Zircon U-Pb age and petrogenesis of tonalite-quartz diorite in the Shibanjing area, central Beishan orogenic belt, and its constraint on subduction of the ancient oceanic basin
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摘要:
北山造山带中部石板井地区出露早古生代英云闪长岩-石英闪长岩体。用LA-ICP-MS技术测得该岩体石英闪长岩中锆石的206Pb/238U年龄为464.4±2.1Ma。岩石地球化学分析结果显示，岩石属钙碱性至高钾钙碱性、准铝质I型花岗岩。通过岩石成因分析，英云闪长岩-石英闪长岩体为来自地壳的岩浆与来自深部的亏损地幔岩浆，在高压（> 1.5GPa）、低温（719～792℃）条件下，经不均匀混合作用形成，同时有俯冲流体的加入，残留相为石榴子石+金红石（无角闪石）。岩石富集Rb、Ba、Th、U、K等大离子亲石元素，亏损Ta、Nb、P、Ti等高场强元素，显示出典型岛弧型花岗岩的地球化学特征。微量元素构造环境判别图进一步证明，岩体形成于岛弧环境。与南侧的红柳河-牛圈子-洗肠井古生代洋盆构成“沟-弧”体系，表明红柳河-牛圈子-洗肠井古洋盆在中奥陶世晚期已经向北俯冲，该洋盆闭合时限应晚于中奥陶世。
Abstract:The Early Paleozoic Yingyun diorite-quartz diorite is exposed in the Shibanjing area of central Beishan orogenic belt. In this paper, LA-ICP-MS zircon U-Pb dating of the rock mass was conducted, and the 206Pb/238U average age is 464.4±2.1Ma. According to geochemical data, the rocks belong to the calc-alkaline to high potassium calc-alkaline, quasi-aluminous I type granite. In view of its petrogenesis, the authors hold that the magma source of tonalite-quartz diorite was formed by mixed magma from the crust and magma from the depleted mantle under the conditions of high pressure(>1.5GPa) and low temperature(719～792℃), with the residual minerals of garnet+ruble (without amphibole). Moreover, trace element composition is characterized by enrichment of large ion lithophile ele-ments (LILEs), such as Rb, Ba, Th, U and K, and depletion of high field strength elements(HFSEs), Ta, Nb, P, and Ti, showing the geo-chemical features of the typical island arc granite. It is further proved that the rock mass was formed in an island arc environment on the discriminant map of trace elements tectonic environment. It constitutes "oceanic trench-arc" system with the south side of the Hongli-uhe-Niuquanzi-Xichangjing Paleozoic oceanic basin, indicating that the Hongliuhe-Niuquanzi-Hidangjing Paleozoic basin had sub-ducted northward in the late Middle Ordovician. The closure time of the ocean basin should be later than Middle Ordovician.
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Keywords:
- Beishan orogenic belt /
- Shibanjing /
- tonalite-quartz diorite /
- zircon U-Pb dating /
- petrogenesis /
- tectonic setting
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致谢: 中国地质调查局天津地质调查中心王惠初、辛后田、滕学建高级工程师等对本项目给予了大力支持；野外工作得到河北省区域地质调查院张计东、魏文通、胡醒民等高级工程师的指导；LA- ICP-MS锆石U-Pb同位素分析得到中国地质科学院大陆构造与动力学实验室吴才来研究员的帮助；评审专家对文章提出了诸多宝贵意见，在此一并表示衷心感谢。
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图 2 石板井地区英云闪长岩(a、c)、石英闪长岩(b、d)野外及薄片显微特征
Pl—斜长石；Q—石英；Hb—角闪石；Bt—黑云母
Figure 2. Field and microscopic photos of tonalite, quartz diorite in the Shibanjing area
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图 5 石板井地区英云闪长岩、石英闪长岩球粒陨石标准化稀土元素配分图(a)和原始地幔标准化微量元素蛛网图(b()标准化值据参考文献[20])
Figure 5. Chondrite-normalized REE patterns (a) and primitive-mantle normalized spider diagram (b) of tonalite, quartz diorite in Shibanjing area
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图 6 石板井地区石英闪长岩(PM01TW1)锆石阴极发光(CL)图像及206Pb/238U年龄值
Figure 6. Representative zircon CL images and 206Pb/238U ages of quartz diorite(PM01TW1)in Shibanjing area
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图 7 石板井地区石英闪长岩LA-ICP-MS锆石U-Pb谐和图
Figure 7. LA-ICP-MS U-Pb concordia diagram of zircon in the quartz diorite in the Shibanjing area
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图 8 石板井地区石英闪长岩、英云闪长岩K2O-Na2O图解
Figure 8. K2O-Na2O diagram of tonalite, quartz diorite in Shibanjing area
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图 9 石板井地区石英闪长岩、英云闪长岩(La/Yb)N-(Dy/Yb)N和(Dy/Yb)N-Nb/Ta图解(底图据参考文献[34])
Figure 9. (La/Yb)N-(Dy/Yb)N(a) and (Dy/Yb)N-Nb/Ta(b) diagram of tonalite, quartz diorite in Shibanjing area
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图 10 石板井地区石英闪长岩、英云闪长岩微量元素构造环境判别图(底图据参考文献[44])
Figure 10. Trace element discriminating diagram of tonalite, quartz diorite in Shibanjing area
表 1 石板井地区英云闪长岩、石英闪长岩主量、微量和稀土元素含量及标准矿物、锆石饱和温度计算结果
Table 1 Analytical results of major, trace elements and REE concentrations and normative mineral, zircon saturation temperatures of the tonalite, quartz diorite in Shibanjing area
样品编号 SBJ1 SBJ2 SBJ3 SBJ4 SBJ5 SBJ6 SBJ7 SBJ8 岩性 英云闪长岩 英云闪长岩 英云闪长岩 石英闪长岩 石英闪长岩 石英闪长岩 石英闪长岩 石英闪长岩 SiO2 64.87 67.38 64.24 59.76 62.05 57.90 61.82 58.54 TiO2 0.43 0.37 0.64 0.79 0.64 0.91 0.72 0.85 Al2O3 15.95 17.21 15.71 16.88 17.17 17.34 17.47 17.65 Fe2O3 1.65 0.74 2.77 3.06 2.20 2.67 2.04 2.36 FeO 2.01 1.46 2.66 3.34 2.69 4.27 3.01 4.11 MnO 0.087 0.038 0.056 0.14 0.069 0.11 0.080 0.10 MgO 1.92 1.04 1.87 2.90 1.83 3.43 2.06 2.89 CaO 5.04 3.52 4.91 6.52 4.84 7.29 5.54 6.50 Na2O 4.27 5.21 3.74 3.74 3.57 3.27 3.29 2.63 K2O 1.95 1.35 1.54 1.06 2.79 1.19 2.05 2.51 P2O5 0.12 0.171 0.234 0.18 0.28 0.22 0.308 0.23 烧失量 1.53 1.34 1.36 1.48 1.52 1.24 1.24 1.44 总量 99.83 99.83 99.73 99.85 99.65 99.85 99.63 99.81 A/CNK 0.87 1.05 0.94 0.88 0.97 0.87 0.99 0.94 ALK 6.22 6.56 5.27 4.80 6.36 4.46 5.34 5.15 K2O/Na2O 0.46 0.26 0.41 0.28 0.78 0.36 0.62 0.95 Or 11.71 8.09 9.24 6.40 16.81 7.11 12.29 15.10 Ab 36.80 44.73 32.16 32.17 30.77 28.08 28.33 22.64 An 18.91 16.59 21.95 26.61 22.61 29.56 25.90 29.40 C 0.00 1.21 0.00 0.00 0.16 0.00 0.51 0.00 Rb 40.4 124 61.1 29.9 84.5 15.3 77.4 87.0 Ba 492 1714 1205 336 1532 367 2190 783 Th 6.36 6.22 4.74 5.96 4.92 4.16 1.76 9.60 U 1.63 1.38 1.96 1.66 0.85 1.22 0.97 1.19 Ta 0.96 0.52 0.56 0.70 0.52 1.00 0.45 0.61 Nb 10.4 7.59 10.6 9.10 8.59 5.28 9.90 10.3 Sr 462 538 897 415 733 542 829 431 Zr 136 109 156 173 184 126 177 246 Hf 5.70 3.80 4.89 8.32 8.53 5.48 8.52 6.70 V 53.5 39.2 96.2 113 74.5 150 104 113 Ni 12.4 2.10 10.8 6.89 5.81 11.1 6.91 10. 9 Cr 29.2 6.89 15.6 13.4 13.0 20.1 20.0 28.5 Ga 15.7 15.7 20.6 16.5 18.6 19.2 20.9 22.5 Cs 1.96 3.75 2.95 1.62 3.60 1.44 3.97 4.13 Pb 7.08 18.9 11.1 7.30 8.74 10.5 12.3 5.33 Y 9.76 9.93 13.3 19.2 13.7 18.5 15.4 22.5 La 14.3 16.5 21.2 17.9 32.2 17.1 21.7 47.0 Ce 27.9 39.4 43.9 36.1 67.2 43.5 52.7 93.1 Pr 3.54 4.78 5.29 4.87 8.59 5.13 6.72 10.9 Nd 12. 5 17.4 21.2 19.2 31.0 20.6 28.2 39.6 Sm 2.22 2.91 4.02 3.75 4.91 4.15 4.86 6.80 Eu 0.69 0.81 1.33 1.18 1.32 1.25 1.60 1.58 Gd 1.97 2.34 3.03 3.25 4.33 3.46 3.67 6.42 Tb 0.32 0.38 0.53 0.56 0.61 0.62 0.61 0.92 Dy 1.80 1.89 2.66 3.53 2.87 3.45 2.84 4.55 Ho 0.36 0.34 0.46 0.72 0.50 0.67 0.51 0.82 Er 1.04 0.96 1.37 2.07 1.46 1.81 1.45 2.25 Tm 0.15 0.14 0.20 0.31 0.18 0.32 0.22 0.33 Yb 1.06 0.90 1.18 2.17 1.18 1.85 1.36 1.94 Lu 0.18 0.17 0.18 0.33 0.20 0.25 0.18 0.28 ∑REE 68.05 88.91 106.55 95.85 156.52 104.14 126.62 216.52 LREE/ HREE 8.91 11.51 10.09 6.41 12.82 7.38 10.68 11.37 δEu 0.99 0.92 1.12 1.01 0.85 0.98 1.11 0.72 (La/Yb)N 9.71 13.16 12.89 5.92 19.60 6.64 11.45 17.43 (La/Sm)N 4.17 3.66 3.40 3.08 4.23 2.66 2.88 4.46 (Gd/Yb)N 1.54 2.15 2.12 1.24 3.04 1.55 2.23 2.74 Zr/Nb 0.55 0.97 0.46 0.91 0.99 1.04 0.86 0.65 Nb/Ta 10.86 13.15 18.86 13.01 16.64 5.27 21.90 16.80 Zr/Hf 23.79 32.36 31.95 20.85 21.55 22.92 20.77 36.77 Rb/Sr 0.09 0.05 0.07 0.07 0.12 0.03 0.09 0.20 Rb/Ba 0.08 0.06 0.05 0.09 0.06 0.04 0.04 0.11 Sr/Y 47.32 51.11 67.41 21.58 53.41 29.29 53.73 19.16 TZr/℃ 739 792 760 751 773 719 772 786 注：A/CNK=Al2O3/(Na2O+CaO+K2O); δEu= EuN/((SmN+GdN)/2);TZr为据Watson等[16]方法计算的锆石饱和温度；主量元素含量和标准矿物单位为%，微量和稀土元素为10-6 
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表 2 石板井地区石英闪长岩(PM01TW1)LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 2 LA-ICP-MS zircon U-Th-Pb data for the quartz diorite(PM01TW1)in Shibanjing area
测点 元素含量/10-6 Th/U 同位素比值 同位素年龄/Ma Pb U Th 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 01 28 364 166 0.46 0.0751 0.0008 0.5851 0.0091 0.0565 0.0008 467.1 4.9 467.7 7.3 471.0 31 02 33 439 217 0.50 0.0741 0.0008 0.5843 0.0087 0.0572 0.0008 460.9 4.8 467.2 6.9 498.1 29 03 30 391 203 0.52 0.0741 0.0008 0.5855 0.0133 0.0573 0.0011 460.6 4.9 468.0 11 504.3 43 04 27 353 161 0.46 0.0751 0.0008 0.5837 0.0098 0.0563 0.0008 467.1 5.2 466.8 7.8 465.6 33 05 18 240 116 0.48 0.0745 0.0008 0.5802 0.0109 0.0565 0.0009 463.3 5.2 464.6 8.7 470.7 37 06 29 378 154 0.41 0.0752 0.0008 0.5811 0.0093 0.0560 0.0008 467.5 5.1 465.2 7.4 453.9 32 07 17 218 97 0.44 0.0744 0.0008 0.5834 0.0110 0.0568 0.0010 462.8 5.0 466.6 8.8 485.7 38 08 22 286 138 0.48 0.0747 0.0009 0.5778 0.0116 0.0561 0.0010 464.1 5.5 463.0 9.3 457.5 39 09 15 192 87 0.45 0.0743 0.0008 0.5848 0.0114 0.0571 0.0010 462.0 4.8 467.5 9.1 494.7 40 10 18 240 86 0.36 0.0753 0.0008 0.5807 0.0103 0.0559 0.0009 468.0 5.0 464.9 8.3 449.7 36 11 22 291 110 0.38 0.0750 0.0009 0.5821 0.0113 0.0563 0.0009 466.0 5.3 465.8 9.0 465.1 36 12 23 295 133 0.45 0.0749 0.0009 0.5809 0.0096 0.0562 0.0008 465.9 5.3 465.0 7.7 460.8 32 13 31 410 180 0.44 0.0742 0.0008 0.5845 0.0089 0.0572 0.0008 461.1 4.9 467.3 7.2 498.0 30 14 28 370 136 0.37 0.0742 0.0008 0.5787 0.0090 0.0565 0.0008 461.6 4.8 463.6 7.2 473.7 31 15 28 364 158 0.43 0.0750 0.0008 0.5818 0.0094 0.0562 0.0008 466.4 5.3 465.6 7.5 461.8 31 16 48 617 334 0.54 0.0743 0.0008 0.5865 0.0084 0.0572 0.0007 462.2 5.1 468.6 6.7 500.3 27 17 20 269 94 0.35 0.0744 0.0008 0.5837 0.0095 0.0569 0.0008 462.5 5.1 466.9 7.6 488.2 32 18 23 296 115 0.39 0.0752 0.0009 0.5786 0.0100 0.0558 0.0008 467.2 5.5 463.6 8.1 445.3 33 19 19 255 90 0.35 0.0746 0.0008 0.5892 0.0110 0.0573 0.0010 463.8 5.1 470.4 8.7 502.8 37 20 30 384 179 0.47 0.0749 0.0011 0.5835 0.0111 0.0565 0.0009 465.8 6.6 466.7 8.8 471.2 34 21 18 244 80 0.33 0.0754 0.0010 0.5849 0.0156 0.0563 0.0013 468.4 6.2 467.6 13 463.5 50 22 18 244 72 0.30 0.0750 0.0008 0.5840 0.0172 0.0564 0.0016 466.4 4.8 467.0 14 470.1 63 23 21 276 99 0.36 0.0741 0.0010 0.5816 0.0132 0.0569 0.0013 461.1 6.2 465.5 11 487.4 50 24 26 350 102 0.29 0.0751 0.0009 0.5881 0.0138 0.0568 0.0012 466.6 5.3 469.6 11 484.4 47
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