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浙南加里东期龙泉岩体年代学、地球化学特征及其地质意义

刘远栋 苏小浪 程海艳 张建芳 李翔 刘风龙

刘远栋, 苏小浪, 程海艳, 等, 2022. 浙南加里东期龙泉岩体年代学、地球化学特征及其地质意义. 地质力学学报, 28 (2): 237-256. DOI: 10.12090/j.issn.1006-6616.2021093
引用本文: 刘远栋, 苏小浪, 程海艳, 等, 2022. 浙南加里东期龙泉岩体年代学、地球化学特征及其地质意义. 地质力学学报, 28 (2): 237-256. DOI: 10.12090/j.issn.1006-6616.2021093
LIU Yuandong, SU Xiaolang, CHENG Haiyan, et al., 2022. Geochronological and geochemical characteristics of the Caledonian Longquan pluton in southern Zhejiang, and their geological significance. Journal of Geomechanics, 28 (2): 237-256. DOI: 10.12090/j.issn.1006-6616.2021093
Citation: LIU Yuandong, SU Xiaolang, CHENG Haiyan, et al., 2022. Geochronological and geochemical characteristics of the Caledonian Longquan pluton in southern Zhejiang, and their geological significance. Journal of Geomechanics, 28 (2): 237-256. DOI: 10.12090/j.issn.1006-6616.2021093

浙南加里东期龙泉岩体年代学、地球化学特征及其地质意义

doi: 10.12090/j.issn.1006-6616.2021093
基金项目: 

浙江省级基础性公益性战略性地质工作专项资金项目 2018006

中国地质调查局地质调查项目 12120114043101

详细信息
    作者简介:

    刘远栋(1986—),男,硕士,工程师,主要从事区域地质矿产调查、地质遗迹调查工作。E-mail:lyd661106@163.com

    通讯作者:

    张建芳(1985—),男,硕士,高级工程师,从事区域地质、矿产地质调查研究。E-mail:zhjianfang@126.com

  • 中图分类号: P588.12+1

Geochronological and geochemical characteristics of the Caledonian Longquan pluton in southern Zhejiang, and their geological significance

Funds: 

the Special Fund Project of Basic Public Welfare Strategic Geological Work of Zhejiang Province 2018006

the Geological Project of the China Geological Survey 12120114043101

  • 摘要: 龙泉岩体是浙南地区少有的加里东期花岗质岩体。岩石学、地球化学和年代学研究显示,龙泉岩体由花岗岩-二长花岗岩组合(花岗岩类)和英云闪长岩-奥长花岗岩-花岗闪长岩组合(TTG)组成,两类岩石组分普遍富集大离子亲石元素Rb、Ba、Th、U、K,亏损高场强元素Nb、Ta、P、Ti,显示岛弧岩浆岩的特征。TTG岩石的地球化学特征显示属于典型的高压型TTG,其岩浆来源于受俯冲板片流体作用的基性下地壳的重熔作用,而花岗岩类岩石则主要源于古老地壳沉积物的部分熔融,两者均未受地幔的明显混染。锆石SHRIMP U-Pb和锆石LA-ICP-MS U-Pb测年结果表明龙泉岩体的形成时间为443±3~410±3 Ma,结合岩石地球化学特征,指示晚至泥盆纪早期,龙泉地区还存在着洋壳的俯冲作用。

     

  • 图  1  龙泉岩体地质简图

    a-研究区大地构造位置图;b-龙泉岩体地质简图

    Figure  1.  Geological sketch map of the Longquan pluton

    (a)Tectonic map of the study area; (b)Geological sketch map of the Longquan pluton

    图  2  龙泉岩体不同岩石类型接触关系及野外照片

    a-花岗闪长岩侵入二长花岗岩中;b-花岗闪长岩中的花岗岩包体;c-细粒花岗岩;d-中细粒英云闪长岩

    Figure  2.  Field photos showing the contact relationship among different rock types of the Longquan pluton

    (a) Granodiorite intruded into monzogranite; (b) Granite inclusions in granodiorites; (c) Fine grained granite; (d) Medium-fine grained tonalite

    图  3  龙泉岩体主量元素岩石分类与岩石系列划分图解

    a-TAS图解(Middlemost,1994;1-橄榄辉长岩;2a-碱性辉长岩;2b-亚碱性辉长岩;3-辉长闪长岩;4-闪长岩;5-花岗闪长岩;6-花岗岩;7-硅英岩;8-二长辉长岩;9-二长闪长岩;10-二长岩;11-石英二长岩;12-正长岩;13-副长石辉长岩;14-副长石二长闪长岩;15-副长石二长正长岩;16-副长正长岩;17-副长深成岩;18-霓方钠岩/磷霞岩/粗白榴岩;Ir-Irvine分界线,上方为碱性,下方为亚碱性);b-An-Ab-Or图解(图中分区据O′Connor,1965);c-A/CNK-A/NK图解(Rickwood,1989);d-AFM图解(Irvine and Barager, 1971);e-AR-SiO2图解(Wright,1969);f-SiO2-K2O图解(Morrison,1980)

    Figure  3.  Diagrams showing the rock classification and rock series based on the major elements in the Longquan pluton

    (a) TAS plot (Middlemost, 1994; 1-olivine gabbro; 2a-alkaline gabbro; 2b-subalkaline gabbro; 3-gabbro diorite; 4-diorite; 5-granodiorite; 6-granite; 7-quartzolite; 8-monzogabbro; 9-monzodiorite; 10-monzonite; 11-adamellite; 12-syenite; 13-foid gabbro; 14-foid monzodiorite; 15-foid monzosyenite; 16-foid syenite; 17-foid plutonite; 18-tawite/urtite/italite; Ir-Irvine boundary, upper is basic, lower is alkaline); (b) An-Ab-Or plot (O′Connor, 1965); (c) A/CNK-A/NK plot (Rickwood, 1989); (d) AFM plot (Irvine and Barager, 1971); (e) AR-SiO2 plot (Wright, 1969); (f) SiO2-K2O plot(Morrison, 1980)

    图  4  龙泉岩体微量元素原始地幔标准化蛛网图

    a-花岗岩类; b-TTG岩类

    Figure  4.  Primitive mantle-normalized trace element spidergrams for the Longquan pluton

    (a) Granite; (b) TTG

    图  5  龙泉岩体稀土元素球粒陨石标准化分布型式图

    a-花岗岩类; b-TTG岩类

    Figure  5.  Chondrite-normalized REE pattern diagrams for the Longquan pluton

    (a) Granite; (b) TTG

    图  6  龙泉岩体各类岩石锆石阴极发光图像

    Figure  6.  Zircon cathodoluminescence image of various rocks in the Longquan pluton

    图  7  龙泉岩体各类岩石锆石U-Pb年龄谐和图

    Figure  7.  Zircon U-Pb age concordant diagram of various rocks in the Longquan pluton

    图  8  龙泉岩体成因类型判别图解

    a-岩石Y-Sr/Y判别图解;b-C/MF-A/MF图解(Altherr et al,2000);c-SiO2-Mg#图解;d-(Na2O+K2O+FeOT+MgO+TiO2)-(Na2O+K2O)/(FeOT+MgO+TiO2)图解(Patiño Douce, 1999);e-(CaO+FeOT+MgO+TiO2)-CaO/(FeOT+MgO+TiO2)图解(Patiño Douce, 1999);f-SiO2-MgO图解(邓晋福等,2010;HMA-高镁安山岩,MA-镁安山岩;PQ-高镁/低镁界线,RS-低镁/非镁界线)

    Figure  8.  Discrimination diagrams showing the genetic type of the Longquan pluton

    (a) Y-Sr/Y plot; (b) C/MF-A/MF plot (Altherr et al, 2000); (c) SiO2-Mg#plot; (d) (Na2O+K2O+FeOT+MgO+TiO2)-(Na2O+K2O)/(FeOT+MgO+TiO2) plot (Patiño Douce, 1999); (e) (CaO+FeOT+MgO+TiO2)-CaO/(FeOT+MgO+TiO2) plot (Patiño Douce, 1999); (f) SiO2-MgO plot (Deng et al.; 2010; HMA-High Magnesium andesite, MA-Magnesium andesite; PQ-Boundary of HMA/MA; RS-Boundary of MA/non-MA)

    图  9  龙泉岩体t-εNd(t)图解

    (据沈渭洲等,2008;DM-亏损地幔,CHUR-球粒陨石均一化源区)

    Figure  9.  Diagram in terms of t-εNd(t) for the Longquan pluton

    (modified after Shen et al, 2008; DM-Deficit mantle, CHUR-chondrite uniform reservoir)

    图  10  龙泉岩体Rb-(Nb+Y)图解和Rb-(Yb+Ta)图解(Pearce et al., 1984)

    VAG-火山弧花岗岩;ORG-洋脊花岗岩;WPG-板内花岗岩;syn-COLG-同碰撞花岗岩
    a-Rb-(Nb+Y)图解;b-Rb-(Yb+Ta)图解

    Figure  10.  Rb-(Nb+Y) diagram and Rb-(Yb+Ta) diagram for the Longquan pluton (Pearce et al., 1984)

    (a) Rb-(Nb+Ta) diagram; (b) Rb-(Yb+Ta) diagram
    VAG-Volcanic arc granite; ORG-Ocean ridge granite; WPG-Within plate granite; syn-COLG-syn-collisional granite

    表  1  龙泉岩体花岗岩类和TTG主量元素(%)、微量元素(×10-6)、稀土元素(×10-6)丰度表

    Table  1.   Major elements (%), trace and rare earth elements (10-6) of the Longquan granitoids and TTG rocks

    样号 PM002-9 PM002-22 D0418 D0382 PM002-36 PM002-15 D0380 PM002-37 D0016 D0470 D2172-1 D2172-2 *JS151 *JS155 *JS157
    岩石类型 花岗岩 二长花岗岩 石英二长岩 英云闪长岩 奥长花岗岩 花岗闪长岩 花岗岩
    SiO2 70.49 72.58 74.09 67.79 72.99 66.04 65.75 63.87 66.17 71.61 68.27 66.34 71.24 60.71 72.25
    TiO2 0.37 0.24 0.09 0.07 0.14 0.61 0.62 0.76 0.67 0.35 0.44 0.30 0.30 0.70 0.20
    Al2O3 15.27 14.26 13.58 17.49 14.48 16.71 12.04 17.03 15.05 15.18 13.56 16.32 14.38 15.17 13.97
    Fe2O3 1.88 0.85 0.13 0.30 0.60 3.77 2.09 1.35 0.92 1.31 0.60 1.20 0.89 1.98 0.68
    FeO 1.04 1.11 0.54 0.44 0.50 0.61 2.13 3.34 3.20 1.39 2.35 1.30 1.29 3.27 0.80
    MnO 0.05 0.05 0.03 0.02 0.03 0.09 0.07 0.10 0.09 0.07 0.05 0.09 0.05 0.08 0.03
    MgO 0.49 0.30 0.25 0.19 0.39 0.89 1.30 1.89 1.73 0.54 1.07 0.44 0.89 5.01 0.66
    CaO 1.25 0.92 1.09 0.53 0.44 1.28 2.64 3.93 3.98 0.52 3.48 2.70 2.16 2.14 1.07
    Na2O 3.98 3.70 3.62 4.34 4.25 2.83 5.88 3.50 3.75 4.35 4.75 5.46 4.07 3.51 4.00
    K2O 3.73 4.98 5.18 6.51 4.52 4.61 4.10 1.85 2.03 2.19 1.37 2.29 2.42 2.43 4.35
    P2O5 0.09 0.07 0.02 0.02 0.03 0.19 0.22 0.25 0.21 0.12 0.16 0.17 0.12 0.10 0.07
    LOI 1.17 0.78 1.07 0.95 0.85 2.21 2.83 1.68 1.74 1.62 3.46 2.94 1.16 5.00 1.38
    Rb 104.00 98.30 139.00 188.00 138.00 170.00 108.00 98.50 85.00 122.00 65.90 102.00 63.05 85.81 94.96
    Ba 1424.00 2294.00 899.00 961.00 1559.00 1311.00 786.00 628.00 903.00 588.00 389.00 331.00 1568.18 674.01 1433.00
    Th 18.60 16.60 15.40 18.60 16.50 13.10 9.95 8.81 8.40 7.18 7.68 5.38 15.10 8.62 11.40
    U 0.60 0.93 1.92 1.58 2.65 2.17 1.56 1.64 1.15 1.09 0.96 2.29 1.92 1.24 0.82
    Ta 0.38 0.18 7.05 0.51 0.29 0.92 0.87 1.29 0.51 0.98 0.44 2.57 0.38 0.48 0.22
    Nb 10.90 6.60 35.00 6.91 4.86 18.50 11.60 14.90 9.80 10.90 5.59 19.70 7.49 7.57 5.80
    Sr 191.00 279.00 177.00 261.00 204.00 262.00 417.00 415.00 468.00 284.00 320.00 198.00 472.47 344.36 359.80
    Zr 290.00 165.00 62.10 180.00 119.00 303.00 192.00 222.00 170.00 164.00 194.00 141.00 196.91 194.16 159.00
    Hf 7.85 4.81 2.74 6.18 3.53 9.02 4.67 8.69 7.47 3.84 5.02 3.47 4.38 4.73 4.19
    Cr 4.18 5.15 3.20 0.34 5.40 3.71 6.06 24.00 21.10 7.61 11.20 8.10 8.79 240.59 6.23
    Ni 3.50 3.80 2.90 0.79 4.80 5.60 3.02 8.60 9.90 6.41 5.03 6.01 3.16 134.76 2.14
    Co 3.01 2.06 2.00 0.91 3.50 3.14 4.99 10.20 9.57 4.74 6.55 3.88 3.98 21.26 2.39
    V 43.50 45.90 22.10 16.30 36.60 45.70 48.40 81.90 78.70 30.30 34.80 22.80 27.60 98.92 17.00
    Sc 3.00 2.18 1.57 1.72 2.16 12.10 3.38 10.40 7.97 3.85 3.88 3.65 4.12 13.70 2.95
    Cs 1.82 1.22 2.57 2.43 1.99 3.55 6.53 5.14 2.04 3.57 3.67 5.43 1.74 1.52 2.12
    Cd 0.04 0.04 0.02 0.30 0.03 0.14 0.26 0.07 0.03 0.29 0.03 0.30
    Li 12.60 9.44 8.49 8.46 11.10 22.80 13.40 62.00 25.00 22.90 25.10 17.10
    Y 7.78 6.24 12.40 8.94 5.15 35.00 8.53 20.00 9.51 9.65 3.87 8.93 7.17 13.38 5.51
    La 72.20 59.90 25.80 24.80 25.20 50.10 29.70 22.20 33.00 25.20 35.40 14.90 45.80 37.69 27.90
    Ce 120.00 82.40 48.80 44.00 46.60 99.60 53.60 41.50 56.90 36.00 60.40 27.00 73.60 69.09 46.70
    Pr 12.60 9.27 5.43 4.92 5.63 11.30 5.45 4.77 5.81 4.42 6.03 2.80 6.80 7.02 4.47
    Nd 46.50 33.20 19.50 18.50 20.10 50.50 20.30 18.60 23.60 16.50 21.60 11.00 21.60 25.37 14.70
    Sm 6.19 4.09 3.72 3.31 3.17 9.68 3.25 3.82 3.80 2.82 3.03 2.18 3.23 4.09 2.45
    Eu 1.15 0.82 0.60 0.87 0.82 1.84 0.89 1.10 0.87 0.87 0.77 0.61 0.88 0.97 9.67
    Gd 3.47 2.38 3.00 3.15 2.21 7.58 3.31 3.83 2.70 2.99 1.94 2.40 2.27 3.05 1.65
    Tb 0.42 0.31 0.46 0.33 0.26 1.26 0.34 0.65 0.42 0.34 0.20 0.31 0.28 0.40 0.23
    Dy 1.70 1.36 2.33 1.80 1.26 6.74 1.88 3.82 1.98 1.99 0.86 1.84 1.26 2.50 1.10
    Ho 0.28 0.23 0.43 0.31 0.20 1.30 0.32 0.72 0.36 0.34 0.14 0.29 0.25 0.55 0.19
    Er 0.72 0.63 1.10 1.00 0.43 3.54 1.04 1.96 0.95 1.07 0.35 0.88 0.62 1.57 0.50
    Tm 0.08 0.08 0.17 0.13 0.06 0.48 0.13 0.31 0.13 0.13 0.05 0.11 0.10 0.23 0.07
    Yb 0.55 0.54 1.04 0.99 0.36 3.08 0.93 1.79 0.79 0.89 0.30 0.80 0.67 1.56 0.50
    Lu 0.09 0.09 0.15 0.15 0.05 0.43 0.13 0.24 0.13 0.12 0.04 0.11 0.10 0.23 0.08
    δEu 0.69 0.74 0.53 0.81 0.90 0.63 0.82 0.87 0.79 0.91 0.91 0.81 0.94 0.80 0.96
    δCe 0.90 0.77 0.96 0.92 0.92 0.99 0.96 0.94 0.93 0.77 0.93 0.96 0.91 0.97 0.93
    注:标记为“*”的样品引自《1∶25万衢州幅区域地质调查报告》(浙江省地质调查院,2013)
    下载: 导出CSV

    表  2  龙泉岩体LA-ICP-MS锆石U-Pb测年结果

    Table  2.   LA-ICP-MS Zircon U-Pb dating for the Longquan felsic rocks

    样品号及岩性 测点号 Th232/×10-6 U238/×10-6 Th/U 同位素比值 同位素年龄/Ma
    207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ
    D0382花岗岩 1 422 1338 0.31 0.0546 0.0008 0.5286 0.0087 0.0702 0.0010 395 33 431 6 438 6
    2 458 1379 0.33 0.0551 0.0008 0.5484 0.0094 0.0722 0.0010 417 35 444 6 449 6
    3 1344 3249 0.41 0.0568 0.0008 0.5505 0.0089 0.0704 0.0010 482 32 445 6 438 6
    4 610 1604 0.38 0.0550 0.0007 0.5411 0.0084 0.0714 0.0010 412 30 439 6 444 6
    5 395 1381 0.29 0.0557 0.0009 0.5494 0.0095 0.0716 0.0010 438 35 445 6 446 6
    6 750 1892 0.40 0.0548 0.0009 0.5467 0.0103 0.0724 0.0010 404 39 443 7 450 6
    7 908 2331 0.39 0.0557 0.0008 0.5473 0.0090 0.0713 0.0010 441 33 443 6 444 6
    8 971 2379 0.41 0.0558 0.0009 0.5509 0.0097 0.0716 0.0010 444 36 446 6 446 6
    9 1281 3150 0.41 0.0557 0.0007 0.5471 0.0084 0.0713 0.0010 439 29 443 6 444 6
    10 1319 2874 0.46 0.0556 0.0007 0.5418 0.0080 0.0707 0.0010 435 28 440 5 440 6
    11 487 1608 0.30 0.0550 0.0010 0.5341 0.0107 0.0705 0.0010 411 42 435 7 439 6
    12 732 1487 0.49 0.0552 0.0008 0.5364 0.0085 0.0705 0.0010 421 31 436 6 439 6
    13 1410 3229 0.44 0.0554 0.0007 0.5454 0.0083 0.0714 0.0010 429 29 442 5 444 6
    14 481 1344 0.36 0.0550 0.0008 0.5411 0.0086 0.0713 0.0010 413 31 439 6 444 6
    D0380石英二长岩 1 292 787 0.37 0.0543 0.0011 0.5099 0.0104 0.0681 0.0009 384 46 418 7 425 6
    2 592 612 0.97 0.0553 0.0010 0.5113 0.0095 0.0670 0.0009 426 41 419 6 418 5
    3 199 222 0.90 0.0551 0.0013 0.5093 0.0123 0.0670 0.0010 417 55 418 8 418 6
    4 484 716 0.68 0.0586 0.0017 0.5382 0.0151 0.0667 0.0010 551 64 437 10 416 6
    5 521 518 1.01 0.0552 0.0011 0.5136 0.0101 0.0674 0.0009 422 43 421 7 421 6
    6 247 245 1.01 0.0584 0.0016 0.5151 0.0138 0.0640 0.0010 545 61 422 9 400 6
    7 440 899 0.49 0.0550 0.0009 0.5133 0.0086 0.0677 0.0009 411 35 421 6 422 5
    8 268 296 0.90 0.0549 0.0013 0.5072 0.0117 0.0670 0.0009 408 52 417 8 418 6
    9 212 327 0.65 0.0539 0.0011 0.4949 0.0105 0.0666 0.0009 369 48 408 7 415 6
    10 372 424 0.88 0.0547 0.0012 0.5082 0.0115 0.0674 0.0010 398 51 417 8 421 6
    11 301 517 0.58 0.0544 0.0010 0.5055 0.0096 0.0674 0.0009 389 42 415 6 420 5
    12 291 276 1.05 0.0544 0.0015 0.5047 0.0135 0.0673 0.0010 388 62 415 9 420 6
    PM002-36二长花岗岩 1 367 271 1.35 0.0525 0.0017 0.5105 0.0159 0.0705 0.0011 307 73 419 11 439 6
    2 431 341 1.27 0.0551 0.0013 0.5259 0.0124 0.0692 0.0010 417 53 429 8 431 6
    3 243 244 1.00 0.0549 0.0021 0.5287 0.0199 0.0698 0.0012 409 88 431 13 435 7
    4 385 286 1.34 0.0554 0.0013 0.5265 0.0124 0.0689 0.0010 428 54 429 8 430 6
    5 190 188 1.01 0.0560 0.0015 0.5348 0.0146 0.0692 0.0010 454 62 435 10 431 6
    6 438 492 0.89 0.0559 0.0015 0.5289 0.0144 0.0687 0.0010 446 63 431 10 428 6
    7 262 266 0.98 0.0550 0.0012 0.5274 0.0118 0.0695 0.0009 413 51 430 8 433 6
    8 174 176 0.99 0.0545 0.0038 0.5232 0.0346 0.0695 0.0017 393 159 427 23 433 10
    9 376 262 1.44 0.0550 0.0013 0.5220 0.0120 0.0688 0.0009 413 52 426 8 429 6
    10 429 331 1.29 0.0548 0.0012 0.5210 0.0117 0.0689 0.0009 404 51 426 8 430 6
    11 77 79 0.97 0.0552 0.0033 0.5244 0.0305 0.0689 0.0014 421 137 428 20 429 9
    12 629 355 1.77 0.0551 0.0013 0.5250 0.0126 0.0691 0.0010 417 55 428 8 430 6
    13 181 200 0.90 0.0566 0.0018 0.5412 0.0173 0.0693 0.0011 475 74 439 11 432 6
    14 505 529 0.95 0.0558 0.0010 0.5342 0.0103 0.0694 0.0009 445 42 435 7 433 6
    15 82 183 0.45 0.0545 0.0017 0.5180 0.0161 0.0689 0.0010 391 73 424 11 430 6
    PM002-37英云闪长岩 1 60 91 0.66 0.0557 0.0019 0.6036 0.0199 0.0786 0.0012 439 76 479 13 488 7
    2 191 974 0.20 0.0550 0.0008 0.5116 0.0084 0.0674 0.0009 414 35 420 6 421 5
    3 92 61 1.51 0.0563 0.0028 0.5279 0.0261 0.0681 0.0012 463 115 430 17 424 7
    4 65 920 0.07 0.0827 0.0010 2.3563 0.0331 0.2066 0.0026 1263 25 1229 10 1211 14
    5 101 134 0.76 0.0561 0.0022 0.5227 0.0198 0.0676 0.0011 457 88 427 13 421 7
    6 842 1322 0.64 0.0560 0.0010 0.5313 0.0099 0.0688 0.0009 453 41 433 7 429 6
    7 363 912 0.40 0.0981 0.0012 3.6321 0.0502 0.2687 0.0034 1587 23 1557 11 1534 17
    8 286 213 1.34 0.2453 0.0030 20.3636 0.2833 0.6023 0.0078 3154 20 3109 13 3039 31
    9 409 266 1.54 0.0555 0.0016 0.5173 0.0144 0.0676 0.0010 434 64 423 10 421 6
    10 153 470 0.32 0.1535 0.0032 8.5164 0.1384 0.4025 0.0051 2385 36 2288 15 2180 23
    11 61 98 0.62 0.0670 0.0015 1.2758 0.0281 0.1381 0.0020 838 46 835 13 834 11
    12 89 108 0.82 0.0624 0.0015 1.0380 0.0251 0.1207 0.0017 688 52 723 12 734 10
    13 217 147 1.48 0.0555 0.0019 0.5175 0.0173 0.0677 0.0011 430 77 423 12 422 6
    14 1137 478 2.38 0.0564 0.0013 0.5265 0.0124 0.0677 0.0010 469 53 429 8 422 6
    15 191 411 0.46 0.0544 0.0013 0.5084 0.0119 0.0677 0.0010 389 53 417 8 423 6
    16 112 80 1.41 0.0549 0.0040 0.5164 0.0363 0.0682 0.0017 409 167 423 24 425 10
    17 445 248 1.79 0.0548 0.0014 0.5162 0.0130 0.0683 0.0010 404 57 423 9 426 6
    18 738 832 0.89 0.0549 0.0011 0.5185 0.0105 0.0685 0.0009 409 45 424 7 427 6
    19 922 936 0.99 0.0551 0.0015 0.5158 0.0137 0.0680 0.0010 414 61 422 9 424 6
    20 204 120 1.70 0.0548 0.0030 0.5197 0.0273 0.0688 0.0014 404 125 425 18 429 9
    下载: 导出CSV

    表  3  龙泉岩体SHRIMP锆石U-Pb测年结果

    Table  3.   SHRIMP Zircon U-Pb dating of Longquan felsic rocks

    样品号及岩性 测点号 206Pbc/% U/×10-6 Th/×10-6 232Th/238U 206Pb*/×10-6 年龄/Ma 同位素比值
    206Pb/238U 1σ 207Pb/206Pb 1σ 208Pb/232Th 1σ 207Pb*/206Pb* ±/% 207Pb*/235U ±/% 206Pb*/238U ±/% error
    D0016英云闪长岩 1 0.38 126 56 0.46 7.9 449 11 323 98 391 19 0.0529 4.3 0.526 5.0 0.0721 2.6 0.516
    2 0.00 353 354 1.04 21.3 437 10 357 43 425 12 0.0537 1.9 0.519 3.1 0.0702 2.5 0.791
    3.1 0.17 194 230 1.22 11.6 433 11 330 65 425 13 0.0530 2.9 0.508 3.8 0.0695 2.6 0.667
    3.2 0.42 145 133 0.95 9.3 464 12 514 71 478 16 0.0576 3.2 0.592 4.1 0.0746 2.6 0.627
    4 0.18 303 360 1.23 18.4 440 11 371 50 437 12 0.0540 2.2 0.526 3.3 0.0706 2.5 0.746
    5 0.00 180 35 0.20 11.1 448 11 361 66 413 18 0.0538 2.9 0.533 3.9 0.0719 2.5 0.656
    6 0.14 351 266 0.78 20.9 432 10 368 71 420 13 0.0539 3.1 0.515 4.0 0.0692 2.5 0.620
    7 0.15 261 65 0.26 15.9 442 13 360 54 412 18 0.0537 2.4 0.526 3.8 0.0710 3.0 0.779
    8 -- 364 154 0.44 21.8 435 10 439 42 475 14 0.0557 1.9 0.536 3.1 0.0698 2.5 0.796
    9 0.13 366 390 1.10 22.2 438 11 383 43 427 12 0.0543 1.9 0.527 3.2 0.0704 2.5 0.791
    10 0.00 327 157 0.50 19.0 421 10 467 45 461 24 0.0564 2.0 0.524 3.2 0.0674 2.5 0.773
    11 0.08 412 291 0.73 24.0 422 10 425 41 423 12 0.0553 1.9 0.516 3.1 0.0677 2.5 0.799
    D2172奥长花岗岩 1 0.17 233 24 0.11 13.5 421 10 373 97 386 66 0.0540 4.3 0.503 5.0 0.0675 2.5 0.505
    2 0.31 308 225 0.76 18.2 428 10 356 71 425 14 0.0536 3.2 0.507 4.0 0.0686 2.5 0.619
    3 0.07 568 423 0.77 32.5 416 10 379 35 404 11 0.0542 1.6 0.498 2.9 0.0666 2.5 0.845
    4 0.08 457 438 0.99 26.0 413 10 339 39 404 11 0.0533 1.7 0.485 3.0 0.0661 2.4 0.819
    5 0.24 188 128 0.71 11.0 424 10 337 71 419 14 0.0532 3.1 0.498 4.0 0.0679 2.5 0.630
    6 0.18 284 222 0.81 16.5 422 10 332 66 413 13 0.0531 2.9 0.495 3.8 0.0677 2.5 0.653
    7 0.16 410 403 1.02 23.0 407 10 362 46 398 11 0.0538 2.1 0.483 3.2 0.0651 2.5 0.768
    8 1.37 119 84 0.74 6.8 411 11 382 190 379 24 0.0543 8.6 0.492 9.0 0.0658 2.7 0.296
    9 0.17 323 222 0.71 18.4 414 10 341 48 404 12 0.0533 2.1 0.487 3.3 0.0663 2.5 0.758
    10 0.19 238 153 0.66 14.1 429 10 368 60 411 13 0.0539 2.7 0.511 3.7 0.0687 2.5 0.684
    11 0.11 244 229 0.97 14.1 420 10 401 70 410 13 0.0547 3.1 0.508 4.0 0.0673 2.5 0.623
    12 0.19 700 80 0.12 39.5 409 10 410 51 435 32 0.0550 2.3 0.497 3.3 0.0656 2.4 0.731
    13 0.08 402 70 0.18 22.5 406 10 461 41 422 27 0.0562 1.9 0.504 3.1 0.0650 2.5 0.797
    14 0.61 165 104 0.65 10.0 439 11 361 130 393 20 0.0538 5.7 0.523 6.2 0.0705 2.6 0.415
    注:Pbc和Pb*分别代表普通铅和放射性铅
    下载: 导出CSV

    表  4  龙泉岩体Sr、Nd同位素组成

    Table  4.   Sr and Nd isotopic compositions of the Longquan pluton

    样号 D7008 D7007 D2792 D2797
    岩性 英云闪长岩 花岗闪长岩 二长花岗岩
    年龄/Ma 413 413 413 415
    Rb/×10-6 64.52 61.97 85.81 90.58
    Sr/×10-6 421.76 491.96 344.36 291.26
    87Rb/86Sr 0.442968 0.364743 0.900465 0.721556
    87Sr/86Sr 0.711387 0.710705 0.712980 0.712475
    ISr 0.708782 0.708560 0.707658 0.708231
    Sm/×10-6 2.32 3.24 4.09 1.75
    Nd/×10-6 14.46 19.27 25.37 10.97
    147Sm/144Nd 0.097583 0.102228 0.097202 0.098115
    143Nd/144Nd 0.512207 0.512308 0.512230 0.512002
    INd 0.511943 0.512032 0.511966 0.511737
    εSr(t) 67.7 64.6 51.8 59.9
    εNd(t) -3.2 -1.5 -2.7 -7.2
    fSm/Nd -0.50 -0.48 -0.51 -0.50
    TDM/Ma 1239 1153 1205 1514
    T2DM/Ma 1415 1275 1376 1742
    注:数据引用自《1∶25万衢州幅区域地质调查报告》(浙江省地质调查院,2013)
    下载: 导出CSV

    表  5  龙泉岩体同位素年龄一览表

    Table  5.   Isotopic age table of the Longquan pluton

    样号 岩性 岩类 年龄/Ma 测试方法 资料来源
    JS151 花岗闪长岩 TTG 410±3 LA-ICP-MS 浙江省地质调查院,2015
    D2172 奥长花岗岩 418±5 SHRIMP 此次研究
    JS155 花岗闪长岩 419+5 LA-ICP-MS 浙江省地质调查院,2015
    PM002-37 英云闪长岩 424±3 LA-ICP-MS 此次研究
    D0016 英云闪长岩 437±6 SHRIMP 此次研究
    D0380 石英二长岩 花岗岩 418±3 LA-ICP-MS 此次研究
    PM002-36 二长花岗岩 432±3 LA-ICP-MS 此次研究
    D0382 花岗岩 443±3 LA-ICP-MS 此次研究
    下载: 导出CSV
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