地球科学进展

地球科学进展 ›› 2015, Vol. 30 ›› Issue (9): 1034 -1049. doi: 10.11867/j.issn.1001-8166.2015.09.1034

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中祁连西段花岗岩类的地球化学特征及构造意义
侯荣娜 1( ), 王淑华 1, 张翔 2, 侯克选 1, 张铖 3, 王金荣 1, *( )   
  1. 1.兰州大学地质科学与矿产资源学院 甘肃省西部矿产资源重点实验室(兰州大学),甘肃 兰州 730000
    2.甘肃省地质调查院,甘肃 兰州 730000
    3.甘肃省地质矿产开发局第二勘查院,甘肃 兰州 730000
  • 收稿日期:2015-07-15 修回日期:2015-08-27 出版日期:2015-09-20
  • 通讯作者: 王金荣 E-mail:hourn09@lzu.edu.cn;jrwang@lzu.edu.cn
  • 基金资助:
    甘肃省科技重大专项计划项目“祁连山造山带西段石板墩铁矿床赋矿层位及找矿预测研究”(编号：1002FKDA042);中央高校基本科研业务费专项资金“中祁连西段野马南山火成岩组合及其构造意义”(编号：lzujbky-2013-113)资助

Geochemical Characteristics and Tectonic Significance of the Granotoids in the Western Section of the Mid-Qilian

Rongna Hou 1( ), Shuhua Wang 1, Xiang Zhang 2, Kexuan Hou 1, Cheng Zhang 3, Jinrong Wang 1( )   

  1. 1.Key Laboratory of Mineral Resources in Western China (Gansu Province), School of Earth Sciences, Lanzhou University, Lanzhou 730000, China
    2. Geological Survey of Gansu Province, Lanzhou 730000, China
    3. Second Institute of Geological and Mineral Exploration of Gansu Provincial Bureau of Geology and Mineral Resources, Lanzhou 730000, China
  • Received:2015-07-15 Revised:2015-08-27 Online:2015-09-20 Published:2015-09-20
全文 ( 4 ) 下载PDF ( 1348 )

中祁连西段石板墩地区北部及南部发育有辉长岩、闪长岩及花岗岩。北带岩体的LA-ICP-MS锆石U-Pb年龄为（469.3±2.8）Ma,（461.2±3.3）Ma和（470.0±2.5）Ma;岩石SiO2质量百分含量为53.2%~66.11%,高Al,Ti,Mg,Fe,Ca,K,Na,A/CNK<1.1;富集大离子亲石元素Rb,K和Pb,亏损高场强元素Nb,Ta,Ce,Sr,Hf,Ti;REE总量较高,LREE富集、HREE近平坦型分布,中等的负Eu异常,δEu=0.6;此外,在构造判别图中,样品落于岛弧环境。南带岩体LA-ICP-MS锆石U-Pb年龄为（470.9±2.8）Ma和（472.3±4.2）Ma,岩石SiO2质量百分含量较高（67.13%~70.73%）,高Al,Mg,Fe,Ca,富Na贫K,A/CNK<1.1;岩石表现为明显的高Sr低Yb,Y的特点,富集大离子亲石元素R,K,Sr等,亏损高场强元素Nb,Ta,P,Ti等;REE总量较低,LREE富集、HREE亏损,轻重稀土分异明显,轻微的负Eu异常至正异常,δEu=0.74~1.18。研究表明,北带岩体为地幔楔部分熔融产生的,形成于岛弧环境;南带岩体为消减的大洋岩石圈板块部分熔融产生的埃达克岩,是北祁连向南俯冲导致的岩浆作用的产物,“中祁连西段”是早古生代时期在“残留的微陆块”基础上形成的一个岛弧增生杂岩地体。

关键词: 中祁连西段, 岛弧, 埃达克岩, 早古生代

Granotoids, mainly gabbro, diorite and granite, are greatly rich in the northern and southern parts of Shibandun area, western section of the Mid-Qilian. LA-ICP-MS zircon and U-Pb dating methods indicate that the age of the rock from the northern belt were（469.3±2.8）Ma,（461.2±3.3）Ma and (470.0±2.5) Ma, respectively. The SiO2 content of the northern rock mass ranges from 53.2% to 66.1% with high content of the Al, Ti, Mg, Fe, Ca, K, Na in the rock mass and A/CNK<1.1. The rock analysis shows enrichment of large ion lithophile elements (LILE) (e.g., Rb, K) and Pb, and depletion of high field strength elements (HFSE) (e.g., Nb, Ta, Ce, Sr, Hf and Ti). The results also indicate LREE enriched pattern with high ∑REE abundance, flat HREE and moderate negative Eu anomaly (δEu=0.6). Tectonic discrimination diagrams showed that the samples are located in the arc environment. The age of the rock from the southern belt are respectively （470.9±2.8） Ma and （472.3±4.2） Ma based on LA-ICP-MS zircon U-Pb dating methods. The southern rock mass contains high amount of the Al, Mg, Fe, Ca and is rich in Na and poor in K (A/CNK<1.1). Rock analysis results show the enrichment of large ion lithophile elements (LILE) (e.g., Rb, K and Sr) and depletion of high field strength elements (HFSE) (e.g., Nb, Ta, Ti and P), and also indicate a LREE enriched pattern with rather low ∑REE, depleted HREE and obvious differentiation in Eu, which is from slight negative to positive anomaly (δEu=0.74~1.18). Our study shows that the northern belt was formed by partial melting of mantle wedge in an island-arc environment, while the southern belt is adakites generated by partial melting of Adakites, and is also the product from the magmatic process by the North Qilian southward subduction. The western part of the Mid-Qilian is an island arc hyperplasia complex created on a remained microcontinental in early Paleozoic.

Key words: The western section of the Mid-Qilian, Island arc, Adakites, Early Paleozoic.

中图分类号: 

图1 研究区区域地质构造图 1:第四系;2:新近系;3:古近系;4:寒武系;5:青白口系哈什哈尔组;6:青白口系五个山组;7:蓟县系花儿地组c岩组;8:蓟县系花儿地组b岩组;9:蓟县系南白水河组;10:长城系南白水河组;11:肉红色中细粒花岗岩;12:灰白色花岗闪长岩;13:灰绿色中细粒英云闪长岩;14:玄武安山岩;15:辉长岩;16:橄辉岩;17:不整合界线;18:逆断层;19:正断层;20:实测性质不明断层;21:采样点
Fig.1 Regional tectonic map of the studied area 1：Quaternary System; 2: Neogene System; 3:Paleogene System; 4: Cambrian System; 5: Qingbaikou System Hashihar Fm; 6:Qingbaikou System Wugeshan Fm; 7: Jixian System Huaerdi Fm c rock group; 8: Jixian System Huaerdi Fm b rock group; 9:Jixian System Nanbaishuihe Fm; 10:Changcheng System Nanbaishuihe Fm; 11:Fine-Medium grained granite in flesh pink; 12: Gray granite diorite; 13: Fine-Medium Tonalite in celadon; 14: Basaltic Andesite; 15: Gabbro; 16: Peridotite; 17: Unconformity Boundary; 18: Thrust fault; 19: Normal fault; 20: The measured properties unknown fault; 21: Sampling points
表1 岩石LA-ICP-MS锆石U-Pb年龄分析结果
Table 1 Dating of the Zircon LA-ICP-MS U-Pb age of the rocks
样品号及 Pb Th U Th/U 同位素比值 表面年龄
分析点号 ×10-6 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/235U 1σ 206Pb/238U 1σ
YQ6-01 114.72 136.06 351.23 0.387 0.59048 0.01357 0.07536 0.00098 471 9 468 6
YQ6-02 107.01 190.14 324.63 0.586 0.57939 0.01372 0.07406 0.00097 464 9 461 6
YQ6-03 74.38 80.15 223.21 0.359 0.58162 0.01405 0.07727 0.00103 466 9 480 6
YQ6-04 62.39 121.05 180.33 0.671 0.60265 0.01635 0.07719 0.00105 479 10 479 7
YQ6-05 50.16 81.63 146.74 0.556 0.59809 0.02621 0.07705 0.00122 476 17 478 8
YQ6-06 109.92 133.69 339.49 0.394 0.57524 0.01289 0.07471 0.00098 461 8 464 6
YQ6-07 54.79 69.52 165.84 0.419 0.59555 0.02026 0.07586 0.00107 474 13 471 6
YQ6-08 88.91 195.4 257.21 0.76 0.59613 0.01453 0.07649 0.00102 475 9 475 6
YQ6-09 55.29 96.74 160.88 0.601 0.6085 0.01819 0.07746 0.00107 483 11 481 7
YQ6-10 51.13 87.78 147.76 0.594 0.64161 0.02021 0.07747 0.00108 503 13 481 8
YQ6-11 76.72 125.47 229.5 0.547 0.59915 0.01647 0.07595 0.00102 477 10 472 6
YQ6-12 56.31 91.49 165.76 0.552 0.61131 0.02024 0.07708 0.00108 484 13 479 8
YQ6-13 43.91 71.36 130.52 0.547 0.59172 0.01767 0.07624 0.00107 472 11 474 7
YQ6-14 72.03 161 214.96 0.749 0.57073 0.0149 0.07446 0.00101 458 10 463 6
YQ6-15 73.05 163.95 223.23 0.734 0.55973 0.0146 0.07245 0.00098 451 10 451 6
YQ6-16 66.4 125.77 196.3 0.641 0.60959 0.01775 0.07591 0.00103 483 11 472 7
YQ6-17 87.42 174.66 260.6 0.67 0.58592 0.01432 0.07527 0.001 468 9 468 6
YQ6-18 61.65 109.54 183.78 0.596 0.5923 0.01703 0.07595 0.00104 472 11 472 6
YQ6-19 56.99 114.74 168.44 0.681 0.59276 0.01715 0.07582 0.00105 473 11 471 6
YQ6-20 74.3 89.28 227.89 0.392 0.59039 0.01621 0.07558 0.00102 471 10 470 6
YQ6-21 76.48 143.16 229.37 0.624 0.58752 0.01598 0.07523 0.00102 469 10 468 6
YQ6-22 65.98 96.77 194.3 0.498 0.57881 0.01648 0.07443 0.00102 464 11 463 7
YQ6-23 85.45 147.92 258.01 0.573 0.58618 0.01498 0.07515 0.00101 468 10 467 6
YQ6-24 61.96 133.17 182.19 0.731 0.59104 0.01717 0.07582 0.00105 472 11 471 6
YQ6-25 49.51 78.48 149.84 0.524 0.58566 0.01788 0.07532 0.00106 468 11 468 7
YQ6-26 63.37 100.56 187.56 0.536 0.54618 0.0151 0.07371 0.00101 442 10 458 6
YQ6-27 41.514 64.02 122.01 0.525 0.60295 0.01844 0.0779 0.0011 479 12 484 8
YQ6-28 68.04 124.6 205.74 0.606 0.58369 0.01703 0.07438 0.00102 467 11 462 6
YQ6-29 63.4 96.37 189.53 0.508 0.63882 0.01796 0.07598 0.00104 502 11 472 6
YQ6-30 91.37 99.89 286.73 0.348 0.59788 0.01537 0.0741 0.00099 476 10 461 6
YQ10-01 238.41 539.16 698.35 0.772048 0.58316 0.01331 0.07505 0.00098 466 9 467 6
YQ10-02 135.91 244.81 407.33 0.601011 0.58349 0.01458 0.07508 0.001 467 9 467 6
YQ10-03 141.23 301.78 417.6 0.722653 0.58507 0.01516 0.07467 0.001 468 10 464 8
YQ10-04 228.06 347.61 713.06 0.487491 0.56249 0.01206 0.0728 0.00094 453 8 453 6
YQ10-06 158.36 267.74 490.26 0.546118 0.56578 0.01342 0.07304 0.00097 455 9 454 6
YQ10-07 271.8 761.37 773.93 0.983771 0.60775 0.01277 0.07618 0.00099 482 8 473 6
YQ10-09 144.93 232.18 441.94 0.525365 0.58661 0.01337 0.0743 0.00097 469 9 462 6
YQ10-11 151.08 272.53 461.7 0.590275 0.59106 0.01501 0.07347 0.00098 472 10 457 8
YQ10-12 519.95 2079.92 1429.93 1.454561 0.59676 0.01235 0.07608 0.00098 475 8 473 6
YQ10-13 100.71 141.46 300.92 0.470092 0.59801 0.0168 0.07632 0.00105 476 11 474 8
YQ10-14 129.9 209.31 393.07 0.532501 0.58428 0.01564 0.075 0.00102 467 10 466 8
YQ10-15 112.37 110.88 340.05 0.32607 0.59984 0.01915 0.07682 0.00109 477 12 477 7
YQ10-16 211.76 464.55 639.98 0.725882 0.58098 0.01361 0.07374 0.00097 465 9 459 6
YQ10-17 238.44 381.31 743.37 0.512948 0.57954 0.0126 0.07294 0.00095 464 8 454 6
YQ10-18 274.06 670.04 827.57 0.809648 0.57188 0.01297 0.07276 0.00095 459 8 453 6
YQ10-19 113.17 181.25 350.77 0.51672 0.57565 0.01526 0.07342 0.00099 462 10 457 7
YQ10-20 222.11 454.21 665.59 0.682417 0.61198 0.01449 0.07406 0.00098 485 9 461 6
YQ10-24 110.68 194.14 331.6 0.585464 0.58379 0.01589 0.0753 0.00102 467 10 468 7
YQ10-25 216.02 248.4 670.1 0.370691 0.58093 0.01312 0.07456 0.00098 465 8 464 6
YQ10-27 242.75 510.02 719.71 0.708647 0.58979 0.01304 0.07441 0.00097 471 8 463 6
YQ10-29 172.71 334.02 523.64 0.637881 0.57359 0.01559 0.07413 0.00101 460 10 461 7
YQ10-30 242.36 551.92 739.94 0.745898 0.56739 0.0137 0.07258 0.00096 456 9 452 6
YQ11-01 161 284.89 487.97 0.583827 0.57884 0.01457 0.07479 0.001 464 9 465 6
YQ11-02 304.67 747.44 871.11 0.858032 0.60645 0.015 0.07669 0.00102 481 9 476 6
YQ11-03 146.19 212.06 441.94 0.479839 0.59248 0.01543 0.07568 0.00102 472 10 470 6
YQ11-04 198.6 468.12 576.56 0.811919 0.59648 0.01444 0.07586 0.00101 475 9 471 6
YQ11-05 218.57 500.99 625.65 0.800751 0.63247 0.01614 0.07698 0.00104 498 10 478 6
YQ11-06 140.55 290.25 421.97 0.687845 0.58096 0.01519 0.07453 0.001 465 10 463 6
YQ11-07 333.39 834.29 962.19 0.867074 0.59308 0.01356 0.07595 0.001 473 9 472 6
YQ11-08 234.99 524.04 682.97 0.767296 0.59531 0.0155 0.07641 0.00103 474 10 475 6
YQ11-09 313.53 816.07 908.95 0.897816 0.61463 0.01475 0.07439 0.00099 486 9 463 6
YQ11-10 205.71 473.53 614.33 0.770807 0.5824 0.01385 0.07408 0.00098 466 9 461 6
YQ11-12 252.33 489.15 726.62 0.673185 0.60562 0.01479 0.07699 0.00103 481 9 478 6
YQ11-13 202.35 418.49 603.57 0.693358 0.62167 0.01466 0.07399 0.00098 491 9 460 6
YQ11-14 276.98 625.91 809.38 0.77332 0.59138 0.01371 0.07569 0.001 472 9 470 6
YQ11-16 386.46 1028.05 1102.78 0.932235 0.61763 0.01442 0.07621 0.00101 488 9 473 6
YQ11-17 169.47 325.53 497.01 0.654977 0.60374 0.01705 0.07646 0.00105 480 11 475 6
YQ11-19 216.89 430.47 638.27 0.674432 0.62603 0.01595 0.07549 0.00102 469 17 467 6
YQ11-21 433.95 1128.09 1231.89 0.915739 0.62814 0.01441 0.07606 0.001 495 9 473 6
YQ11-22 214.18 484.96 625.78 0.774969 0.65989 0.01658 0.07568 0.00102 515 10 470 6
YQ11-23 214.64 392.69 629.86 0.623456 0.59946 0.01523 0.07678 0.00103 477 10 477 6
YQ11-28 132.2 227.64 394.38 0.57721 0.59779 0.01703 0.07603 0.00105 476 11 472 6
YQ11-29 259.62 592.8 778.64 0.761327 0.57377 0.01437 0.07415 0.001 460 9 461 6
YQ11-30 190.48 395.77 562.36 0.703766 0.59584 0.01581 0.07583 0.00103 475 10 471 6
YQ26-01 395.52 369.87 1192.22 0.310236 0.68272 0.01703 0.07703 0.00104 502 13 476 8
YQ26-02 95.96 97.73 295.4 0.33084 0.59997 0.0177 0.07616 0.00106 477 11 473 6
YQ26-03 535.15 1680.58 1544.15 1.088353 0.58422 0.01468 0.0746 0.001 467 9 464 6
YQ26-04 824.68 988.78 2551.21 0.387573 0.61135 0.01515 0.07483 0.00101 484 10 465 6
YQ26-06 95.98 90.33 297.37 0.303763 0.59446 0.01784 0.07605 0.00107 474 11 473 7
YQ26-07 430.26 471.05 1324.4 0.35567 0.59684 0.01529 0.07602 0.00103 475 10 472 6
YQ26-08 121.3 101.1 379.13 0.266663 0.58907 0.01758 0.07576 0.00106 470 11 471 6
YQ26-09 162.06 173.58 491.42 0.353221 0.60386 0.01702 0.07726 0.00107 480 11 480 6
YQ26-10 116.67 127.64 360.7 0.353867 0.59698 0.01826 0.07578 0.00107 475 12 471 8
YQ26-11 143.6 175.75 440.95 0.398571 0.59552 0.01682 0.07583 0.00105 474 11 471 6
YQ26-13 490.28 655.2 1505.47 0.435213 0.59045 0.01517 0.07574 0.00103 471 10 471 6
YQ26-14 195.41 208.46 596.3 0.349589 0.58971 0.01691 0.07535 0.00105 471 11 468 7
YQ26-16 137.75 135.84 427.69 0.317613 0.58864 0.01674 0.07581 0.00105 470 11 471 6
YQ26-17 163.92 217.57 482.66 0.450773 0.59043 0.01738 0.07609 0.00106 471 11 473 6
YQ26-18 74.5 99.43 228.72 0.434724 0.59272 0.02078 0.0757 0.0011 473 13 470 8
YQ26-19 183.06 185.8 569.35 0.326337 0.59332 0.01685 0.07564 0.00105 473 11 470 7
YQ26-20 356.68 356.57 1123.11 0.317484 0.58925 0.01574 0.0748 0.00102 470 10 465 6
YQ26-23 217.12 193.73 658.43 0.29423 0.61345 0.01753 0.07794 0.00108 486 11 484 7
YQ26-25 463.24 894.24 1423.65 0.628132 0.60658 0.01655 0.07363 0.00101 481 10 458 6
YQ26-26 520.94 531.67 1627.18 0.326743 0.59405 0.01609 0.0755 0.00104 473 10 469 6
YQ26-29 220.59 259.59 691.87 0.375201 0.60449 0.01807 0.07442 0.00105 480 11 463 7
YQ26-30 120.08 138.68 370.14 0.374669 0.59275 0.01869 0.07585 0.00108 473 12 471 8
YQ27-01 277.17 707.82 811.08 0.872688 0.61932 0.01849 0.0758 0.00107 489 12 471 6
YQ27-08 149.06 357.85 434.99 0.822663 0.62553 0.02214 0.07662 0.00114 493 14 476 7
YQ27-09 315.23 543.76 953.58 0.57023 0.6029 0.01806 0.0757 0.00107 479 11 470 6
YQ27-13 449.02 761.88 1358.94 0.560643 0.61181 0.01854 0.07622 0.00108 485 12 474 6
YQ27-15 433.07 388.6 1324.27 0.293445 0.63639 0.01904 0.07651 0.00108 500 12 475 6
YQ27-20 328.92 674.83 927.05 0.727933 0.8584 0.02702 0.07641 0.0011 600 23 472 7
YQ27-21 464.38 430.83 1386.2 0.310799 0.69787 0.02237 0.07692 0.00111 485 17 473 7
YQ27-23 261.69 421.98 771.49 0.546968 0.70849 0.02546 0.07703 0.00116 520 21 476 7
YQ27-28 351.86 701.52 939.58 0.746631 0.9806 0.03287 0.07809 0.00116 569 28 473 7
表2 中祁连西段花岗岩类的地球化学成分(主量元素：质量百分含量,%,微量与稀土元素：×10 -6)
Table.2 The geochemical composition of the western section of the Central Qilian granitoid rock（Major element: weight, %; Trace and REE element:×10 -6)
样号 YQ-6 YQ-9 YQ-10 YQ-11 YQ-26 YQ-27
元素 闪长岩 辉长岩 正长花岗岩 花岗闪长岩 花岗闪长岩 花岗岩
SiO2 53.2 51.56 61.67 66.11 67.13 70.73
Al2O3 16.97 17.4 16.97 15.58 16.42 15.86
TiO2 2 1.98 0.92 0.8 0.45 0.31
TFe2O3 11.58 12.09 6.32 5.14 3.39 2.31
MnO 0.19 0.21 0.09 0.08 0.06 0.04
MgO 3.32 3.16 1.36 1.09 2.34 1.17
Ca0 6.01 6.35 4.08 2.91 4.61 2.97
Na2O 4.31 4.22 4.26 3.91 4.01 4.67
K2O 1.83 1.99 4.02 4.1 1.53 1.85
P2O5 0.61 1.04 0.3 0.29 0.06 0.08
Mg# 36.21 34.1 29.83 29.69 57.77 50.11
Li 12.2 15.96 34.24 30.5 35.16 25.46
Sc 24.14 26.2 11.87 9.59 9.38 4.55
Ti 12125.8 14806 5504.08 5414 2834.8 1910.57
V 192.9 135.58 95.01 59.68 90.26 56.19
Cr 22.22 55.34 5.71 5.22 21.58 8.38
Co 23.12 25.72 10.01 8.57 11.89 5.56
Ni 15.55 36.98 6.04 7.39 14.51 5.63
Cu 34.68 42.78 23.55 18.52 20.28 1.57
Zn 119.26 136.86 77.71 66.96 36.48 41.72
Ga 27.26 29.94 22.65 21.16 16.57 16.61
Rb 71.24 86.76 174.1 175.24 57.24 61.1
Sr 272.2 311 175.44 173.24 399.6 386.57
Zr 332.4 499.14 444.9 328.14 54.46 106.04
Nb 21.44 29.61 16.44 20.02 4.56 7.08
Cs 2.38 1.84 6.89 6.22 3.28 2.77
Ba 490.8 625.4 738.19 641 453 418.88
Hf 8.28 9.42 11.82 7.1 1.33 2.61
Ta 1.04 1.8 0.99 1.63 0.36 0.49
Pb 8.41 6.52 17.19 16.32 11.66 14.58
Th 3.84 1.76 13.7 11.74 5.85 6.99
U 0.89 0.98 1.99 1.76 1.14 1.39
La 32.12 33.34 38.41 31.9 8 22.02
Ce 73.86 84.54 77.94 64.7 15.64 37.63
Pr 10.2 11.34 9.62 7.6 1.99 3.89
Nd 42.82 51.18 36.57 30.14 7.72 12.37
Sm 10.29 12.59 7.95 6.54 2.13 1.88
Eu 2.76 3.3 1.65 1.34 0.53 0.64
Gd 11.27 13.6 8.12 6.63 2.25 1.47
Tb 1.76 2.14 1.24 1.04 0.35 0.18
Dy 11.03 13.24 7.78 6.39 2.11 0.96
Ho 2.21 2.67 1.54 1.3 0.39 0.17
Er 6.37 7.57 4.48 3.76 1.1 0.5
Tm 0.98 1.05 0.69 0.54 0.16 0.07
Yb 5.99 6.72 4.31 3.54 1 0.46
Lu 0.89 0.99 0.64 0.53 0.14 0.07
Y 74.36 66.16 53.38 32.5 13.75 6.3
∑REE 286.9 310.43 254.34 198.43 57.24 88.62
LREE 172.05 196.28 172.14 142.22 36 78.44
HREE 114.85 114.15 82.2 56.2 21.24 10.18
δEu 0.78 0.77 0.63 0.62 0.74 1.18
δCe 1 1.07 0.99 1.02 0.96 1
La/Sm 3.12 2.65 4.83 4.88 3.76 11.74
Sm/Nd 0.24 0.25 0.22 0.22 0.28 0.15
(La/Yb)N 3.85 3.56 6.39 6.47 5.76 34.19
图2 选择的部分锆石阴极发光（CL）影像图
Fig.2 Zircon cathodoluminescence (CL) images
图3 样品YQ-6,YQ-10,YQ-11,YQ-26,YQ-27 LA-ICP-MS锆石U-Pb年龄谐和图
Fig. 3 YQ-10,YQ-11,YQ-26,YQ-27 LA-ICP-MS U-Pb zircon concordia diagram
图4 石板墩地区中酸性岩SiO 2-Na 2O+K 2O图解 [ 70 ]
Fig. 4. SiO 2-Na 2O+K 2O(TAS) diagram foracid-intermediate rock [ 70 ]
图5 岩石SiO 2-K 2O图解 [ 71 ]
Fig.5 SiO 2-K 2O diagram of rocks [ 71 ]
图6 花岗岩类A/NK-A/CNK图解 [ 72 ]
Fig.6 Diagrams of A/NK-A/CNK [ 72 ]
图7 石板墩地区花岗岩类微量元素蛛网图及稀土元素配分图 [ 73 ]
Fig.7. Primary mantle-normalized trace element spider diagram and chondrite-normalized REE patterns for acgranitoid rock [ 73 ]
图8 花岗岩类构造环境判别图解 [ 74 ]
Fig. 8 Discrimination diagrams of tectonic setting of granitoid [ 74 ]
图9 花岗岩Sr/Y-Y和(La/Yb) N-Yb N图解 [ 77 , 81 ] Sr/Y-Y中1:榴辉岩（石榴石/辉石=50/50）; 2:角闪石榴岩（石榴石/角闪石=50/50）;3:角闪榴辉岩（角闪石/石榴石/辉石=10/40/50）;4:石榴角闪岩（石榴石/角闪石=10/90）
Fig.9 Plot of Sr/Y versus Y and (La/Yb) N versus Yb N diagrams [ 77 , 81 ] In Sr/Y,1: eclogite(garnet/pyroxene=50/50);2: hornblende garnet rock（garnet/homblende）=50/50);3: amphibole eclogite (homblende/garnet/pyroxene=10/40/50);4: garnet amphibolite(garnet/homblende=10/90)
图10
Fig.10 SiO 2-MgO diagram for acid-intermediate rock [ 82 ] Adakite in the east of China and the Pacific rim accorded reference [ 83 ]
图11 北祁连大洋构造演化模式简图（据参考文献[ 88 ]修改）
Fig.11 Tectonic evolution model of North Qilian ocean（Modified according to [ 88 ]）
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