Age, Petrogenesis and Tectonic Implications of Permian Hornblendite in Tugurige, Urad Zhongqi, Inner Mongolia
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摘要: 为了对古亚洲洋的演化提供新的资料,对内蒙中部乌拉特中旗图古日格角闪石岩进行了角闪石电子探针分析、锆石LA-ICP-MS U-Pb年代学,锆石Hf同位素和岩石地球化学分析,以确定其岩石成因及其地球动力学背景.两件测年样品加权平均年龄分别为273.5±1.3 Ma(MSWD=0.48) 和274.4±4.3 Ma(MSWD=0.041),属于早二叠世晚期.角闪石岩贫SiO2、Na2O、K2O,富Al2O3、TFe2O3、MgO和CaO,Mg#值为46.95~63.53,M/F比值为0.87~1.72;稀土元素配分曲线为右倾型,和原始地幔相比明显富集大离子亲石元素(Rb、Ba、K),而高场强元素Nb、Ta和Ti相对亏损,Th、U同样显示出相对亏损.电子探针分析结果表明角闪石岩中角闪石属于钙质角闪石,具有幔源角闪石的特点.角闪石岩中锆石的ε Hf(t)值为-0.3~8.5,锆石Hf单阶段模式年龄(t DM1)为580~920 Ma.研究表明其源区主要为亏损地幔,上涌过程中与富集岩石圈地幔发生相互作用,形成具有富集地幔特征岩浆.结合区域地质演化,认为角闪石岩形成于古亚洲洋闭合后的伸展环境,可能与俯冲板片的断离有关.Abstract: Electron microprobe results, zircon U-Pb dating, Hf isotope data and geochemistry of hornblendite at Tugurige, Urad Zhongqi, Inner Mongolia are reported in the paper, which provide constraints on formation time, magma source, and tectonic setting of the intrusions. The dating results indicate that the hornblendite formed in the late Early Permian (273.5±1.3 Ma, MSWD=0.48; 274.4±4.3 Ma, MSWD=0.041), and it contains low Na2O and K2O, high Al2O3, TFe2O3, MgO, CaO, Mg#=46.95-63.53, M/F=0.87-1.72. Chondrite-normalized REE patterns show LREE enrichment. On a trace element spider diagram, large ion lithophile elements (LILEs) such as Rb, Ba and K are enriched, whereas the high field strength elements Ti, P, Th and U are relatively depleted. Electronic Probe analysis results show that hornblende belongs to calcic amphibole and has the characteristics of mantle hornblende. The ε Hf(t) values of zircons from the hornblendite vary between -0.3 and 8.5, and their Hf one-stage model ages vary from 580 to 920 Ma, implying that their magma source was derived from a depleted mantle and may have been added metasomatic enriched lithospheric mantle components. Combined with regional tectonic evolution, the hornblendite formed in the post-collisional extension setting, perhaps triggered by slab break-off.
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Key words:
- Inner Mongolia /
- Urad Zhongqi /
- crystal chemistry /
- geochronology /
- geochemistry /
- Hf isotope
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图 4 角闪石的成分变化与定名
CaB.B位置Ca原子数;(Na+K)A.A位置Na与K原子数之和;TSi.T位置Si原子数;AlⅥ.C位置AlⅥ的原子数;Fe3+.C位置Fe3+的原子数;据Leake(1997)
Fig. 4. Classification of hornblendes
图 7 图古日格角闪石岩稀土元素配分模式(a)和微量元素蛛网图(b)
图a球粒陨石值据Boynton(1984); 图b原始地幔值据Sun and McDonough(1989)
Fig. 7. >Chondrite-normalized REE patterns(a) and primitive mantle-normalized trace element patterns(b) for the Tugurige hornblendite
图 9 图古日格角闪石岩Th/Yb-Nb/Yb图解(a)、Ba/Th-Th/Nb图解(b)和Nb/Zr-Th/Zr图解(c)
图a据Pearce(2008);图b据Hanyu et al.(2006);图c据Woodhead et al.(2001)
Fig. 9. Th/Yb-Nb/Yb, Ba/Th-Th/Nb and Nb/Zr-Th/Zr diagrams of Tugurige hornblendite
表 1 图古日格角闪石岩中角闪石电子探针分析结果
Table 1. Results of electron microprobe analysis of Tugurige hornblendite
样品 TG3-1 TG3-2 TG3-3 TG3-4 TG3-5 TG3-6 TG4-1 TG4-2 TG4-3 TG4-4 TG4-5 TG4-6 SiO2 40.96 41.75 40.91 43.37 41.27 40.57 41.84 41.19 41.29 42.06 42.09 41.58 TiO2 2.47 2.34 2.41 1.91 2.64 2.39 1.06 2.10 3.19 2.56 2.41 2.28 Al2O3 13.28 12.69 13.21 10.87 13.58 12.99 13.17 12.72 12.63 12.33 12.19 12.86 TFeO 13.40 14.54 14.07 15.49 12.90 16.14 15.53 12.81 13.28 13.07 13.97 12.52 百
分
含
量Cr2O3 0.02 0.00 0.00 0.00 0.01 0.01 0.14 0.00 0.00 0.01 0.00 0.02 MnO 0.18 0.20 0.17 0.24 0.17 0.22 0.21 0.14 0.14 0.15 0.20 0.18 MgO 11.84 11.60 11.59 11.82 12.24 10.49 11.23 11.91 12.35 12.65 12.00 12.34 CaO 11.13 11.05 11.25 10.87 11.19 11.01 11.10 11.30 11.08 11.40 11.05 11.33 CoO 0.01 0.06 0.07 0.04 0.01 0.00 0.07 0.04 0.07 0.03 0.02 0.04 NiO 0.01 0.03 0.02 0.00 0.02 0.02 0.00 0.00 0.00 0.00 0.01 0.04 K2O 0.96 1.08 0.90 0.88 0.80 0.97 0.74 0.92 0.85 0.91 1.00 0.79 Na2O 2.36 2.23 2.33 2.06 2.28 2.18 2.22 2.21 2.13 2.17 2.18 2.27 Total 96.61 97.56 96.94 97.55 97.11 96.99 97.31 95.34 96.99 97.34 97.12 96.25 T Si 6.17 6.29 6.16 6.53 6.22 6.11 6.30 6.20 6.22 6.34 6.34 6.26 AlⅣ 1.83 1.71 1.84 1.47 1.78 1.89 1.70 1.80 1.78 1.66 1.66 1.74 C AlⅥ 0.52 0.54 0.50 0.46 0.62 0.41 0.64 0.46 0.46 0.52 0.50 0.54 Ti 0.25 0.23 0.24 0.19 0.26 0.24 0.11 0.21 0.32 0.26 0.24 0.23 Cr 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.00 0.00 Fe3+ 1.47 1.58 1.53 1.65 1.33 1.53 1.69 1.04 1.42 1.35 1.52 1.40 Mn 0.02 0.03 0.02 0.03 0.02 0.03 0.03 0.02 0.02 0.02 0.03 0.02 Mg 2.67 2.62 2.62 2.67 2.77 2.37 2.54 2.69 2.79 2.86 2.71 2.79 Fe2+ 0.06 0.00 0.08 0.00 0.00 0.42 0.00 0.58 0.00 0.00 0.00 0.01 B Ca 1.80 1.78 1.82 1.75 1.81 1.78 1.79 1.82 1.79 1.84 1.78 1.83 Na 0.20 0.22 0.18 0.25 0.19 0.22 0.21 0.18 0.21 0.16 0.22 0.17 A Na 0.48 0.43 0.50 0.36 0.47 0.41 0.44 0.47 0.41 0.47 0.42 0.49 K 0.18 0.21 0.17 0.17 0.15 0.19 0.14 0.18 0.16 0.18 0.19 0.15 Fe3++Fe2+ 1.53 1.58 1.61 1.65 1.33 1.95 1.69 1.62 1.42 1.35 1.52 1.42 Mg/(Mg+Fe2+) 0.98 1.00 0.97 1.00 1.00 0.85 1.00 0.82 1.00 1.00 1.00 1.00 Si/(Si+Ti+Al) 0.703 0.717 0.705 0.755 0.700 0.706 0.721 0.716 0.709 0.722 0.725 0.714 Ca/(Ca+Mg+Fe) 0.30 0.30 0.30 0.29 0.31 0.29 0.30 0.30 0.30 0.30 0.30 0.30 表 2 图古日格角闪石岩锆石LA-ICP-MS U-Pb同位素定年结果
Table 2. Results of LA-ICP-MS zircon U-Pb dating of Tugurige hornblendite
测点号 Pb(10-6) Th(10-6) U(10-6) Th/U 207Pb/206Pb 207Pb/235U 206Pb/238U 206Pb/238U 比值 1σ 比值 1σ 比值 1σ 年龄(Ma) 1σ 1##-1 43.7 177.2 311.1 0.57 0.052 1 0.002 3 0.309 2 0.013 4 0.043 2 0.000 5 273 3 1##-2 34.6 130.8 258.1 0.51 0.051 8 0.002 1 0.310 5 0.012 7 0.043 3 0.000 4 273 3 1##-3 58.3 246.1 348.6 0.71 0.052 8 0.005 7 0.313 3 0.033 3 0.043 2 0.000 8 273 5 1##-4 47.4 200.3 302.0 0.66 0.049 6 0.001 9 0.297 3 0.011 1 0.043 8 0.000 5 277 3 1##-5 89.0 345.4 632.2 0.55 0.051 5 0.001 9 0.312 5 0.012 2 0.043 8 0.000 5 276 3 1##-6 50.1 208.5 363.4 0.57 0.047 4 0.001 9 0.281 7 0.011 5 0.043 0 0.000 4 271 3 1##-7 76.1 330.6 440.5 0.75 0.049 5 0.001 9 0.292 6 0.011 0 0.042 8 0.000 4 270 2 1##-8 118.8 510.9 742.6 0.69 0.050 5 0.001 3 0.302 2 0.008 2 0.043 0 0.000 3 272 2 1##-9 26.4 101.1 179.6 0.56 0.051 7 0.003 5 0.310 1 0.021 6 0.043 3 0.000 7 273 5 1##-10 72.0 318.5 488.0 0.65 0.050 0 0.002 7 0.299 2 0.015 5 0.043 3 0.000 6 273 4 1##-11 55.3 233.1 358.6 0.65 0.053 1 0.004 1 0.318 1 0.024 1 0.043 8 0.000 7 276 4 1##-12 29.9 135.2 249.8 0.54 0.049 2 0.004 9 0.299 5 0.031 0 0.043 5 0.000 8 275 5 1##-13 38.7 154.9 285.9 0.54 0.050 9 0.002 2 0.304 9 0.013 0 0.043 6 0.000 5 275 3 1##-14 66.0 289.4 398.8 0.73 0.050 2 0.001 8 0.299 4 0.010 6 0.043 1 0.000 4 272 2 1##-15 39.3 161.9 265.1 0.61 0.050 4 0.002 3 0.303 7 0.013 8 0.043 5 0.000 5 275 3 1##-16 52.8 227.3 357.5 0.64 0.050 5 0.002 8 0.303 6 0.015 6 0.043 7 0.000 6 276 3 1##-17 49.0 200.4 353.8 0.57 0.053 0 0.001 7 0.316 7 0.010 4 0.043 1 0.000 4 272 2 1##-18 55.5 218.9 365.3 0.60 0.051 1 0.001 9 0.307 2 0.011 0 0.043 5 0.000 4 275 2 1##-19 190.4 854.3 746.0 1.15 0.050 7 0.001 4 0.306 8 0.008 2 0.043 7 0.000 3 276 2 1##-20 25.3 100.5 170.5 0.59 0.052 7 0.003 2 0.307 8 0.017 3 0.043 5 0.000 6 274 3 TG-3-1 14.0 200.3 247.8 0.81 0.051 8 0.002 9 0.310 5 0.019 0 0.043 5 0.001 8 274 11 TG-3-2 31.1 440.1 569.0 0.77 0.052 0 0.001 9 0.311 4 0.013 9 0.043 5 0.001 7 274 11 TG-3-3 11.1 121.8 194.8 0.63 0.052 0 0.002 5 0.310 6 0.016 8 0.043 3 0.001 8 273 11 TG-3-4 55.7 556.4 1 068.0 0.52 0.054 3 0.001 8 0.324 9 0.013 6 0.043 4 0.001 7 274 11 TG-3-5 95.6 1 012.1 2 146.9 0.47 0.051 2 0.001 6 0.306 4 0.012 5 0.043 4 0.001 7 274 11 TG-3-6 40.3 761.4 630.6 1.21 0.051 9 0.002 1 0.311 0 0.014 9 0.043 5 0.001 8 274 11 TG-3-7 29.9 449.6 536.7 0.84 0.054 2 0.002 6 0.319 8 0.017 1 0.042 8 0.001 8 270 11 TG-3-8 25.1 398.3 472.4 0.84 0.051 5 0.002 0 0.309 2 0.014 1 0.043 6 0.001 8 275 11 TG-3-9 73.8 1 344.4 1 332.0 1.01 0.051 7 0.001 7 0.308 5 0.013 0 0.043 3 0.001 7 273 11 TG-3-10 88.3 1 763.9 1 250.1 1.41 0.051 5 0.002 9 0.309 3 0.018 6 0.043 6 0.001 8 275 11 TG-3-11 165.9 3 119.5 2 847.9 1.10 0.052 0 0.001 7 0.310 0 0.013 0 0.043 3 0.001 7 273 11 TG-3-12 120.6 1 872.8 2 096.7 0.89 0.051 1 0.001 6 0.307 1 0.012 5 0.043 6 0.001 8 275 11 TG-3-13 75.8 1 936.6 1 132.4 1.71 0.051 8 0.001 8 0.310 9 0.013 3 0.043 5 0.001 8 275 11 TG-3-14 29.0 299.4 504.7 0.59 0.051 6 0.002 5 0.308 6 0.016 8 0.043 4 0.001 8 274 11 TG-3-15 94.2 957.8 2 041.9 0.47 0.051 7 0.001 8 0.309 2 0.013 2 0.043 4 0.001 8 274 11 TG-3-16 21.8 133.7 448.8 0.30 0.050 0 0.001 9 0.298 9 0.013 5 0.043 3 0.001 8 274 11 TG-3-17 74.7 1 094.6 1 281.5 0.85 0.051 5 0.002 1 0.310 1 0.014 6 0.043 7 0.001 8 276 11 TG-3-18 42.2 397.3 860.0 0.46 0.051 5 0.001 9 0.308 1 0.014 0 0.043 4 0.001 8 274 11 TG-3-19 37.9 744.2 537.2 1.39 0.052 3 0.003 1 0.312 6 0.020 1 0.043 3 0.001 8 273 11 TG-3-20 22.9 184.4 435.1 0.42 0.050 0 0.001 8 0.309 2 0.013 4 0.044 8 0.001 8 283 11 TG-3-21 28.7 225.1 581.0 0.39 0.051 6 0.001 9 0.308 4 0.013 8 0.043 3 0.001 8 274 11 TG-3-22 124.2 4 611.9 1 706.3 2.70 0.051 3 0.002 0 0.308 4 0.014 4 0.043 6 0.001 8 275 11 TG-3-23 47.6 555.1 910.0 0.61 0.051 3 0.003 2 0.313 8 0.020 8 0.044 3 0.001 9 280 12 TG-3-24 178.6 2 543.6 3 706.5 0.69 0.051 1 0.001 8 0.306 6 0.013 2 0.043 5 0.001 8 275 11 TG-3-25 29.4 257.3 556.8 0.46 0.051 9 0.003 6 0.309 6 0.022 5 0.043 3 0.001 9 273 11 表 3 图古日格角闪石岩中锆石Lu-Hf同位素组成
Table 3. Zircon Lu-Hf isotopic compositions of hornblendite in Tugurige
点号 年龄(Ma) 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 2σ (176Hf/177Hf)i εHf(0) εHf(t) tDM1(Ma) fLu/Hf 1##-1 273 0.028 163 0.000 848 0.282 697 0.000 013 0.282 692 -2.7 3.2 784 -0.97 1##-2 273 0.027 582 0.000 835 0.282 648 0.000 011 0.282 644 -4.4 1.5 851 -0.97 1##-3 273 0.062 803 0.001 763 0.282 840 0.000 013 0.282 831 2.4 8.1 596 -0.95 1##-4 273 0.035 875 0.001 088 0.282 719 0.000 012 0.282 713 -1.9 3.9 757 -0.97 1##-5 273 0.041 498 0.001 236 0.282 731 0.000 013 0.282 725 -1.4 4.3 743 -0.96 1##-6 273 0.037 576 0.001 129 0.282 717 0.000 012 0.282 711 -1.9 3.9 760 -0.97 1##-7 273 0.026 663 0.000 813 0.282 681 0.000 013 0.282 677 -3.2 2.6 805 -0.98 1##-8 273 0.029 553 0.000 909 0.282 675 0.000 013 0.282 671 -3.4 2.4 815 -0.97 1##-9 273 0.026 114 0.000 811 0.282 662 0.000 011 0.282 658 -3.9 2.0 831 -0.98 1##-10 273 0.030 634 0.000 930 0.282 684 0.000 013 0.282 679 -3.1 2.7 803 -0.97 1##-11 273 0.021 323 0.000 653 0.282 650 0.000 012 0.282 646 -4.3 1.6 845 -0.98 1##-12 273 0.020 151 0.000 613 0.282 656 0.000 009 0.282 653 -4.1 1.8 835 -0.98 1##-13 273 0.065 582 0.001 881 0.282 852 0.000 015 0.282 842 2.8 8.5 580 -0.94 1##-14 273 0.029 505 0.000 880 0.282 680 0.000 012 0.282 676 -3.2 2.6 807 -0.97 1##-15 273 0.023 300 0.000 701 0.282 597 0.000 012 0.282 593 -6.2 -0.3 920 -0.98 注:εHf(0)=[(176Hf/177Hf)S/(176Hf/177Hf)CHUR, 0-1]×104;εHf(t)={[(176Hf/177Hf)S-(176Lu/177Hf)S×(eλt-1)]/[(176Hf/177Hf)CHUR, 0-(176Lu/177Hf)CHUR×(eλt-1)]-1}×104;tDM1=1/λ×{1+[(176Hf/177Hf)S-(176Hf/177Hf)DM)/(176Lu/177Hf)S-(176Lu/177Hf)DM]};fLu/Hf=(176Lu/177Hf)S/(176Lu/177Hf)CHUR-1;其中,(176Lu/177Hf)S和(176Hf/177Hf)S为样品测定值,(176Lu/177Hf)CHUR=0.032 200,(176Hf/177Hf)CHUR, 0=0.282 772;(176Lu/177Hf)DM=0.038 400,(176Hf/177Hf)DM=0.283 250;fCC、fS、fDM分别为大陆地壳、样品和亏损地幔的fLu/Hf,t为样品形成时间,λ=1.867×10-11 a-1. 表 4 图古日格角闪石岩主量元素(%)、微量元素(10-6)和稀土元素(10-6)分析结果
Table 4. Major elements, trace elements and rare elements analyses of the Tugurige hornblendite
样品 1##-1 1##-2 1##-3 1##-4 1##-5 1##-6 SiO2 43.46 43.54 45.30 45.29 46.30 43.33 Al2O3 16.15 17.57 15.84 11.02 10.87 15.52 TFe2O3 14.22 14.01 13.91 13.99 13.34 15.14 MgO 7.59 6.26 7.43 11.89 11.73 7.93 CaO 9.34 9.44 9.90 11.35 11.10 10.25 Na2O 2.10 2.29 2.43 1.88 1.86 2.20 K2O 2.36 2.11 1.37 0.99 0.97 1.73 MnO 0.21 0.19 0.21 0.20 0.20 0.21 TiO2 1.52 1.49 1.47 1.89 1.85 1.67 P2O5 0.44 0.50 0.39 0.05 0.05 0.36 LOI 2.56 2.54 1.72 1.42 1.67 1.62 Total 99.95 99.94 99.97 99.97 99.94 99.96 Mg# 51.39 46.95 51.41 62.74 63.53 50.92 M/F 1.04 0.87 1.04 1.66 1.72 1.02 La 20.0 18.3 19.7 12.5 13.7 21.4 Ce 58.8 52.2 52.0 34.8 36.5 56.1 Pr 8.91 7.74 8.04 5.74 5.80 8.90 Nd 37.4 34.6 38.1 29.5 28.5 42.2 Sm 7.57 6.93 8.70 7.51 7.40 9.41 Eu 1.80 1.83 2.13 1.85 1.84 2.46 Gd 7.06 6.32 7.82 7.10 6.58 8.47 Tb 1.15 1.05 1.27 1.16 1.14 1.42 Dy 5.87 5.32 6.39 6.13 6.01 6.89 Ho 1.12 1.05 1.14 1.10 1.00 1.24 Er 3.27 3.11 3.13 2.93 2.69 3.50 Tm 0.51 0.47 0.47 0.44 0.41 0.53 Yb 2.87 2.82 2.67 2.47 2.34 3.09 Lu 0.45 0.42 0.39 0.35 0.34 0.45 REE 156.33 141.74 151.56 113.23 113.91 165.51 LREE 134.48 121.60 128.67 91.90 93.74 140.37 HREE 21.85 20.14 22.89 21.33 20.17 25.14 δEu 0.74 0.83 0.77 0.76 0.79 0.83 LREE/HREE 6.15 6.04 5.62 4.31 4.65 5.58 (La/Yb)N 4.70 4.38 4.97 3.41 3.95 4.67 (La/Sm)N 1.66 1.66 1.42 1.05 1.16 1.43 (Gd/Lu)N 1.95 1.87 2.49 2.52 2.41 2.34 V 317 290 289 439 480 368 Cr 124.0 63.2 94.2 272.0 268.0 87.2 Co 37.8 30.7 38.5 56.0 53.9 46.1 Ni 21.3 18.8 15.8 35.3 35.1 15.9 Ga 33.0 33.3 23.6 17.6 17.2 24.8 Rb 93.5 105.0 37.4 20.2 16.5 55.3 Sr 576 882 569 295 249 573 Y 35.2 32.1 31.1 29.1 27.8 34.3 Ba 303 540 710 1105 239 497 Pb 9.64 13.00 6.14 4.47 4.70 6.64 Th 2.54 2.89 2.23 1.50 3.01 2.41 U 0.72 0.91 0.86 0.45 0.97 0.89 Nb 6.55 6.27 6.03 5.34 5.49 6.74 Ta 0.284 0.266 0.320 0.325 0.365 0.320 Zr 116.0 152.0 96.2 60.1 67.0 115.0 Hf 3.64 4.20 3.49 2.67 2.93 3.89 La/Sm 2.64 2.64 2.26 1.66 1.85 2.27 Sr/Nd 15.40 25.49 14.93 10.00 8.74 13.58 -
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