Geochronology, Geochemistry and Zircon Hf Isotopes of the Tanjianshan Granite Porphyry Intrusion in Dachaidan Area of the North Margin of Qaidam Basin, NW China
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摘要: 为了研究柴北缘大柴旦地区在华力西期构造演化特征,对大柴旦地区滩间山花岗斑岩进行了锆石U-Pb年代学、岩石地球化学以及Hf同位素的研究.花岗斑岩中锆石LA-ICP-MS U-Pb定年结果表明,该岩体形成于晚泥盆世(356.0±2.8 Ma,MSWD=0.53).地球化学分析显示花岗斑岩属于中钾钙碱性-钙碱性系列,A/CNK值为0.97~1.10,属弱过铝质,为I型花岗岩,富集大离子亲石元素(如K、Ba、Rb)和轻稀土元素(LREE)以及Th、U,相对亏损高场强元素(如Ta、Nb、Ti、P).岩石的εHf(t)值和二阶段模式年龄(TDM2)分别介于±5.43~±8.38和1 017~1 284 Ma之间.上述特征表明,滩间山花岗斑岩的原始岩浆源于中元古代新增生陆壳的部分熔融.综合区域地质演化背景,认为滩间山花岗斑岩形成于柴达木地块与南祁连地块碰撞后伸展构造环境.Abstract: In order to research the Variscan tectonic evolution features of Dachaidan region in North Qaidam, this paper presents LA-ICP-MS zircon U-Pb dating, geochemical and Hf isotopic data of the granite porphyry from Tanjianshan intrusion in Dachaidan region, with the aim of constraining its formation time, petrogenesis and the regional tectonic setting. The LA-ICP-MS U-Pb dating results of zircons from the granite porphyry indicate that the intrusion formed in the Late Devonian Epoch (356.0±2.8 Ma, MSWD=0.53). Geochemically, these rocks fall into the calc-alkaline to middle-K calc-alkaline series, with an A/CNK ratio of 0.97-1.10, which are weakly peraluminous granites, being of the characteristics of I type granitoids, enriched in LILE(such as K, Ba, Rb), LREE, Th and U, relatively depleted in HFSE (such as Ta, Nb, Ti, P). The εHf(t) values of the granite porphyry vary from ±5.43 to ±8.38, and two-stage model ages (TDM2) range from 1 017 to 1 284 Ma. These characteristics suggest that the primary magma was derived from the remelting of juvenile crustal materials in Mesoproterozoic. In context of its regional geological background, we conclude the granite porphyry from Tanjianshan intrusion were formed extensional tectonic setting after the collision between Qaidam block and Qilian block.
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Key words:
- zircon U-Pb chronology /
- Zircon Hf isotopes /
- Tanjianshan /
- geochemistry /
- geochronology
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图 5 岩石TAS图解(a)和K2O-SiO2图解(b)
a.分界线上方为碱性,下方为亚碱性据Irvine and Baragar(1971);b.据Peccerillo and Taylor(1976)
Fig. 5. TAS diagram (a) and K2O-SiO2 (b) diagram of the granite porphyry
图 7 花岗斑岩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. 7. Chondrite-normalized REE distribution patterns (a) and primitive mantle-normalized trace element spider diagrams of the granite porphyry (b)
表 1 花岗斑岩中锆石U-Pb同位素分析结果
Table 1. Zircon U-Pb analyses of the granite porphyry
样品 Th U Th/U 207Pb/206Pb 207Pb/235U 206Pb/238U 206Pb/238U 10-6 比值 1σ 比值 1σ 比值 1σ 年龄(Ma) 1σ XJG-N1 408 1023 0.40 0.073 385 0.002 213 0.421 631 0.017 651 0.056 094 0.000 712 352 4 XJG-N2 202 451 0.45 0.064 487 0.002 807 0.414 923 0.021 425 0.056 369 0.000 752 354 4 XJG-N3 189 426 0.44 0.055 518 0.003 134 0.425 024 0.021 744 0.056 384 0.000 857 354 6 XJG-N4 41 88 0.47 0.064 909 0.005 129 0.424 216 0.014 781 0.056 387 0.000 653 354 7 XJG-N5 203 403 0.50 0.076 04 0.002 895 0.415 678 0.019 986 0.056 414 0.000 656 354 4 XJG-N6 198 444 0.45 0.052 461 0.002 33 0.407 076 0.017 546 0.056 626 0.000 838 355 5 XJG-N7 209 504 0.41 0.051 271 0.002 702 0.402 974 0.021 623 0.056 732 0.000 757 356 4 XJG-N8 205 493 0.42 0.055 962 0.001 978 0.408 925 0.014 645 0.056 826 0.000 588 356 3 XJG-N9 335 804 0.42 0.056 416 0.001 648 0.414 312 0.012 994 0.057 268 0.000 740 359 4 XJG-N10 246 565 0.44 0.057 981 0.002 648 0.414 513 0.021 865 0.057 832 0.000 747 362 4 XJG-N11 102 245 0.42 0.059 846 0.003 280 0.425 621 0.025 976 0.057 889 0.000 785 363 6 表 2 滩间山花岗斑岩主量元素、稀土元素和微量元素含量及有关参数
Table 2. Major, REE and trace element content and parameter of the granite porphyry in Tanjianshan
样品 XJG-Y1-1 XJG-Y1-2 XJG-Y1-3 XJG-Y1-4 XJG-Y1-5 XJG-Y1-6 XJG-Y1-7 XJG-Y1-8 SiO2 68.64 71.61 70.08 68.72 71.72 69.52 69.27 71.05 TiO2 0.29 0.32 0.30 0.31 0.32 0.31 0.30 0.31 Al2O3 14.55 15.39 14.53 14.72 15.10 14.85 14.62 15.08 Fe2O3 0.82 0.86 0.93 0.94 1.12 0.96 1.02 0.95 FeO 1.43 1.33 1.23 1.25 1.06 1.23 1.31 1.33 MnO 0.07 0.06 0.07 0.07 0.04 0.06 0.08 0.07 MgO 0.83 0.73 0.73 0.80 0.66 0.82 0.85 0.74 CaO 3.27 2.98 2.59 2.91 2.88 2.37 2.64 2.68 Na2O 4.30 4.32 4.51 4.21 4.28 4.24 4.20 4.63 K2O 1.85 2.08 1.77 2.02 2.10 1.98 1.99 1.90 P2O5 0.08 0.08 0.08 0.08 0.09 0.08 0.08 0.08 LOI 3.77 2.11 3.02 3.61 2.05 3.11 3.38 2.23 Total 99.91 101.86 99.83 99.65 101.43 99.53 99.73 101.04 ALK 6.15 6.39 6.29 6.24 6.39 6.22 6.19 6.52 Na2O/K2O 2.33 2.08 2.54 2.08 2.04 2.14 2.12 2.44 A/CNK 0.97 1.04 1.03 1.02 1.04 1.10 1.05 1.04 Mg# 42.09 39.70 40.13 41.89 37.58 42.60 41.95 39.04 La 11.28 6.63 10.42 12.38 13.11 13.97 12.20 11.14 Ce 25.00 16.35 22.24 26.85 27.14 28.96 25.76 24.26 Pr 2.70 1.83 2.58 2.95 3.05 3.27 3.02 2.68 Nd 11.09 7.65 10.62 11.02 12.32 12.98 12.23 9.06 Sm 2.13 1.41 2.16 2.30 2.41 2.43 2.35 2.07 Eu 0.60 0.34 0.54 0.59 0.53 0.67 0.63 0.51 Gd 1.77 1.05 1.75 1.77 2.05 1.98 2.04 1.72 Tb 0.28 0.17 0.28 0.25 0.30 0.28 0.31 0.24 Dy 1.54 0.97 1.59 1.41 1.74 1.64 1.66 1.33 Ho 0.23 0.15 0.23 0.21 0.25 0.24 0.26 0.20 Er 0.72 0.49 0.73 0.62 0.80 0.72 0.77 0.61 Tm 0.09 0.06 0.10 0.08 0.09 0.10 0.10 0.07 Yb 0.59 0.43 0.67 0.61 0.68 0.65 0.66 0.55 Lu 0.08 0.06 0.10 0.08 0.09 0.09 0.10 0.07 Y 7.12 3.04 7.31 6.15 7.53 7.65 8.11 4.89 ΣREE 58.10 37.59 54.01 61.12 64.56 67.98 62.09 54.51 LREE 52.80 34.21 48.56 56.09 58.56 62.28 56.19 49.72 HREE 5.30 3.38 5.45 5.03 6.00 5.70 5.90 4.79 LREE/HREE 9.96 10.12 8.91 11.15 9.76 10.93 9.52 10.38 LaN/YbN 12.89 10.40 10.49 13.68 13.00 14.49 12.46 13.66 δEu 0.92 0.82 0.82 0.86 0.71 0.91 0.86 0.80 δCe 1.06 1.11 1.01 1.04 1.00 1.00 0.99 1.04 Rb 87.58 92.35 94.15 96.31 88.98 94.12 98.78 101.12 Ba 207.90 228.20 195.30 325.20 277.80 241.80 249.30 221.30 Th 5.97 2.40 5.78 6.46 6.81 7.17 6.62 6.22 U 1.76 1.74 2.24 1.84 2.65 2.33 2.15 2.13 Nb 2.57 2.62 2.63 2.54 2.74 2.69 2.67 2.60 Ta 0.68 0.71 0.72 0.76 0.69 0.56 0.69 0.74 Sr 215.10 137.00 180.40 174.10 174.50 195.60 217.10 173.00 Nd 11.09 7.65 10.62 11.02 12.32 12.98 12.23 9.06 Zr 55.47 62.07 107.90 48.97 99.63 67.24 95.57 49.55 Hf 1.57 1.79 2.86 1.46 2.54 1.87 2.50 1.54 Nb/Ta 3.78 3.69 3.65 3.34 3.97 4.80 3.87 3.51 Rb/Sr 0.41 0.67 0.52 0.55 0.51 0.48 0.45 0.58 Hf/Th 0.26 0.75 0.50 0.23 0.37 0.26 0.38 0.25 La/Nb 4.40 2.53 3.96 4.88 4.78 5.19 4.57 4.29 注:主量元素单位为10-2;微量、稀土元素单位为10-6. 表 3 滩间山花岗斑岩锆石Hf同位素分析结果
Table 3. LA-ICPMS zircon U-Pb analyses of the granite porphyry in Tanjianshan
样品 年龄(Ma) 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 1σ εHf(t) TDM1(Hf)(Ma) TDM2(Hf)(Ma) fLu/Hf XJG-N1-01 352 0.054 353 0.001 117 0.282 797 0.000 026 8.38 647 1 017 -0.97 XJG-N1-02 354 0.020 430 0.000 414 0.282 783 0.000 024 8.08 655 1 044 -0.99 XJG-N1-03 354 0.034 401 0.000 712 0.282 710 0.000 021 5.43 762 1 284 -0.98 XJG-N1-04 354 0.025 633 0.000 574 0.282 710 0.000 036 5.46 759 1 281 -0.98 XJG-N1-05 354 0.038 097 0.000 767 0.282 781 0.000 018 7.91 664 1 060 -0.98 XJG-N1-06 355 0.033 948 0.000 720 0.282 755 0.000 022 7.05 699 1 139 -0.98 XJG-N1-07 356 0.033 248 0.000 728 0.282 763 0.000 019 7.32 689 1 115 -0.98 XJG-N1-08 356 0.048 840 0.001 110 0.282 745 0.000 017 6.60 722 1 180 -0.97 XJG-N1-09 359 0.028 541 0.000 880 0.282 754 0.000 018 7.05 704 1 142 -0.97 XJG-N1-10 362 0.031 018 0.000 780 0.282 764 0.000 044 7.51 688 1 102 -0.98 XJG-N1-11 363 0.042 696 0.001 172 0.282 775 0.000 018 7.82 679 1 075 -0.96 -
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