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甘肃北山牛圈子地区志留纪骆驼圈西岩体的岩石成因及构造意义

余吉远 计波 郭琳

余吉远, 计波, 郭琳, 2017. 甘肃北山牛圈子地区志留纪骆驼圈西岩体的岩石成因及构造意义. 地质力学学报, 23 (2): 253-263.
引用本文: 余吉远, 计波, 郭琳, 2017. 甘肃北山牛圈子地区志留纪骆驼圈西岩体的岩石成因及构造意义. 地质力学学报, 23 (2): 253-263.
YU Ji-yuan, JI Bo, GUO Lin, 2017. THE PETROGENESIS AND TECTONIC SIGNIFICANCES OF SILURIAN WEST-LUOTOUJUAN ROCKS FROM BEISHAN NIUJUANZI AREA IN GANSU PROVINCE, NW CHINA. Journal of Geomechanics, 23 (2): 253-263.
Citation: YU Ji-yuan, JI Bo, GUO Lin, 2017. THE PETROGENESIS AND TECTONIC SIGNIFICANCES OF SILURIAN WEST-LUOTOUJUAN ROCKS FROM BEISHAN NIUJUANZI AREA IN GANSU PROVINCE, NW CHINA. Journal of Geomechanics, 23 (2): 253-263.

甘肃北山牛圈子地区志留纪骆驼圈西岩体的岩石成因及构造意义

基金项目: 

中国地质调查局地质调查项目“特殊地质地貌区填图试点” DD20160060

国家自然科学基金中天山阿拉塔格环状杂岩体成因研究 41202045

中国地质大调查项目甘肃北山牛圈子地区6幅1:5万区域地质调查 12120113046400

详细信息
    作者简介:

    余吉远(1978-),男,高级工程师,从事区域地质矿产调查、岩石地球化学研究。E-mail:yujiyuan111@163.com

  • 中图分类号: P595, P597

THE PETROGENESIS AND TECTONIC SIGNIFICANCES OF SILURIAN WEST-LUOTOUJUAN ROCKS FROM BEISHAN NIUJUANZI AREA IN GANSU PROVINCE, NW CHINA

  • 摘要: 北山牛圈子地区的骆驼圈西埃达克岩为过铝质钙碱性岩浆系列,具有高的SiO2(>57.94%)、Al2O3(>16.66%)和低的MgO( < 4.32%)含量, 较高的Na2O/K2O比值(>3.13),显示富钠的特征; 而在微量元素上,高Sr(589×10-6~1170×10-6),低Y (4.60×10-6~13.90×10-6)和Yb (0.43×10-6~1.32×10-6);轻重稀土分异明显(La/Dy)N=4.60~13.87、(La/Yb)N=7.17~20.58,Eu异常不明显(Eu/Eu*=0.85~1.32);富集轻稀土和大离子亲石元素,而亏损高场强元素Nb,Ta,Ti和重稀土HREE,与世界上典型的俯冲洋壳熔融形成的埃达克岩特征相似。结合区域上埃达克岩的研究成果和岀露的构造位置,以及与牛圈子蛇绿岩的关系,认为骆驼圈西埃达克岩是志留纪(U-Pb年龄为428.9 Ma)时期热的洋壳向公婆泉—东七一山早古生代活动陆缘带俯冲过程中部分熔融的产物。对该岩体的研究,为进一步研究北山造山带早古生代北山洋盆闭合和晚古生代北山洋盆重新裂开提供新的依据。

     

  • 图  1  牛圈子地区地质简图[22]

    Figure  1.  Geological sketch in Niujuanzi area

    图  2  石英闪长岩和英云闪长岩镜下照片

    Figure  2.  Microscope photographs of Quartz diorite and Tonalite

    图  3  骆驼圈西岩体主量元素地球化学特征

    Figure  3.  Covariation diagram of selected major oxides MgO, CaO and Na2O/K2O versus SiO2 in West-Luotuojuan Rocks

    图  4  骆驼圈西岩体位微量元素蛛网图和稀土元素配分曲线[24]

    Figure  4.  Primitive mantle normalized trace elements spider diagrams and chondrite normalized REE distribution patterns of West-Luotuojuan Rocks

    图  5  代表性锆石CL图像

    Figure  5.  CL images of representative zircons

    图  6  单颗粒锆石的谐和图及206Pb/238U加权平均年龄直方图

    Figure  6.  Concordia diagram and weighted average 206Pb/238U age for single-grain zircon from West-Luotuojuan rocks

    图  7  骆驼圈西岩体Sr/Y-Y和(La/Yb)N-YbN判别图[2]

    Figure  7.  Discrimination diagram of Sr/Y-Y and (La/Yb)N-YbN for West-Luotuojuan rocks

    图  8  埃达克岩与玄武岩的实验熔融体的SiO2-MgO图解[29]

    Figure  8.  SiO2-MgO diagrams of the experimental melt of adakite and the basalts

    图  9  骆驼圈西岩体Y-Nb图和R1-R2图

    Figure  9.  Y-Rb relation of the granites and R1-R2 diagram of West-Luotuojuan rocks

    表  1  牛圈子地区埃达克岩主量(%)与微量元素(10-6)化学分析结果

    Table  1.   Major and trace element compositions of the adakite from Niujuanzi region

    sample岩性 131042 131062 131044 131064 132001 131061 131012 131041
    英云闪长岩 石英闪长岩
    SiO2 69.17 66.68 67.70 66.87 65.10 57.94 60.16 60.54
    TiO2 0.25 0.34 0.35 0.31 0.36 0.86 0.67 0.67
    Al2O3 16.59 17.42 16.66 17.35 17.32 18.49 17.05 17.10
    Fe2O3 0.90 1.14 1.15 1.18 1.83 1.99 1.86 1.84
    FeO 1.37 1.72 1.88 1.56 1.42 2.79 3.79 3.49
    MnO 0.05 0.05 0.06 0.05 0.06 0.08 0.09 0.10
    MgO 0.97 1.35 1.37 1.27 1.54 4.32 3.61 3.33
    CaO 3.86 4.46 4.48 4.70 4.63 7.58 6.47 5.69
    K2O 1.03 1.26 1.20 1.07 0.81 0.94 0.92 1.21
    Na2O 4.64 4.73 4.24 4.57 4.85 3.33 3.60 3.77
    P2O5 0.11 0.13 0.14 0.13 0.13 0.13 0.19 0.21
    LOI 0.89 0.51 0.55 0.77 1.79 1.22 1.15 1.63
    total 99.84 99.79 99.78 99.82 99.84 99.67 99.56 99.57
    AR 1.77 1.75 1.69 1.69 1.69 1.39 1.48 1.56
    A/CNK 1.74 1.67 1.68 1.68 1.68 1.56 1.55 1.6
    Mg # 0.44 0.47 0.46 0.46 0.47 0.63 0.54 0.54
    Cr 8.5 8.9 14 9.8 11.7 34.9 55.4 48.9
    Ni 5.55 7.94 10.4 7.05 13.2 18.7 46 40.8
    V 39.2 54.4 51.4 50.5 59.7 112 147 121
    Sc 4.82 5.21 5.22 5.25 7.28 12.1 14.5 15
    Co 5.99 8 8.49 7.43 9.34 18.2 20.5 19.6
    Rb 21.5 29.1 25.8 16.3 13 20.1 23.5 37.6
    Cs 1 2.28 1.46 1.34 0.76 0.8 1.26 1.74
    Sr 595 654 602 695 694 1170 592 589
    Ba 313 355 408 407 277 191 272 315
    Ga 17.4 18.7 17.9 18.1 18.3 19.3 19.3 19.1
    Pb 12.6 12 9.02 11.3 9.6 6.89 10.1 10.2
    U 0.57 0.62 0.58 0.47 0.52 0.44 1.06 1.56
    Th 4.05 1.17 3.79 1.5 1.99 1.08 4.32 4.76
    Nb 2.36 2.36 3.11 1.92 2.42 2.54 3.42 5.38
    Ta 0.22 0.22 0.28 0.18 0.15 0.2 0.29 0.43
    Zr 84.1 74.5 103 63.3 90.1 79.3 129 88.9
    Hf 2.79 2.1 2.86 1.69 2.57 2.47 3.44 2.65
    Y 5.05 5.22 6.41 4.6 6.93 10.9 13 13.9
    La 13.2 6.47 11.6 8.58 7.56 10 12.9 16.8
    Ce 26.5 14 23.9 18.2 17.6 24.8 29.5 38.2
    Pr 3.28 1.72 2.8 2.13 2.43 3.32 3.85 5.03
    Nd 11.2 7.29 10.6 8.17 10 13.5 15.6 19.6
    Sm 2.19 1.81 2.19 1.62 2.13 2.91 3.76 4.31
    Eu 0.56 0.65 0.8 0.67 0.69 1.08 1.1 1.12
    Gd 1.53 1.47 1.8 1.42 1.78 2.65 3.28 3.57
    Tb 0.2 0.19 0.25 0.18 0.25 0.4 0.48 0.52
    Dy 1.02 1.03 1.42 0.97 1.46 2.33 2.72 2.96
    Ho 0.18 0.2 0.24 0.19 0.29 0.44 0.52 0.54
    Er 0.47 0.5 0.64 0.48 0.71 1.1 1.32 1.41
    Tm 0.06 0.08 0.09 0.07 0.10 0.16 0.20 0.21
    Yb 0.46 0.47 0.64 0.43 0.65 1 1.29 1.32
    Lu 0.059 0.074 0.076 0.066 0.093 0.14 0.19 0.2
    ∑REE 60.91 35.95 57.04 43.17 45.74 63.83 76.71 95.79
    LREE 56.93 31.94 51.89 39.37 40.41 55.61 66.71 85.06
    HREE 3.98 4.01 5.15 3.80 5.33 8.22 10.00 10.73
    Eu/Eu * 0.89 1.18 1.20 1.32 1.05 1.17 0.94 0.85
    (La/Yb) N 20.58 9.87 13 14.31 8.34 7.17 7.17 9.13
    (Ho/Yb) N 1.18 1.28 1.13 1.33 1.34 1.32 1.21 1.23
    (La/Dy) N 13.87 6.73 8.75 9.48 5.55 4.60 5.08 6.08
    Eu/Eu*=EuN/(SmN×GdN)1/2,(La/Yb)N、(Ho/Yb)N、(La/Dy)N is ratio of Chondrite [24]
    下载: 导出CSV

    表  2  北山造山带骆驼圈西英云闪长岩锆石U-Pb同位素分析结果

    Table  2.   LA-ICP-MS U-Pb zircons dating results of sample (132053) from West-Luotuojuan in Beishan orogen

    Analysis_# Th U Th/U Pb207/Pb206 Pb207/U235 Pb206/U238 Pb208/Th232 Pb207/U235 Pb206/U238 Pb208/Th232
    ratio 1sigma ratio 1sigma ratio 1sigma ratio 1sigma ratio 1sigma ratio 1sigma ratio 1sigma
    132053-01 81.69 3550.82 0.02 0.05571 0.00092 0.43564 0.00730 0.05672 0.00079 0.04629 0.00186 367.2 5.16 355.6 4.8 914.5 35.84
    132053-02 28.94 1223.24 0.02 0.05675 0.00089 0.44718 0.00720 0.05715 0.00077 0.02215 0.00060 375.3 5.05 358.3 4.69 442.9 11.95
    132053-03 157.31 4170.61 0.04 0.05856 0.00099 0.46470 0.00796 0.05755 0.00081 0.03784 0.00155 387.5 5.52 360.7 4.92 750.6 30.28
    132053-04 50.28 2494.59 0.02 0.05756 0.00095 0.46393 0.00781 0.05845 0.00080 0.02060 0.00064 387 5.41 366.2 4.89 412.1 12.6
    132053-05 223.89 2183.09 0.10 0.10248 0.00165 0.84796 0.01387 0.06001 0.00083 0.06666 0.00205 623.5 7.62 375.7 5.07 1304.4 38.86
    132053-06 503.50 554.08 0.91 0.05582 0.00092 0.52517 0.00878 0.06823 0.00093 0.02101 0.00057 428.6 5.84 425.5 5.62 420.3 11.22
    132053-07 197.21 450.71 0.44 0.05550 0.00103 0.52273 0.00967 0.06831 0.00097 0.02156 0.00070 427 6.45 426 5.88 431.2 13.79
    132053-08 366.42 421.73 0.87 0.05524 0.00117 0.52042 0.01076 0.06833 0.00102 0.02038 0.00063 425.4 7.18 426.1 6.16 407.9 12.45
    132053-09 205.79 313.27 0.66 0.05508 0.00099 0.51935 0.00935 0.06838 0.00097 0.02067 0.00062 424.7 6.25 426.4 5.83 413.5 12.19
    132053-10 184.73 419.12 0.44 0.05537 0.00097 0.52254 0.00920 0.06844 0.00096 0.02217 0.00067 426.8 6.14 426.8 5.76 443.3 13.25
    132053-11 425.11 672.40 0.63 0.05454 0.00089 0.51680 0.00858 0.06872 0.00093 0.02161 0.00059 423 5.74 428.5 5.64 432.1 11.71
    132053-12 166.55 281.16 0.59 0.05709 0.00120 0.54205 0.01111 0.06885 0.00103 0.02243 0.00074 439.8 7.32 429.2 6.2 448.3 14.65
    132053-13 257.49 655.48 0.39 0.05789 0.00147 0.55007 0.01334 0.06891 0.00114 0.01945 0.00132 445 8.74 429.6 6.85 389.4 26.22
    132053-14 431.94 865.59 0.50 0.05818 0.00118 0.55336 0.01103 0.06899 0.00103 0.02131 0.00217 447.2 7.21 430.1 6.23 426.1 42.92
    132053-15 206.52 355.68 0.58 0.06019 0.00129 0.57471 0.01196 0.06925 0.00106 0.02185 0.00076 461.1 7.71 431.6 6.37 436.9 15.01
    132053-16 65.00 248.92 0.26 0.06119 0.00120 0.58951 0.01143 0.06987 0.00102 0.02470 0.00101 470.6 7.3 435.4 6.15 493.2 19.97
    132053-17 54.30 125.52 0.43 0.06421 0.00193 0.61913 0.01749 0.06994 0.00128 0.02492 0.00119 489.3 10.97 435.8 7.72 497.6 23.43
    下载: 导出CSV
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  • 收稿日期:  2016-11-03
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