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西藏改则地区美苏组岩浆岩锆石U-Pb年龄及地质意义

张耀玲 沈燕绪 吴珍汉 赵珍

张耀玲, 沈燕绪, 吴珍汉, 等, 2018. 西藏改则地区美苏组岩浆岩锆石U-Pb年龄及地质意义. 地质力学学报, 24 (1): 128-136. DOI: 10.12090/j.issn.1006-6616.2018.24.01.014
引用本文: 张耀玲, 沈燕绪, 吴珍汉, 等, 2018. 西藏改则地区美苏组岩浆岩锆石U-Pb年龄及地质意义. 地质力学学报, 24 (1): 128-136. DOI: 10.12090/j.issn.1006-6616.2018.24.01.014
ZHANG Yaoling, SHEN Yanxu, WU Zhenhan, et al., 2018. ZIRCON U-PB AGES OF MAGMATIC ROCKS FROM MEISU FORMATION IN GERZE AREA IN TIBET AND ITS GEOLOGICAL SIGNIFICANCE. Journal of Geomechanics, 24 (1): 128-136. DOI: 10.12090/j.issn.1006-6616.2018.24.01.014
Citation: ZHANG Yaoling, SHEN Yanxu, WU Zhenhan, et al., 2018. ZIRCON U-PB AGES OF MAGMATIC ROCKS FROM MEISU FORMATION IN GERZE AREA IN TIBET AND ITS GEOLOGICAL SIGNIFICANCE. Journal of Geomechanics, 24 (1): 128-136. DOI: 10.12090/j.issn.1006-6616.2018.24.01.014

西藏改则地区美苏组岩浆岩锆石U-Pb年龄及地质意义

doi: 10.12090/j.issn.1006-6616.2018.24.01.014
基金项目: 

中国地质科学院地质力学研究所基本科研业务费项目 DZLXJK201508

中国地质调查局项目 1212011220903

详细信息
    作者简介:

    张耀玲(1984-), 女, 博士研究生, 助理研究员, 从事火山岩与新构造研究。E-mail:yaoling_zhang@126.com

  • 中图分类号: P588.1;P597.3

ZIRCON U-PB AGES OF MAGMATIC ROCKS FROM MEISU FORMATION IN GERZE AREA IN TIBET AND ITS GEOLOGICAL SIGNIFICANCE

  • 摘要: 西藏中部南羌塘改则盆地美苏组由砖红色砂砾岩和火山岩夹层组成,一些学者在美苏组建组剖面等地获得古新世-始新世的K-Ar年龄(34.0~69.1Ma),目前对其形成时代还缺少可靠的年代学约束。应用激光烧蚀多接收器电感耦合等离子体质谱仪(LA-MC-ICP-MS)方法,对改则盆地美苏组沉积地层中的流纹岩、石英粗安岩和花岗斑岩中锆石进行了U-Pb同位素测定。结果表明,改则盆地美苏组红层中的三个火山岩样品及一个侵入岩样品岩浆锆石206Pb/238U年龄分别为38.3±0.5 Ma、39.0±0.3 Ma、37.4±0.4 Ma、38.8±0.6 Ma,从而限定了该地区美苏组沉积时代为始新世晚期。改则地区美苏组岩浆岩形成时代为班公湖-怒江缝合带调节印度-欧亚大陆碰撞之后高原内部刚性块体向东"逃逸"而重新活动提供了年代学证据。

     

  • 图  1  研究区地质简图

    a—青藏高原西南部构造单元划分简图;b—改则地区地质简图JSSZ-金沙江缝合带;BNSZ-班公湖—怒江缝合带;SNMZ-狮泉河—纳木错蛇绿混杂岩带;LMF-洛巴堆—米拉山断裂;IYZSZ-印度—雅鲁藏布缝合带

    Figure  1.  Geological map of the research area

    图  2  美苏组综合地层柱状图

    Figure  2.  General stratigraphic column of Meisu Formation

    图  3  野外露头照片与样品显微图像

    Figure  3.  Outcrop pictures and photomicrographs of dating samples

    图  4  锆石CL图像与部分测点数据

    Figure  4.  Cathodoluminescence(CL)images of zircons and data from samples

    图  5  锆石U-Pb谐和图

    Figure  5.  Isotopic concordance of zircon U-Pb

    表  1  锆石U-Pb同位素测年结果

    Table  1.   Zircon U-Pb isotope dating data

    测点PbUTh/U同位素原子比率表面年龄/Ma
    μg·g-1206Pb/238U207Pb/235U207Pb/206Pb206Pb/238U207Pb/235U207Pb/206Pb
    B13020-1(流纹岩)
    157680.790.00620.00010.04100.00250.04820.0029401412108141
    222140.780.00610.00010.04080.00560.04860.0071391416127344
    311371.180.00620.00010.04310.00940.05040.0135401439214621
    411321.330.00620.00010.04060.00840.04750.010440140873521
    557270.980.00590.00010.03960.00280.04850.0035381393125168
    657510.840.00600.00010.04300.00220.05160.0026391432270114
    711801.570.00620.00020.04060.02400.04780.08044024024883988
    811161.520.00620.00020.12750.01960.14800.0235401122192323272
    911701.060.00580.00010.04230.00840.05320.0114371428339485
    1046211.160.00580.00010.04280.00160.05320.001937143233980
    1146321.420.00600.00010.03980.00310.04830.0037381403114183
    1257500.970.00560.00010.04370.00300.05640.0039361433466153
    1334201.360.00590.00010.04450.00110.05480.001238144140349
    1511270.860.00600.00020.04270.00570.05160.0075391426267334
    1611561.660.00620.00040.03970.01380.04650.02394024014241232
    1734651.220.00620.00020.03990.01880.04700.02464014019471252
    1833641.250.00620.00040.04140.02020.04850.032840241201241590
    1911061.480.00600.00050.04030.01330.04830.031839340131131552
    2011601.110.00690.00030.13010.01420.13690.0245442124142188311
    2122180.860.00630.00030.04030.01570.04650.04314024016252220
    2234431.130.00600.00020.10200.00940.12370.01263819992010181
    2344270.750.00810.00020.21230.00760.18940.00675211957273759
    2433430.890.00790.00020.14140.01150.12950.0101512134112091138
    2511761.180.00620.00030.04140.01160.04860.142740241121286912
    B13021-1(流纹岩)
    122680.690.00620.00010.03940.00380.04640.004640139421240
    212020.920.00600.00010.04060.00430.04910.0052381404155249
    30621.180.00610.00020.04370.00700.05230.0090391437296392
    421971.040.00620.00010.04130.00440.04810.0052401414106254
    522900.600.00610.00010.04220.00310.05010.0037391423198173
    622190.810.00620.00010.04120.00580.04850.0068401416123331
    711060.780.00600.00010.04050.00960.04900.01203914010146575
    822870.730.00600.00010.04200.00350.05040.0040391423213185
    934570.840.00610.00010.04250.00220.05080.0026391422230117
    1011940.980.00640.00010.04230.00220.04780.002441142287119
    111941.440.00600.00010.04260.00850.05190.0117381428282515
    1222491.540.00620.00010.04290.00360.05060.0042401434223191
    1311281.230.00610.00010.03770.00430.04500.005439138455292
    1434750.990.00590.00010.03970.00210.04860.0025381402128120
    1523181.110.00600.00010.04340.00380.05260.0047381434313201
    1631931.040.00960.00010.41510.01380.31450.010161135312354349
    1745670.920.00620.00010.04320.00290.05070.0034401433227157
    1857341.550.00610.00010.04440.00320.05320.0038391443336163
    1922961.150.00610.00010.04190.00220.05020.0026391422203120
    2034090.680.00600.00010.03900.00330.04720.003839139360190
    2134150.680.00600.00010.04320.00300.05260.0036381433310155
    2211780.890.00600.00020.04190.00990.05050.01233914210219562
    2334520.860.00600.00010.04170.00320.05070.0039381423229177
    2445211.020.00590.00010.04170.00380.05100.0045381424243205
    25255480.770.01880.00031.49240.03320.57460.0074120292721444519
    2634570.830.00610.00010.04160.00350.04930.0042391414164198
    B13023-1(石英粗安岩)
    135150.700.00600.00010.04890.00360.05890.0043390484563158
    243670.880.00780.00010.24280.01270.22540.009150122112302065
    344781.040.00630.00010.09810.00630.11350.00664019561856104
    433940.810.00600.00010.06560.00570.07950.00683806461185169
    543610.860.00700.00010.17740.00770.18340.00694511667268462
    633080.880.00720.00010.20550.01180.20780.009746119011288876
    733700.750.00640.00010.10710.00620.12220.00664101036198996
    822060.750.00730.00010.20060.01490.20050.0132471186142830107
    923320.810.00610.00010.04980.00750.05900.0091390497568336
    1033800.720.00670.00010.13080.00920.14110.008443112592241103
    1144020.790.00730.00010.19850.01130.19620.008747118410279573
    1254710.950.00730.00010.19180.00850.19140.00714711788275461
    1334010.930.00620.00010.07650.00570.08890.00654017561403140
    1433900.990.00660.00010.11990.00650.13200.00644211156212585
    1534790.950.00590.00010.03990.00350.04870.0042380403134204
    1623641.000.00600.00010.04030.00480.04890.0060380405144288
    1733541.380.00590.00010.07540.00610.09310.00753807461490152
    1823611.190.00560.00010.05690.00520.07310.00673605651016185
    1945221.170.00590.00010.06230.00410.07650.00483806141108126
    2022671.120.00590.00010.03870.00660.04750.008638039773429
    2133791.130.00590.00010.05360.00530.06590.0065380535803205
    2267601.180.00590.00010.05510.00260.06770.003238054386099
    2323480.990.00580.00010.04220.00500.05310.0064370425331275
    2445861.120.00580.00010.04420.00350.05490.0043380443409175
    B13022-1(花岗斑岩)
    111211.290.00730.00020.10970.00930.11520.04614721062618832025
    211061.260.00720.00020.12140.00700.11800.0084461116201927336
    311111.110.00600.00020.04170.01140.05000.026139141111961213
    422580.850.00590.00010.04310.00520.05300.0068381435328293
    51811.060.00700.00020.10250.00720.10010.009145199181626388
    611211.470.00660.00010.06840.00670.07560.008542167121083392
    722241.120.00620.00010.04160.00800.04830.0093401418112455
    82691.710.01260.00030.76520.03080.43950.015681257723405053
    911801.610.00630.00010.04330.00610.04980.0075411436185351
    101921.300.00590.00020.03880.01860.04790.02803813918921387
    1111261.460.00590.00010.03840.01180.04710.0172381381255870
    1211941.510.00580.00010.04070.00840.05050.0111381418218511
    1311421.120.00590.00020.04030.01260.04960.01663814013175779
    1411041.320.00600.00010.04170.00840.05060.0117381428221535
    151681.350.00620.00030.04400.03120.05160.034140244132661518
    161116361.340.00580.00010.04040.00850.05050.0110371408219502
    1755621.270.00670.00020.04320.00630.04660.009343143631479
    181116181.150.00590.00010.04270.00730.05250.0095381427306414
    191013961.350.00630.00010.03940.01300.04700.0146401391351765
    2068541.350.00590.00010.03860.01030.04720.0145381381062731
    21811881.130.00610.00010.04260.00740.05040.0092391427212423
    2246820.840.00620.00020.04150.01430.04830.01644014114115799
    2378011.290.00640.00010.04200.00950.04740.015141142969758
    2474161.070.00950.00040.47270.03930.36000.0316612393333750133
    25912060.860.00600.00010.04060.01010.04880.01403914010140675
    2644570.980.00640.00030.05660.02500.06380.3683412563673617345
    下载: 导出CSV
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出版历程
  • 收稿日期:  2017-08-01
  • 修回日期:  2017-12-01
  • 刊出日期:  2018-02-28

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