LA-ICP-MS zircon U-Pb ages and Hf isotopic characteristics of Wuxukelaoge pluton in East Junggar Basin of Xinjiang and their geological significance
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摘要:
新疆东准噶尔琼河坝地区近年来找矿获得重大突破，发现了一系列重要的矿产，这些矿产基本上围绕该地区出露面积最大的乌须克劳格岩体分布。该岩体组成比较复杂，主要岩性为二长花岗岩和花岗闪长岩。采用LA-ICP-MS技术测得花岗闪长岩和二长花岗岩锆石206Pb/238U年龄分别为428.9±1.9Ma和427.2±1.7Ma，被解释为岩石的结晶年龄。2类岩石都属于过铝质-钙碱性系列花岗岩，具有较高的铝、钙含量，K2O/Na2O值普遍偏低，介于0.15～0.40之间；稀土元素配分曲线呈现右倾特征，稀土元素总量较低，轻稀土元素相对富集，负Eu异常不明显；在微量元素原始地幔标准化蛛网图上，高场强元素Th、Nb、Ta、P、Ti等相对亏损，大离子亲石元素Rb、Ba、U、K、Sr等相对富集，具有高Ba、Sr含量和高（La/Yb）N、Sr/Y值，显示出高Ba-Sr花岗岩的特征；同时岩体具有高正εHf（t）值和年轻的模式年龄。这些地球化学和同位素特征表明，晚志留世乌须克劳格岩体是大陆边缘弧环境下大洋板片熔融的产物。
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关键词:
- LA-ICP-MS锆石U-Pb年龄 /
- 地球化学 /
- Hf同位素 /
- 乌须克劳格岩体
Abstract:Thanks to prospecting breakthrough in recent years, a series of important mineral resources have been found in Qionghebagion and it has a complex composition, mainly comprising granodiorite and monzonitic granite. In this paper, U-Pb dating of LAICP-MS zircon was used to investigate the age of the pluton. It is shown that granodiorite is 428.9±1.9Ma and monzonitic granite is 427.2±1.7Ma in age, suggesting that the two ages represent the ages of rocks that contain the zircon. Both the granodiorite and mon-zonitic granite are of peraluminous and calc-alkaline series with high Al2O3 (15.87%~18.77%), CaO (2.92%~6.82%) and low K2O/Na2O ratios (0.15~0.40); The pluton has low total REE content (57.33×10-6~72.13×10-6) with relative enrichment of LREE and ob-scure Eu negative anomaly (δEu=0.79~1.06). The primitive mantle normalized trace element patterns are characterized by the deple-tion of the HFSE (Th, Nb, Ta, P, Ti) and enrichment of the LILE (Rb, Ba, U, K, Sr). High Ba (230×10-6~682×10-6), Sr(851.8×10-6~1020.1×10-6), high (La/Yb)N(6.0~10.1), Sr/Y(70.0~106.4) ratios, and distinct Nb all suggest features of high Ba-Sr granitoids. The test results of Hf isotope show that Wuxukelaoge pluton has high and positive εHf(t) values(14.28~17.54) and younger model age. These geochemical and Hf isotope characteristics indicate that the pluton was formed in a continental margin arc setting and related to partial melting of subducted oceanic crust. area, East Junggar Basin, Xinjiang, which are essentially distributed around Wuxukelaoge pluton. The pluton is the largest in the re-
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Keywords:
- LA-ICP-MS zircon U-Pb dating /
- geochemistry /
- Hf isotopes /
- Wuxukelaoge pluton
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图 1 乌须克劳格岩体地理位置（a）、大地构造位置（b）[8]和地质简图（c）
Figure 1. Geographic location (a), tectonic location (b) and geological map(c)of Wuxukelaoge pluton
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图 2 乌须克劳格岩体部分锆石CL图像、测点位置及年龄值
Figure 2. CL images, testing spots and 206Pb/238U ages of zircon crystals from Wuxukelaoge pluton
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图 3 乌须克劳格花岗闪长岩（H711.4.5）和二长花岗岩（H13701-12.1）锆石U-Pb谐和图
Figure 3. U-Pb concordia diagrams of the zircon in the Wuxukelaoge granodiorite (H711.4.5) and monzonitic granite(H13701-12.1)
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图 4 乌须克劳格岩体A/CNK-A/NK图解（a）和SiO2-K2O图解(b)
Figure 4. Diagrams of A/CNK-A/NK (a) and SiO2-K2O(b) for the Wuxukelaoge pluton
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图 5 乌须克劳格岩体主量元素Harker图解
Figure 5. Harker diagrams of major elements for Wuxukelaoge granodiorite (H711.4.5)and monzonitic granite(H13701-12.1)
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图 6 乌须克劳格岩体稀土元素配分模式(a)和微量元素蛛网图(b)
Figure 6. Chondrite-nomalized REE patterns (a) and primitive-mantle normalized trace element patterns (b) for the Wuxukelaoge pluton
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图 8 乌须克劳格花岗闪长岩和二长花岗岩的t-εHf(t)图解
Figure 8. Diagram of t-εHf(t) of granodiorite and monzonitic granite from Wuxukelaoge pluton
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图 9 乌须克劳格岩体Y-Nb（a）和（Yb+Nb）-Rb（b）图解
Figure 9. Y-Nb (a)and(Yb+Nb)-Rb (b)diagram of the Wuxukelaoge granodiorite (H711.4.5)and monzonitic granite(H13701-12.1)
表 1 乌须克劳格二长花岗岩（H711.4.5）和花岗闪长岩岩（H13701-12.1）LA-ICP-MS锆石U-Th-Pb同位素数据
Table 1 LA-ICP-MS zircon U-Th-Pb analytical data of the Wuxukelaoge granodiorite(H711.4.5) and monzonitic granite(H13701-12.1)
样品号 含量/10-6 同位素比值 同位素比值 年龄/Ma Pb U Th 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 208Pb/232Th 1σ 232Th/238U 1σ 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ H711.4.5花岗闪长岩 1 26 350 378 0.0689 0.00042 0.6102 0.0083 0.0643 0.0009 0.0316 0.0002 0.3522 0.0008 429 3 484 7 750 29 2 116 1378 542 0.0683 0.00041 0.5603 0.0042 0.0595 0.0004 0.0255 0.0001 0.952 0.0030 426 2 452 3 584 16 3 41 576 634 0.0684 0.00038 0.5297 0.0054 0.0562 0.0006 0.0269 0.0001 0.3564 0.0005 426 3 432 4 459 22 4 36 462 570 0.0723 0.00039 0.5447 0.0092 0.0546 0.0009 0.0225 0.0001 0.6035 0.0016 450 3 442 7 397 38 5 51 703 371 0.0682 0.00040 0.6811 0.0058 0.0724 0.0006 0.0287 0.0002 0.3912 0.0007 425 3 527 5 998 17 6 20 291 420 0.0681 0.00043 0.5295 0.0118 0.0564 0.0012 0.0209 0.0002 0.43 0.0038 425 3 431 10 468 48 7 49 653 584 0.0694 0.00053 0.5567 0.0064 0.0581 0.0006 0.0226 0.0001 0.5749 0.0007 433 3 449 5 535 24 8 30 408 712 0.0689 0.00048 0.6494 0.0112 0.0683 0.0012 0.0238 0.0003 0.4588 0.0022 430 2 508 9 878 36 9 17 244 578 0.0684 0.00045 0.5263 0.0103 0.0558 0.0011 0.0195 0.0001 0.3676 0.0008 426 3 429 8 445 43 10 21 295 639 0.0684 0.00044 0.6058 0.0098 0.0643 0.0009 0.0204 0.0002 0.4579 0.0004 426 3 481 8 750 31 11 22 308 431 0.0682 0.00042 0.5756 0.0136 0.0612 0.0014 0.0191 0.0001 0.5163 0.0007 425 3 462 11 647 50 12 33 395 543 0.0773 0.00051 0.726 0.0135 0.0682 0.0013 0.0254 0.0002 0.5201 0.0009 480 3 554 10 873 38 13 22 299 678 0.0686 0.00042 0.5855 0.0094 0.0619 0.001 0.0218 0.0002 0.4711 0.001 428 2 468 7 670 34 14 25 331 984 0.0697 0.00041 0.6995 0.0111 0.0728 0.0012 0.0263 0.0003 0.4042 0.0019 434 3 539 9 1007 32 15 40 558 675 0.0697 0.00042 0.5354 0.0053 0.0557 0.0005 0.019 0.0001 0.4301 0.0012 434 3 435 4 441 22 16 51 646 321 0.0687 0.00044 0.6726 0.0134 0.0711 0.0013 0.023 0.0003 0.7412 0.0043 428 3 522 10 959 37 17 29 382 324 0.0689 0.00043 0.5339 0.0073 0.0562 0.0007 0.0227 0.0001 0.5828 0.0011 430 3 434 6 459 29 18 26 364 655 0.0689 0.00045 0.5653 0.0072 0.0595 0.0007 0.024 0.0001 0.427 0.0008 429 3 455 6 586 26 19 21 313 344 0.0682 0.00043 0.5296 0.0083 0.0563 0.0009 0.0226 0.0001 0.3169 0.0003 425 3 432 7 465 34 20 21 307 643 0.0680 0.00042 0.5101 0.0069 0.0544 0.0007 0.0225 0.0001 0.3383 0.0009 424 3 419 6 387 30 21 22 308 521 0.0683 0.00041 0.5198 0.0092 0.0552 0.0011 0.0214 0.0001 0.4419 0.0032 426 3 425 7 419 39 22 35 524 579 0.0696 0.00039 0.8063 0.0098 0.084 0.0012 0.02 0.0001 0.0628 0.0001 434 3 600 7 1292 22 23 28 379 631 0.0692 0.00046 0.6291 0.0078 0.0659 0.0008 0.0213 0.0001 0.4783 0.0016 431 3 496 6 805 26 24 30 429 642 0.0683 0.00042 0.5123 0.0066 0.0544 0.0007 0.0175 0.0001 0.525 0.0027 426 2 420 5 389 28 25 18 253 765 0.0691 0.00041 0.6314 0.0095 0.0663 0.0012 0.0236 0.0001 0.4 0.0008 431 3 497 7 815 30 26 21 286 789 0.0689 0.00066 0.5312 0.0194 0.0559 0.0014 0.0238 0.0005 0.4305 0.0012 429 4 433 16 450 56 27 64 854 789 0.0705 0.00045 0.5308 0.0068 0.0546 0.0007 0.0214 0.0001 0.5642 0.0018 439 3 432 6 396 28 28 22 299 645 0.0695 0.00053 0.5322 0.0111 0.0555 0.0011 0.0249 0.0002 0.3962 0.0009 433 3 433 9 434 45 29 65 799 787 0.0697 0.00042 0.5289 0.0043 0.0551 0.0004 0.024 0.0001 0.8289 0.0029 434 3 431 4 415 18 30 22 300 546 0.0693 0.00041 0.5328 0.0087 0.0558 0.0009 0.024 0.0001 0.4846 0.0037 432 3 434 7 443 36 H13701.12.1二长花岗岩 1 15 196 345 0.0687 0.00051 0.5181 0.0135 0.0547 0.0008 0.0301 0.0002 0.4512 0.0015 428 3 424 11 400 31 2 26 371 468 0.0682 0.00046 0.5162 0.0153 0.0549 0.0011 0.0272 0.0002 0.3284 0.0003 425 3 423 13 409 46 3 13 175 328 0.0688 0.00045 0.5226 0.0154 0.055 0.0011 0.0236 0.0002 0.4073 0.0012 429 3 427 13 414 45 4 9 133 638 0.0686 0.00042 0.5237 0.0147 0.0554 0.001 0.0219 0.0002 0.3753 0.001 428 3 428 12 428 38 5 12 158 789 0.0684 0.00043 0.7343 0.0285 0.0779 0.0026 0.0274 0.0003 0.4677 0.0006 426 3 559 22 1144 66 6 9 131 456 0.0683 0.00041 0.5249 0.0170 0.0557 0.0013 0.0218 0.0002 0.2731 0.0002 426 3 428 14 442 53 7 9 123 321 0.0689 0.00042 0.5293 0.0161 0.0557 0.0012 0.0205 0.0002 0.3685 0.0012 430 3 431 13 441 47 8 10 145 789 0.0689 0.00044 0.5183 0.0124 0.0546 0.0006 0.019 0.0014 0.3117 0.0009 429 2 424 10 395 24 9 19 231 543 0.0681 0.00043 0.8674 0.0302 0.0924 0.0025 0.0432 0.0004 0.5076 0.0014 425 3 634 22 1476 52 10 7 104 123 0.0691 0.00048 0.5186 0.0163 0.0544 0.0013 0.0216 0.0002 0.287 0.0032 431 3 424 13 388 52 11 13 185 99 0.0688 0.00038 0.5211 0.0168 0.0549 0.0013 0.0229 0.0002 0.4337 0.0008 429 3 426 14 410 54 12 9 129 432 0.0689 0.00036 0.5233 0.0174 0.0551 0.0014 0.0224 0.0002 0.3533 0.002 430 3 427 14 415 56 H13701.12.1二长花岗岩 13 10 143 421 0.0681 0.00045 0.5245 0.0169 0.0558 0.0013 0.0229 0.0002 0.5064 0.0011 425 2 428 14 446 53 14 15 209 456 0.0685 0.00045 0.5214 0.029 0.0552 0.0028 0.0258 0.0003 0.4592 0.0015 427 3 426 24 421 114 15 12 169 766 0.0685 0.00045 0.5243 0.0437 0.0555 0.0045 0.0226 0.0004 0.5804 0.0013 427 3 428 36 434 181 16 10 134 588 0.0679 0.00042 0.5212 0.0126 0.0557 0.0006 0.0234 0.0016 0.6147 0.0007 423 2 426 10 441 24 17 11 148 432 0.0682 0.00051 0.5247 0.0252 0.0558 0.0024 0.0239 0.0003 0.5885 0.0016 425 3 428 20 444 94 18 12 153 456 0.0677 0.00042 0.5156 0.0247 0.0553 0.0024 0.0256 0.0003 0.686 0.0013 422 3 422 20 423 95 19 18 283 786 0.0678 0.00052 0.5235 0.0377 0.056 0.0038 0.0218 0.0009 0.0628 0.0002 423 3 427 31 452 151 20 9 121 325 0.0674 0.00024 0.6625 0.022 0.0713 0.0018 0.0251 0.0002 0.4631 0.0007 421 3 516 17 965 53 21 14 179 634 0.0666 0.00053 0.7379 0.0598 0.0803 0.0063 0.0267 0.0007 0.5828 0.0046 416 3 561 46 1204 154 22 7 90 453 0.0686 0.00042 0.5231 0.0211 0.0553 0.0019 0.0292 0.0002 0.5608 0.0011 427 3 427 17 426 76 23 9 124 376 0.0679 0.00041 0.5172 0.0132 0.0552 0.0008 0.0213 0.0006 0.505 0.0008 424 2 423 11 421 32 24 23 332 890 0.0673 0.00041 0.5306 0.0128 0.0572 0.0006 0.0315 0.0017 0.2271 0.0004 420 2 432 10 498 25 25 8 103 780 0.0715 0.00042 0.7702 0.0247 0.0781 0.0018 0.028 0.0002 0.616 0.0012 445 3 580 19 1151 47 26 10 123 560 0.0673 0.00051 0.5198 0.0243 0.056 0.0023 0.0256 0.0004 0.707 0.0048 420 3 425 20 452 90 27 11 140 542 0.0698 0.00048 0.5177 0.0191 0.0538 0.0016 0.0274 0.0002 0.5947 0.0011 435 3 424 16 363 67 28 12 167 213 0.0693 0.00057 0.5166 0.0415 0.054 0.0042 0.0221 0.0006 0.5487 0.0015 432 3 423 34 372 175 29 10 129 465 0.0698 0.00045 0.5216 0.0186 0.0542 0.0015 0.0258 0.0004 0.5625 0.0015 435 3 426 15 379 64 30 8 103 342 0.069 0.00043 0.5328 0.0131 0.056 0.0007 0.0319 0.0023 0.3855 0.0006 430 2 434 11 454 27 注：表中所列误差均为1σ 
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表 2 乌须克劳格岩体地球化学分析结果
Table 2 Geochemicall analysis results of the Wuxukelaoge granodiorite and monzonitic granite
样品号 H711-4.1 H711-4.2 H711-4.3 H711-4.4 H711-4.5 H13701-12.1 H13701-12.2 H13701-12.3 H13701-12.4 H13701-12.5 H13701-12.6 岩性 花岗岩闪长岩 二长花岗岩 SiO2 58.77 59.15 56.26 60.91 59.81 68.09 68.10 67.60 66.86 67.99 68.36 TiO2 0.74 0.74 0.80 0.59 0.68 0.38 0.37 0.38 0.36 0.31 0.33 Al2O3 18.01 17.89 18.77 17.66 17.64 15.87 16.07 16.02 16.58 16.15 15.97 Fe2O3 5.90 5.91 6.55 4.89 5.40 2.96 2.64 2.91 2.92 2.57 2.59 MnO 0.09 0.10 0.11 0.09 0.09 0.06 0.05 0.05 0.05 0.05 0.05 MgO 2.61 2.55 2.88 2.16 2.28 1.09 0.96 1.02 1.01 0.93 0.91 CaO 6.48 5.75 6.82 5.35 6.06 3.07 3.07 3.07 3.27 2.92 2.99 NazO 4.27 4.39 4.51 4.55 4.24 5.20 5.35 5.29 5.59 5.28 5.26 K2O 1.08 1.00 0.66 1.53 0.99 1.93 2.05 2.06 1.84 2.02 2.11 K2O/Na2O 0.25 0.23 0.15 0.34 0.23 0.37 0.38 0.39 0.33 0.38 0.40 P2O5 0.26 0.26 0.31 0.23 0.25 0.12 0.09 0.11 0.10 0.12 0.10 烧失量 1.50 1.90 2.00 1.70 2.20 1.05 1.03 1.30 1.20 1.42 1.12 总量 99.69 99.67 99.67 99.70 99.67 99.80 99.79 99.80 99.74 99.74 99.80 A/CNK 1.28 1.32 1.31 1.26 1.30 1.18 1.16 1.17 1.17 1.19 1.17 A/NK 2.20 2.15 2.31 1.93 2.19 1.49 1.46 1.47 1.48 1.49 1.46 Y 10.4 10.5 10.9 9.7 9.0 12.6 11.4 12.0 11.8 10.1 7.5 La 12.8 12.0 11.2 10.7 11.7 12.9 12.3 12.1 12.7 11.4 11.9 Ce 28.4 26.7 23.8 24.5 27.3 27.5 26.9 27.4 29.0 24.4 23.0 Pr 3.49 3.31 3.21 2.84 3.27 3.42 3.33 3.39 3.43 3.18 2.54 Nd 14.0 16.3 14.1 11.8 14.6 15.6 15.7 14.5 15.4 14.2 11.3 Sm 2.92 2.83 3.21 2.63 2.89 3.29 3.12 2.91 3.09 2.88 2.21 Eu 0.93 0.94 0.98 0.78 0.88 0.77 0.76 0.76 0.80 0.72 0.63 Gd 2.61 2.51 2.65 2.07 2.43 2.49 2.66 2.75 2.43 2.24 2.11 Tb 0.37 0.39 0.39 0.31 0.36 0.33 0.35 0.35 0.33 0.29 0.24 Dy 2.01 2.24 2.04 1.55 1.59 2.09 2.37 2.27 2.13 1.95 1.30 Ho 0.38 0.37 0.40 0.32 0.34 0.34 0.36 0.44 0.40 0.32 0.30 Er 0.98 1.05 1.14 0.94 1.04 1.05 1.24 1.25 0.94 0.92 0.74 Tm 0.16 0.16 0.17 0.13 0.14 0.18 0.18 0.16 0.17 0.15 0.12 Yb 0.91 1.14 0.98 1.07 0.94 1.30 0.90 1.07 1.14 1.09 0.77 Lu 0.14 0.16 0.15 0.14 0.16 0.21 0.20 0.18 0.17 0.14 0.17 SREE 70.10 70.10 64.42 59.78 67.64 71.47 70.37 69.53 72.13 63.88 57.33 LREE 62.54 62.08 56.50 53.25 60.64 63.48 62.11 61.06 64.42 56.78 51.58 HREE 7.56 8.02 7.92 6.53 7.00 7.99 8.26 8.47 7.71 7.10 5.75 LREE/HREE 8.27 7.74 7.13 8.15 8.66 7.94 7.52 7.21 8.36 8.00 8.97 (La/Yb)N 10.09 7.55 8.20 7.17 8.93 7.12 9.80 8.11 7.99 7.50 11.09 SEu 1.01 1.06 1.00 0.99 0.99 0.79 0.79 0.81 0.86 0.84 0.88 Ba 393 374 230 480 336 528 681 559 422 592 682 Co 15.21 14.72 16.32 11.95 14.12 6.32 4.20 5.41 4.93 4.95 4.59 Cs 0.74 0.73 0.72 0.62 0.74 0.27 0.65 0.15 0.48 0.37 0.44 Ga 19.41 19.52 19.51 17.43 18.04 18.86 17.71 18.62 19.12 18.76 18.52 Hf 2.21 2.10 1.80 2.01 2.12 2.62 2.92 2.94 3.36 2.74 3.05 Nb 3.31 2.91 3.05 2.87 2.88 3.12 3.45 3.22 5.02 3.21 3.12 Rb 18.85 18.37 10.29 23.18 18.75 23.32 27.55 25.34 24.72 27.67 25.35 Sr 985.4 948.0 1020.1 918.8 957.2 868.3 886.0 880.2 952.3 937.6 851.8 Ta 0.21 0.17 0.28 0.12 0.15 0.34 0.43 0.21 0.42 0.34 0.25 Th 1.61 1.52 1.41 1.54 1.63 2.02 2.21 2.11 2.14 1.78 2.04 U 0.70 0.62 0.72 0.83 0.79 1.07 0.66 1.15 0.96 0.93 1.02 V 150.4 150.5 165.1 117.9 137.8 60.6 57.5 58.3 64.2 49.1 54.0 Zr 71.41 76.91 65.42 63.19 69.38 110.72 105.72 108.01 122.48 106.87 108.45 注：主量元素含量单位为%；微量和稀土元素含量为10-6；Fe2O3含量为全铁含量
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表 3 乌须克劳格花岗闪长岩岩与二长花岗岩岩锆石Hf同位素分析结果
Table 3 Hf isotopic data compositions for the zircon grains from Wuxukelaoge granodiorite and monzonitic granite
样品号 锆石年龄/Ma 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 176Hf/177Hf 2σ εHf(0) εHf(t) TDM TDMC fLu/Hf H711-4.5 花岗岩闪长岩 1 429 0.035812 0.000989 0.282941 0.282941 0.000015 5.98 15.14 441 448 -0.97 1.1 429 0.052719 0.001398 0.283003 0.283003 0.000011 8.17 17.22 357 314 -0.96 2 429 0.05048 0.001421 0.282991 0.282956 0.000013 7.74 16.79 374 342 -0.96 3 429 0.057013 0.001503 0.282984 0.282984 0.000011 7.50 16.52 385 359 -0.95 4 429 0.07203 0.001831 0.283002 0.283002 0.000011 8.13 17.06 362 324 -0.94 5 429 0.057854 0.001482 0.282981 0.282956 0.000012 7.39 16.42 389 366 -0.96 6 429 0.061337 0.001519 0.282997 0.282997 0.000013 7.96 16.97 367 330 -0.95 7 429 0.078173 0.002002 0.283003 0.283003 0.000012 8.17 17.05 363 325 -0.94 8 429 0.072063 0.00147 0.283008 0.283059 0.000016 8.35 17.38 350 304 -0.96 9 429 0.053002 0.001513 0.282997 0.282962 0.000011 7.96 16.97 367 330 -0.95 10 429 0.05628 0.001473 0.283008 0.283008 0.000011 8.35 17.38 350 304 -0.96 11 429 0.079271 0.001997 0.283017 0.283017 0.000013 8.66 17.54 342 293 -0.94 11.1 429 0.079271 0.002042 0.283003 0.283017 0.000013 8.17 17.04 363 326 -0.94 12 429 0.068901 0.001781 0.283004 0.282996 0.000015 8.20 17.15 359 319 -0.95 H13701-12.1 二长花岗岩 2 427 0.075659 0.001809 0.282929 0.282977 0.000015 5.55 14.44 468 492 -0.95 3 427 0.035422 0.000889 0.28292 0.282905 0.000013 5.23 14.38 470 496 -0.97 4 427 0.097967 0.002234 0.282976 0.283021 0.000014 7.21 15.98 405 392 -0.93 5 427 0.049091 0.001282 0.282944 0.282944 0.000008 6.08 15.12 440 448 -0.96 6 427 0.024233 0.000613 0.282915 0.282915 0.000013 5.06 14.28 473 502 -0.98 7 427 0.036418 0.000981 0.282951 0.282951 0.00001 6.33 15.45 427 427 -0.97 8 427 0.050856 0.001306 0.282936 0.282936 0.000011 5.80 14.83 452 467 -0.96 9 427 0.061499 0.001563 0.282972 0.282981 0.000009 7.07 16.03 403 389 -0.95 10 427 0.031345 0.000809 0.282925 0.282905 0.000014 5.41 14.58 462 483 -0.98 11 427 0.046422 0.001219 0.282936 0.282936 0.000008 5.80 14.86 451 465 -0.96 12 427 0.026218 0.000743 0.282947 0.282947 0.00001 6.19 15.38 430 431 -0.98 注：εHf(t)=10000×{[(176Hf/177Hf)S-(176Lu/177Hf)S×(eλt-1)]/[(176Hf/177Hf)CHUR，0-(176Lu/177Hf)CHUR×(eλt-1)-1}；tDM1=1/ λln{1+[(176Hf/177Hf)S-(176Hf/177Hf)DM]/[(176Lu/177Hf)S-(176Lu/177Hf)DM]}；tDM2=1/λ×ln{1+[(176Hf/177Hf)S, t-(176Hf/177Hf)DM，t]/[(176Lu/177Hf)c-(176Lu/177Hf) DM]} + t；(176Lu/177Hf)S和(176Hf/177Hf)S为样品测定值；(176Hf/177Hf)CHUR, 0=0.282772，(176Lu /177Hf)CHUR=0.0332，(176Hf/177Hf)DM=0.28325，(176Lu/177Hf)DM=0.0384[24-25]；λ=1.867×10-11/a[26]；(176 Lu/177Hf)c=0.015；t为锆石结晶时间
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