Petrogenesis of Intermediate-acidic Intrusive Rocks in the Western Part of Biezhentao, Xinjiang: Constraints from Petrogeochemistry, Zircon U-Pb Dating and Hf Isotope
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摘要:
新疆别珍套山地区西段所出露的中酸性侵入岩，主要由花岗岩、花岗闪长岩及闪长岩组成。笔者针对研究区不同岩性侵入岩开展了岩石学、锆石U-Pb同位素年代学和Hf同位素研究，以限定其岩石成因及其构造背景。锆石U-Pb定年结果显示花岗岩、花岗闪长岩和两件闪长岩样品的加权平均年龄分别为460.2 Ma、458.4 Ma及403.3～402.2 Ma，花岗岩和花岗闪长岩侵位于中—晚奥陶世，闪长岩则侵位于早泥盆世。在地球化学组成上，三类岩石均表现为富集轻稀土和大离子亲石元素，亏损重稀土和高场强元素，指示三者可能形成于俯冲背景下的岩浆弧环境。花岗闪长岩、闪长岩锆石Hf同位素特征均表现为亏损地幔向球粒陨石过渡的趋势，锆石εHf(t)值分别为−2.4～8.7、−2.5～3.5，二阶段Hf模式年龄远大于成岩年龄。此外，别珍套山西段花岗岩高Sr、低Y和Yb，具典型埃达克岩特征，为加厚下地壳部分熔融形成，受到俯冲板片流体的交代。花岗闪长岩为过铝质的钙碱性系列岩石，属I型花岗岩，其Mg#值为28.9～31.0，为幔源新生下地壳部分熔融形成。闪长岩属准铝质的钙碱性系列岩石，Mg#值为17.3～22.1，同样为幔源新生下地壳部分熔融形成，但可能为区域局部伸展背景下的产物。西天山别珍套山地区早古生代中酸性侵入岩为中奥陶世到早泥盆世北天山洋向南伊犁板块之下俯冲消减的岩浆产物。
Abstract:The intermediate-acidic intrusive rocks exposed in the western part of the Biezhentao mountains area in Xinjiang are mainly composed of granite, granodiorite and amphibolite. In this contribution, petrological, zircon U-Pb isotope chronology and Hf isotope studies were carried out for different lithologies of intrusive rocks in the study area to constrain their petrogenesis, and tectonic setting. The zircon U-Pb dating results show that the granite, granodiorite and two diorite samples have weighted average ages of 460.2 Ma, 458.4 Ma and 403.3-402.2 Ma, respectively, and the granite and granodiorite intruded in the Middle-Late Ordovician, while the amphibolite intruded in the Early Devonian. In terms of geochemical composition, the three types of rocks exhibit enrichment in LREE, LILE, and deficit in HREE, HSFE, indicating that the three types of rocks may be formed in the magmatic arc environment under the subduction background. The zircon Hf isotopic characteristics of granodiorite and diorite show a trend of transition from depleted mantle to chondrite, with zircon εHf(t) values ranging from −2.4 to 8.7 and −2.5 to 3.5, respectively, and the two-stage Hf model ages are much older than the intrusive time. In addition, the granite of the west section of the Beizhentao suite is high in Sr, low in Y and Yb, with typical adakite features, formed by partial melting of the thickened lower crust and accounted for by subduction plate fluids. Granodiorite is a peraluminous calc-alkaline series rock, which belongs to I-type granite. Its Mg# is 28.9 ~ 31.0, which is formed by partial melting of mantle-derived new lower crust. The diorite belongs to the quasi-aluminum calc-alkaline series rock, with Mg# between 17.3 and 22.1, which is also formed by partial melting of the mantle-derived new lower crust, but it may be the product under the background of regional local extension. The Early Paleozoic intermediate-acid intrusive rocks in the Biezhentaoshan area of the Western Tianshan Mountains are magmatic products of the subduction of the North Tianshan Ocean under the southern Yili plate from the Middle-Late Ordovician to the Early Devonian, indicating the environment of the continental margin magmatic arc.
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图 1 赛里木区域构造位置简图（a）、赛里木区域构造单元图（b）和别珍套山西段地质图（c） （a据Long et al.，2011修改；b据何国琦等，1994修改；c据新疆有色地勘局地质矿产勘查研究院资料修改）
Figure 1.
图 4 别珍套山西段花岗闪长岩和闪长岩εHf（t）-年龄关系图（据章永梅等, 2016）
Figure 4.
图 5 别珍套山西段中酸性侵入岩地球化学图解（a据Middlemost, 1994; b据Rickwood, 1989; c据Wright, 1969; d据Maniar et al., 1989）
Figure 5.
图 7 别珍套山西段侵入岩体球粒陨石标准化稀土元素曲线（a）和原始地幔标准化微量元素图解（b） （标准化数据文献Sun et al., 1989）
Figure 7.
图 8 别珍套山西段花岗岩成因类型判别图（a、b据Whalen et al., 1987；c据Setsuya et al., 1979；d据Collins et al., 1982）
Figure 8.
图 10 别珍套山西段花岗岩Mg#-SiO2埃达克岩源区判别图（据Wang et al., 2012）和Dy/Yb比率-SiO2图解（分化趋势据Davidson et al., 2007）
Figure 10.
图 9 别珍套山西段中酸性侵入岩Sr/Y-Y（a）和（La/Yb）N-YbN图解（b） （底图据Defant et al., 1990）
Figure 9.
图 11 别珍套山西段中酸性岩体分离结晶、陆壳混染过程判别图解（a据Mecdonald et al., 2001; b据Tang et al., 2013; c、d据Fan et al., 2004）
Figure 11.
图 12 Sr/Th-Th/Ce图解（a）（据Zhu et al., 2005）、Sr/Nd-Th/Yb图解（b）（据Woodhead et al., 1998）和Th/Nb-Ba/Th图解（c）（据Wang et al., 2005）
Figure 12.
图 13 别珍套山西段岩体样品构造环境判别图（a据Condie, 1989; b、c据Pearce et al., 1984）
Figure 13.
表 1 别珍套山西段不同岩性岩石中锆石U-Pb同位素数据和测年结果
Table 1. Zircon U-Pb isotopic compositions and dating results in rocks of different lithologies in the western section of the Biezhentao suite
测点号 含量（10−6） Th/U 同位素原子比率 同位素年龄（Ma） 谐和度 Pb Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 21BZ-G2 花岗岩 2 59.89 118.3 739.8 0.16 0.0565 0.0020 0.5812 0.0220 0.0741 0.0015 478 77.8 465 14.2 461 8.9 99% 4 83.85 177.8 1009.0 0.18 0.0550 0.0019 0.5729 0.0239 0.0742 0.0015 413 77.8 460 15.4 461 9.0 99% 5 71.46 124.9 845.5 0.15 0.0554 0.0020 0.5718 0.0212 0.0742 0.0012 428 79.6 459 13.7 461 7.1 99% 7 72.11 139.3 860.6 0.16 0.0580 0.0020 0.6002 0.0246 0.0743 0.0017 528 78.7 477 15.6 462 10.2 96% 15 57.47 112.0 691.2 0.16 0.0553 0.0022 0.5658 0.0225 0.0739 0.0013 433 88.9 455 14.6 460 7.9 99% 20 71.87 241.9 839.5 0.29 0.0588 0.0026 0.6004 0.0257 0.0744 0.0017 567 97.1 477 16.3 462 10.1 96% 25 62.58 108.6 787.1 0.14 0.0552 0.0019 0.5736 0.0201 0.0741 0.0012 420 77.8 460 13.0 461 7.4 99% 28 64.29 134.4 821.5 0.16 0.0546 0.0020 0.5706 0.0228 0.0742 0.0015 398 78.7 458 14.7 462 8.9 99% 29 73.44 213.0 875.1 0.24 0.0571 0.0023 0.5964 0.0238 0.0741 0.0011 494 58.3 475 15.2 461 6.7 97% 31 58.95 107.6 715.4 0.15 0.0574 0.0023 0.5939 0.0235 0.0736 0.0012 509 88.9 473 15.0 458 7.1 96% 33 79.70 141.7 967.5 0.15 0.0546 0.0028 0.5586 0.0300 0.0730 0.0011 394 114.8 451 19.5 454 6.5 99% 36 72.49 123.5 857.3 0.14 0.0562 0.0022 0.5747 0.0219 0.0742 0.0012 461 87.0 461 14.1 461 7.1 99% 37 102.48 171.9 1211.3 0.14 0.0552 0.0018 0.5711 0.0196 0.0744 0.0012 433 72.2 459 12.7 463 7.3 99% 21BZ-G1 花岗闪长岩 1 60.89 267.5 682.2 0.39 0.0568 0.0023 0.5902 0.0245 0.0743 0.0012 483 88.9 471 15.6 462 7.1 98% 2 77.80 353.7 895.5 0.39 0.0538 0.0021 0.5430 0.0208 0.0726 0.0009 361 61.1 440 13.7 452 5.7 97% 4 79.74 339.4 873.7 0.39 0.0587 0.0022 0.6060 0.0243 0.0741 0.0016 567 79.6 481 15.4 461 9.7 95% 6 51.95 148.8 633.4 0.23 0.0530 0.0030 0.5742 0.0369 0.0743 0.0027 332 127.8 461 23.8 462 16.1 99% 7 96.64 699.3 1060.3 0.66 0.0548 0.0022 0.5406 0.0212 0.0707 0.0011 467 95.4 439 13.9 441 6.5 99% 8 81.59 321.1 900.7 0.36 0.0574 0.0020 0.5961 0.0219 0.0742 0.0013 506 80.5 475 13.9 462 7.6 97% 9 53.59 152.4 619.7 0.25 0.0591 0.0024 0.6137 0.0268 0.0746 0.0017 572 88.9 486 16.9 464 10.4 95% 10 88.57 447.2 986.6 0.45 0.0556 0.0025 0.5567 0.0235 0.0725 0.0014 435 134.2 449 15.3 451 8.3 99% 11 98.56 545.4 1056.2 0.52 0.0537 0.0025 0.5486 0.0208 0.0737 0.0013 367 103.7 444 13.6 458 7.5 96% 12 82.15 311.3 943.5 0.33 0.0534 0.0019 0.5607 0.0224 0.0750 0.0016 346 81.5 452 14.6 466 9.6 96% 13 86.73 369.6 946.3 0.39 0.0551 0.0019 0.5775 0.0191 0.0753 0.0011 417 80.5 463 12.3 468 6.6 98% 18 124.86 763.5 1430.2 0.53 0.0553 0.0023 0.5641 0.0236 0.0738 0.0013 433 94.4 454 15.3 459 7.9 98% 22 99.48 467.8 1126.1 0.42 0.0571 0.0021 0.5867 0.0228 0.0738 0.0011 494 81.5 469 14.6 459 6.8 97% 24 87.13 373.0 1013.9 0.37 0.0571 0.0022 0.5851 0.0222 0.0739 0.0013 494 84.1 468 14.3 460 7.9 98% 28 71.85 318.2 768.8 0.41 0.0565 0.0020 0.5859 0.0221 0.0742 0.0011 472 77.8 468 14.1 461 6.9 98% 33 61.94 263.6 712.7 0.37 0.0568 0.0025 0.5766 0.0234 0.0739 0.0014 483 100.9 462 15.1 460 8.2 99% 34 107.04 624.7 1174.6 0.53 0.0552 0.0017 0.5716 0.0186 0.0742 0.0011 420 68.5 459 12.0 462 6.4 99% 35 90.06 462.3 1025.7 0.45 0.0559 0.0021 0.5778 0.0225 0.0743 0.0014 456 85.2 463 14.5 462 8.2 99% 36 27.31 124.0 312.1 0.40 0.0559 0.0029 0.5758 0.0301 0.0743 0.0016 450 117.6 462 19.4 462 9.6 99% 38 72.62 318.5 821.0 0.39 0.0564 0.0020 0.5802 0.0204 0.0740 0.0012 478 79.6 465 13.1 460 7.0 99% 19BZ-G1 闪长岩 2 14.01 71.1 187.6 0.38 0.0570 0.0032 0.5062 0.0296 0.0641 0.0011 500 122.2 416 20.0 400 6.5 96% 4 13.03 63.4 168.1 0.38 0.0532 0.0033 0.4756 0.0272 0.0652 0.0011 345 142.6 395 18.8 407 6.4 96% 8 12.26 64.9 157.8 0.41 0.0522 0.0029 0.4666 0.0252 0.0649 0.0010 295 125.9 389 17.5 405 6.0 95% 9 19.26 99.9 253.0 0.39 0.0544 0.0025 0.4856 0.0224 0.0644 0.0010 391 101.8 402 15.3 402 5.9 99% 13 14.66 93.6 187.3 0.50 0.0520 0.0028 0.4658 0.0242 0.0648 0.0010 287 119.4 388 16.8 405 5.8 95% 14 14.70 86.2 196.3 0.44 0.0524 0.0039 0.4685 0.0343 0.0648 0.0011 302 172.2 390 23.7 405 6.9 96% 18 12.28 63.2 158.3 0.40 0.0612 0.0033 0.5454 0.0289 0.0647 0.0010 656 117.4 442 19.0 404 6.3 91% 20 15.85 86.5 200.1 0.43 0.0595 0.0035 0.5230 0.0296 0.0644 0.0011 583 129.6 427 19.8 402 6.5 94% 22 14.48 73.4 189.5 0.39 0.0545 0.0029 0.4875 0.0250 0.0646 0.0011 394 88.0 403 17.1 403 6.6 99% 23 16.50 99.9 208.4 0.48 0.0593 0.0032 0.5264 0.0270 0.0644 0.0010 589 118.5 429 17.9 402 5.8 93% 26 17.11 97.2 228.9 0.42 0.0488 0.0026 0.4359 0.0229 0.0641 0.0010 200 124.1 367 16.2 401 6.1 91% 27 18.14 108.2 236.8 0.46 0.0592 0.0035 0.5257 0.0299 0.0640 0.0010 572 129.6 429 19.9 400 6.1 93% 28 23.93 152.1 303.8 0.50 0.0551 0.0029 0.4938 0.0247 0.0647 0.0010 417 116.7 407 16.8 404 5.8 99% 29 12.14 67.5 159.4 0.42 0.0531 0.0034 0.4772 0.0289 0.0646 0.0011 332 141.6 396 19.9 403 6.8 98% 31 58.00 451.7 700.5 0.64 0.0593 0.0025 0.5378 0.0219 0.0650 0.0010 589 123.1 437 14.4 406 6.1 92% 32 16.73 92.2 218.0 0.42 0.0606 0.0033 0.5346 0.0264 0.0646 0.0010 633 121.3 435 17.5 403 6.2 92% 33 15.12 92.8 196.0 0.47 0.0572 0.0032 0.5122 0.0281 0.0649 0.0011 502 124.1 420 18.9 406 6.5 96% 34 13.33 69.7 175.7 0.40 0.0549 0.0032 0.4827 0.0260 0.0644 0.0010 409 129.6 400 17.8 402 6.2 99% 21BZ-D 闪长岩 5 14.33 86.9 188.9 0.46 0.0525 0.0036 0.4763 0.0336 0.0645 0.0015 306 157.4 396 23.1 403 9.0 98% 7 11.00 63.1 146.5 0.43 0.0535 0.0035 0.4750 0.0306 0.0645 0.0014 350 150.9 395 21.0 403 8.8 97% 9 19.66 105.9 255.2 0.42 0.0572 0.0033 0.5121 0.0281 0.0644 0.0011 498 125.9 420 18.9 402 6.8 95% 14 18.95 149.2 234.4 0.64 0.0547 0.0031 0.4888 0.0271 0.0643 0.0012 398 127.8 404 18.5 402 7.5 99% 16 21.11 151.2 264.2 0.57 0.0537 0.0030 0.4814 0.0267 0.0644 0.0012 367 125.9 399 18.3 402 7.3 99% 17 16.73 103.4 216.8 0.48 0.0527 0.0033 0.4724 0.0303 0.0644 0.0012 317 142.6 393 20.9 403 7.5 97% 18 16.91 104.1 218.3 0.48 0.0528 0.0036 0.4726 0.0314 0.0644 0.0012 320 149.1 393 21.7 402 7.0 97% 19 11.19 59.4 150.1 0.40 0.0562 0.0039 0.4932 0.0345 0.0643 0.0015 461 153.7 407 23.4 402 8.8 98% 22 15.35 53.5 209.8 0.26 0.0568 0.0030 0.5041 0.0276 0.0644 0.0012 483 116.7 414 18.6 402 7.3 97% 24 12.98 76.9 164.3 0.47 0.0554 0.0035 0.4842 0.0296 0.0644 0.0012 428 142.6 401 20.3 402 7.1 99% 27 27.36 141.4 351.1 0.40 0.0554 0.0024 0.4892 0.0216 0.0643 0.0011 428 98.1 404 14.7 402 6.4 99% 29 9.73 51.7 125.9 0.41 0.0635 0.0048 0.5413 0.0363 0.0643 0.0014 728 156.5 439 23.9 402 8.2 91% 30 19.16 124.3 243.6 0.51 0.0531 0.0029 0.4698 0.0267 0.0644 0.0013 345 124.1 391 18.4 402 7.8 97% 31 32.81 305.0 384.4 0.79 0.0561 0.0029 0.5002 0.0268 0.0645 0.0011 457 114.8 412 18.1 403 6.4 97% 32 10.41 55.4 136.3 0.41 0.0611 0.0044 0.5302 0.0373 0.0641 0.0012 643 155.5 432 24.7 401 7.4 92% 34 10.54 50.8 140.3 0.36 0.0561 0.0042 0.4923 0.0348 0.0645 0.0015 454 166.6 406 23.7 403 8.9 99% 36 16.51 101.5 219.0 0.46 0.0569 0.0029 0.5081 0.0283 0.0644 0.0014 487 114.8 417 19.0 402 8.7 96% 38 16.31 78.5 220.1 0.36 0.0532 0.0033 0.4600 0.0248 0.0644 0.0013 345 143.5 384 17.2 402 7.7 95% 39 11.24 60.2 146.2 0.41 0.0542 0.0043 0.4685 0.0333 0.0644 0.0014 389 177.8 390 23.1 403 8.4 96% 40 21.04 135.9 269.9 0.50 0.0541 0.0031 0.4755 0.0260 0.0645 0.0013 376 129.6 395 17.9 403 7.9 98% 
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表 2 别珍套山西段花岗闪长岩和闪长岩锆石Lu-Hf同位素分析结果
Table 2. Lu-Hf isotopic compositions and related parameters of zircons from granodiorite and amphibolite in the western section of the Biezhentao suite
测点号 年龄（Ma） 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 2σ ɛHf（0） ɛHf（t） TDM TDM2 fLu/Hf 21BZ-G1 花岗闪长岩 1 461.8 0.075252 0.002009 0.282728 0.000020 −1.5 8.0 762 929 −0.94 2 451.7 0.076667 0.002114 0.282754 0.000024 −0.6 8.7 727 879 −0.94 3 460.5 0.056082 0.001535 0.282669 0.000020 −3.6 6.0 838 1055 −0.95 4 440.3 0.058608 0.001527 0.282620 0.000020 −5.4 3.9 908 1177 −0.95 5 461.8 0.031095 0.000914 0.282449 0.000031 −11.4 −1.5 1133 1537 −0.97 6 440.6 0.079593 0.002046 0.282661 0.000023 −3.9 5.2 861 1094 −0.94 7 463.9 0.064233 0.001776 0.282670 0.000024 −3.6 6.1 841 1054 −0.95 8 458.4 0.062497 0.001644 0.282635 0.000024 −4.8 4.8 888 1133 −0.95 9 466.3 0.077579 0.001850 0.282704 0.000018 −2.4 7.3 794 978 −0.94 10 473.2 0.059918 0.001761 0.282434 0.000026 −12.0 −2.1 1180 1580 −0.95 11 467.9 0.064247 0.001712 0.282706 0.000020 −2.3 7.4 788 970 −0.95 12 471.8 0.046076 0.001250 0.282421 0.000020 −12.4 −2.4 1182 1599 −0.96 13 461.1 0.069448 0.001769 0.282655 0.000023 −4.2 5.5 863 1090 −0.95 14 459.7 0.059415 0.001607 0.282651 0.000022 −4.3 5.4 865 1097 −0.95 15 462.0 0.061391 0.001568 0.282588 0.000023 −6.5 3.2 955 1238 −0.95 16 462.1 0.019017 0.000583 0.282503 0.000028 −9.5 0.5 1048 1409 −0.98 19BZ-G1 闪长岩 1 400.5 0.015346 0.000614 0.282584 0.000012 −6.6 2.0 936 1265 −0.98 2 400.3 0.029235 0.001125 0.282552 0.000013 −7.8 0.8 993 1344 −0.97 3 407.3 0.023912 0.000958 0.282611 0.000012 −5.7 3.0 907 1207 −0.97 4 398.3 0.036305 0.001493 0.282599 0.000026 −6.1 2.3 936 1246 −0.96 5 400.7 0.029105 0.001179 0.282631 0.000012 −5.0 3.5 883 1168 −0.96 6 404.1 0.018711 0.000774 0.282586 0.000013 −6.6 2.1 936 1259 −0.98 7 405.1 0.020557 0.000842 0.282612 0.000012 −5.7 3.0 903 1204 −0.97 8 402.1 0.027607 0.001123 0.282565 0.000011 −7.3 1.2 975 1315 −0.97 9 403.2 0.033077 0.001346 0.282610 0.000014 −5.7 2.8 918 1218 −0.96 10 403.1 0.023197 0.000958 0.282559 0.000013 −7.5 1.1 979 1325 −0.97 11 403.0 0.028093 0.001144 0.282606 0.000012 −5.9 2.7 918 1223 −0.97 12 404.5 0.025597 0.001041 0.282605 0.000021 −5.9 2.7 917 1223 −0.97 13 402.8 0.029118 0.001196 0.282569 0.000013 −7.2 1.4 971 1306 −0.96 14 405.7 0.028927 0.001184 0.282457 0.000017 −11.2 −2.5 1130 1558 −0.96 15 405.0 0.032025 0.001302 0.282598 0.000013 −6.2 2.4 934 1244 −0.96 16 404.1 0.018516 0.000768 0.282589 0.000012 −6.5 2.2 933 1255 −0.98 17 402.9 0.032618 0.001323 0.282609 0.000012 −5.8 2.8 918 1219 −0.96 18 402.3 0.032640 0.001379 0.282584 0.000015 −6.6 1.9 955 1277 −0.96 19 403.3 0.024766 0.001018 0.282586 0.000011 −6.6 2.0 943 1265 −0.97 20 402.3 0.023325 0.000972 0.282591 0.000014 −6.4 2.2 934 1253 −0.97 21 406.9 0.025988 0.001048 0.282586 0.000011 −6.6 2.1 944 1264 −0.97 22 400.8 0.024556 0.001018 0.282599 0.000013 −6.1 2.5 924 1237 −0.97 23 400.1 0.028670 0.001181 0.282567 0.000013 −7.2 1.2 974 1313 −0.96 24 404.0 0.020074 0.000829 0.282537 0.000013 −8.3 0.4 1007 1372 −0.98 25 403.3 0.024160 0.000996 0.282596 0.000014 −6.2 2.4 929 1244 −0.97 26 407.6 0.015832 0.000661 0.282592 0.000012 −6.4 2.4 925 1242 −0.98 27 406.0 0.032733 0.001296 0.282584 0.000015 −6.6 1.9 953 1273 −0.96 28 403.3 0.042175 0.001700 0.282619 0.000014 −5.4 3.0 913 1203 −0.95 29 405.6 0.032909 0.001312 0.282592 0.000012 −6.4 2.2 942 1256 −0.96 30 402.2 0.018092 0.000749 0.282574 0.000012 −7.0 1.7 953 1288 −0.98 31 404.7 0.035340 0.001395 0.282568 0.000016 −7.2 1.3 978 1311 −0.96
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表 3 别珍套山西段中酸性侵入岩主量元素含量（%）
Table 3. Major element compositions (%) of intermediate-acidic intrusive rocks in the western section of the Biezhentao suite
样品号 岩性 SiO2 TiO2 Al2O3 Fe2O3 MnO MgO CaO Na2O K2O P2O5 LOI Total FeOT Mg# 19BZ-G2-18 花岗岩 72.1 0.11 17.0 0.74 0.02 0.24 1.60 5.10 2.32 0.03 0.50 99.7 0.67 35.8 19BZ-G2-19 花岗岩 72.9 0.13 16.5 0.90 0.02 0.23 1.56 5.05 2.38 0.04 0.40 100.1 0.81 30.6 19BZ-G2-20 花岗岩 71.1 0.12 17.1 0.88 0.02 0.24 1.66 6.24 2.21 0.04 0.37 100.0 0.79 32.0 19BZ-G2-24 花岗岩 72.3 0.11 16.6 0.73 0.02 0.17 1.18 5.30 2.93 0.03 0.24 99.6 0.66 28.6 19BZ-G2-26 花岗岩 72.6 0.1 17.1 0.71 0.01 0.21 1.01 4.75 2.65 0.03 0.37 99.6 0.64 33.8 19BZ-G2-27 花岗岩 73.3 0.11 16.5 0.76 0.02 0.15 1.15 5.11 2.50 0.03 0.36 100.0 0.69 25.4 21BZ-G2-13 花岗岩 72.1 0.11 17.1 0.87 0.02 0.20 1.89 5.05 2.20 0.04 0.46 100.0 0.78 28.8 21BZ-G2-20 花岗岩 71.2 0.11 18.5 0.84 0.02 0.23 1.77 4.70 2.07 0.03 0.56 100.0 0.76 32.4 21BZ-G2-21 花岗岩 73.3 0.13 16.8 0.88 0.02 0.20 1.53 4.39 1.99 0.03 0.63 100.0 0.80 27.6 21BZ-G1-2 花岗闪长岩 66.1 0.38 18.2 3.34 0.07 0.87 4.35 3.34 1.77 0.13 1.61 100.2 3.05 31.0 21BZ-G1-3 花岗闪长岩 65.4 0.42 18.4 4.01 0.08 0.96 4.05 3.96 1.31 0.16 1.41 100.2 3.65 29.2 21BZ-G1-6 花岗闪长岩 65.8 0.38 17.8 3.68 0.07 0.90 3.46 4.50 1.23 0.15 1.20 99.1 3.38 29.6 21BZ-G1-7 花岗闪长岩 68.1 0.28 17.3 2.26 0.04 0.57 3.40 5.12 1.25 0.13 1.13 99.5 2.07 30.3 21BZ-G1-9 花岗闪长岩 65.3 0.36 18.2 3.77 0.07 0.97 4.20 4.07 1.35 0.14 1.31 99.8 3.45 30.7 21BZ-G1-11 花岗闪长岩 66.0 0.38 18.5 3.50 0.07 0.83 3.33 4.88 1.64 0.14 0.91 100.2 3.17 28.9 19BZ-G1-4 闪长岩 58.9 1.19 15.9 10.59 0.16 1.30 4.71 4.16 2.39 0.39 0.40 100.0 9.57 17.5 19BZ-G1-6 闪长岩 59.3 1.05 15.6 11.12 0.18 1.35 4.23 3.54 2.51 0.36 0.39 99.6 10.08 17.3 19BZ-G1-8 闪长岩 59.2 1.15 16.1 10.31 0.16 1.28 4.66 3.99 2.15 0.38 0.44 99.8 9.33 17.6 19BZ-G1-12 闪长岩 58.1 1.34 16.7 10.93 0.16 1.66 5.47 3.49 1.70 0.46 0.31 100.3 9.84 20.7 19BZ-G1-13 闪长岩 58.0 1.18 17.2 10.25 0.16 1.58 5.25 3.77 1.68 0.34 0.36 99.7 9.28 21.0 19BZ-G1-15 闪长岩 56.4 1.3 16.7 11.80 0.19 1.55 5.37 3.35 2.02 0.43 0.21 99.4 10.71 18.5 21BZ-D-25 闪长岩 57.9 1.13 16.6 10.29 0.16 1.44 4.82 3.46 2.12 0.35 0.94 99.2 9.43 19.4 21BZ-D-26 闪长岩 54.6 1.62 16.9 13.20 0.21 2.18 3.76 2.31 2.14 0.58 2.53 100.0 12.19 22.1 21BZ-D-28 闪长岩 54.5 1.42 17.7 12.45 0.19 1.68 5.57 3.81 2.13 0.51 1.00 101.0 11.21 18.9 21BZ-D-31 闪长岩 58.7 1.03 18.0 9.96 0.17 1.41 3.91 3.59 2.15 0.31 0.77 100.0 9.04 19.6 注：FeOT= 0.8998 ×Fe2O3T，Mg#=（MgO/40）（MgO/40+FeOT/62）×100。
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表 4 别珍套山西段中酸性侵入岩稀土和微量元素含量（10−6）及特征参数
Table 4. Trace element compositions (10−6) and related parameters of the intermediate-acidic intrusive rocks in the western section of the Biezhentao suite
样品号 岩性 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu ΣREE LREE/
HREEδEu 19BZ-G2-18 花岗岩 5.12 10.5 1.27 5.15 1.07 0.373 0.961 0.197 1.16 0.239 0.664 0.122 0.741 0.104 27.67 5.61 1.10 19BZ-G2-19 花岗岩 5.37 11.0 1.32 5.24 1.08 0.370 0.970 0.206 1.14 0.239 0.677 0.120 0.743 0.104 28.58 5.81 1.08 19BZ-G2-20 花岗岩 5.49 11.0 1.29 5.04 1.08 0.382 0.988 0.189 1.17 0.241 0.685 0.126 0.836 0.114 28.63 5.58 1.11 19BZ-G2-24 花岗岩 4.19 9.18 1.05 4.08 1.01 0.349 0.941 0.209 1.28 0.276 0.738 0.139 0.844 0.113 24.40 4.37 1.08 19BZ-G2-26 花岗岩 5.16 11.3 1.31 4.95 1.35 0.355 1.30 0.279 1.79 0.376 0.988 0.183 1.04 0.139 30.52 4.01 0.81 19BZ-G2-27 花岗岩 3.99 8.28 0.976 4.05 0.986 0.338 0.950 0.216 1.39 0.291 0.773 0.142 0.833 0.110 23.33 3.96 1.05 21BZ-G2-13 花岗岩 2.87 6.83 0.774 3.31 0.878 0.134 1.02 0.245 1.09 0.208 0.585 0.083 0.548 0.077 18.65 3.84 0.43 21BZ-G2-20 花岗岩 2.68 5.86 0.692 2.87 0.714 0.030 0.801 0.183 0.969 0.183 0.603 0.088 0.584 0.084 16.34 3.68 0.12 21BZ-G2-21 花岗岩 2.51 5.42 0.656 2.60 0.625 0.036 0.743 0.153 0.827 0.157 0.506 0.079 0.474 0.073 14.86 3.93 0.16 21BZ-G1-2 花岗闪长岩 28.7 56.9 6.65 26.9 5.62 1.42 6.00 1.13 5.47 1.02 3.12 0.414 2.74 0.420 146.5 6.21 0.74 21BZ-G1-3 花岗闪长岩 27.1 52.3 6.42 27.6 6.02 1.60 6.53 1.31 6.15 1.20 3.69 0.478 3.10 0.459 144.0 5.28 0.78 21BZ-G1-6 花岗闪长岩 33.3 67.8 7.67 31.3 6.64 1.27 7.24 1.46 7.20 1.40 4.40 0.573 3.76 0.547 174.6 5.57 0.56 21BZ-G1-7 花岗闪长岩 24.9 45.6 5.76 24.1 4.72 1.25 4.95 0.910 4.19 0.768 2.40 0.309 1.99 0.287 122.1 6.73 0.78 21BZ-G1-9 花岗闪长岩 28.1 54.0 6.60 27.3 6.03 1.49 6.54 1.31 6.57 1.24 3.82 0.514 3.16 0.466 147.1 5.23 0.72 21BZ-G1-11 花岗闪长岩 35.1 75.4 7.94 31.5 6.59 1.46 7.25 1.48 7.20 1.34 4.22 0.554 3.73 0.531 184.3 6.01 0.64 19BZ-G1-4 闪长岩 27.7 64.1 8.75 40.0 9.45 2.40 8.52 1.75 10.0 1.99 5.32 0.953 5.91 0.842 187.7 4.32 0.80 19BZ-G1-6 闪长岩 31.6 72.6 9.43 41.3 9.56 2.03 8.05 1.63 9.50 1.88 4.99 0.881 5.36 0.843 199.7 5.03 0.69 19BZ-G1-8 闪长岩 31.2 71.9 9.42 41.8 9.92 2.41 8.67 1.76 10.1 2.02 5.36 0.936 5.75 0.850 202.1 4.70 0.78 19BZ-G1-12 闪长岩 34.3 73.6 9.28 40.2 9.23 2.38 7.95 1.57 8.78 1.80 4.86 0.858 5.18 0.774 200.8 5.32 0.83 19BZ-G1-13 闪长岩 28.2 58.9 7.52 31.8 7.41 2.23 6.51 1.27 7.30 1.49 4.06 0.716 4.44 0.652 162.5 5.15 0.96 19BZ-G1-15 闪长岩 35.9 76.4 10.0 43.9 10.1 2.40 8.71 1.75 9.91 2.00 5.40 0.908 5.57 0.822 213.8 5.10 0.76 21BZ-D-25 闪长岩 25.7 60.3 8.23 40.9 10.5 3.60 10.8 2.29 11.1 2.11 6.48 0.882 5.88 0.897 189.7 3.69 1.02 21BZ-D-26 闪长岩 30.8 78.9 10.1 50.3 12.4 3.43 13.4 2.77 12.9 2.42 7.21 0.934 6.11 0.923 232.6 3.98 0.81 21BZ-D-28 闪长岩 40.2 97.7 11.9 55.7 12.9 3.48 13.7 2.72 12.6 2.34 7.14 0.913 6.07 0.895 268.3 4.78 0.79 21BZ-D-31 闪长岩 46.6 99.1 11.0 48.8 9.87 3.27 10.7 1.98 9.11 1.71 5.13 0.679 4.77 0.729 253.4 6.28 0.97
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