LA-ICP-MS zircon U-Pb age of Late Carboniferous quartz diorite in Yiwu area of Xinjiang and its geological significance
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摘要:
新疆伊吾地区晚石炭世侵入岩产于天山-兴蒙造山系谢米斯台-库兰卡兹干古生代复合岛弧带的东段。用LA-ICP-MS技术测得伊吾地区石英闪长岩中锆石206Pb/238U年龄为312.4±1.5Ma(MSWD=0.18,n=30),属晚石炭世。岩石化学资料表明,伊吾地区晚石炭世侵入岩为准铝质高钾钙碱性岩系,轻稀土元素富集,重稀土元素平坦,具中等程度的负Eu异常。微量元素中富集轻稀土元素及Ba、Th等大离子亲石元素,而相对亏损Nb、Ti、P元素,P元素较强亏损可能与磷灰石分离结晶作用有关,元素地球化学组成指示其与大陆地壳物质具有明显的亲缘性;以上资料揭示,伊吾地区在晚石炭世已经处于后碰撞构造环境。
Abstract:The Late Carboniferous intrusions in Yiwu region of Xinjiang were produced in the eastern section of TianshanXingmeng orogenic belt. LA-ICP-MS technological analysis shows that the quartz diorite zircon 206Pb/238U age of the study area is 312.4±1.5Ma (MSWD=0.18, n=30), suggesting Late Carboniferous epoch. The petrochemical data show that the late Carboniferous intrusive rocks in Yiwu region belong to aluminum alkaline rock series characterized by LREE enrichment and HREE flat type, with moderate Eu negative anomaly. Trace elements in rocks are characterized by enrichment of light rare earth elements and large ion lithophile elements such as Ba and Th, and the relative loss of Nb, Ti and P; strong P element loss may be associated with apatite crystallization separation. These elements and the continental crust material have an obvious affinity. These data reveal that the Yiwu region was in a post-collision tectonic environment in the Late Carboniferous.
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Key words:
- Yiwu region /
- Late Carboniferous /
- quartz diorite /
- LA-ICP-MS zircon U-Pb age /
- petrogeochemistry /
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表 1 晚石炭世侵入岩锆石U-Th-Pb同位素数据(样品YQ06-TW02)
Table 1. U-Th-Pb isotope composition of the zircon in Late Carboniferous intrusive rock (YQ06-TW02)
测试点 含量/10-6 Th/U 同位素比值及误差 同位素年龄及误差/Ma Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 1 109 212 0.51 0.053 0.0028 0.373 0.018 0.0511 0.0007 327.0 116.9 321.8 13.6 321.1 4.6 2 53 141 0.38 0.053 0.0045 0.367 0.030 0.0498 0.0011 346.8 179.5 317.4 22.0 313.4 6.6 3 51 115 0.44 0.054 0.0039 0.3696 0.025 0.0499 0.0009 360.2 155.1 319.4 18.8 313.7 5.7 4 382 389 0.98 0.054 0.0041 0.3688 0.026 0.0498 0.001 359.4 161.5 318.8 19.6 313.2 6.0 5 103 297 0.35 0.053 0.0038 0.3606 0.024 0.0493 0.0009 329.0 153.5 312.7 18.2 310.4 5.6 6 56 159 0.35 0.053 0.0063 0.3586 0.042 0.0495 0.0015 309.2 251.0 311.2 31.0 311.4 9.0 7 309 337 0.92 0.054 0.004 0.3662 0.026 0.049 0.001 379.9 158.0 316.9 19.1 308.3 5.9 8 213 314 0.68 0.053 0.0023 0.3589 0.014 0.0496 0.0006 308.1 98.5 311.4 10.7 311.7 3.9 9 564 551 1.02 0.053 0.0022 0.3614 0.014 0.0495 0.0006 328.3 93.1 313.2 10.1 311.2 3.7 10 404 430 0.94 0.053 0.0044 0.3615 0.029 0.0499 0.0011 310.8 178.4 313.3 21.5 313.6 6.6 11 385 367 1.05 0.053 0.0048 0.3635 0.032 0.0493 0.0012 346.9 192.2 314.8 23.6 310.5 7.1 12 151 285 0.53 0.053 0.0016 0.3624 0.009 0.0498 0.0005 321.2 68.7 314 6.6 313.0 3.0 13 168 309 0.54 0.053 0.0019 0.3632 0.011 0.0496 0.0006 332.9 80.3 314.6 8.3 312.1 3.4 14 69 182 0.38 0.053 0.0019 0.3588 0.011 0.0495 0.0005 308.9 80.7 311.3 8.2 311.6 3.3 15 251 305 0.82 0.053 0.0019 0.365 0.011 0.0499 0.0006 330.9 80.3 315.9 8.3 313.9 3.4 16 218 261 0.83 0.054 0.0058 0.3653 0.038 0.0494 0.0014 356.6 227.6 316.1 28.4 310.6 8.3 17 96 240 0.4 0.053 0.0023 0.3644 0.014 0.0497 0.0006 334.6 96 315.5 10.6 312.8 3.8 18 585 560 1.04 0.053 0.0015 0.3604 0.008 0.0496 0.0005 316.3 63.3 312.5 5.7 312.0 2.9 19 109 153 0.71 0.053 0.0026 0.3597 0.016 0.0495 0.0007 317.5 108.6 312.0 12.1 311.2 4.1 20 124 272 0.45 0.054 0.0037 0.3661 0.024 0.0495 0.0009 353.5 149.4 316.8 17.9 311.7 5.6 21 223 232 0.96 0.053 0.002 0.3638 0.012 0.0497 0.0006 333.0 82.9 315 8.7 312.5 3.4 22 85 139 0.61 0.053 0.0025 0.3641 0.015 0.0496 0.0007 339.3 102.7 315.3 11.5 312.0 4.0 23 122 195 0.63 0.053 0.0025 0.3614 0.015 0.0497 0.0007 319.0 103.9 313.2 11.5 312.4 4.1 24 151 184 0.82 0.053 0.0048 0.3636 0.031 0.0499 0.0012 321.4 192.0 314.9 23.4 314.0 7.1 25 463 375 1.24 0.053 0.0017 0.3646 0.010 0.0497 0.0005 336.4 71.5 315.6 7.0 312.8 3.2 26 142 220 0.65 0.053 0.0019 0.3638 0.011 0.0496 0.0005 338.2 78.1 315.0 8.0 311.8 3.3 27 37 245 0.15 0.054 0.0028 0.3675 0.018 0.0497 0.0007 356.9 114.4 317.8 13.3 312.4 4.5 28 208 295 0.7 0.054 0.0029 0.3667 0.018 0.0495 0.0007 359.4 116.6 317.2 13.5 311.4 4.5 29 41 528 0.08 0.053 0.0015 0.363 0.008 0.0495 0.0005 336.8 63.3 314.5 5.6 311.4 2.9 30 79 151 0.53 0.053 0.0061 0.3623 0.041 0.0499 0.0014 313.4 243.6 314.0 30.3 313.9 8.8 注:测试单位为中国地质科学院矿产资源研究所 表 2 晚石炭世侵入岩主量、微量和稀土元素分析数据及特征参数
Table 2. The major, trace and rare earth elements composition and characteristic parameters of Late Carboniferous intrusive rocks
元素 石英闪长玢岩 石英二长闪长玢岩 石英闪长岩 YQ06-11 YQ06-52 YQ06-54 YQ06-03 YQ06-04 YQ06-09 YQ06-40 YQ06-44 SiO2 60.45 63.93 60.15 57.85 56.00 58.67 57.80 50.88 TiO2 0.86 0.88 0.93 1.32 1.49 1.32 1.27 2.20 Al2O3 16.56 14.84 15.15 14.97 15.46 15.28 14.97 14.45 Fe2O3 3.84 3.36 4.87 4.95 5.04 4.79 5.26 6.16 FeO 5.10 5.01 6.27 6.79 7.57 6.51 6.94 10.27 MnO 0.12 0.10 0.15 0.15 0.14 0.15 0.15 0.19 MgO 2.23 1.34 1.16 1.98 2.59 2.07 1.96 3.13 CaO 2.66 3.41 2.89 3.84 4.31 3.12 3.16 5.14 Na2O 6.74 3.02 4.67 4.68 4.86 5.13 5.03 4.39 K2O 1.00 3.65 3.17 2.71 1.81 2.29 2.71 1.77 P2O5 0.25 0.24 0.35 0.50 0.46 0.48 0.50 0.87 总计 99.81 99.77 99.75 99.72 99.72 99.81 99.74 99.46 σ 3.38 2.13 3.44 3.48 3.18 3.34 3.83 4.29 SI 11.69 8.09 5.67 9.24 11.68 9.88 8.83 11.92 DI 69.80 68.62 69.68 64.14 58.23 65.98 66.03 49.47 AR 2.35 1.99 2.54 2.29 2.02 2.35 2.49 1.92 FL 74.43 66.17 73.03 65.83 60.77 70.40 71.02 54.51 MF 80.35 86.49 90.79 85.87 83.28 84.71 86.42 84.43 OX 0.57 0.60 0.56 0.58 0.60 0.58 0.57 0.63 A/NK 1.36 1.67 1.36 1.41 1.55 1.40 1.34 1.58 A/CNK 0.98 0.99 0.93 0.86 0.88 0.93 0.89 0.79 KN 7.83 6.65 8.07 7.63 6.91 7.66 7.99 6.34 La 18.00 33.60 45.20 36.10 20.80 29.10 40.50 44.20 Ce 38.30 70.20 92.60 80.00 46.10 66.80 82.70 115.00 Pr 5.00 10.50 13.60 10.60 6.30 8.90 12.20 14.90 Nd 21.40 43.40 56.60 47.80 30.00 41.10 52.30 65.80 Sm 4.80 9.98 12.70 10.60 6.70 9.20 11.70 15.20 Eu 1.70 2.19 2.89 2.50 2.10 2.50 2.81 3.54 Gd 4.50 8.81 10.90 9.60 6.40 8.80 10.30 13.20 Tb 0.82 1.59 1.95 1.70 1.10 1.60 1.80 2.33 Dy 4.60 9.46 11.40 10.00 6.60 9.70 10.80 13.50 Ho 0.90 1.96 2.34 2.00 1.30 1.90 2.24 2.81 Er 2.50 5.20 6.11 5.40 3.60 5.30 5.93 7.19 Tm 0.40 0.86 1.03 0.0. 0.56 0.81 0.98 1.16 Yb 2.60 6.08 6.94 5.00 3.50 5.40 6.97 7.80 Lu 0.47 0.92 1.05 0.78 0.54 0.89 1.05 1.19 Y 23.60 49.4 58.40 50.70 32.90 50.10 55.30 67.00 ∑REE 129.59 254.15 323.71 273.58 168.50 242.10 297.58 374.82 LREE 89.20 169.87 223.59 187.60 112.00 157.60 202.21 258.64 HREE 16.79 34.88 41.72 35.28 23.60 34.40 40.07 49.18 LREE/HREE 5.31 4.87 5.36 5.32 4.75 4.58 5.05 5.26 (La/Yb)N 4.67 3.73 4.39 4.87 4.01 3.63 3.92 3.82 δEu 1.10 0.70 0.73 0.74 0.97 0.84 0.77 0.75 Zr 243.00 555.00 579.00 480.00 219.00 443.00 518.00 335.00 V 77.67 78.13 82.31 91.84 173.00 74.09 101.74 88.54 Th 1.67 6.55 7.87 3.76 1.28 1.86 7.47 4.55 Sc 14.38 12.71 17.66 18.04 18.93 23.43 19.56 29.35 Sr 360.00 566.00 436.00 520.00 647.00 358.00 417.00 404.00 Rb 16.20 60.90 79.90 68.60 39.60 48.40 63.70 38.77 Nb 6.44 16.90 18.82 12.83 8.89 11.39 17.25 16.95 Cr 7.95 10.46 8.17 8.76 15.35 8.14 17.19 19.06 Ba 757.00 766.00 693.00 702.00 684.00 660.00 585.00 435.00 Hf 6.03 11.12 19.89 13.94 4.91 9.22 15.08 9.84 Ta 0.31 0.58 0.40 0.37 0.17 0.14 0.51 0.26 注:主量元素含量单位为%,微量和稀土元素含量单位为10-6 -
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