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东昆仑鄂拉山岩浆带晚三叠世后碰撞伸展:来自索拉沟高分异I型花岗岩的证据

周红智 魏俊浩 石文杰 张松涛 陈加杰 张新铭 沈志远 王艺龙 曾闰灵

周红智, 魏俊浩, 石文杰, 张松涛, 陈加杰, 张新铭, 沈志远, 王艺龙, 曾闰灵. 东昆仑鄂拉山岩浆带晚三叠世后碰撞伸展:来自索拉沟高分异I型花岗岩的证据[J]. 地质科技通报, 2020, 39(4): 150-164. doi: 10.19509/j.cnki.dzkq.2020.0430
引用本文: 周红智, 魏俊浩, 石文杰, 张松涛, 陈加杰, 张新铭, 沈志远, 王艺龙, 曾闰灵. 东昆仑鄂拉山岩浆带晚三叠世后碰撞伸展:来自索拉沟高分异I型花岗岩的证据[J]. 地质科技通报, 2020, 39(4): 150-164. doi: 10.19509/j.cnki.dzkq.2020.0430
Zhou Hongzhi, Wei Junhao, Shi Wenjie, Zhang Songtao, Chen Jiajie, Zhang Xinming, Shen Zhiyuan, Wang Yilong, Zeng Runling. Late Triassic post-collision extension at Elashan magmatic belt, East Kunlun Orogenic Belt: Insights from Suolagou highly fractionated I-type granite[J]. Bulletin of Geological Science and Technology, 2020, 39(4): 150-164. doi: 10.19509/j.cnki.dzkq.2020.0430
Citation: Zhou Hongzhi, Wei Junhao, Shi Wenjie, Zhang Songtao, Chen Jiajie, Zhang Xinming, Shen Zhiyuan, Wang Yilong, Zeng Runling. Late Triassic post-collision extension at Elashan magmatic belt, East Kunlun Orogenic Belt: Insights from Suolagou highly fractionated I-type granite[J]. Bulletin of Geological Science and Technology, 2020, 39(4): 150-164. doi: 10.19509/j.cnki.dzkq.2020.0430

东昆仑鄂拉山岩浆带晚三叠世后碰撞伸展:来自索拉沟高分异I型花岗岩的证据

doi: 10.19509/j.cnki.dzkq.2020.0430
基金项目: 

国家自然科学基金项目 41772071

中国地质调查局项目 DD20190159-05

详细信息
    作者简介:

    周红智(1991-), 男, 现正攻读矿产普查与勘探博士学位, 主要从事花岗岩与成矿及矿产勘查研究工作。E-mail:zhzszxs@163.com

    通讯作者:

    石文杰(1985-), 男, 讲师, 主要从事矿产勘查研究工作。E-mail:swjhaoo@126.com

  • 中图分类号: P588.12

Late Triassic post-collision extension at Elashan magmatic belt, East Kunlun Orogenic Belt: Insights from Suolagou highly fractionated I-type granite

  • 摘要: 鄂拉山岩浆带位于东昆仑造山带最东端,为研究该地区晚三叠世的构造背景,选取索拉沟地区钾长花岗岩开展研究。LA-ICP-MS锆石U-Pb定年结果显示,索拉沟钾长花岗岩加权平均年龄为(233±1)Ma,形成于晚三叠世早期。该岩石有很高的w(SiO2)(75.91%~77.23%)、富K2O和Na2O,贫CaO、MgO、TiO2和P2O5,A/CNK介于1.01~1.05,属高钾钙碱性系列,锆石饱和温度733~768℃,具有强烈的Eu负异常(Eu/Eu*=0.09~0.25),明显富集大离子亲石元素(LILE Rb、Th、U、K等)和轻稀土元素(LREE),亏损Ba、Sr及Nb、P、Zr、Ti等高场强元素(HFSE),显示高分异I型花岗岩的特征。锆石Hf同位素初始值(176Hf/177Hf)范围为0.282 487~0.282 611,εHft)介于-3.54~-0.56;对应的两阶段模式年龄T2DM(Hf)为1.16~1.33 Ga。索拉沟钾长花岗岩是新生下地壳部分熔融后经过分离结晶作用形成,新生下地壳是幔源岩浆在特提斯洋俯冲阶段(242~238 Ma)底侵古老地壳形成。结合晚古生代至中生代东昆仑地区的构造演化特征,认为索拉沟钾长花岗岩形成于张性构造背景,与古特提斯洋俯冲结束后巴颜喀拉地体与东昆仑地体后碰撞造山伸展作用有关。

     

  • 图 1  中央造山系略图(a),东昆仑造山带(b)及鄂拉山岩浆带中段(c)地质简图和研究区采样位置简图(d)

    a据文献[3]修改; b据文献[10, 23]修改; c, d据文献[24]修改;a中QXM为祁漫塔格-香日德蛇绿混杂岩带;AKM为阿其克库勒湖-昆中蛇绿混杂岩带;BAM为布青山-阿尼玛卿蛇绿混杂岩岩带;c中什多龙岩体年龄据文献[25],其余岩体年龄据文献[5]

    Figure 1.  Geological sketch of the Central Orogenic Belt(a), geological map of East Kunlun Orogenic Belt(b), geological map of Elashan magmatic belt(c) and geological map of the study area(d)

    图 2  鄂拉山岩浆带索拉沟钾长花岗岩野外露头、标本及镜下照片(正交偏光)

    a.地表钾长花岗岩露头;b~c.新鲜钾长花岗岩手标本;d~f.样品显微镜镜下照片(正交偏光);Bt.黑云母;Kfs.钾长石;Pl.斜长石;Q.石英

    Figure 2.  Field photographs, sample and microphotographs of syenogranite from Suolagou area, Elashan magmatic belt

    图 3  鄂拉山岩浆带索拉沟钾长花岗岩中(SLG-4)锆石阴极发光(CL)图像

    实心圆圈和黄色虚线圆圈分别代表U-Pb年龄、Hf同位素测试激光剥蚀点位;圈中数字为分析点号,编号同表 1,锆石下方年龄为206Pb/238U表面年龄,黄色数字代表εHf(t)

    Figure 3.  Cathodoluminescence (CL) for zircons of syenogranite (sample No.SLG-4) Suolagou area, Elashan magmatic belt

    图 4  鄂拉山岩浆带索拉沟钾长花岗岩(SLG-4)锆石U-Pb年龄谐和图(a)及加权平均值(b)

    Figure 4.  Zircon U-Pb concordia diagram (a) and weighted mean age (b) of syenogranite (sample No.SLG-4) from Suolagou area, Elashan magmatic belt

    图 5  索拉沟钾长花岗岩主量元素判别图解

    鄂拉山地区钾长花岗岩数据来源于虽尔根岗(234 Ma)、格尔木岗(233 Ma)和约尔根(233 Ma)等地出露的岩石[5],东昆仑东段钾长花岗岩数据来源于香日德-巴隆(239~231 Ma)[5]、南戈滩(239 Ma)[35]和哈拉森(239 Ma)[36]地区岩体; a, b底图据文献[38];c.底图据文献[39-41];d.底图据文献[40]

    Figure 5.  Major elements plots for the syenogranite from Suolagou area

    图 6  索拉沟钾长花岗岩岩稀土元素配分图(a)和微量元素蛛网图(b)

    球粒陨石和原始地幔数据来自文献[45], 壳幔混源钾长花岗岩为南戈滩钾长花岗岩(239 Ma)据文献[35], 下地壳来源钾长花岗岩为香日德-巴隆钾长花岗岩(239~231 Ma)据文献[34],鄂拉山、东昆仑东段高分异I型钾长花岗岩数据来源同图 5

    Figure 6.  Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace elements patterns (b) for the syenogranite from Suolagou area, Elashan magmatic belt

    图 7  鄂拉山岩浆带索拉沟钾长花岗岩锆石Hf同位素组成图解

    a底图据文献[19],其中富集岩石圈地幔范围据白日其利辉长岩(251 Ma)[47]和按纳格角闪辉长岩(242 Ma)[48]圈出,古老下地壳部分熔融据香日德钾长花岗岩[19],新生下地壳数据兴海花岗闪长岩(235 Ma)[19]和都兰花岗闪长岩(250 Ma)[49]

    Figure 7.  Hf isotopic compositions of zircons from the Suolagou area, Elashan magmatic belt

    图 8  索拉沟钾长花岗岩成因类型判别图解(b底图据文献[57];数据来源和图例同图 5)

    Figure 8.  Plots of Rb vs.Th (a) and (Al2O3+CaO)/(FeOT+Na2O+K2O) vs.100*(FeOT+MgO+TiO2)/SiO2 (b) for Suolagou syenogranite showing evolution trends of highly fractionated I-type granites

    图 9  索拉沟钾长花岗岩I型与A型判别图解

    a、b底图据文献[56];数据来源和图例同图 5,a中虚线及演化趋势线据文献[55]

    Figure 9.  Discrimination diagram of I-type and A-type for Suolagou syenogranite

    图 10  鄂拉山索拉沟岩浆带钾长花岗岩元素协变关系图

    a底图据文献[60];b, c图中矿区分离结晶趋势线据文献[44];图例及数据来源同图 6;PlAn15.斜长石(An=15); PlAn50.斜长石(An=50);Kfs.钾长石; Bt.黑云母; Ms.白云母; Grt.石榴石; Amp.角闪石; Mgt.磁铁矿; Tit.榍石; Allan.褐帘石; Ap.磷灰石; Sph.榍石; Mon.独居石

    Figure 10.  Plots of Ba-Sr (a), TiO2-Zr (b) and (La/Yb)N-La (c) for Suolagou syenogranite, Elashan magmatic belt

    图 11  鄂拉山岩浆带索拉沟钾长花岗岩Ta*-Nb*图解

    Ta*=(Ta/U)Sample/(Ta/U)PM;Nb*=(Nb/Th)Sample/(Nb/Th)PM;图例及数据来源同图 5,底图据文献[74]; 原始地幔(PM)、洋岛玄武岩(OIB)、洋中脊玄武岩(MORB, N-MORB, E-MORB)数据据文献[74],地壳组分(UCC, LCC, BCC)数据据文献[71]

    Figure 11.  Ta*-Nb* diagrams of Suolagou syenogranite, Elashan magmatic belt

    图 12  鄂拉山岩浆带索拉沟钾长花岗岩构造环境判别图

    R1=1000×[4Si-11(Na+K)-2(Fe+Ti)]; R2=1 000×(6Ca+2Mg+Al); R1R2计算式中元素符号为对应阳离子比; a底图据文献[84]; b底图据文献[85]; c底图据文献[54]; d底图据文献[54]; 数据来源和图例同图 5

    Figure 12.  Tectonic discrimination digrams of Suolagou syenogranite, Elashan magmatic belt

    表  1  鄂拉山岩浆带索拉沟钾长花岗岩锆石LA-ICP-MS U-Pb同位素测试结果

    Table  1.   LA-ICP-MS zircon U-Pb dating results of syenogranite (sample no.SLG-4) from Suolagou area, Elashan magmatic belt

    分析点号 232Th 238U Th/ U 同位素比值 年龄t/Ma
    wB/10-6 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ
    1 308 540 0.57 0.050 6 0.001 7 0.253 0 0.008 3 0.036 2 0.000 3 233 76 229 7 229 2
    2 830 781 1.06 0.059 7 0.003 3 0.306 3 0.016 0 0.037 4 0.000 6 591 120 271 12 237 3
    3 542 934 0.58 0.051 1 0.001 3 0.260 4 0.006 7 0.037 0 0.000 3 243 59 235 5 234 2
    4 633 1 037 0.61 0.051 9 0.001 3 0.265 7 0.007 0 0.037 0 0.000 3 280 53 239 6 234 2
    5 475 842 0.56 0.051 4 0.002 0 0.262 7 0.010 7 0.037 0 0.000 5 257 91 237 9 234 3
    6 234 401 0.58 0.052 1 0.004 0 0.258 6 0.017 5 0.036 6 0.000 8 300 176 234 14 232 5
    7 162 275 0.59 0.051 6 0.002 6 0.258 1 0.012 8 0.036 8 0.000 4 265 123 233 10 233 3
    8 381 874 0.44 0.050 2 0.002 4 0.253 2 0.011 4 0.036 6 0.000 4 206 111 229 9 231 3
    9 1 121 1 700 0.66 0.063 9 0.001 7 0.324 1 0.008 7 0.036 8 0.000 5 739 57 285 7 233 3
    10 430 616 0.70 0.052 0 0.003 0 0.259 8 0.015 1 0.036 2 0.000 4 287 133 235 12 229 3
    11 670 1 720 0.39 0.052 3 0.001 3 0.267 3 0.008 0 0.036 8 0.000 6 298 64 241 6 233 4
    12 312 545 0.57 0.052 3 0.003 6 0.264 9 0.017 9 0.036 6 0.000 6 298 162 239 14 232 4
    13 418 877 0.48 0.051 0 0.001 6 0.264 8 0.008 2 0.037 4 0.000 4 239 72 239 7 237 2
    14 260 326 0.80 0.051 4 0.002 3 0.257 8 0.011 5 0.036 5 0.000 4 257 108 233 9 231 3
    15 260 606 0.43 0.052 8 0.001 8 0.270 8 0.009 3 0.037 0 0.000 4 320 80 243 7 234 2
    16 791 1 999 0.40 0.065 1 0.001 5 0.334 5 0.008 7 0.036 8 0.000 4 776 53 293 7 233 2
    17 575 808 0.71 0.052 5 0.002 1 0.267 6 0.009 6 0.037 4 0.000 6 306 91 241 8 237 4
    下载: 导出CSV

    表  2  鄂拉山岩浆带索拉沟钾长花岗岩主量元素、稀土及微量元素分析结果

    Table  2.   Major and trace element compositions of the syenogranite from Suolagou area, Elashan magmatic belt

    样品编号 SLG-1 SLG-2 SLG-3 SLG-4 SLG-5 SLG-6 SLG-7 SLG-8
    SiO2 wB/% 76.63 76.61 77.05 76.68 77.23 75.94 75.93 75.91
    TiO2 0.06 0.05 0.05 0.05 0.03 0.08 0.08 0.06
    Al2O3 12.26 12.54 12.49 12.60 12.25 12.64 12.84 12.54
    FeOT 0.72 0.85 0.93 0.87 0.84 1.26 1.18 0.94
    MnO 0.04 0.02 0.03 0.03 0.04 0.05 0.04 0.04
    MgO 0.07 0.05 0.07 0.07 0.06 0.15 0.15 0.07
    CaO 0.72 0.65 0.50 0.67 0.57 0.77 0.62 0.75
    Na2O 3.22 3.48 3.52 3.43 3.48 3.69 3.78 3.35
    K2O 4.87 4.78 4.84 4.89 4.62 4.59 4.55 4.84
    P2O5 < 0.01 < 0.01 < 0.01 < 0.01 < 0.01 0.01 0.01 0.01
    烧失量 0.70 0.48 0.40 0.61 0.59 0.60 0.43 0.67
    总量 99.29 99.52 99.88 99.90 99.71 99.78 99.61 99.18
    Mg# 16 10 13 14 12 19 20 13
    A/CNK 1.03 1.04 1.04 1.04 1.04 1.01 1.05 1.03
    DI 95 95 95 95 95 94 94 94
    SI 0.79 0.55 0.76 0.76 0.67 1.57 1.57 0.77
    TZr/℃ 744 736 741 734 733 764 768 750
    Sc wB/10-6 1.0 0.7 1.4 1.3 1.3 1.6 1.6 1.1
    V 2.0 3.0 1.0 2.0 1.0 6.0 4.0 2.0
    Cr 4.0 5.0 4.0 4.0 4.0 6.0 5.0 6.0
    Co 125.0 105.5 115.5 107.0 138.0 170.5 138.5 152.0
    Ni 61.7 54.2 59.2 55.8 69.5 85.0 74.0 82.6
    Mn 197 92 167 140 224 295 257 260
    Cu 10.0 1.1 3.1 2.3 4.7 4.1 6.7 20.8
    Zn 28.0 8.0 16.0 17.0 19.0 26.0 44.0 27.0
    Ga 15.4 18.1 17.4 17.1 16.8 19.7 20.4 16.1
    Cs 5.4 3.9 6.9 4.4 7.3 7.0 8.6 6.7
    Rb 263 268 346 284 342 260 265 299
    Ba 99 54 61 86 49 97 92 93
    Th 45.2 39.5 42.0 35.9 39.0 29.1 30.0 48.4
    U 6.2 6.4 7.4 6.6 6.7 4.4 3.8 7.0
    Nb 12.8 21.0 24.7 18.6 14.0 17.8 20.6 14.4
    Ta 3.1 3.8 5.7 3.9 3.6 3.4 3.7 3.7
    La 27.4 19.2 21.1 18.6 15.9 21.8 21.8 24.7
    Ce 55.6 45.8 46.4 40.7 33.5 51.2 53.0 50.8
    Pb 40.2 19.6 34.3 29.3 35.8 26.4 34.4 39.4
    Pr 5.80 5.22 5.00 4.42 3.72 5.99 6.31 5.54
    Sr 37.1 26.8 20.5 30.3 20.8 41.9 38.1 37.4
    Nd 19.6 19.9 18.6 15.6 12.9 21.7 22.7 17.5
    Zr 91 82 87 81 78 121 122 99
    Hf 3.50 4.00 4.40 4.00 3.70 4.90 5.40 3.80
    Sm 3.53 4.76 4.96 3.70 3.01 4.78 5.41 3.31
    Eu 0.26 0.14 0.15 0.16 0.16 0.17 0.17 0.23
    Ti 390 350 320 350 270 580 550 420
    Gd 2.67 4.01 4.61 3.36 3.02 4.58 4.98 2.86
    Tb 0.40 0.63 0.78 0.56 0.50 0.72 0.78 0.45
    Dy 2.45 3.83 4.93 3.51 3.23 4.22 4.67 2.80
    Y 15.60 22.80 30.40 22.00 19.90 24.00 26.70 17.30
    Ho 0.47 0.78 1.09 0.67 0.64 0.85 0.94 0.58
    Er 1.47 2.44 3.26 2.06 1.98 2.44 2.75 1.71
    Tm 0.26 0.38 0.53 0.35 0.34 0.39 0.44 0.28
    Yb 1.84 2.62 3.73 2.42 2.42 2.46 2.84 2.13
    Lu 0.28 0.39 0.56 0.40 0.39 0.40 0.45 0.34
    ΣREE 122.03 110.10 115.70 96.51 81.71 121.70 127.24 113.23
    δEu 10.68 5.26 4.06 5.51 4.71 6.36 5.51 8.32
    Nb/Ta 5.01 2.60 2.75 3.25 3.41 2.94 2.60 4.82
    Zr/Y 1.20 1.27 1.02 1.15 1.03 1.54 1.45 1.11
    Sm/Nd 0.25 0.10 0.09 0.14 0.16 0.11 0.10 0.22
    Th/U 1.0 0.7 1.4 1.3 1.3 1.6 1.6 1.1
    (La/Yb)N 2.0 3.0 1.0 2.0 1.0 6.0 4.0 2.0
    注:所有样品全岩主微量元素测试于2019年2月在澳实分析检测(广州)有限公司完成;DI为分异指数;SI为固结指数;TZr为据Watson等[46]计算的锆石饱和温度;N代表球粒陨石标准化,球粒陨石数据据文献[45]
    下载: 导出CSV

    表  3  鄂拉山岩浆带索拉沟钾长花岗岩(SLG-4)锆石Hf同位素分析结果

    Table  3.   Hf isotopic data for zircon of Suolagou syenogranite(SLG-4), Elashan magmatic belt

    分析点号 176Yb/ 177Hf 1σ 176Lu/ 177Hf 1σ 176Hf/ 177Hf 1σ 176Hf/ 177Hfi εHf(0) εHf(t) T1DM/ Ga T2DM/ Ga fLu/Hf
    1 0.018 195 0.000 138 0.000 661 0.000 004 0.282 551 0.000 021 0.282 548 -7.83 -2.81 0.98 1.29 -0.98
    2 0.047 809 0.000 746 0.001 637 0.000 018 0.282 573 0.000 020 0.282 566 -7.04 -2.18 0.98 1.25 -0.95
    3 0.022 507 0.000 212 0.000 834 0.000 010 0.282 566 0.000 016 0.282 563 -7.28 -2.29 0.97 1.26 -0.97
    4 0.028 659 0.000 300 0.001 072 0.000 006 0.282 583 0.000 025 0.282 579 -6.67 -1.72 0.95 1.23 -0.97
    5 0.019 430 0.000 400 0.000 723 0.000 017 0.282 576 0.000 019 0.282 573 -6.92 -1.92 0.95 1.24 -0.98
    6 0.036 135 0.000 210 0.001 376 0.000 005 0.282 609 0.000 023 0.282 603 -5.77 -0.86 0.92 1.18 -0.96
    7 0.030 739 0.000 358 0.001 135 0.000 010 0.282 569 0.000 019 0.282 564 -7.17 -2.23 0.97 1.26 -0.97
    8 0.018 329 0.000 515 0.000 688 0.000 016 0.282 556 0.000 027 0.282 553 -7.64 -2.63 0.98 1.28 -0.98
    9 0.076 490 0.003 715 0.002 431 0.000 110 0.282 622 0.000 023 0.282 611 -5.31 -0.56 0.93 1.16 -0.93
    10 0.031 886 0.000 217 0.001 161 0.000 010 0.282 560 0.000 017 0.282 555 -7.50 -2.56 0.98 1.28 -0.97
    11 0.039 268 0.001 174 0.001 458 0.000 053 0.282 538 0.000 027 0.282 532 -8.27 -3.38 1.02 1.32 -0.96
    13 0.027 157 0.000 281 0.001 066 0.000 016 0.282 562 0.000 030 0.282 558 -7.41 -2.46 0.98 1.27 -0.97
    15 0.021 114 0.000 409 0.000 792 0.000 012 0.282 531 0.000 022 0.282 527 -8.53 -3.54 1.01 1.33 -0.98
    16 0.040 041 0.000 585 0.001 445 0.000 027 0.282 563 0.000 022 0.282 557 -7.38 -2.48 0.99 1.27 -0.96
    17 0.042 616 0.001 016 0.001 573 0.000 033 0.282 586 0.000 022 0.282 579 -6.59 -1.72 0.96 1.23 -0.95
    注:15个分析点,分析点号保留U-Pb定点的分析点号,校正计算年龄T=233 Ma;(176Lu/177Hf)CHUR=0.033 2, (176Hf/177Hf)CHUR, 0=0.282 772[50], (176Lu/177Hf)DM=0.038 4[51], (176Hf/177Hf)DM=0.283 25[52], (176Lu/177Hf)CC=0.015, fcc=-0.548, fDM=0.16[51], λ=1.867×10-11yr-1[53]
    下载: 导出CSV
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