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台湾东部未变形花岗岩LA-ICP-MS锆石U-Pb定年及其地质意义

黄长煌

黄长煌. 2017: 台湾东部未变形花岗岩LA-ICP-MS锆石U-Pb定年及其地质意义. 地质通报, 36(10): 1740-1749.
引用本文: 黄长煌. 2017: 台湾东部未变形花岗岩LA-ICP-MS锆石U-Pb定年及其地质意义. 地质通报, 36(10): 1740-1749.
HUANG Changhuang. 2017: LA-ICP-MS zircon U-Pb dating of the undeformed granite in eastern Taiwan and its geological significance. Geological Bulletin of China, 36(10): 1740-1749.
Citation: HUANG Changhuang. 2017: LA-ICP-MS zircon U-Pb dating of the undeformed granite in eastern Taiwan and its geological significance. Geological Bulletin of China, 36(10): 1740-1749.

台湾东部未变形花岗岩LA-ICP-MS锆石U-Pb定年及其地质意义

基金项目: 

中国地质调查局项目《闽台中生代构造岩浆区区域地质专项调查》 12120114043301

详细信息
    作者简介:

    黄长煌(1962-), 男, 本科, 高级工程师, 从事区域地质调查及矿产调查等工作。E-mail:1154423711@qq.com

  • 中图分类号: P588.12+1;P597+.3

LA-ICP-MS zircon U-Pb dating of the undeformed granite in eastern Taiwan and its geological significance

  • 摘要:

    台湾源头山位于台湾岛东部太鲁阁带的北部,主体为花岗闪长岩-辉长岩"浆混岩"组合,发生了强烈变形变质,其中央分布有未变形的侵入体,具有典型岩浆岩特征,代表了变形变质期后的岩浆事件。通过开展野外地质调查和岩石学、同位素年代学研究,揭示了变形变质作用前后侵入岩在岩石特征及主量、微量元素方面存在明显差别,表明二者是不同构造岩浆事件的产物。未变形的侵入岩为石英闪长岩,具有高Pb、Rb、U、Th、Zr轻度富集特征,属典型的I型花岗岩,其LA-ICPMS锆石U-Pb年龄为82±1Ma,属晚白垩世坎潘期。这是台湾东部地区变形变质事件结束的标志,其后台湾东部进入了一个非挤压的新构造作用阶段。

    Abstract:

    Yuantoushan is located in the north of Tailuko belt, eastern Taiwan. It is mainly composed of strongly deformed and metamorphosed granodiorite-gabbro "slurry mixed rock" combination. Deformed intrusions are in the center and show typical magmatic features, representing magmatic events after deformation and metamorphism. The authors carried out field geological survey and petrologic as well as isotopic geochronologic studies of metamorphic intrusive rocks and intrusive rocks. It is shown that there are significant differences in rock characteristics and main trace elements between the two kinds of rocks, indicating that the two kinds of rocks are products of different tectonic magmatic events. Undeformed intrusive rock is quartz diorite, with high Pb, Rb, U, Th, Zr, exhibiting mild enrichment characteristics of I type granite, and its LA-ICP-MS zircon U-Pb isotopic age is 82 ±1Ma, suggesting the Late Cretaceous Campanian period. This indicates that the deformation and metamorphism event in eastern Taiwan were ended, and the evolution then entered a non-squeezing neotectonic stage.

  • 致谢: 本文在调研工作中得到福建省地质调查研究院陈润生教授级高级工程师的帮助;台湾大学陈正宏、李寄瑀教授,台湾东华大学刘萤三教授,台湾师范大学叶恩肇教授等参加了野外考察及调查工作,审稿专家对论文提出了宝贵修改意见,在此表示衷心感谢。
  • 图  1   台湾东部地区地质略图(据参考文献[1]修改)

    1-前古近纪(南澳片岩),变粒岩、云母片岩、绿泥石片岩、绿泥钠长片岩等;2-晚白垩世角闪片岩(枫树山岩体);3-源头山岩体(未变形石英闪长岩);4-源头山岩体(片麻状花岗闪长岩);5-绿泥片岩;6-黑云片岩和二云片岩;7-角闪片岩;8-片麻状花岗闪长岩;9-石英闪长岩;10-糜棱岩化;11-取样点

    Figure  1.   Geological map of eastern Taiwan

    图版Ⅰ  

    a、d.块状石英闪长岩;b、e.片麻状花岗闪长岩与辉长岩(浆混杂岩);c、f.角闪片岩(f有花岗闪长岩脉侵入)。 a、b为正交偏光,c为单偏光,均为×40。Q-石英;Pl-斜长石;Hb-角闪岩;Bi-黑云母;Mu-白云母

    图版Ⅰ.  

    图  2   TAS(a)和硅-钾(b)图解

    Ph-响岩;Pc-苦橄玄武岩;B-玄武岩;O1-玄武安山岩;O2-安山岩;O3-英安岩;R-流纹岩;F-副长石岩(ol<10%, 碧玄岩;ol>10%, 碱玄岩);S1-粗面玄武岩;S2-玄武粗安岩;S3-粗安岩;T-粗面岩(Q<20%);粗面英安岩(Q>20%);U1-响岩质碱玄岩;U2-碱玄质响岩;U3-响岩。Ir线上方为碱性岩石系列,下方为亚碱性岩石系列

    Figure  2.   TAS classification (a) and SiO2-K2O (b) diagrams

    图  3   全岩微量元素蛛网图(a)及稀土元素配分模式(b)[12-13]

    Figure  3.   Trace elements spidergrams (a) and chondrite-normalized REE patterns (b) for granites(δοK2)

    图  5   源头山岩体锆石U-Pb谐和图和206Pb/238U表面年龄加权平均值

    Figure  5.   U-Pb concordia diagram of zircons from Yuantoushan granites(δοK2)

    图  4   源头山岩体(δοK2)锆石CL图像

    Figure  4.   CL images of zircons from Yuantoushan granites(δοK2)

    表  1   样品位置及岩性

    Table  1   Locations and lithology of chemically and chronologically analyzed samples

    样号 东经 北纬 岩石名称 采样地点
    D0015 121°45′30″ 24°30′29″ 块状石英闪长岩 南澳北溪
    D0017 121°46′09″ 24°30′12″ 片麻状糜棱岩化花岗闪长岩 南澳北溪
    D0011-1 121°53′08″ 24°30′10″ 角闪片岩(枫树山岩体) 南澳
    D0013-1 121°53′08″ 24°30′36″ 微晶角闪片岩(枫树山岩体) 南澳
    下载: 导出CSV

    表  2   花岗岩主量、微量和稀土元素分析数据

    Table  2   Major, trace and rare earth elements of granites

    岩体 枫树山 源头山岩体 岩体 枫树山 源头山岩体
    岩性 角闪片岩 微晶闪长岩(未变形) 细粒石英闪长岩(未变形) 片麻状花岗闪长岩 岩性 角闪片岩 微晶闪长岩(未变形) 细粒石英闪长岩(未变形) 片麻状花岗闪长岩
    样号 D0011 D0013-1 D0015 2806 NA6A NA8 D0017 样号 D0011 D0013-1 D0015 2806 NA6A NA8 D0017
    SiO2 48.68 54.7 56.7 58.25 65.52 64.88 63.25 Nd 7.15 10.96 23.41 24.5 34.7 34.8 37.28
    TiO2 0.98 1.09 1.71 1.69 0.7 0.7 0.9 Sm 2.55 3.12 5 5.29 5.98 6.34 7.59
    Al2O3 15.44 15.43 16.99 16.76 16.64 17.18 17.05 Eu 0.94 1.11 1.35 1.48 1.18 1.26 1.52
    FeO 6.24 6.38 5.44 6.16 3.66 2.74 2.92 Gd 3.12 3.66 4.05 5.44 4.6 6.88 6.38
    Fe2O3 2.1 3.45 1.66 1.06 1.1 1.03 1.86 Tb 0.6 0.64 0.64 0.84 0.83 0.63 1.05
    MnO 0.079 0.11 0.124 0.15 0.11 0.03 0.137 Dy 3.24 3.44 3.04 4.95
    MgO 9.32 4.13 4.04 2.16 1.89 1.89 1.92 Ho 0.76 0.84 0.7 1.12
    CaO 11.46 7.43 5.8 5.37 2.28 1.1 2.37 Er 2.26 2.37 2.02 3.13
    Na2O 2.27 2.18 3.11 3.26 2.78 2.52 3.49 Tm 0.32 0.33 0.3 0.44
    K2O 0.17 1.02 1.62 2.1 2.7 4.31 3.53 Yb 2.25 2.28 1.96 2.94 4.2 1.18 2.95
    P2O5 0.08 0.11 0.12 0.5 0.09 0.05 0.14 Lu 0.3 0.31 0.27 0.45 0.72 0.13 0.39
    总和 99.59 99.62 99.64 99.66 Y 23.1 24.6 20.5 18 29 15 30.9
    Co 48.28 32.14 25.65 17 10 5 11.32 AR 1.20 1.33 1.52 1.64 1.82 2.19 2.13
    Ni 172.4 15.39 15.51 7 22 9 18.12 SI 46.4 24.1 25.5 14.7 15.6 15.1 14.0
    Zn 68.93 100.9 91.09 116 141 97 89.12 FL 17.6 30.1 44.9 50.0 70.6 86.1 74.8
    Rb 5.6 60.18 65.87 89 114 155 153.6 A/CNK 0.62 0.85 0.98 0.96 1.43 1.59 1.23
    Sr 126 222 306.8 337 252 192 237.6 σ 1.05 0.88 1.63 1.88 1.33 2.13 2.43
    Nb 2.23 4.17 9.07 18 15 18 15.31 Na2O+K2O 2.44 3.20 4.73 5.36 5.48 6.83 7.02
    Cd 0.243 0.234 0.202 0.161 K2O/Na2O 0.07 0.47 0.52 0.64 0.97 1.71 1.01
    Ba 34.03 129.2 303.2 396 546 949 616.5 DI 53.35 71.12 77.21 80.29 86.97 88.88 87.59
    Hf 2.92 3.03 5.6 4.02 7.01 9.8 7.76 LREE/HREE 1.66 2.11 4.13 3.89 5.04 8.46 4.54
    W 0.48 0.73 1.64 1.2 ΣREE 23.88 42.70 104.63 79.97 158.96 177.63 181.49
    Pb 10.03 12.46 14.13 16 35 17 21.22 δEu 1.02 1.00 0.89 0.84 0.66 0.58 0.65
    Th 1.04 1.98 7.86 6.9 15 19 17.74 Rb/Sr 0.04 0.27 0.21 0.26 0.45 0.81 0.65
    U 0.09 0.45 1.03 2.1 3.7 2.8 3.38 Th/U 11.56 4.40 7.63 3.29 4.05 6.79 5.25
    Cr 366.5 38.9 36.6 17 56 52 47.7 Ba/Sr 0.27 0.58 0.99 1.18 2.17 4.94 2.59
    V 197.4 261 138.4 56 89 86 73.5 Q_CIPW 0.00 15.12 11.95 14.70 30.12 28.30 21.23
    Zr 62.7 85.6 130.6 112 249 346 217.2 C_CIPW 0.00 0.00 0.00 0.57 5.35 6.73 3.60
    La 3.26 7.66 22.62 20.6 37.4 44.33 42.27 Or_CIPW 1.04 6.28 9.84 12.74 16.37 26.42 21.38
    Ce 8.58 17.48 46.61 28.1 79.7 90.9 83.15 Ab_CIPW 19.84 19.21 27.04 28.30 24.13 22.11 30.27
    Pr 1.4 2.37 5.64 9.68 An_CIPW 32.47 30.52 28.37 23.98 11.00 5.32 11.12
    注:主量元素含量单位为%,微量和稀土元素含量为10-6
    下载: 导出CSV

    表  3   锆石U-Th-Pb同位素分析数据和计算的年龄值

    Table  3   Analytical data of zircon U-Th-Pb isotopes and calculated age values

    测点号 总Pb/10-6 232Th/10-6 238U/10-6 Th/U 同位素比值 表面年龄/Ma
    207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U 206Pb/238U
    D0015-1 6 259 319 0.81 0.0489 0.0026 0.0878 0.0047 0.0130 0.0002 142.7 124.1 85.4 4.4 83.2 1.3
    2 4 160 222 0.72 0.0527 0.0034 0.0918 0.0057 0.0129 0.0003 322.3 146.3 89.1 5.3 82.7 1.7
    3 13 435 753 0.58 0.0482 0.0019 0.0831 0.0031 0.0124 0.0002 109.4 90.7 81.0 2.9 79.8 1.1
    4 5 201 343 0.59 0.0449 0.0023 0.0776 0.0041 0.0126 0.0002 75.9 3.8 80.6 1.6
    5 8 334 490 0.68 0.0487 0.0021 0.0824 0.0037 0.0124 0.0003 131.6 101.8 80.4 3.4 79.3 1.8
    6 8 354 436 0.81 0.0490 0.0019 0.0860 0.0034 0.0126 0.0002 150.1 88.9 83.8 3.2 80.9 1.2
    7 4 122 220 0.56 0.0419 0.0034 0.0758 0.0058 0.0132 0.0003 error error 74.2 5.5 84.6 1.8
    8 6 241 336 0.72 0.0477 0.0031 0.0841 0.0052 0.0129 0.0002 87.1 148.1 82.0 4.9 82.9 1.5
    9 8 377 459 0.82 0.0483 0.0021 0.0855 0.0036 0.0129 0.0002 122.3 -93.5 83.3 3.4 82.7 1.3
    10 6 171 334 0.51 0.0449 0.0024 0.0802 0.0040 0.0132 0.0002 error 78.4 3.8 84.8 1.5
    11 5 229 298 0.77 0.0476 0.0023 0.0842 0.0040 0.0129 0.0002 76.0 114.8 82.1 3.8 82.5 1.5
    12 4 149 220 0.68 0.0498 0.0028 0.0891 0.0047 0.0131 0.0002 183.4 126.8 86.7 4.4 84.1 1.5
    13 6 142 349 0.41 0.0483 0.0032 0.0822 0.0052 0.0125 0.0002 122.3 142.6 80.2 4.9 79.8 1.5
    14 7 293 391 0.75 0.0527 0.0028 0.0899 0.0045 0.0125 0.0002 322.3 122.2 87.4 4.2 79.8 1.3
    15 9 404 549 0.74 0.0485 0.0026 0.0805 0.0041 0.0122 0.0003 124.2 131.5 78.6 3.8 77.9 2.1
    16 5 178 280 0.64 0.0476 0.0031 0.0802 0.0052 0.0122 0.0002 76.0 157.4 78.3 4.9 78.0 1.5
    17 5 170 273 0.62 0.0524 0.0027 0.0938 0.0046 0.0131 0.0003 301.9 114.8 91.0 4.2 84.1 1.6
    18 3 126 196 0.64 0.0500 0.0034 0.0846 0.0051 0.0126 0.0003 194.5 157.4 82.5 4.8 81.0 1.6
    19 4 160 258 0.62 0.0520 0.0032 0.0884 0.0051 0.0127 0.0003 283.4 110.2 86.0 4.8 81.1 1.6
    20 6 223 364 0.61 0.0512 0.0029 0.0850 0.0048 0.0121 0.0002 250.1 126.8 82.8 4.5 77.2 1.4
    21 8 380 448 0.85 0.0500 0.0026 0.0911 0.0046 0.0133 0.0002 194.5 122.2 88.6 4.3 84.9 1.3
    22 8 343 477 0.72 0.0507 0.0029 0.0860 0.0052 0.0123 0.0003 233.4 125.0 83.8 4.9 78.6 1.9
    23 4 133 221 0.60 0.0548 0.0030 0.0953 0.0056 0.0127 0.0002 466.7 124.1 92.5 5.2 81.1 1.6
    24 3 87 154 0.56 0.0599 0.0055 0.1046 0.0085 0.0136 0.0004 598.2 200.0 101.1 7.8 87.2 2.6
    25 5 152 343 0.44 0.0485 0.0029 0.0891 0.0049 0.0137 0.0002 120.5 133.3 86.7 4.5 87.4 1.6
    26 4 175 266 0.66 0.0513 0.0033 0.0877 0.0054 0.0126 0.0002 257.5 148.1 85.4 5.0 80.5 1.6
    27 6 273 356 0.77 0.0497 0.0033 0.0829 0.0050 0.0122 0.0003 183.4 147.2 80.9 4.7 78.5 2.0
    28 5 115 305 0.38 0.0894 0.0399 0.1572 0.0693 0.0129 0.0003 1413.0 963.8 148.3 60.9 82.8 2.0
    29 5 170 257 0.66 0.0482 0.0036 0.0868 0.0061 0.0133 0.0003 109.4 166.6 84.5 5.7 85.0 2.0
    30 5 193 280 0.69 0.0483 0.0030 0.0849 0.0048 0.0131 0.0003 122.3 131.5 82.7 4.5 83.9 1.9
    下载: 导出CSV
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出版历程
  • 收稿日期:  2016-06-19
  • 修回日期:  2017-03-20
  • 网络出版日期:  2023-08-15
  • 刊出日期:  2017-09-30

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