Geochronology and Geochemistry of Granite in Tulasu Pluton in West Tianshan, and Its Geological Significance
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摘要: 吐拉苏岩体位于西天山吐拉苏盆地的东北缘,由石英闪长玢岩、辉石闪长玢岩和花岗岩组成,其中花岗岩主要为花岗闪长玢岩和花岗斑岩.它们表现出高硅、高铝、富碱的特征,里特曼指数(σ)=1.61~3.18,A/CNK=1.00~1.09,A/NK=1.07~1.68,为准铝质-弱过铝质高钾钙碱性花岗岩;相对富集Rb、Th、U等大离子亲石元素,明显亏损Nb、Ta、Sr、P、Ti等元素;轻重稀土分馏明显,(La/Yb)N=7.48~12.12、中等Eu负异常(δEu=0.47~0.62),无Ce异常.但花岗斑岩较花岗闪长玢岩碱含量更高,更加接近准铝质钾玄岩系列,Sr、P、Ti等元素的亏损程度更强,且轻稀土更富集,可能说明花岗斑岩中壳源物质含量增加.锆石LA-ICP-MS U-Pb定年研究获得花岗斑岩的侵位年龄为305.9±5.9 Ma.锆石Hf同位素组成显示,εHf(t)值介于0.4~8.7,表明花岗岩的岩浆源区有幔源物质的加入;TDM2值介于766~1 294 Ma,表明岩浆源区为中元古代-新元古代新生地壳.综合吐拉苏岩体中两类花岗岩的地质、地球化学特征、年代学和区域地质背景,认为从花岗闪长玢岩到花岗斑岩结晶分异增强、壳源物质的贡献增大,花岗岩形成于后碰撞环境,岩浆源区为中元古代-新元古代新生地壳,但有不同比例幔源物质的加入.Abstract: Tulasu pluton in Chinese West Tianshan is located in the northeastern of Tulasu basin, composed of three lithofacies, i. e. quartzdiorite, pyroxene diorite and granite. The granites are composed of granodiorite porphyrite and granite porphyry, characterized by high silicon, high aluminum, enrichment of alkali, Rittman index(σ)=1.61-3.18, A/CNK=1.00-1.09, A/NK=1.07-1.68, belonging to metaluminous-weakly peraluminous high-K calc-alkaline granite. They are relatively enriched in LILEs (Rb, Th, U), extremely poor in Nb, Ta, Sr, P, Ti, etc., obviously fractionated in LREE and HREE, (La/Yb)N=7.48-12.12, showing a medium negative Eu anomaly and no Ce anomaly, δEu=0.47-0.62. But granite porphyry has higher alkali content, more close to shoshonite series and Sr, P, Ti strongly negative, indicating increased involvement of crustal materials. Zircon LA-ICP-MS U-Pb dating for the granite yields an age of 305.9±5.9 Ma. Analyses on zircon Hf isotopic compositions yield positive εHf(t) values varying from +0.4 to +8.7, implying that the involvement of mantle-derived magmatic materials during the formation of granite; TDM2 varies from 766 to 1 294 Ma, showing that magma was derived from Proterozoic-Neoproterozoic crust. By comparison, it is concluded that fractional crystallization enhanced, involvement of crustal materials increased from granodiorite to granite porphyry. The granite was formed in post-collisional setting.
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Key words:
- Tulasu pluton /
- granite /
- zircon U-Pb age /
- geochemistry /
- post-collision
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图 1 西天山区域地质略图(a)和吐拉苏盆地区域地质图(b)
图a据Wang et al.(2011)修改; 图b据新疆地质矿产局(1993)修改
Fig. 1. Regional geological map of Chinese West Tianshan (a) and regional geological map of the Tulasu basin (b)
图 4 吐拉苏岩体中花岗岩的TAS分类图解
据Middlemost(1994); Irvine and Baragar(1971)
Fig. 4. TAS diagram of the granite in the Tulasu pluton
图 5 吐拉苏岩体中花岗岩的K2O-SiO2图(a)和A/NK-A/CNK图(b)
图a据Ewart(1989);图b据Maniar and Piccoli(1989)
Fig. 5. K2O-SiO2 diagram (a) and A/NK-A/CNK diagram (b) of the granite in the Tulasu pluton
图 6 吐拉苏岩体中花岗岩的微量元素原始地幔标准化蛛网图(a)和球粒陨石标准化稀土元素配分模式图(b)
Fig. 6. Primitive mantle-normalized spider diagrams (a) and chondrite-normalized REE patterns (b) of granite in the Tulasu pluton
图 8 西天山地区部分侵入岩的锆石εHf(t)-t图解
数据来源:杨蓉等(2017), 李宁波等(2013), 黄栋等(2017).底图据黄河等(2015)
Fig. 8. Zircon εHf(t)-t diagram of some intrusions in the West Tianshan
图 11 吐拉苏岩体中花岗岩微量元素构造环境判别图解
VAG.火山弧花岗岩; syn-COLG.同碰撞花岗岩; WPG.板内花岗岩; ORG.洋中脊花岗岩; Post-COLG.后碰撞花岗岩.底图据Pearce et al.(1984); Pearce (1996)
Fig. 11. Tectonic discrimination diagrams of the granite trace elements in the Tulasu pluton
表 1 吐拉苏岩体中花岗岩的主量元素(%)和微量元素(10-6)分析结果
Table 1. Major element (%) and trace element (10-6) compositions of granite in Tulasu pluton
样品号 16A-85 16A-86 16A-86R 16A-88 16A-89 岩石类型 花岗闪长玢岩 花岗斑岩 SiO2 69.43 70.83 70.88 73.43 73.52 TiO2 0.58 0.53 0.52 0.19 0.17 Al2O3 14.76 14.88 14.85 14.19 14.18 Fe2O3T 4.24 3.87 3.86 1.58 1.57 MnO 0.10 0.08 0.09 0.05 0.05 MgO 1.66 0.38 0.38 0.17 0.13 CaO 2.59 2.55 2.54 0.50 0.53 Na2O 3.04 3.33 3.36 4.51 4.52 K2O 3.48 3.42 3.41 5.33 5.30 P2O5 0.12 0.12 0.12 0.03 0.02 LOI 1.45 1.38 1.36 0.52 0.34 Na2O+K2O 6.52 6.75 6.77 9.84 9.82 K2O/Na2O 1.14 1.03 1.02 1.18 1.17 σ 1.61 1.64 1.64 3.18 3.16 A/CNK 1.09 1.08 1.07 1.00 1.00 A/NK 1.68 1.62 1.61 1.07 1.08 Li 32.8 14.7 14.6 30.3 26.7 Be 2.08 1.94 1.92 3.55 3.69 Sc 10.70 9.79 9.70 4.52 4.66 V 65.40 45.30 45.50 4.01 2.46 Cr 27.10 18.80 18.70 8.76 1.28 Co 31.0 28.1 27.7 26.9 30.5 Ni 22.60 14.70 14.60 6.03 1.63 Cu 16.30 10.60 10.60 2.51 2.16 Zn 54.2 45.3 44.6 50.1 53.4 Ga 17.6 17.1 17.0 18.9 19.0 Ge 1.52 1.53 1.54 1.45 1.46 Rb 115 117 115 190 191 Sr 185.0 228.0 226.0 31.3 28.9 Y 27.6 29.4 29.1 28.0 33.5 Zr 206 178 185 230 262 Nb 9.41 8.61 8.60 19.80 21.20 Cs 4.31 4.79 4.77 7.62 8.00 Ba 499 519 517 426 413 La 28.5 28.9 29.2 49.5 50.6 Ce 62.0 61.5 63.0 106.0 108.0 Pr 6.98 7.04 7.15 12.10 12.40 Nd 27.8 28.1 28.3 42.3 43.2 Sm 5.89 6.01 6.06 7.70 7.95 Eu 1.17 1.15 1.15 1.20 1.16 Gd 5.53 5.70 5.69 6.37 6.74 Tb 0.84 0.88 0.87 0.93 1.03 Dy 4.94 5.21 5.19 5.35 6.09 Ho 0.97 1.03 1.03 1.02 1.20 Er 2.79 2.93 2.93 2.92 3.49 Tm 0.41 0.43 0.43 0.44 0.53 Yb 2.63 2.77 2.77 2.93 3.45 Lu 0.39 0.41 0.41 0.43 0.51 Hf 5.55 5.02 5.20 6.94 7.68 Ta 0.87 0.83 0.84 1.65 1.69 Pb 20.3 32.8 32.6 29.4 31.0 Th 12.2 12.5 12.9 22.2 22.5 U 2.42 1.43 1.43 1.55 3.61 ΣREE 150.87 152.01 154.16 238.91 245.99 LREE/HREE 7.15 6.85 6.98 10.71 9.68 δEu 0.62 0.59 0.59 0.51 0.47 (La/Yb)N 7.77 7.48 7.57 12.12 10.52 表 2 吐拉苏岩体中花岗闪长玢岩LA⁃ICP⁃MS锆石U⁃Pb定年结果
Table 2. LA-ICP-MS zircon U-Pb data of granodiorite porphyry in Tulasu pluton
测点号 元素含量(10-6) Th/U 同位素比值 年龄(Ma) 206Pb 232Th 238U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 206Pb/238U 1σ 16A-86-01 25.79 64.92 126.36 0.51 0.051 94 0.004 49 0.360 84 0.030 42 0.050 38 0.001 09 316.9 6.68 16A-86-02 54.55 140.28 278.08 0.50 0.049 99 0.001 59 0.334 20 0.010 19 0.048 48 0.000 51 305.2 3.11 16A-86-03 27.62 61.66 143.31 0.43 0.054 75 0.002 40 0.360 93 0.015 35 0.047 80 0.000 61 301.0 3.76 16A-86-04 29.77 65.65 151.05 0.43 0.050 08 0.002 18 0.338 05 0.014 27 0.048 95 0.000 61 308.1 3.78 16A-86-05 22.89 52.36 117.62 0.45 0.054 07 0.002 58 0.361 83 0.016 75 0.048 53 0.000 66 305.5 4.08 16A-86-06 98.18 147.90 496.66 0.30 0.051 30 0.001 33 0.349 06 0.008 60 0.049 35 0.000 48 310.5 2.92 16A-86-07 44.12 107.82 226.34 0.48 0.057 92 0.002 07 0.389 10 0.013 38 0.048 72 0.000 56 306.7 3.47 16A-86-08 23.84 57.44 122.09 0.47 0.049 91 0.002 52 0.337 17 0.016 59 0.048 99 0.000 65 308.3 4.02 16A-86-09 28.73 69.97 151.15 0.46 0.053 83 0.002 41 0.355 74 0.015 43 0.047 93 0.000 63 301.8 3.88 16A-86-10 75.22 238.36 394.15 0.60 0.051 44 0.001 54 0.341 78 0.009 85 0.048 19 0.000 50 303.4 3.06 16A-86-11 47.35 106.90 246.12 0.43 0.054 03 0.001 80 0.362 35 0.011 64 0.048 64 0.000 54 306.1 3.30 16A-86-12 26.95 60.57 142.67 0.42 0.048 95 0.002 19 0.322 75 0.014 05 0.047 83 0.000 61 301.2 3.77 16A-86-13 58.89 92.50 305.40 0.30 0.053 03 0.001 50 0.357 34 0.009 69 0.048 88 0.000 50 307.6 3.05 表 3 吐拉苏岩体中花岗闪长玢岩的锆石Lu-Hf分析结果
Table 3. Zircon Lu-Hf isotopic compositions of granodiorite porphyry in Tulasu pluton
测点号 t(Ma) 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf σ εHf(t) σ tDM1(Ma) tDM2(Ma) fLu/Hf 16A-86-01 305 0.038 538 0.001 012 0.282 750 0.000 021 5.7 0.8 712 953 -0.97 16A-86-02 306 0.054 889 0.001 438 0.282 739 0.000 022 5.3 0.8 736 984 -0.96 16A-86-03 306 0.052 396 0.001 409 0.282 649 0.000 025 2.1 0.9 864 1 185 -0.96 16A-86-04 301 0.013 739 0.000 322 0.282 694 0.000 021 3.8 0.7 777 1 074 -0.99 16A-86-05 308 0.038 677 0.001 015 0.282 670 0.000 023 2.9 0.8 826 1 133 -0.97 16A-86-06 306 0.021 480 0.000 478 0.282 723 0.000 020 4.9 0.7 741 1 009 -0.99 16A-86-07 311 0.045 256 0.001 191 0.282 833 0.000 025 8.7 0.9 598 766 -0.96 16A-86-08 307 0.045 879 0.001 410 0.282 600 0.000 034 0.4 1.2 934 1 294 -0.96 16A-86-09 306 0.048 069 0.001 326 0.282 815 0.000 023 8.0 0.8 626 812 -0.96 16A-86-10 306 0.034 753 0.000 922 0.282 697 0.000 024 3.9 0.8 786 1 072 -0.97 -
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