四川攀枝花大田地区混合岩LA-ICP-MS锆石U-Pb测年及其地质意义

姚建, 李巨初, 周君, 陈志国, 姚海平. 四川攀枝花大田地区混合岩LA-ICP-MS锆石U-Pb测年及其地质意义[J]. 地质通报, 2017, 36(2-3): 381-391.
引用本文: 姚建, 李巨初, 周君, 陈志国, 姚海平. 四川攀枝花大田地区混合岩LA-ICP-MS锆石U-Pb测年及其地质意义[J]. 地质通报, 2017, 36(2-3): 381-391.
YAO Jian, LI Juchu, ZHOU Jun, CHEN Zhiguo, YAO Haiping. LA-ICP-MS zircon U-Pb dating of migmatite in Datian, Panzhihua City, and its geological significance[J]. Geological Bulletin of China, 2017, 36(2-3): 381-391.
Citation: YAO Jian, LI Juchu, ZHOU Jun, CHEN Zhiguo, YAO Haiping. LA-ICP-MS zircon U-Pb dating of migmatite in Datian, Panzhihua City, and its geological significance[J]. Geological Bulletin of China, 2017, 36(2-3): 381-391.

四川攀枝花大田地区混合岩LA-ICP-MS锆石U-Pb测年及其地质意义

  • 基金项目:
    中国核工业地质矿产事业部生产项目《四川西部地区铀矿资源调查评价与勘查》(编号:201638)
详细信息
    作者简介: 姚建 (1986-), 男, 在读硕士生, 工程师, 从事铀矿勘查工作。E-mail:yaojian280@163.com
  • 中图分类号: P597+.3

LA-ICP-MS zircon U-Pb dating of migmatite in Datian, Panzhihua City, and its geological significance

  • 广泛分布于扬子地台西缘康滇地轴上的康定杂岩,其形成时代一直争议较大。选取前人少有涉及的大田地区混合岩进行LA-ICP-MS锆石U-Pb年龄测定,结果表明,其年龄时限集中在744~772Ma之间,为晋宁造山运动期产物,与近年其他学者针对康定杂岩的锆石测年结果一致,说明康滇地轴最大一次混合岩化作用发生在晋宁期。混合岩稀土元素具2种明显不同的配分型式,显示深熔作用特征。深熔作用早期混合岩Eu具正异常特征,晚期则具明显的负Eu异常,显示有分异结晶作用。有利的铀矿赋矿围岩为深熔作用晚期分异结晶形成的混合岩

  • 加载中
  • 图 1  攀枝花大田地区地质与样品分布略图

    Figure 1. 

    图 2  大田地区岩石样品图

    Figure 2. 

    图 3  大田地区混合岩锆石阴极发光 (CL) 图像

    Figure 3. 

    图 4  黑云斜长混合岩 (DY-1) 锆石U-Pb谐和图

    Figure 4. 

    图 5  黑云斜长混合岩(DY-16)锆石U-Pb谐和图

    Figure 5. 

    图 6  角闪斜长混合岩(DY-19)锆石U-Pb谐和图

    Figure 6. 

    图 7  石英闪长岩(DY-20)锆石U-Pb谐和图

    Figure 7. 

    图 8  混合岩稀土元素球粒陨石标准化配分图

    Figure 8. 

    表 1  黑云斜长混合岩 (DY-1) LA-ICP-MS锆石U-Th-Pb定年结果

    Table 1.  LA-ICP-MS zircon U-Th-Pb isotope data for biotite plagioclase migmatite samples

    测试号含量/10-6同位素比值年龄/Ma
    PbU232Th/238U206Pb/238U±1σ207Pb/235U±1σ207Pb/206Pb±1σ206Pb/238U±1σ207Pb/235U±1σ207Pb/206Pb±1σ
    黑云斜长混合岩DY-1
    DY-1.11097410.6620.12730.00081.15910.01320.06610.00087725782980825
    DY-1.222014430.4860.13860.00081.29320.01240.06770.00078375843885922
    DY-1.326916470.0370.13280.00091.26010.01930.06880.001180458281389333
    DY-1.416011060.5800.12720.00071.20560.01060.06870.00077725803789020
    DY-1.529818131.1150.12780.00081.17430.00840.06670.00067755789682718
    DY-1.615110690.5210.12780.00081.20490.01980.06840.001177558031388034
    DY-1.733922540.7150.12810.00081.20290.00850.06810.00057775802687116
    DY-1.835926960.3330.12820.00081.15570.02650.06540.001577857801878647
    DY-1.923815090.7050.12730.00081.15840.03430.06600.001977257812380660
    DY-1.101197450.3320.15210.00121.46330.01260.06980.00059137915892115
    DY-1.1127317810.1590.15510.00101.51040.00750.07060.00059296935594714
    DY-1.1230120750.5700.12920.00081.16760.01380.06550.00087835785979227
    DY-1.1333426530.0960.12580.00081.13400.00820.06540.00057645770678716
    DY-1.1449730650.7380.12890.00081.20350.02830.06770.001678158021986049
    DY-1.1545329450.4620.13060.00091.21840.03240.06770.001879158092285856
    DY-1.1622814840.7030.12660.00081.17630.03180.06740.001876957902184955
    DY-1.171117250.5730.12650.00081.15340.02510.06610.001576857791781046
    DY-1.1818112520.4090.12640.00081.17650.02910.06750.001676757902085351
    DY-1.1919412730.5720.13680.00081.29000.01100.06840.00068265841788119
    DY-1.2023813790.7540.14460.00101.41040.02050.07070.001087168931395030
    DY-1.2129016080.0830.15790.00131.64780.01940.07570.0008945798912108720
    DY-1.2450329980.5430.13430.00111.17750.04650.06360.002581267903172884
    黑云斜长混合岩DY-16
    DY-16.1392890.1140.13770.00081.27760.01130.06730.00068325836784617
    DY-16.25370.7090.12740.00081.16140.03920.06610.002277357832681171
    DY-16.33210.6180.12710.00101.14190.07300.06520.0042771677349780134
    DY-16.412611.2050.14510.00101.36440.02260.06820.001187468741487435
    DY-16.511660.4700.14750.00091.40890.01790.06930.000988758931190727
    DY-16.615930.1360.16120.00101.59150.01570.07160.000896469671097522
    DY-16.86400.4910.14030.00101.31510.03320.06800.001784668522186852
    DY-16.9160.2430.13700.00281.26540.25070.06700.014582817830165837450
    DY-16.106420.6500.12740.00081.15200.03630.06560.002177357782479366
    DY-16.116400.5930.12730.00081.21060.03690.06900.002177258052589863
    DY-16.12201500.2450.13310.00081.21920.01110.06640.00068065809782020
    DY-16.135281.4400.13200.00091.20520.06040.06620.0033799680340813105
    DY-16.142170.3720.14140.00101.31970.08100.06770.0041853685452858127
    DY-16.155340.4870.12540.00081.13010.03090.06530.001876257682178657
    DY-16.165350.4300.13270.00091.20960.04590.06610.002580358053180979
    DY-16.175310.6390.13290.00091.21380.04350.06620.002480458072981475
    DY-16.183220.4780.12690.00101.14240.06800.06530.0039770677446784124
    DY-16.1911780.1960.14130.00101.35260.02800.06940.001585268691891244
    DY-16.205310.6510.13110.00081.19840.04260.06630.002379458002881674
    DY-16.21392400.1590.16320.00101.64070.01580.07290.0007974698610101220
    DY-16.228470.3500.14500.00091.37630.02390.06880.001287368791589435
    DY-16.23432690.1130.15830.00101.55010.02130.07100.000994769511395826
    DY-16.24603460.0770.15900.00141.56120.05670.07120.002195189553596461
    角闪斜长混合岩DY-19
    DY-19.14250.5190.12570.00081.12790.03410.06510.001976357672377762
    DY-19.212390.5000.17220.00141.74400.02300.07350.000710248102514102720
    DY-19.38600.5700.12210.00071.08960.02030.06470.001274357481476540
    DY-19.4191370.6600.12370.00071.11320.01070.06530.00077524760778322
    DY-19.58600.6000.12200.00071.09420.02110.06500.001374257511477642
    DY-19.67520.5970.12210.00081.08240.02770.06430.001674357451975153
    DY-19.710660.9120.12220.00071.09480.02080.06500.001374347511477441
    DY-19.811870.3720.12580.00071.12250.01480.06470.000976457641076529
    DY-19.9725100.4410.13390.00091.28640.00810.06970.00058105840591914
    DY-19.106440.7040.12250.00081.10150.03090.06520.001874557542178159
    DY-19.117510.7860.12270.00081.09680.02800.06480.001774657521976954
    DY-19.127490.9440.12220.00071.08510.02050.06440.001374357461475441
    DY-19.1312890.6600.12300.00071.09580.01370.06460.00097484751976128
    DY-19.146450.7290.12190.00071.23300.03000.07340.0018741481620102550
    DY-19.154250.4470.12710.00081.15520.03590.06590.002077157802480462
    DY-19.1612860.5720.12510.00071.13180.01690.06560.001076057691179433
    DY-19.177420.8900.12850.00081.16850.02990.06600.001777957862080553
    DY-19.184260.7080.13050.00091.18170.03350.06570.001879167922279758
    DY-19.205350.8640.12610.00081.17150.03140.06740.001876657872184956
    DY-19.214280.6430.12660.00081.17150.03560.06710.002076957872484163
    DY-19.2212760.7480.13060.00081.24090.01780.06890.001079158191289630
    DY-19.235300.6680.12840.00091.16680.04030.06590.002277957852780371
    DY-19.246380.6550.13050.00081.20630.04240.06710.002379058042884073
    石英闪长岩DY-20
    DY-20.17470.7510.12330.00081.22130.01040.07180.00057495810798215
    DY-20.2110.9540.12330.00081.09800.00990.06460.00047505752776014
    DY-20.3201410.6060.12320.00081.09360.00880.06440.00057495750675415
    DY-20.47460.6140.12300.00081.26430.01100.07450.001074858307105628
    DY-20.510770.2560.12320.00081.24760.00930.07340.000774958226102618
    DY-20.610630.8650.12720.00081.19270.01280.06800.00077725797986920
    DY-20.78520.6240.12880.00081.24710.02980.07020.000578158222093514
    DY-20.84300.5870.12680.00081.15380.01100.06600.00057705779780617
    DY-20.96380.8880.12890.00091.16740.01350.06570.00047825785979713
    DY-20.108490.6750.13040.00091.20910.01020.06720.00047905805784514
    DY-20.116370.5610.12730.00081.15360.00980.06570.00047725779779814
    DY-20.1214920.6700.13610.00081.28150.00980.06830.00048235838687713
    DY-20.134240.5740.13020.00081.22660.01200.06830.00117895813887934
    DY-20.144280.7450.13180.00091.24700.01140.06860.00077985822788721
    DY-20.154240.6410.13740.00081.31620.02620.06950.000683058531791217
    DY-20.162120.4830.12930.00091.17390.02230.06590.000478457881580213
    DY-20.174220.7380.13310.00091.24880.01700.06810.002380558231187070
    DY-20.18140.5700.13330.00091.29720.01420.07060.00078066844994620
    DY-20.198540.6270.13020.00131.25010.01300.06970.00047898823991813
    DY-20.209640.3980.13150.00091.27040.01020.07010.00057975833793015
    DY-20.214270.3170.12980.00081.21490.01030.06790.00057865807786616
    DY-20.224250.5810.13110.00091.19750.00970.06620.00087945799681427
    DY-20.236410.4460.13930.00081.30110.01690.06770.000684158461186119
    DY-20.249660.0630.13670.00081.27160.00940.06740.00058265833685116
    DY-20.251100.5670.12420.00071.10920.01170.06480.00067555758876721
    下载: 导出CSV

    表 2  混合岩稀土元素分析结果

    Table 2.  REE compositions of migmatite

    10-6
    样品编号ZY-13ZY-17ZY-33ZY-49ZY-50ZY-51W-1W-2W-8W-12
    La28.1037.3028.6030.9015.3023.0031.3023.40143.0031.40
    Ce48.2067.3054.2057.1024.1039.8079.9056.50264.0063.90
    Pr4.886.975.865.902.193.9610.507.0327.907.87
    Nd17.2024.1021.2022.306.7912.6045.6028.60104.0032.00
    Sm2.372.963.693.560.851.6610.505.6117.505.90
    Eu1.641.711.651.540.730.851.100.341.361.18
    Gd2.372.323.812.950.891.469.865.8416.006.26
    Tb0.300.280.480.420.170.221.901.062.421.08
    Dy1.511.382.521.830.921.3410.906.2212.906.57
    Ho0.290.210.440.390.130.231.991.141.951.25
    Er0.830.641.301.090.340.686.323.474.713.67
    Tm0.130.110.170.150.070.111.010.620.710.56
    Yb0.820.750.900.960.400.826.184.133.393.40
    Lu0.110.120.130.150.050.100.730.620.410.45
    Y8.086.1811.409.673.656.4560.0037.6056.6036.20
    ∑REE108.76146.15124.95129.2552.9186.83217.79144.58600.25165.49
    LREE102.39140.34115.20121.3049.9681.87178.90121.48557.76142.25
    HREE6.375.819.757.952.954.9638.8923.1042.4923.24
    LREE/HREE16.0924.1411.8215.2716.9416.504.605.2613.136.12
    (La/Yb)N24.6135.7222.7722.9927.5720.073.634.0630.266.62
    δEu2.121.991.351.452.571.670.330.180.250.59
    δCe1.011.021.031.041.021.021.081.081.021.00
    样品编号W-13W-15W-16W-17W-18Y18-1DT-Y21XT-1XT-2XT-3
    La30.20266.00277.00193.00108.0027.1035.0045.6030.9028.40
    Ce68.00504.00547.00399.00213.0061.3091.80104.0082.6074.70
    Pr8.7456.1063.2046.7024.308.2812.6013.7012.2010.80
    Nd34.60214.00241.00181.0090.6038.3057.3054.6056.1047.20
    Sm7.8431.3043.9032.9014.1010.9013.6012.8016.4013.10
    Eu0.941.501.862.441.721.281.281.740.820.98
    Gd7.9822.9034.7024.5011.908.9912.009.9012.009.40
    Tb1.502.655.373.371.682.213.682.343.262.64
    Dy8.9711.1029.4015.209.8115.2023.4015.0020.0016.60
    Ho1.501.554.961.981.892.985.203.264.283.54
    Er3.734.0014.004.656.957.2214.308.9611.609.29
    Tm0.510.451.810.531.080.882.001.361.641.32
    Yb2.562.2710.602.557.854.9912.908.329.447.50
    Lu0.350.311.330.291.200.611.701.201.281.04
    Y37.0041.80124.0058.0052.1065.40128.0082.80101.0078.20
    ∑REE177.421118.131276.13908.10494.08190.24286.76282.78262.52226.51
    LREE150.321072.901173.96855.04451.72147.16211.58232.44199.02175.18
    HREE27.1045.23102.1753.0642.3643.0875.1850.3463.5051.33
    LREE/HREE5.5523.7211.4916.1110.663.422.814.623.133.41
    (La/Yb)N8.4684.0518.7454.299.873.901.953.932.352.72
    δEu0.360.170.150.260.410.380.300.460.170.26
    δCe1.031.011.011.031.020.991.071.011.041.05
     注:测试单位为核工业北京地质研究院分析测试研究中心
    下载: 导出CSV
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出版历程
收稿日期:  2016-08-04
修回日期:  2016-09-26
刊出日期:  2017-03-25

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