Geological Record of Tectono-Thermal Event at Early Paleozoic and Its Tectonic Setting in West Segment of the North Qaidam
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摘要: 柴北缘前寒武纪基底岩系发育、岩浆活动频繁，对它们进行年代学研究与对比是探索区域构造过程与成因联系的有效手段.对达肯大坂岩群西段条带状混合片麻岩、黑云斜长片麻岩、二云斜长石英片岩及侵入其中的片麻状石英闪长岩进行了物质组成及变质－变形特征研究.LA-ICP-MS锆石U-Pb同位素年代学测试均获得了达肯大坂岩群约460 Ma和约430 Ma两组峰值年龄信息.结合区域构造演化，认为约460 Ma的次峰值年龄是柴北缘早古生代大陆深俯冲过程中构造－岩浆事件的地质记录；而约430 Ma变质作用时代与片麻状石英闪长岩的结晶年龄(429.0±4.1 Ma)基本一致，结合片麻状石英闪长岩地球化学及达肯大坂岩群锆石稀土元素特征，认为该期变质作用为同期岩浆事件导致的构造－热事件的响应.片麻状石英闪长岩具有明显亏损Nb-Ta、Zr-Hf等高场强元素，富集Pb，指示了与板块俯冲作用相关的造山岩浆作用特征.该研究可为进一步揭示欧龙布鲁克地块西段早古生代构造－热事件的性质提供重要信息.Abstract: It is a valid approach to explore the tectonic evolution and origin by comparative chronological research of the rocks in the northern margin of Qaidam basin characterized by outcropped basement rocks and frequent magmatic activities. Dakendaban Rock Group (DRG) is one of the dominant crystal basement rocks of Oulongbuluke block. A study was carried out on material composition, deformation and metamorphism of the banded migmatitic gneiss, biotite plagioclase gneiss, two-mica plagioclase quartz schist sampled from the DRG, and the gneissic quartz diorite that intruded the DRG. The zircons from DRG samples yield nearly unanimous two peak age of about 460 Ma and peak age of about 430 Ma by LA-ICP-MS zircon U-Pb isotopic analyses. Combined with the regional tectonic processes, we maintain that the age of about 460 Ma is the geological response to the tectono-magmatism caused by ultradeep continental subduction in the North Qaidam. The metamorphic age about 430 Ma is consistent with the crystallization age (429.0±4.1 Ma) of the gneissic quartz diorite. Combined the chronolgical data with geochronological analyses on the gneissic quartz diorite, and the zircon REE data from DRG samples, it proves that the metamorphism of about 430 Ma is closely related to the homochronous tectono-thermal event. The obvious depletion of HFSE, including Nb, Ta, Zr, Hf, and the Pb enrichment demonstrate that the characteristics of the gneissic quartz diorite are related to the plate subduction which formed the active continental margin. This study provides important information for further revealing the tectonic properties and the evolution of the tectono-thermal event at Early Paleozoic in western Oulongbuluke bolck.
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图 1 欧龙布鲁克地块西段地质略图
① 边界断裂；② 主要断裂；③ 基底岩系出露区；④ 研究区位置；1.达肯大坂岩群混合片麻岩岩段；2.达肯大坂岩群条带状片麻岩岩段；3.达肯大坂岩群片岩岩带；4.中元古代石英闪长质片麻岩；5.早志留世片麻状石英闪长岩；6.早二叠世花岗闪长岩；7.晚二叠世二长花岗岩；8.花岗岩脉；9.第四系；10.断层；11.采样位置及编号
Fig. 1. The sketch of western Oulongbuluke block
图 2 条带状混合片麻岩(a)、黑云斜长片麻岩(b)、二云母斜长石英片岩(c)和片麻状石英闪长岩(d)显微照片(+)
Bt.黑云母；Pl.斜长石；Qtz.石英；Am.角闪石；Ms.白云母
Fig. 2. The micrographs of banded-migmatitic gneiss (a), biotite plagioclase gneiss (b) from DRG, two-mica plagioclase quartz schist (c) from DRG and gneissic quartz diorite (d) (+)
图 3 条带状混合片麻岩(PM014-1) 锆石谐和年龄和频谱
Fig. 3. The concordia diagram and the histogram of zircons from banded migmatitic gneiss (PM014-1)
图 4 条带状混合片麻岩(PM014-1) 锆石CL图像
Fig. 4. The CL images of zircons from banded migmatitic gneiss (PM014-1)
图 5 黑云斜长混合片麻岩(PM014-Z)锆石U-Pb年龄谐和图和频谱
Fig. 5. The concordia diagram and the histogram of zircons from biotite plagioclase gneiss (PM014-Z)
图 6 黑云斜长混合片麻岩(PM014-Z)锆石CL图像
Fig. 6. The CL images of zircons from biotite plagioclase gneiss (PM014-Z)
图 7 达肯大坂岩群二云斜长石英片岩(PM014-39) 锆石年龄谐和图和频谱
Fig. 7. Concordia diagram and the histogram of zircons from two-mica plagioclase quartz schist (PM014-39)
图 8 达肯大坂岩群二云斜长石英片岩(PM014-39) 锆石CL图像
Fig. 8. The CL images of zircons from two-mica plagioclase quartz schist (PM014-39)
图 9 达肯大坂岩群中不同岩性中约430 Ma(a, c, e)和约460 Ma(b, d, f)锆石稀土元素配分模式对比
球粒陨石标准化数值据Sun and McDonough(1989)
Fig. 9. Chondrite-normalized REE patterns of the zircons samples with about 430 Ma (a, c, e) and about 460 Ma (b, d, f) from DRG
图 10 片麻状石英闪长岩(PM014-13) 锆石CL图像
Fig. 10. The CL images of the zircons from gneissic quartz diorite (PM014-13)
图 11 片麻状石英闪长岩(PM014-13) 锆石谐和年龄
Fig. 11. The concordia diagram of the zircons from gneissic quartz diorite (PM014-13)
图 12 片麻状石英闪长岩稀土元素球粒陨石标准化配分图解与微量元素原始地幔标准化蛛网图
标准化数值据Sun and McDonough(1989)
Fig. 12. Chondrite-normalized REE patterns and primitive-mantle normalized spidergram for gneissic quartz diorite
表 1 达肯大坂岩群条带状黑云混合片麻岩(PM014-1) LA-ICP-MS锆石U-Pb同位素测试结果
Table 1. LA-ICP-MS zircon U-Pb isotopic analysis of banded migmatitic gneiss (PM014-1) of the DRG
测点 同位素比值 同位素年龄(Ma) 含量(10-6) Th/U 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th 比值 1σ 比值 1σ 比值 1σ 比值 1σ 年龄 1σ 年龄 1σ 年龄 1σ 年龄 1σ Th U Pb PM014-1-04 0.056 9 0.001 3 0.531 0.008 0.067 6 0.000 7 0.020 5 0.000 3 487 50 432 5 422 4 409 6 317.0 1 581.5 100.6 0.20 PM014-1-05 0.057 4 0.001 4 0.554 0.009 0.070 1 0.000 8 0.024 4 0.000 3 506 52 448 6 436 5 487 7 166.0 759.3 53.6 0.22 PM014-1-06 0.055 8 0.001 3 0.535 0.008 0.069 6 0.000 7 0.022 0 0.000 4 442 50 435 5 434 4 440 8 71.5 733.5 49.2 0.10 PM014-1-07 0.055 7 0.001 3 0.530 0.008 0.069 0 0.000 7 0.020 4 0.000 3 439 51 432 6 430 4 408 6 108.5 595.2 40.6 0.18 PM014-1-08 0.058 1 0.001 3 0.556 0.008 0.069 3 0.000 7 0.022 7 0.000 3 534 48 449 5 432 4 453 6 177.7 1 068.2 73.5 0.17 PM014-1-13 0.055 9 0.001 3 0.561 0.008 0.072 8 0.000 8 0.021 7 0.000 3 446 49 452 5 453 5 433 6 253.8 1 230.1 85.8 0.21 PM014-1-17 0.059 3 0.001 4 0.576 0.009 0.070 4 0.000 8 0.025 1 0.000 4 579 51 462 6 439 5 501 7 108.2 624.4 44.3 0.17 PM014-1-19 0.055 8 0.001 5 0.522 0.010 0.067 9 0.000 8 0.025 7 0.000 8 444 56 427 7 424 5 512 16 23.8 487.3 30.2 0.05 PM014-1-20 0.059 8 0.001 5 0.572 0.010 0.069 4 0.000 8 0.022 7 0.000 4 596 52 460 6 433 5 454 8 134.7 879.5 60.1 0.15 PM014-1-21 0.056 1 0.001 4 0.503 0.009 0.065 0 0.000 7 0.017 0 0.000 3 457 54 414 6 406 4 340 7 109.4 724.8 45.6 0.15 PM014-1-25 0.056 6 0.001 2 0.540 0.007 0.069 2 0.000 7 0.022 4 0.000 3 474 47 439 4 432 4 447 5 294.7 1 610.1 110.1 0.18 PM014-1-27 0.059 4 0.001 4 0.593 0.010 0.072 3 0.000 8 0.027 8 0.000 5 583 51 473 6 450 5 554 9 144.8 970.4 67.5 0.15 PM014-1-28 0.058 4 0.001 3 0.565 0.007 0.070 2 0.000 8 0.023 9 0.000 3 543 46 455 5 437 5 477 6 240.8 1 238.9 86.6 0.19 PM014-1-29 0.054 9 0.001 2 0.557 0.008 0.073 6 0.000 8 0.022 7 0.000 3 406 48 449 5 458 5 454 6 261.9 1 532.5 107.5 0.17 PM014-1-31 0.055 8 0.001 3 0.527 0.008 0.068 5 0.000 8 0.020 2 0.000 3 443 51 430 6 427 5 404 7 147.1 814.2 53.3 0.18 PM014-1-32 0.063 3 0.001 6 0.672 0.012 0.077 0 0.000 9 0.017 1 0.000 2 720 52 522 7 478 5 342 4 1 862.4 1 595.3 128.1 1.17 PM014-1-33 0.058 2 0.001 3 0.560 0.007 0.069 8 0.000 8 0.023 5 0.000 3 535 47 451 5 435 5 469 6 334.3 2 032.6 137.9 0.16 PM014-1-34 0.057 1 0.001 5 0.640 0.013 0.081 3 0.000 9 0.024 4 0.000 4 495 58 502 8 504 6 487 8 75.9 312.5 24.1 0.24 PM014-1-35 0.085 4 0.001 8 2.643 0.033 0.224 6 0.002 4 0.067 1 0.000 7 1 324 40 1 313 9 1 306 13 1 312 13 316.3 434.0 114.8 0.73 PM014-1-36 0.055 7 0.001 2 0.568 0.008 0.074 0 0.000 8 0.024 0 0.000 3 440 47 457 5 460 5 479 6 175.6 1 269.8 91.0 0.14 PM014-1-37 0.063 9 0.001 6 0.656 0.012 0.074 5 0.000 9 0.034 1 0.000 6 738 53 512 8 463 5 677 12 102.5 754.4 55.9 0.14 PM014-1-40 0.062 4 0.001 4 0.657 0.009 0.076 4 0.000 8 0.018 7 0.000 2 687 46 513 5 474 5 374 4 794.9 1 444.9 117.5 0.55 PM014-1-41 0.055 1 0.001 2 0.562 0.007 0.073 9 0.000 8 0.023 2 0.000 3 418 46 453 5 459 5 463 6 234.0 1 412.4 101.5 0.17 PM014-1-42 0.055 6 0.001 2 0.528 0.008 0.068 9 0.000 8 0.022 5 0.000 3 437 49 431 5 429 5 451 6 160.4 955.7 64.2 0.17 PM014-1-43 0.063 1 0.001 4 0.644 0.010 0.074 0 0.000 8 0.035 5 0.000 5 712 47 505 6 460 5 704 9 158.8 778.8 59.2 0.20 PM014-1-44 0.058 0 0.001 5 0.655 0.013 0.081 9 0.000 9 0.037 6 0.000 8 531 56 512 8 507 6 745 15 50.1 493.0 39.1 0.10 PM014-1-45 0.057 2 0.001 2 0.574 0.007 0.072 9 0.000 8 0.025 9 0.000 3 497 46 461 5 454 5 518 6 386.2 1 881.7 136.5 0.21 PM014-1-46 0.055 3 0.001 2 0.564 0.008 0.074 0 0.000 8 0.025 5 0.000 4 426 48 454 5 460 5 510 7 132.6 1 017.3 72.5 0.13 PM014-1-47 0.056 0 0.001 2 0.537 0.008 0.069 6 0.000 8 0.024 0 0.000 4 452 48 436 5 434 5 480 8 91.8 1 188.5 78.2 0.08 PM014-1-48 0.060 3 0.001 4 0.608 0.010 0.073 2 0.000 8 0.025 1 0.000 3 614 50 482 6 455 5 501 6 341.2 926.2 67.5 0.37 PM014-1-50 0.057 9 0.001 5 0.556 0.011 0.069 8 0.000 8 0.022 8 0.000 4 524 58 449 7 435 5 455 8 74.6 295.7 20.7 0.25 PM014-1-51 0.054 5 0.001 4 0.521 0.010 0.069 3 0.000 8 0.020 3 0.000 3 392 56 426 7 432 5 406 7 102.5 379.7 26.2 0.27 PM014-1-52 0.056 2 0.001 2 0.535 0.007 0.069 1 0.000 8 0.021 7 0.000 3 459 46 435 5 431 5 434 5 312.9 1 579.6 107.0 0.20 PM014-1-53 0.057 9 0.001 3 0.515 0.008 0.064 6 0.000 7 0.020 2 0.000 3 525 49 422 5 403 4 405 6 131.0 712.0 44.9 0.18 PM014-1-54 0.057 4 0.001 3 0.588 0.009 0.074 4 0.000 8 0.028 3 0.000 4 504 51 470 6 463 5 563 8 136.8 650.7 48.3 0.21 PM014-1-55 0.055 8 0.001 2 0.535 0.007 0.069 5 0.000 8 0.021 9 0.000 3 445 47 435 5 433 5 438 5 282.2 1 033.2 71.9 0.27 PM014-1-56 0.055 9 0.001 3 0.530 0.009 0.068 8 0.000 8 0.022 2 0.000 4 447 52 432 6 429 5 444 7 162.4 928.4 61.7 0.17 
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表 2 达肯大坂岩群黑云斜长混合片麻岩(PM014-Z)LA-ICP-MS锆石U -Pb同位素测试结果
Table 2. LA-ICP-MS zircon U-Pb isotopic analysis of biotite plagioclase gneiss (PM014-Z) of the DRG
测点 同位素比值 同位素年龄(Ma) 含量(10-6) Th/U 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th 比值 1σ 比值 1σ 比值 1σ 比值 1σ 年龄 1σ 年龄 1σ 年龄 1σ 年龄 1σ Th U Pb PM014-Z-01 0.054 9 0.001 3 0.561 0.010 0.074 2 0.000 8 0.023 1 0.000 3 406 52 452 6 461 5 462 5 488.3 656.3 105.8 0.74 PM014-Z-03 0.091 9 0.002 2 3.053 0.052 0.2409 0.002 9 0.068 5 0.000 8 1 466 45 1421 13 1391 15 1 338 15 142.0 93.1 306.6 1.53 PM014-Z-04 0.053 7 0.001 3 0.548 0.010 0.074 0 0.000 8 0.026 7 0.000 3 357 55 444 6 461 5 533 6 350.8 708.4 122.2 0.50 PM014-Z-05 0.060 0 0.001 3 0.607 0.008 0.073 3 0.000 8 0.024 2 0.000 3 603 46 482 5 456 5 484 5 367.1 1 074.5 110.8 0.34 PM014-Z-06 0.056 9 0.001 3 0.544 0.009 0.069 3 0.000 8 0.024 2 0.000 3 486 50 441 6 432 5 483 6 184.7 715.7 111.0 0.26 PM014-Z-10 0.149 9 0.003 4 8.286 0.126 0.401 0 0.004 9 0.109 1 0.001 5 2 344 38 2 263 14 2 174 23 2 093 27 97.3 118.4 481.4 0.82 PM014-Z-11 0.056 7 0.001 2 0.544 0.008 0.069 6 0.000 8 0.021 2 0.000 2 481 48 441 5 434 5 423 4 520.2 846.3 96.8 0.61 PM014-Z-13 0.069 3 0.001 7 1.534 0.026 0.160 5 0.001 9 0.047 5 0.000 5 908 48 944 10 960 10 937 10 278.6 222.0 214.6 1.26 PM014-Z-14 0.056 9 0.001 3 0.585 0.009 0.074 6 0.000 8 0.023 4 0.000 3 486 50 468 6 464 5 467 5 316.3 583.0 106.9 0.54 PM014-Z-15 0.054 8 0.001 4 0.460 0.009 0.060 9 0.000 7 0.020 6 0.000 8 403 55 384 6 381 4 412 17 14.3 516.7 100.6 0.03 PM014-Z-16 0.059 9 0.001 4 0.913 0.014 0.110 5 0.001 2 0.034 4 0.000 5 600 49 659 7 676 7 683 10 133.3 597.2 157.6 0.22 PM014-Z-17 0.056 9 0.001 4 0.535 0.009 0.068 2 0.000 8 0.019 7 0.000 2 488 53 435 6 425 5 394 4 806.9 796.7 90.3 1.01 PM014-Z-18 0.056 8 0.001 5 0.473 0.009 0.060 4 0.000 7 0.021 2 0.000 3 482 57 393 7 378 4 423 7 147.8 519.6 98.0 0.28 PM014-Z-19 0.057 2 0.001 9 0.581 0.017 0.073 6 0.001 0 0.024 8 0.000 4 500 73 465 11 458 6 496 8 201.3 251.7 114.8 0.80 PM014-Z-20 0.068 8 0.001 8 1.576 0.032 0.166 2 0.002 0 0.050 3 0.000 9 892 54 961 13 991 11 993 17 47.1 124.3 230.5 0.38 PM014-Z-21 0.055 1 0.001 3 0.522 0.008 0.068 7 0.000 8 0.021 0 0.000 2 415 49 426 5 429 5 419 5 287.8 541.2 96.1 0.53 PM014-Z-22 0.130 1 0.003 3 7.129 0.135 0.397 4 0.005 4 0.119 9 0.002 4 2 099 43 2 128 17 2 157 25 2 289 44 25.0 60.8 534.0 0.41 PM014-Z-23 0.070 9 0.001 8 1.598 0.031 0.163 4 0.002 0 0.052 4 0.000 8 955 52 969 12 976 11 1 032 16 58.3 152.1 238.7 0.38 PM014-Z-24 0.113 2 0.002 6 5.471 0.087 0.350 4 0.004 3 0.102 8 0.001 4 1 852 41 1 896 14 1 937 20 1 977 26 63.5 99.4 454.8 0.64 PM014-Z-25 0.055 0 0.001 3 0.528 0.009 0.069 6 0.000 8 0.021 5 0.000 2 413 51 431 6 434 5 429 5 461.0 613.3 98.3 0.75 PM014-Z-26 0.054 9 0.001 2 0.525 0.007 0.069 3 0.000 8 0.020 6 0.000 2 409 48 428 5 432 5 413 4 741.1 1 094.6 94.4 0.68 PM014-Z-27 0.069 6 0.001 5 1.507 0.020 0.157 0 0.001 7 0.049 4 0.000 6 918 43 933 8 940 10 975 11 265.7 726.7 223.2 0.37 PM014-Z-28 0.054 4 0.001 3 0.556 0.010 0.074 0 0.000 8 0.022 8 0.000 3 389 54 449 6 460 5 455 6 230.0 575.4 104.7 0.40 PM014-Z-29 0.169 3 0.003 5 11.238 0.142 0.481 4 0.005 5 0.133 8 0.001 6 2 551 35 2 543 12 2 533 24 2 538 29 92.2 173.5 581.2 0.53 PM014-Z-31 0.087 6 0.002 7 2.991 0.077 0.247 5 0.003 5 0.078 5 0.001 9 1 374 58 1 405 20 1 426 18 1 527 35 48.3 142.8 359.6 0.34 PM014-Z-33 0.056 5 0.001 2 0.489 0.007 0.062 8 0.000 7 0.021 9 0.000 3 470 48 404 5 392 4 437 6 259.0 1461.4 100.4 0.18 PM014-Z-35 0.069 8 0.001 5 1.551 0.019 0.161 3 0.001 8 0.048 4 0.000 6 921 42 951 8 964 10 955 11 175.2 837.6 218.9 0.21 PM014-Z-36 0.055 7 0.001 3 0.576 0.008 0.075 0 0.000 8 0.023 4 0.000 3 441 49 462 5 466 5 468 5 401.4 915.7 107.2 0.44 PM014-Z-39 0.056 0 0.001 7 0.531 0.013 0.068 8 0.000 8 0.021 4 0.000 4 451 65 433 9 429 5 428 8 94.9 241.7 99.7 0.39 PM014-Z-40 0.055 9 0.001 3 0.534 0.008 0.069 4 0.000 8 0.022 2 0.000 2 448 50 435 5 432 5 444 5 580.9 736.2 101.6 0.79 PM014-Z-41 0.055 6 0.001 2 0.535 0.007 0.069 8 0.000 8 0.022 2 0.000 3 435 47 435 5 435 5 443 5 459.6 1282.7 101.5 0.36 PM014-Z-42 0.056 3 0.001 2 0.542 0.007 0.069 7 0.000 8 0.021 4 0.000 3 465 48 440 5 435 5 428 6 191.9 1257.0 98.5 0.15 PM014-Z-43 0.055 6 0.001 3 0.533 0.008 0.069 5 0.000 8 0.022 0 0.000 2 437 49 434 5 433 5 440 5 538.3 814.7 100.6 0.66 PM014-Z-44 0.055 1 0.002 2 0.567 0.020 0.074 6 0.001 0 0.023 2 0.000 5 417 85 456 13 464 6 463 9 76.4 103.9 108.3 0.74 PM014-Z-46 0.055 8 0.001 6 0.539 0.012 0.070 1 0.000 8 0.021 8 0.000 4 444 61 438 8 437 5 436 9 80.4 342.0 101.9 0.24 PM014-Z-47 0.077 6 0.001 9 2.060 0.036 0.192 5 0.002 3 0.059 0 0.000 8 1 137 48 1 136 12 1 135 12 1 158 15 79.2 128.3 266.6 0.62 PM014-Z-48 0.069 6 0.001 7 1.237 0.022 0.129 0 0.001 5 0.045 2 0.000 5 916 49 818 10 782 9 894 9 472.8 288.2 204.3 1.64 PM014-Z-49 0.056 9 0.001 3 0.543 0.009 0.069 3 0.000 8 0.022 6 0.000 3 485 51 441 6 432 5 451 5 259.6 607.4 103.4 0.43 PM014-Z-51 0.056 8 0.001 4 0.544 0.010 0.069 5 0.000 8 0.022 6 0.000 3 481 54 441 6 433 5 451 6 288.7 642.3 103.8 0.45 PM014-Z-52 0.062 0 0.001 6 0.648 0.012 0.075 9 0.000 9 0.024 5 0.000 3 673 53 507 7 471 5 490 6 294.6 404.1 112.5 0.73 PM014-Z-53 0.065 0 0.001 5 1.245 0.020 0.139 1 0.001 6 0.043 3 0.000 6 773 49 821 9 839 9 856 11 120.2 253.8 196.7 0.47 PM014-Z-54 0.055 3 0.001 2 0.572 0.008 0.075 1 0.000 8 0.021 6 0.000 3 423 49 460 5 467 5 431 5 345.3 1 096.9 99.1 0.31 PM014-Z-55 0.123 4 0.002 6 6.495 0.079 0.381 9 0.004 2 0.123 8 0.001 7 2 005 37 2 045 11 2 085 20 2 359 31 46.2 318.6 541.7 0.15 PM014-Z-56 0.061 4 0.001 5 0.588 0.010 0.069 4 0.000 8 0.023 9 0.000 3 655 51 469 6 432 5 477 6 384.1 681.8 109.4 0.56
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表 3 达肯大坂岩群二云斜长石英片岩(PM014-39) LA-ICP-MS锆石U -Pb同位素测试结果
Table 3. LA-ICP-MS zircon U-Pb isotopic analysis of two -mica plagioclase quartz schist (PM014-39) of the DRG
测点 同位素比值 同位素年龄(Ma) 含量(10-6) Th/U 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th 比值 1σ 比值 1σ 比值 1σ 比值 1σ 年龄 1σ 年龄 1σ 年龄 1σ 年龄 1σ Th U Pb PM014-39-01 0.055 7 0.001 3 0.525 0.009 0.068 5 0.000 8 0.020 7 0.000 2 438 52 429 6 427 5 414 5 295.9 460.7 94.9 0.64 PM014-39-02 0.057 4 0.001 9 0.593 0.016 0.0750 0.000 9 0.023 4 0.000 4 507 70 473 10 466 6 468 9 86.3 197.5 109.1 0.44 PM014-39-04 0.066 4 0.001 8 1.010 0.021 0.110 4 0.001 3 0.036 2 0.000 5 818 56 709 11 675 8 719 9 254.3 351.0 165.2 0.72 PM014-39-05 0.054 6 0.001 2 0.509 0.007 0.067 6 0.000 7 0.017 2 0.000 2 396 48 418 5 422 4 345 4 520.0 1342.0 79.2 0.39 PM014-39-06 0.056 1 0.002 1 0.574 0.019 0.074 2 0.001 0 0.022 3 0.000 4 456 80 461 12 462 6 447 8 316.7 405.4 103.9 0.78 PM014-39-08 0.059 1 0.001 4 0.593 0.009 0.072 9 0.000 8 0.022 9 0.000 2 570 50 473 6 453 5 457 5 440.3 595.7 104.4 0.74 PM014-39-09 0.055 4 0.001 2 0.532 0.007 0.069 7 0.000 8 0.021 2 0.000 2 428 47 433 5 434 5 423 5 414.4 1 179.7 96.9 0.35 PM014-39-10 0.055 0 0.001 4 0.564 0.011 0.074 5 0.000 8 0.022 0 0.000 3 411 55 454 7 463 5 441 5 296.4 447.0 101.2 0.66 PM014-39-11 0.056 1 0.001 8 0.589 0.016 0.076 2 0.000 9 0.023 3 0.000 4 454 69 470 10 473 6 466 8 83.5 142.9 108.2 0.58 PM014-39-12 0.066 1 0.001 7 1.201 0.022 0.131 8 0.001 5 0.036 5 0.000 6 810 52 801 10 798 9 724 11 160.3 433.9 167.5 0.37 PM014-39-13 0.054 9 0.001 6 0.524 0.012 0.069 3 0.000 8 0.021 3 0.000 3 407 63 428 8 432 5 426 6 146.0 242.8 98.4 0.60 PM014-39-14 0.067 3 0.001 6 1.409 0.024 0.151 9 0.001 7 0.044 5 0.000 5 847 49 893 10 912 10 880 10 161.1 192.3 201.7 0.84 PM014-39-15 0.056 1 0.001 2 0.562 0.008 0.072 6 0.000 8 0.022 4 0.000 2 458 48 453 5 452 5 448 5 449.0 1 047.3 102.3 0.43 PM014-39-16 0.055 6 0.001 2 0.533 0.007 0.069 5 0.000 8 0.021 2 0.000 2 434 47 434 5 433 5 424 5 421.3 1 458.0 97.2 0.29 PM014-39-17 0.055 5 0.001 3 0.560 0.009 0.073 2 0.000 8 0.023 0 0.000 3 433 52 451 6 455 5 460 5 271.9 628.5 105.6 0.43 PM014-39-18 0.055 8 0.001 2 0.525 0.007 0.068 3 0.000 7 0.021 7 0.000 2 443 47 429 5 426 4 433 5 389.7 1 916.2 99.1 0.20 PM014-39-19 0.056 4 0.001 4 0.535 0.009 0.068 9 0.000 8 0.021 9 0.000 3 466 53 435 6 430 5 439 5 251.5 655.8 100.8 0.38 PM014-39-20 0.055 6 0.001 3 0.526 0.009 0.068 7 0.000 8 0.020 6 0.000 2 437 52 429 6 428 5 412 4 405.9 542.9 94.3 0.75 PM014-39-21 0.055 0 0.001 3 0.531 0.008 0.070 1 0.000 8 0.021 3 0.000 2 412 50 433 5 437 5 427 5 464.6 700.3 97.7 0.66 PM014-39-22 0.096 2 0.002 1 3.542 0.051 0.267 3 0.003 0 0.077 8 0.000 9 1 551 41 1 537 11 1 527 15 1 514 17 111.9 201.3 346.9 0.56 PM014-39-23 0.056 3 0.001 5 0.581 0.011 0.074 9 0.000 9 0.023 7 0.000 3 462 56 465 7 465 5 472 6 159.5 295.0 108.6 0.54 PM014-39-26 0.056 7 0.001 5 0.543 0.010 0.069 6 0.000 8 0.021 4 0.000 3 478 56 441 7 434 5 427 5 254.1 362.0 98.0 0.70 PM014-39-29 0.088 3 0.001 8 2.837 0.031 0.233 1 0.002 5 0.044 1 0.000 4 1 390 38 1 366 8 1 351 13 873 8 709.5 1 660.7 199.8 0.43 PM014-39-30 0.055 1 0.001 2 0.527 0.008 0.069 4 0.000 8 0.021 4 0.000 3 418 49 430 5 433 5 428 5 472.0 1 340.9 98.1 0.35 PM014-39-31 0.055 6 0.001 4 0.535 0.010 0.069 9 0.000 8 0.020 3 0.000 2 435 54 435 6 435 5 407 5 320.8 494.3 93.5 0.65 PM014-39-32 0.058 8 0.001 4 0.566 0.009 0.069 8 0.000 8 0.022 2 0.000 3 559 49 455 6 435 5 443 5 415.7 754.3 101.4 0.55 PM014-39-33 0.056 0 0.001 4 0.538 0.010 0.069 7 0.000 8 0.022 3 0.000 3 452 56 437 7 434 5 445 6 273.6 488.6 102.3 0.56 PM014-39-34 0.059 6 0.002 0 0.620 0.017 0.075 5 0.001 0 0.023 0 0.000 4 589 70 490 11 469 6 459 7 255.4 354.7 106.4 0.72 PM014-39-35 0.058 3 0.001 6 0.609 0.013 0.075 9 0.000 9 0.022 5 0.000 3 539 61 483 9 471 5 450 6 145.0 220.2 103.9 0.66 PM014-39-37 0.056 1 0.001 6 0.535 0.012 0.069 1 0.000 8 0.021 9 0.000 3 457 62 435 8 431 5 438 7 142.9 341.2 101.3 0.42 PM014-39-38 0.058 7 0.001 4 0.520 0.009 0.064 3 0.000 7 0.010 8 0.000 1 556 52 425 6 402 4 217 3 475.1 607.3 50.4 0.78 PM014-39-39 0.058 0 0.001 6 0.595 0.013 0.074 5 0.000 9 0.025 2 0.000 4 529 61 474 8 463 5 502 7 105.9 231.6 115.9 0.46 PM014-39-40 0.055 9 0.001 2 0.535 0.008 0.069 4 0.000 8 0.018 2 0.000 2 447 48 435 5 433 5 365 4 647.5 911.8 83.5 0.71 PM014-39-41 0.057 0 0.001 5 0.548 0.011 0.069 7 0.000 8 0.021 8 0.000 3 491 57 443 7 434 5 435 5 240.2 373.8 100.0 0.64 PM014-39-42 0.061 6 0.001 9 0.590 0.015 0.069 5 0.000 9 0.023 2 0.000 4 660 65 471 10 433 5 464 7 234.9 425.8 107.4 0.55 PM014-39-43 0.059 3 0.001 4 0.570 0.009 0.069 7 0.000 8 0.021 4 0.000 2 580 50 458 6 434 5 428 5 329.5 506.6 98.0 0.65 PM014-39-44 0.055 8 0.001 4 0.531 0.009 0.069 1 0.000 8 0.019 9 0.000 2 444 54 433 6 431 5 399 4 533.8 611.0 91.4 0.87 PM014-39-46 0.056 3 0.001 5 0.535 0.011 0.069 0 0.000 8 0.020 3 0.000 2 462 58 435 7 430 5 407 5 457.6 564.1 93.4 0.81 PM014-39-47 0.057 1 0.001 3 0.549 0.008 0.069 7 0.000 8 0.021 7 0.000 2 495 48 444 5 434 5 434 5 496.3 1 270.8 99.4 0.39 PM014-39-48 0.086 5 0.001 8 2.748 0.032 0.230 7 0.002 5 0.052 4 0.000 5 1 349 39 1 342 9 1 338 13 1 032 10 492.7 899.5 236.1 0.55 PM014-39-49 0.057 9 0.001 4 0.591 0.010 0.074 1 0.000 8 0.022 2 0.000 3 524 52 471 6 461 5 444 5 286.0 428.2 101.7 0.67 PM014-39-50 0.057 8 0.001 5 0.614 0.011 0.077 2 0.000 9 0.025 6 0.000 3 520 54 486 7 479 5 510 6 182.2 415.2 117.2 0.44 PM014-39-51 0.056 2 0.001 6 0.576 0.012 0.074 4 0.000 9 0.024 0 0.000 4 461 61 462 8 462 5 479 8 87.6 266.4 111.1 0.33 PM014-39-53 0.055 7 0.001 3 0.528 0.009 0.068 7 0.000 8 0.021 3 0.000 3 441 52 430 6 429 5 427 5 286.0 658.2 97.9 0.43 PM014-39-54 0.055 7 0.001 3 0.529 0.008 0.069 0 0.000 8 0.020 0 0.000 2 440 50 431 5 430 5 401 4 488.4 998.5 91.9 0.49 PM014-39-55 0.085 7 0.002 8 2.632 0.073 0.222 8 0.003 1 0.068 9 0.001 3 1 332 62 1 310 20 1 297 16 1 347 25 43.2 71.9 314.4 0.60 PM014-39-56 0.060 5 0.002 4 0.586 0.020 0.070 3 0.001 0 0.023 1 0.000 5 622 82 469 13 438 6 461 9 139.7 261.5 107.9 0.53 PM014-39-57 0.055 6 0.001 2 0.522 0.007 0.068 2 0.000 7 0.020 6 0.000 2 435 48 427 5 425 4 412 4 571.5 861.3 94.2 0.66 PM014-39-58 0.055 7 0.001 4 0.536 0.009 0.069 9 0.000 8 0.021 8 0.000 3 440 54 436 6 435 5 435 5 221.9 383.9 99.9 0.58 PM014-39-59 0.056 9 0.001 3 0.574 0.008 0.073 2 0.000 8 0.023 5 0.000 3 488 48 461 5 456 5 470 5 467.7 1 342.0 107.5 0.35 PM014-39-60 0.055 9 0.001 7 0.536 0.013 0.069 6 0.000 8 0.023 0 0.000 4 449 66 436 9 434 5 460 8 110.4 269.0 106.8 0.41 PM014-39-61 0.056 2 0.001 7 0.568 0.014 0.073 5 0.000 9 0.023 4 0.000 4 458 65 457 9 457 5 466 8 105.7 290.4 108.3 0.36 PM014-39-62 0.056 5 0.001 3 0.538 0.008 0.069 0 0.000 8 0.022 0 0.000 3 473 49 437 5 430 5 439 5 542.0 1 468.1 100.6 0.37 PM014-39-63 0.058 0 0.001 9 0.655 0.018 0.081 9 0.001 0 0.026 2 0.000 5 531 70 512 11 507 6 523 9 85.7 176.1 121.7 0.49 PM014-39-64 0.056 6 0.001 6 0.570 0.012 0.073 1 0.000 8 0.023 2 0.000 3 473 60 458 8 455 5 464 6 159.2 290.8 106.9 0.55 PM014-39-65 0.056 8 0.001 3 0.540 0.009 0.069 0 0.000 8 0.021 7 0.000 2 481 51 438 6 430 5 433 5 437.8 706.2 99.1 0.62 PM014-39-66 0.058 3 0.001 6 0.605 0.013 0.075 3 0.000 9 0.024 0 0.000 3 539 59 480 8 468 5 480 6 223.8 379.0 110.4 0.59 PM014-39-67 0.059 7 0.001 5 0.571 0.010 0.069 5 0.000 8 0.022 7 0.000 3 593 52 459 7 433 5 453 6 297.7 856.9 104.1 0.35 PM014-39-68 0.056 4 0.001 6 0.566 0.013 0.072 8 0.000 9 0.023 5 0.000 3 467 63 455 8 453 5 470 7 205.7 354.8 108.4 0.58 PM014-39-69 0.069 7 0.001 6 1.427 0.021 0.148 5 0.001 6 0.044 2 0.000 5 921 46 900 9 893 9 873 9 301.0 345.7 199.7 0.87
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表 4 片麻状石英闪长岩(PM014-13) LA-ICP-MS锆石U -Pb同位素测试结果
Table 4. LA-ICP-MS zircon U-Pb isotopic analysis of gneissic quartz diorite (PM014-Z)
测点 同位素比值 同位素年龄(Ma) 含量(10-6) Th/U 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th 比值 1σ 比值 1σ 比值 1σ 比值 1σ 年龄 1σ 年龄 1σ 年龄 1σ 年龄 1σ Th U Pb P13-01 0.056 2 0.000 8 0.547 0.006 0.070 5 0.000 4 0.021 7 0.000 2 461 14 443 4 439 2 434 3 656.0 1 050.0 310.8 0.62 P13-02 0.057 3 0.001 3 0.554 0.011 0.070 1 0.000 5 0.0213 0.000 3 503 31 448 7 437 3 427 5 364.7 582.1 171.4 0.63 P13-03 0.062 1 0.001 2 0.597 0.011 0.069 8 0.000 4 0.021 5 0.000 1 677 43 475 7 435 3 429 2 319.0 638.0 190.3 0.50 P13-05 0.054 4 0.001 0 0.514 0.008 0.068 6 0.000 4 0.021 6 0.000 2 386 24 421 5 427 3 433 4 208.9 416.5 120.2 0.50 P13-06 0.056 3 0.001 1 0.533 0.010 0.068 6 0.000 5 0.020 6 0.000 2 464 28 434 6 428 3 413 4 179.5 276.4 79.8 0.65 P13-09 0.053 9 0.000 8 0.523 0.006 0.070 4 0.000 4 0.020 3 0.000 2 365 17 427 4 438 3 405 3 503.3 693.6 206.1 0.73 P13-11 0.056 8 0.001 4 0.548 0.013 0.070 0 0.000 5 0.021 7 0.000 1 485 56 444 9 436 3 435 2 350.6 625.1 185.3 0.56 P13-14 0.055 5 0.000 9 0.526 0.007 0.068 8 0.000 4 0.02 13 0.000 2 431 20 429 5 429 3 426 4 221.0 518.7 151.5 0.43 P13-17 0.055 2 0.000 9 0.536 0.007 0.07 4 0.000 4 0.021 8 0.000 2 418 18 436 5 439 3 437 4 241.9 626.9 187.7 0.39 P13-20 0.055 8 0.000 9 0.531 0.008 0.069 1 0.000 4 0.020 4 0.000 2 444 20 433 5 431 3 408 4 250.0 448.0 131.9 0.56 P13-21 0.053 7 0.001 1 0.503 0.009 0.068 0 0.000 5 0.019 4 0.000 2 356 27 414 6 424 3 389 4 228.3 323.8 93.9 0.71 P13-22 0.057 2 0.000 7 0.540 0.005 0.068 5 0.000 4 0.021 2 0.000 1 499 10 438 3 427 2 425 3 701.2 2 284.0 666.8 0.31 P13-23 0.054 9 0.001 0 0.519 0.008 0.068 6 0.000 4 0.019 8 0.000 2 409 22 425 5 428 3 396 3 317.1 443.3 129.8 0.72 P13-25 0.055 6 0.001 1 0.514 0.009 0.067 2 0.000 5 0.021 8 0.000 4 434 28 421 6 419 3 436 8 48.7 294.7 84.7 0.17 P13-27 0.057 8 0.001 3 0.552 0.011 0.069 2 0.000 5 0.021 2 0.000 3 524 32 446 7 431 3 423 5 108.3 185.2 54.9 0.58 P13-29 0.054 7 0.001 1 0.521 0.010 0.069 1 0.000 5 0.019 9 0.000 2 400 30 426 7 431 3 399 3 615.9 447.0 132.5 1.38 P13-31 0.054 3 0.000 9 0.517 0.007 0.069 0 0.000 4 0.020 5 0.000 2 385 20 423 5 430 3 411 3 259.7 486.9 144.4 0.53 P13-33 0.052 6 0.000 7 0.497 0.005 0.068 6 0.000 4 0.019 9 0.000 2 312 14 410 4 428 2 398 3 321.6 844.6 249.2 0.38 P13-34 0.053 0 0.000 8 0.503 0.006 0.069 0 0.000 4 0.019 8 0.000 2 327 18 414 4 430 2 397 3 316.2 729.6 216.6 0.43 P13-35 0.056 0 0.000 7 0.531 0.005 0.068 8 0.000 4 0.020 4 0.000 1 452 13 432 4 429 2 407 3 525.5 870.6 258.0 0.60 P13-38 0.056 2 0.000 9 0.542 0.007 0.070 0 0.000 4 0.024 9 0.000 3 461 19 440 5 436 3 497 5 143.8 559.8 169.3 0.26 P13-39 0.059 6 0.001 0 0.577 0.008 0.070 3 0.000 4 0.021 5 0.000 2 589 20 463 5 438 3 430 4 188.5 382.8 116.4 0.49 P13-40 0.057 8 0.000 8 0.536 0.005 0.067 4 0.000 4 0.020 9 0.000 2 522 13 436 4 420 2 418 3 298.8 816.2 237.9 0.37 P13-41 0.053 2 0.001 2 0.492 0.010 0.067 2 0.000 5 0.018 8 0.000 2 336 32 406 7 419 3 376 4 170.6 264.7 77.0 0.64 P13-42 0.060 6 0.001 0 0.590 0.008 0.070 7 0.000 5 0.020 8 0.000 2 624 20 471 5 440 3 417 3 315.6 409.3 125.4 0.77 P13-43 0.056 2 0.001 3 0.540 0.011 0.069 7 0.000 5 0.020 7 0.000 2 461 32 438 7 434 3 413 5 104.9 178.1 53.8 0.59 P13-44 0.052 9 0.000 8 0.499 0.007 0.068 6 0.000 4 0.017 0 0.000 2 323 19 411 5 428 3 340 3 253.9 502.1 149.4 0.51 P13-45 0.052 0 0.000 9 0.486 0.008 0.067 8 0.000 4 0.018 4 0.000 2 287 25 402 5 423 3 368 3 249.0 321.7 94.7 0.77 P13-46 0.052 7 0.000 9 0.485 0.008 0.066 8 0.000 4 0.019 2 0.000 2 314 24 401 5 417 3 384 4 115.7 353.7 102.7 0.33 P13-47 0.054 9 0.000 8 0.512 0.006 0.067 8 0.000 4 0.019 0 0.000 2 408 16 420 4 423 2 380 3 558.1 1 282.1 377.6 0.44
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表 5 片麻状石英闪长岩主量元素(%)与微量元素(10-6)化学组成
Table 5. Major element compositions (%) and trace element compositions (10-6) of gneissic quartz diorite
样品 SiO2 Al2O3 ∑Fe2O3T CaO MgO K2O Na2O MnO TiO2 P2O5 烧失量 总计 Cr Ni Rb Ba Th U Nb Ta La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Li Be Sc V Co Cu Pb Zn Ga Ge Cs Y Sr Hf 1 53.62 18.54 8.50 7.87 3.53 1.22 3.25 0.11 1.21 0.27 1.55 99.67 19.6 9.76 16.8 398 3.58 1.01 12.4 0.68 52.8 99.2 10.6 39.0 7.47 1.70 6.22 0.98 4.71 1.00 2.52 0.34 2.08 0.32 11.8 2.69 15.1 152 37.6 16.5 9.26 101.0 25.8 1.22 1.02 25.8 544 4.36 2 54.36 17.90 7.54 6.08 3.17 3.10 4.21 0.10 1.15 0.26 2.15 100.02 21.9 9.51 84.0 705 2.48 0.87 12.2 0.76 38.6 70.2 8.5 34.9 6.63 1.65 5.60 0.90 4.40 0.91 2.33 0.33 1.89 0.29 16.1 2.25 17.8 133 28.9 18.1 5.70 84.1 23.3 1.13 1.66 24.1 363 4.17 3 53.35 19.41 8.54 7.51 3.33 1.87 3.29 0.10 1.29 0.29 1.20 100.18 14.9 8.80 23.6 450 2.56 0.88 14.3 0.93 38.0 67.3 8.4 34.5 6.79 1.72 5.87 0.95 4.76 0.98 2.53 0.35 2.09 0.32 18.3 2.49 20.8 154 32.7 22.5 10.30 101.0 26.7 1.13 1.29 26.1 502 4.17 4 53.02 18.11 8.25 6.35 3.44 2.84 3.63 0.10 1.24 0.28 2.38 99.64 55.1 18.90 55.3 635 3.49 0.99 13.3 0.86 42.3 80.4 9.4 38.4 7.11 1.73 6.04 0.97 4.78 1.01 2.57 0.36 2.16 0.32 14.2 2.38 19.2 146 34.0 19.2 6.71 99.6 24.5 1.16 1.55 26.5 403 5.17 5 56.29 18.03 7.84 6.83 3.18 1.48 3.09 0.09 1.11 0.26 1.56 99.76 19.5 8.43 34.7 397 9.32 1.16 12.0 0.74 64.8 112.0 11.3 42.6 6.94 1.65 5.77 0.91 4.27 0.86 2.28 0.31 1.84 0.30 18.3 2.49 18.3 139 37.5 16.5 103.00 90.4 26.9 1.15 1.09 23.2 528 5.29 6 55.69 18.39 7.70 7.23 3.17 1.11 3.27 0.09 1.12 0.25 2.07 100.09 20.1 9.42 24.4 380 3.89 1.05 10.9 0.59 46.4 82.0 10.1 35.6 6.43 1.55 5.51 0.81 4.31 0.88 2.26 0.30 1.79 0.28 13.7 2.49 17.0 142 39.2 21.6 9.46 113.0 26.5 1.17 1.06 23.0 594 3.37
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