Ma
    Th U 207Pb/206Pb(1σ) 207Pb/235U(1σ) 206Pb/238U(1σ) 206Pb/238U(1σ) 207Pb/235U(1σ) 208Pb/232Th(1σ)
    D3052-01 120 145 0.83 0.0655(0.0056) 0.2131(0.0156) 0.0252(0.0006) 160(4) 196(13) 157(8)
    D3052-02 172 218 0.79 0.0579(0.0035) 0.1994(0.0121) 0.0249(0.0005) 158(3) 185(10) 168(13)
    D3052-03 182 192 0.95 0.0684(0.0059) 0.2394(0.0237) 0.0255(0.0005) 162(3) 218(19) 162(7)
    D3052-04 66.3 107 0.62 0.1216(0.0196) 0.4115(0.0720) 0.0246(0.0006) 157(4) 350(52) 166(13)
    D3052-05 126 160 0.79 0.0646(0.0057) 0.2144(0.0190) 0.0250(0.0005) 159(3) 197(16) 145(8)
    D3052-06 190 205 0.92 0.0499(0.0035) 0.1775(0.0129) 0.0256(0.0005) 163(3) 166(11) 178(34)
    D3052-07 117 142 0.83 0.0714(0.0055) 0.2293(0.0172) 0.0248(0.0006) 158(4) 210(14) 156(8)
    D3052-08 153 197 0.78 0.0662(0.0055) 0.2186(0.0174) 0.0245(0.0005) 156(3) 201(14) 147(7)
    D3052-09 156 190 0.82 0.0644(0.0046) 0.2190(0.0147) 0.0251(0.0005) 160(3) 201(12) 151(7)
    D3052-10 175 203 0.86 0.0559(0.0040) 0.1805(0.0119) 0.0239(0.0005) 152(3) 168(10) 141(6)
    D3052-11 168 212 0.79 0.1036(0.0396) 0.3467(0.1374) 0.0246(0.0005) 157(3) 302(104) 157(7)
    D3052-12 110 104 1.06 0.0915(0.0081) 0.2958(0.0246) 0.0244(0.0006) 155(4) 263(19) 159(9)
    D3052-13 115 147 0.78 0.0784(0.0065) 0.2467(0.0194) 0.0242(0.0006) 154(4) 224(16) 158(10)
    D3052-14 131 169 0.78 0.0692(0.0052) 0.2293(0.0157) 0.0250(0.0006) 159(4) 210(13) 148(8)
    D3052-15 137 170 0.80 0.0742(0.0064) 0.2449(0.0221) 0.0245(0.0005) 156(3) 222(18) 155(8)
    D3052-16 126 155 0.82 0.0690(0.0046) 0.2312(0.0154) 0.0241(0.0005) 154(3) 211(13) 178(9)
    D3052-17 115 120 0.96 0.0822(0.0057) 0.2797(0.0181) 0.0250(0.0006) 159(4) 250(14) 167(8)
    D3052-18 161 221 0.73 0.0887(0.0230) 0.3024(0.0805) 0.0244(0.0004) 155(3) 268(63) 160(7)
    D2087-08 167 224 0.74 0.0616(0.0039) 0.2211(0.0155) 0.0258(0.0006) 164(3) 203(13) 158(7)
    D2087-09 421 598 0.70 0.0614(0.0033) 0.2186(0.0123) 0.0255(0.0004) 162(2) 201(10) 187(9)
    D2087-11 129 176 0.73 0.0636(0.0051) 0.2017(0.0156) 0.0243(0.0005) 155(3) 187(13) 158(8)
    D2087-12 132 175 0.75 0.0600(0.0043) 0.1909(0.0125) 0.0244(0.0006) 156(4) 177(11) 147(7)
    D2087-13 166 201 0.83 0.1096(0.0089) 0.3746(0.0304) 0.0252(0.0006) 160(4) 323(22) 255(14)
    D2087-14 117 157 0.74 0.0728(0.0069) 0.2422(0.0198) 0.0256(0.0005) 163(3) 220(16) 158(9)
    D2087-15 235 496 0.47 0.0514(0.0031) 0.1768(0.0101) 0.0250(0.0004) 159(2) 165(9) 160(7)
    D2087-18 133 180 0.74 0.0612(0.0046) 0.2090(0.0153) 0.0255(0.0006) 163(3) 193(13) 161(8)
    下载: 导出CSV

    表  2  狮泉河地区中性侵入岩主量、微量和稀土元素分析结果及部分标准矿物特征参数

    Table  2.   Analysis results of major elements, REE, trace/elements, and characteristic parameters of some CIPW data of the Shiquanhe intermediate intrusive rocks

    样品号 10-2 Mg# 10-2
    SiO2 TiO2 Al2O3 Fe2O3 FeO MnO MgO CaO Na2O K2O P2O5 LOI 总和 Q An Ab
    D3052 62.21 0.55 14.32 1.31 4.39 0.12 4.7 4.94 2.15 2.3 0.096 2.68 99.77 60.07 21.62 23.31 18.74
    D7206 61.58 0.57 13.63 0.83 5.26 0.13 5 5.17 1.97 2.54 0.103 2.96 99.74 59.74 19.92 21.54 17.22
    D0016 62.05 0.54 15.25 1.01 4.3 0.11 3.69 5.76 2.18 2.1 0.1 2.66 99.75 55.81 22.01 26.39 19
    D0017 64.57 0.43 15.2 1.06 3.17 0.08 3.16 5.36 2.3 2.46 0.085 1.9 99.78 57.74 24.82 24.4 19.88
    D1070 59.65 0.62 15.6 1.12 5.01 0.12 4.58 5.66 2.38 2.12 0.139 2.72 99.72 57.57 16.55 26.41 20.76
    D1086 62.04 0.54 14.88 1.34 4.16 0.12 3.92 4.56 2.66 2.44 0.11 3 99.77 56.57 20 22.17 23.26
    D2045 60.56 0.59 15.68 0.88 5.31 0.14 3.56 6.28 2.02 2.2 0.104 2.46 99.77 51.00 19.36 27.97 17.56
    D2087 61.23 0.56 15.37 1.18 4.88 0.14 3.77 3.4 3.42 2.52 0.12 3.17 99.77 53.08 16.35 16.62 29.96
    D3262 62.42 0.56 14.57 0.22 5.2 0.12 4.57 4.26 2.54 1.95 0.105 3.28 99.79 60.15 21.34 21.19 22.27
    D7214 63.75 0.49 14.32 1.05 3.86 0.1 3.77 5.26 2.08 2.51 0.098 2.48 99.77 58.31 24.22 22.95 18.09
    D1281 63.83 0.48 14.77 0.81 4.11 0.11 4.08 3.65 2.57 2.69 0.1 2.57 99.77 60.04 22.75 17.94 22.37
    样品号 10-2 A/CNK σ43 10-6
    Or C Di Rb Ba Th U Ta Nb Sr Zr Hf Ni Cr La
    D3052 14 0 1.05 0.954 1 84.8 326 12.4 1.07 0.98 10.6 167 110 3.32 33 200 26
    D7206 15.51 0 3.48 0.886 1.05 94.2 374 11.5 0.82 0.8 9.66 150 124 2.78 35.4 161 25.3
    D0016 12.78 0 1.94 0.934 0.93 82.2 386 13.3 1.31 0.97 10.4 214 119 3.44 18.6 64.2 35.3
    D0017 14.85 0 1.78 0.939 1.03 107 376 11.8 1.1 0.88 9.52 176 102 2.86 24.6 114 27.8
    D1070 12.92 0 1.32 0.945 1.16 88.4 480 9.99 1.04 0.9 11 244 120 3.71 27.5 115 30
    D1086 14.9 0 0.38 0.972 1.32 100 414 12.1 2.3 1.02 10.7 194 152 4.46 25.1 74.3 27
    D2045 13.36 0 2.76 0.916 0.98 77.4 346 9.23 1.45 0.95 10.3 217 115 3.73 9.24 41.2 26.4
    D2087 15.42 1.17 0 1.057 1.85 108 493 10.2 1.01 0.92 9.82 280 102 3.02 10.3 45.8 23.2
    D3262 11.94 0.82 0 1.038 1 66.9 338 10 0.87 1 10.9 202 135 4.02 41.1 159 24.2
    D7214 15.25 0 2.62 0.912 0.99 99.6 376 12.7 0.8 0.84 9.28 154 116 3.55 26 118 27.1
    D1281 16.35 1.27 0 1.072 1.29 73.3 364 6.54 0.89 1.07 10.7 204 159 4.75 29.4 159 21.5
    样品号 10-6 LREE/HREE δEu
    Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y ∑REE
    D3052 52 5.99 21.8 4.14 0.94 4.18 0.76 3.59 0.79 2.53 0.42 2.3 0.37 26.3 125.81 7.42 0.68
    D7206 51.6 5.7 20.4 3.97 0.89 3.93 0.72 4.2 0.85 2.58 0.41 2.5 0.46 23 123.51 6.89 0.68
    D0016 63.4 6.67 23 4.27 1.03 4.27 0.76 3.46 0.76 2.44 0.4 2.21 0.36 27.3 148.33 9.12 0.73
    D0017 50.2 5.19 17.5 3.1 0.86 3.1 0.54 2.54 0.56 1.84 0.3 1.67 0.27 20.3 115.47 9.67 0.84
    D1070 58.8 6.7 24.6 4.62 1.12 4.6 0.82 3.81 0.86 2.68 0.46 2.39 0.4 29.2 141.86 7.86 0.73
    D1086 51 5.81 21 4.16 0.93 4.05 0.72 3.36 0.73 2.36 0.4 2.14 0.34 25.4 124 7.79 0.68
    D2045 52.2 6.16 22.9 4.46 1.05 4.57 0.83 3.98 0.87 2.86 0.49 2.62 0.42 29.5 129.81 6.8 0.7
    D2087 44.7 5.23 19.2 4.05 1.03 4.05 0.78 3.68 0.8 2.62 0.44 2.39 0.39 26.8 112.56 6.43 0.77
    D3262 48.1 5.92 21.8 4.37 0.9 4.22 0.79 3.73 0.81 2.69 0.44 2.48 0.4 27.1 120.85 6.77 0.63
    D7214 52.0 5.53 18.9 3.54 0.88 3.54 0.61 3.71 0.76 2.4 0.36 2.36 0.39 21.1 122.08 7.64 0.75
    D1281 42.4 5.18 19.2 3.91 0.96 3.79 0.73 3.47 0.76 2.44 0.41 2.25 0.37 23.2 107.37 6.55 0.75
    下载: 导出CSV
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  • 收稿日期:  2016-12-10
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