Tectonic Setting of Hadahushu Mafic Intrusion in Urad Zhongqi Area, Inner Mongolia: Implications for Early Subduction History of Paleo-Asian Ocean Plate
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摘要: 内蒙古乌拉特中旗地区在大地构造上横跨华北板块边缘和兴蒙造山带,区域基性岩体多以小岩株形式产出,侵入时代缺少可靠的资料.对乌拉特中旗哈达呼舒基性岩进行锆石U-Pb年代学、岩石地球化学以及Hf同位素研究,对其岩石成因和古亚洲洋板块俯冲作用的开始时间给予制约.哈达呼舒基性岩锆石LA-ICP-MS U-Pb定年结果表明,该岩体形成于晚寒武世(513±2 Ma).在地球化学上,它们属于钙碱性系列,富集大离子亲石元素(如K、Rb、Ba),亏损高场强元素(如Nb、Ta、Zr、Ti)和LREE.岩石的εHf(t)值为14.15~15.03,单阶段模式年龄(TDM1)为518~556 Ma,与岩石原岩形成时代513 Ma相近,认为其原始岩浆起源于亏损岩石圈地幔.综合区域同时代火成岩的研究成果,认为哈达呼舒基性岩体形成于古亚洲洋俯冲消减环境.Abstract: The Urad Zhongqi area of western Inner Mongolia crosses the North China Plate margin and Xing'an-Mongolia Orogenic Belt, which distributed regional basic rock massif occurred as small stocks, and a lack of reliable data of intrusion age. This paper reports LA-ICP-MS zircon U-Pb dating, geochemical and Hf isotopic data of Hadahushu mafic intrusion in Urad Zhongqi area, with the aim of constraining its petrogenesis and the beginning time of subduction of the Paleo-Asian oceanic plate. LA-ICP-MS U-Pb dating results of zircons from the mafic intrusion indicate that the intrusion formed at the Late Cambrian (513±2 Ma). The geochemical characteristics of these rocks indicate that they are the calc-alkaline series, and are characterized by enrichment in LILE (such as K, Ba, Rb), relatively depleted in HFSE (such as Nb, Ta, Zr, Ti) and LREE. The εHf(t) values and one-stage model ages (TDM1) of zircons from the rock vary from 14.15 to 15.03 and from 518 to 556 Ma, respectively. These characteristics suggest that the primary magma was derived from the depleted lithospheric mantle source. Based on the previous study, we conclude that the formation of mafic intrusion was related to the subduction of the Paleo-Asian oceanic plate.
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Key words:
- geochronology /
- zircon Hf isotope /
- mafic intrusion /
- Urad Zhongqi /
- geochemistry
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图 1 研究区地质略图
图a据Safonova and Santosh(2014);图b据Xiao et al.(2009);图c据矿区资料;胡安新(2014).1.上白垩统;2.温都尔庙群;3.中元古界宝音图群;4.下志留统花岗闪长岩;5.下志留统钠长花岗岩;6.寒武系基性岩体;7.地层界限;8.断层;9.取样点
Fig. 1. Geological sketch of the studied area
图 4 岩石的TiO2-SiO2图解(a)和(FeOT+TiO2)-Al2O3-MgO三角图(b)
PK.橄榄质科马提岩; BK.玄武质科马提岩; HMT.高镁拉班玄武岩; HFT.高铁拉班玄武岩; TA.拉斑质安山岩; TD.拉斑质英安岩; TR.拉斑质流纹岩; CB.钙碱性玄武岩; CA.钙碱性安山岩; CD.钙碱性英安岩;CR.钙碱性流纹岩;图b据Jensen(1976)
Fig. 4. TiO2-SiO2 diagram (a) and (FeOT+TiO2)-Al2O3-MgO diagram (b) of the amphibolite rocks
图 5 岩石稀土元素球粒陨石标准化配分图解(a)和微量元素原始地幔标准化蛛网图(b)
a.标准化值据Boynton(1984); b.标准化值据Sun and Mcdonough(1989)
Fig. 5. Chondrite-normalized REE distribution patterns and primitive mantle-normalized trace element spider diagrams of amphibolite
图 7 岩石的Ta/Yb-Th/Yb图解(a)和Nb/Yb-Th/Yb图解(b)
Fig. 7. Ta/Yb-Th/Yb diagram (a) and Nb/Yb-Th/Yb diagram (b) of the amphibolite rocks
表 1 岩石中锆石LA-ICP-MS U-Pb同位素分析结果
Table 1. LA-ICPMS zircon U-Pb analyses of the rocks
样品 Th
(10-6)U
(10-6)Th/U 207Pb/206Pb 207Pb/235U 206Pb/238U 206Pb/238U Ratio 1σ Ratio 1σ Ratio 1σ t(Ma) 1σ(Ma) HDHS-1 1 143 1 899 0.602 17 0.059 68 0.001 29 0.682 87 0.014 49 0.082 61 0.000 88 512 5 HDHS-2 1 089 1 462 0.744 48 0.058 33 0.001 42 0.668 02 0.015 97 0.082 57 0.000 66 511 4 HDHS-3 231 311 0.742 66 0.057 96 0.001 85 0.658 70 0.019 94 0.082 40 0.000 63 510 4 HDHS-4 111 160 0.691 17 0.058 39 0.002 97 0.652 92 0.033 17 0.082 28 0.001 06 510 6 HDHS-5 380 505 0.753 24 0.058 19 0.001 53 0.667 03 0.017 08 0.083 00 0.000 62 514 4 HDHS-6 1 875 2 303 0.814 27 0.059 12 0.001 16 0.685 50 0.012 32 0.084 03 0.000 78 520 5 HDHS-7 555 572 0.970 06 0.059 45 0.003 97 0.660 37 0.024 56 0.083 13 0.000 84 515 5 HDHS-8 421 803 0.523 82 0.058 09 0.001 47 0.664 64 0.016 99 0.082 49 0.000 74 511 4 HDHS-9 717 1 553 0.461 97 0.057 11 0.001 17 0.655 38 0.013 37 0.082 64 0.000 58 512 3 HDHS-10 679 1 396 0.486 04 0.057 13 0.001 11 0.658 81 0.012 88 0.082 96 0.000 59 514 4 HDHS-11 781 1 380 0.565 63 0.057 28 0.001 26 0.654 49 0.014 57 0.082 23 0.000 76 509 5 HDHS-12 769 1 205 0.638 25 0.056 86 0.001 44 0.655 49 0.016 22 0.082 87 0.000 57 513 3 HDHS-13 0.33 296 0.001 12 0.063 42 0.002 08 0.538 65 0.016 47 0.061 68 0.000 64 386 4 HDHS-14 0.06 178 0.000 36 0.057 24 0.002 76 0.484 91 0.023 21 0.061 55 0.000 71 385 4 表 2 岩石主量元素(%)、微量和稀土元素(10-6)含量及有关参数
Table 2. Major (%), trace and rare element (10-6) content and parameter of the rocks
样品 HDHS-Y1 HDHS-Y2 HDHS-Y3 HDHS-Y4 HDHS-Y5 HDHS-Y6 SiO2 48.64 48.35 47.40 49.82 47.02 49.17 TiO2 0.29 0.26 0.31 0.28 0.20 0.30 Al2O3 16.88 16.70 16.83 17.31 17.65 17.11 Fe2O3 1.34 1.40 1.46 1.23 1.29 1.37 FeO 6.40 6.55 6.82 6.00 6.75 6.39 MnO 0.16 0.16 0.18 0.15 0.16 0.15 MgO 8.63 9.16 9.28 8.29 9.63 8.71 CaO 12.77 12.44 13.29 11.57 12.17 11.35 Na2O 2.04 1.92 1.48 2.62 1.90 2.18 K2O 0.39 0.50 0.40 0.46 0.72 0.80 P2O5 0.02 0.05 0.05 0.03 0.03 0.04 LOI 1.68 1.71 1.68 1.55 1.69 1.69 Mg# 67 68 67 68 68 67 La 0.79 0.98 0.87 1.05 0.53 2.09 Ce 1.95 2.08 2.16 2.36 1.28 3.94 Pr 0.33 0.34 0.34 0.41 0.22 0.61 Nd 1.84 1.89 2.01 2.15 1.24 2.82 Sm 0.66 0.70 0.76 0.84 0.42 0.76 Eu 0.29 0.30 0.36 0.35 0.24 0.34 Gd 0.92 0.87 1.10 1.10 0.65 0.97 Tb 0.22 0.21 0.25 0.28 0.14 0.25 Dy 1.48 1.29 1.30 1.54 1.07 1.54 Ho 0.29 0.27 0.29 0.33 0.20 0.27 Er 0.84 0.75 0.90 1.08 0.60 0.82 Tm 0.13 0.11 0.15 0.17 0.10 0.15 Yb 0.83 0.77 0.84 1.05 0.60 0.87 Lu 0.14 0.12 0.12 0.14 0.09 0.12 Y 8.78 7.01 8.45 10.50 5.91 8.83 ∑REE 10.70 10.70 11.40 12.90 7.37 15.50 LREE 5.85 6.29 6.49 7.16 3.92 10.57 HREE 4.84 4.39 4.94 5.69 3.45 4.98 LREE/HREE 1.21 1.43 1.31 1.26 1.14 2.12 LaN/YbN 0.69 0.91 0.74 0.72 0.63 1.73 δEu 1.14 1.18 1.20 1.10 1.42 1.23 Rb 8.26 12.60 7.99 10.80 27.40 23.10 Ba 56.4 94.7 68.0 68.4 120.0 171.0 Th 0.11 0.11 0.10 0.14 0.08 0.51 U 0.13 0.10 0.18 0.18 0.15 0.22 Nb 0.186 0.171 0.202 0.220 0.106 1.310 Ta 0.021 0.014 0.016 0.019 0.009 0.094 Sr 124 128 124 142 127 140 Zr 5.17 5.20 5.58 5.55 5.19 11.70 Hf 0.285 0.283 0.333 0.315 0.217 0.506 Li 13.4 14.1 16.8 14.3 19.3 18.1 Be 0.28 0.30 0.97 0.33 0.26 0.36 Sc 36.5 37.7 41.8 36.5 35.7 35.1 V 151 153 184 151 135 158 Cr 146 165 179 139 150 150 Co 41.9 46.4 52.0 43.3 51.7 48.7 Ni 64.1 74.7 84.3 70.8 88.2 77.9 Cu 34.0 24.9 27.0 26.9 20.2 23.2 Zn 34.8 40.7 50.0 36.1 41.3 41.1 Ga 8.47 8.37 8.98 8.33 9.15 10.20 Mo 0.28 0.20 0.24 0.27 0.16 0.26 Cd 0.07 0.08 0.11 0.06 0.06 0.07 In 0.03 0.02 0.03 0.03 0.02 0.03 Sb 0.15 0.17 0.16 0.19 0.18 0.20 Cs 0.36 0.58 0.36 0.49 1.36 0.75 W 0.60 0.17 0.19 0.17 0.14 0.24 Tl 0.08 0.12 0.10 0.11 0.27 0.19 Pb 4.11 5.11 5.45 4.99 5.05 6.60 Bi 0.13 0.17 0.29 0.09 0.18 0.19 Nb/U 1.48 1.80 1.10 1.21 0.70 6.09 Ta/U 0.17 0.15 0.09 0.10 0.06 0.44 Nb/La 0.23 0.18 0.23 0.21 0.20 0.63 Ce/Pb 0.47 0.41 0.40 0.47 0.25 0.60 La/Sm 1.21 1.40 1.14 1.25 1.26 2.75 Zr/Y 0.59 0.74 0.66 0.53 0.88 1.33 La/Nb 4.26 5.71 4.28 4.77 4.95 1.60 (Th/Nb)N 9.26 10.74 8.13 9.95 12.76 6.31 Ta/Yb 0.03 0.02 0.02 0.02 0.02 0.11 Zr/Nb 27.80 30.40 27.60 25.20 49.00 8.93 注:Mg#=100×(MgO/40.31)/(MgO/40.31+Fe2O3T×2/159.7). 表 3 岩石中锆石Hf同位素分析结果
Table 3. LA-ICPMS zircon U-Pb analyses of the rocks
样品 t(Ma) 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 1σm εHf(0) εHf(t) 1σ TDM1(Hf) fLu/Hf HDHS-1 513 0.100 76 0.002 605 0.282 902 0.000 020 4.60 15.03 0.90 518 -0.92 HDHS-2 513 0.089 36 0.002 711 0.282 894 0.000 029 4.30 14.69 1.23 532 -0.92 HDHS-3 513 0.082 90 0.002 103 0.282 882 0.000 023 3.90 14.50 0.99 540 -0.94 HDHS-4 513 0.089 07 0.002 370 0.282 882 0.000 022 3.88 14.39 0.98 545 -0.93 HDHS-5 513 0.109 52 0.002 791 0.282 901 0.000 026 4.56 14.92 1.09 523 -0.92 HDHS-7 513 0.079 52 0.001 900 0.282 892 0.000 016 4.25 14.92 0.79 523 -0.94 HDHS-8 513 0.064 13 0.001 874 0.282 883 0.000 022 3.93 14.61 0.99 535 -0.94 HDHS-9 513 0.127 54 0.003 184 0.282 883 0.000 027 3.91 14.15 1.13 556 -0.90 HDHS-10 513 0.048 34 0.001 260 0.282 882 0.000 021 3.89 14.77 0.94 528 -0.96 -
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