Genesis and tectonic setting of Cuiluan plutonic complex in the south section of the Xiaoxing'an Mountains: Evidences of geochemical and zircon Hf isotope
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摘要:
通过对黑龙江省小兴安岭南段中奥陶世翠峦杂岩体的年代学、岩石地球化学、锆石Hf同位素特征的研究，探讨岩体的形成时代、成因、物质来源和构造背景。采用LA−ICP-MS锆石U−Pb定年，获得花岗闪长岩和二长花岗岩样品的年龄分别为463±2 Ma和462±2 Ma，时代为中奥陶世。全岩地球化学研究表明，岩石均具有高Si、高K富碱，贫Ti、Mg、Fe、P等特征。大离子亲石元素K、Rb富集，高场强元素Ti、Nb、Ta、P和HREE亏损，具有显著的负Eu异常（δEu=0.38~0.64），以上都显示岩浆的壳源特征。花岗闪长岩锆石的εHf(t)=2.4~ 3.4，数值集中且均分布于球粒陨石线之上，暗示岩浆源区为新生陆壳物质的部分熔融；地壳模式年龄TDMc=1070～1128 Ma，证实该地区存在中元古代地壳增生事件。本次研究认为，翠峦杂岩体形成于洋陆板块俯冲的构造环境。
Abstract:This paper studies the chronology, rock geochemistry and zircon Hf isotopic characteristics of the Middle Ordovician Cuiluan plutonic complex in the south section of the Xiaoxing'an Mountains in Heilongjiang Province, focusing on the formation age, petrogenesis, magmatic material source and tectonic background of the rock mass. Using laser ablation plasma mass spectrometer (LA−ICP-MS) zircon U−Pb dating method, the ages of granodiorite and granite porphyry samples are dated to be 463±2 Ma and 462±2 Ma, i.e., Middle Ordovician. The study of rock geochemistry shows that both samples are characterized by high Si and K, rich alkali, and poor Ti, Mg, Fe, P, etc. It is enriched in LILE (e.g., Rb, K ), depleted in HFSE (e.g., Ti, Nb, Ta, P and HREE) with significant negative Eu anomalies（δ Eu= 0.38~0.64), which show the crust source characteristics of magma. Zircon εHf (t)=2.4~3.4, the values are concentrated and distributed above the chondrite line, indicating that the magma source area is the partial melting of the new continental crust material. TDMc = 1128~1070 Ma, confirming the existence of Mesoproterozoic crustal accretion events in this area. This study suggests that the Cuiluan complex was formed in the tectonic environment of subduction of oceanic and continental plates.
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Key words:
- plutonic complex /
- zircon U−Pb ages /
- zircon Hf isotope /
- petrogenesis /
- South of Xiaoxing'an Mountains
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图 3 锆石U−Pb谐和图（a, b）和年龄加权平均值分布图（c, d）（图a、b典型锆石图像中黑色圈为U−Pb同位素测试点，白色圈为Hf同位素测试点）
Figure 3.
图 4 SiO2−K2O 图解(a，底图据Peccerillo et al., 1976）和A/CNK−A/NK图解(b，底图据Rickwood, 1989）
Figure 4.
图 5 稀土元素球粒陨石标准化配分图(a，标准化值据Boynton, 1984）和微量元素原始地幔标准化蛛网图(b，标准化值据McDonough et al., 1992）
Figure 5.
图 6 SiO2-P2O5图解(a)和Rb-Th图解(b)（a,b底图据Chappell et al., 1999）
Figure 6.
表 1 杂岩体锆石U−Th−Pb分析结果
Table 1. The analytical results of zircon U−Th−Pb of plutonic complex
测点 含量/10−6 U/Th 同位素比值 年龄/Ma Pb Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ CL1-01 19.21 78.5 233 2.97 0.0545 0.0017 0.5656 0.0177 0.0748 0.0008 394.5 68.5125 455.2 11.4977 464.9 5.0470 CL1-02 34.7 240 392 1.63 0.0537 0.0016 0.5472 0.0156 0.0736 0.0006 366.7 66.66 443.2 10.2604 457.7 3.8125 CL1-03 12.40 66.7 147 2.20 0.0557 0.0021 0.5671 0.0214 0.0737 0.0008 442.6 85.175 456.1 13.8393 458.2 4.9447 CL1-04 23.41 99.1 280 2.83 0.0553 0.0016 0.5726 0.0160 0.0749 0.0007 433.4 60.18 459.7 10.3474 465.6 4.0008 CL1-05 10.57 54.8 124 2.26 0.0592 0.0024 0.6117 0.0251 0.0747 0.0010 576.0 87.0225 484.6 15.7941 464.1 5.8237 CL1-06 11.55 40.7 140 3.44 0.0562 0.0026 0.5774 0.0254 0.0745 0.0009 461.2 99.99 462.8 16.3439 463.0 5.5438 CL1-07 26.14 155 306 1.97 0.0517 0.0015 0.5319 0.0164 0.0740 0.0007 272.3 63.88 433.1 10.8476 460.3 4.4513 CL1-08 28.09 146 337 2.31 0.0561 0.0016 0.5719 0.0167 0.0734 0.0007 457.5 64.81 459.2 10.7864 456.8 4.0313 CL1-09 18.12 85.5 216 2.53 0.0589 0.0020 0.6064 0.0201 0.0744 0.0007 561.1 74.06 481.3 12.7286 462.5 4.4341 CL1-10 13.25 60.5 159 2.63 0.0549 0.0020 0.5713 0.0206 0.0752 0.0008 405.6 83.325 458.9 13.3121 467.4 5.0048 CL1-11 35.33 212 412 1.94 0.0561 0.0016 0.5778 0.0159 0.0742 0.0006 453.8 62.9575 463.0 10.2182 461.7 3.7063 CL1-12 18.24 103 214 2.08 0.0553 0.0020 0.5731 0.0206 0.0748 0.0008 433.4 79.62 460.0 13.2942 465.0 4.8813 CL1-13 16.83 101 197 1.95 0.0565 0.0019 0.5898 0.0199 0.0753 0.0008 472.3 75.9175 470.7 12.7399 468.2 4.5770 CL1-14 16.47 72.7 197 2.71 0.0527 0.0020 0.5473 0.0199 0.0752 0.0007 322.3 82.4 443.3 13.0300 467.3 4.0956 CL1-15 18.80 80.0 228 2.85 0.0537 0.0018 0.5614 0.0196 0.0755 0.0008 366.7 77.77 452.4 12.7281 469.3 4.9822 CL1-16 16.99 96.0 201 2.09 0.0546 0.0021 0.5598 0.0220 0.0741 0.0009 398.2 87.0275 451.4 14.3187 460.6 5.3230 CL1-17 12.66 75.3 148 1.97 0.0535 0.0023 0.5561 0.0239 0.0752 0.0009 350.1 102.7675 449.0 15.5963 467.4 5.3792 CL1-18 16.88 90.2 201 2.23 0.0586 0.0021 0.5994 0.0211 0.0740 0.0008 550.0 77.765 476.8 13.3955 460.0 4.6355 CL1-19 18.98 110 223 2.03 0.0542 0.0018 0.5557 0.0189 0.0745 0.0008 388.9 75.92 448.7 12.3357 463.0 4.7197 CL1-20 20.85 114 246 2.16 0.0524 0.0019 0.5389 0.0188 0.0744 0.0007 305.6 83.325 437.7 12.3794 462.6 4.2110 CL2-01 10.25 40.8 126 3.09 0.0563 0.0025 0.5672 0.0249 0.0736 0.0009 464.9 98.1375 456.2 16.1197 457.8 5.3235 CL2-02 13.07 65.9 157 2.38 0.0590 0.0027 0.6033 0.0232 0.0739 0.0010 564.9 101.8375 479.3 14.7065 459.5 5.7479 CL2-03 18.23 112 215 1.92 0.0571 0.0019 0.5832 0.0199 0.0740 0.0008 494.5 72.215 466.5 12.7604 460.3 4.9522 CL2-04 29.79 163 357 2.19 0.0576 0.0015 0.5919 0.0160 0.0742 0.0007 516.7 57.4025 472.0 10.2177 461.4 4.3967 CL2-05 12.57 65.2 151 2.32 0.0532 0.0020 0.5425 0.0198 0.0740 0.0009 344.5 83.325 440.1 13.0404 460.4 5.3452 CL2-06 20.02 87.3 244 2.79 0.0574 0.0019 0.5895 0.0191 0.0744 0.0008 509.3 76.8425 470.5 12.2101 462.6 4.9141 CL2-07 16.72 70.1 206 2.94 0.0558 0.0018 0.5734 0.0187 0.0743 0.0009 442.6 74.0675 460.2 12.0887 462.3 5.1241 CL2-08 31.04 165 374 2.27 0.0556 0.0015 0.5669 0.0150 0.0737 0.0007 435.2 62.03 456.0 9.7473 458.3 4.2007 CL2-09 11.38 54.1 138 2.55 0.0564 0.0023 0.5815 0.0238 0.0745 0.0010 477.8 97.2125 465.4 15.2988 463.5 5.8663 CL2-10 28.22 104 349 3.36 0.0572 0.0017 0.5885 0.0166 0.0745 0.0008 498.2 64.8075 469.9 10.6400 462.9 4.9271 CL2-11 19.03 93.3 226 2.42 0.0548 0.0020 0.5642 0.0190 0.0747 0.0009 405.6 81.4725 454.2 12.3174 464.2 5.1986 CL2-12 14.76 86.8 170 1.96 0.0590 0.0021 0.6071 0.0204 0.0745 0.0008 568.6 84.245 481.7 12.8993 463.3 4.7370 CL2-13 14.31 62.8 173 2.75 0.0587 0.0022 0.6020 0.0215 0.0745 0.0008 553.7 81.4675 478.5 13.6302 463.5 4.6505 CL2-14 17.89 63.5 221 3.48 0.0545 0.0018 0.5581 0.0184 0.0742 0.0007 390.8 71.29 450.3 11.9930 461.2 3.9768 CL2-15 32.91 135 403 2.99 0.0543 0.0015 0.5567 0.0156 0.0741 0.0007 383.4 67.585 449.4 10.1893 460.7 4.0958 CL2-16 19.03 82.6 233 2.82 0.0541 0.0018 0.5595 0.0188 0.0750 0.0009 376.0 75.9175 451.2 12.2655 466.0 5.2893 CL2-17 18.92 115 222 1.93 0.0550 0.0019 0.5588 0.0186 0.0738 0.0007 413.0 77.77 450.8 12.0937 458.9 4.1504 CL2-18 14.47 63.8 174 2.73 0.0541 0.0021 0.5560 0.0207 0.0745 0.0008 376.0 85.175 448.9 13.5335 463.0 4.7550 CL2-19 15.76 105 179 1.70 0.0556 0.0020 0.5705 0.0207 0.0741 0.0009 435.2 77.77 458.3 13.3956 461.0 5.2748 CL2-20 27.55 103 337 3.27 0.0550 0.0015 0.5661 0.0159 0.0744 0.0007 413.0 62.9575 455.5 10.3178 462.7 4.2279 CL2-21 24.90 122 296 2.43 0.0554 0.0016 0.5668 0.0166 0.0740 0.0006 427.8 69.4375 455.9 10.7389 460.1 3.8453 CL2-22 10.82 60.7 125 2.06 0.0539 0.0021 0.5522 0.0207 0.0746 0.0009 364.9 87.0275 446.4 13.5304 464.0 5.1212 CL2-23 25.66 149 302 2.03 0.0533 0.0017 0.5480 0.0173 0.0745 0.0007 338.9 37.96 443.7 11.3307 462.9 4.4696 CL2-24 22.33 137 256 1.87 0.0542 0.0017 0.5547 0.0176 0.0739 0.0007 388.9 73.14 448.0 11.5039 459.4 4.4011 CL2-25 11.49 65.2 135 2.07 0.0548 0.0021 0.5610 0.0211 0.0743 0.0009 405.6 85.1775 452.1 13.7599 461.8 5.4721 
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表 2 杂岩体主量、微量和稀土元素分析结果及特征参数
Table 2. Major, trace and rare earth element compositions and key parameters of plutonic complex
元素 花岗闪长岩 二长花岗岩 CL1-25 CL1-31 CL1-32 CL1-33 CL1-34 CL1-35 CL2-26 CL2-27 CL2-28 CL2-29 CL2-30 SiO2 67.14 70.66 71.88 66.79 70.62 68.16 70.63 72.97 70.19 71.97 67.12 TiO2 0.37 0.33 0.35 0.38 0.31 0.41 0.35 0.30 0.37 0.35 0.37 Al2O3 16.85 14.53 14.02 13.92 14.47 14.95 13.99 14.07 14.10 13.99 16.81 Fe2O3 3.72 2.73 2.52 4.05 2.53 3.37 2.55 1.91 3.35 2.44 3.72 MnO 0.14 0.05 0.06 0.05 0.05 0.07 0.04 0.04 0.06 0.05 0.14 MgO 0.75 0.69 0.76 0.75 0.52 0.73 0.61 0.46 0.92 0.59 0.77 CaO 3.11 1.64 1.33 1.27 1.89 2.46 1.96 0.86 2.42 1.67 3.12 Na2O 1.42 3.04 2.92 3.47 3.41 3.18 2.81 2.72 2.47 2.80 1.45 K2O 5.16 5.61 5.22 4.97 5.49 5.43 5.51 5.79 5.31 5.59 5.19 P2O5 0.08 0.08 0.09 0.09 0.08 0.10 0.07 0.05 0.08 0.07 0.08 烧失量 1.00 0.66 1.11 3.19 0.77 0.67 0.74 1.09 1.11 0.90 0.95 FeO 3.35 2.46 2.27 3.76 2.28 3.03 2.29 1.72 3.01 2.20 3.35 Mg＃ 16.65 19.98 22.93 15.38 17.04 17.72 19.10 19.11 21.44 19.37 16.92 Na2O+K2O 6.58 8.65 8.14 8.44 8.89 8.61 8.32 8.51 7.78 8.39 6.64 AKI 0.47 0.76 0.75 0.80 0.80 0.74 0.76 0.76 0.70 0.76 0.48 Be 3.05 3.31 3.25 3.33 3.11 3.86 2.74 2.14 2.56 3.00 4.86 Sc 4.42 3.89 3.83 4.06 3.49 5.93 4.76 3.28 4.43 4.75 6.28 V 19.54 17.69 20.16 20.19 16.28 23.89 22.29 14.65 25.23 20.16 13.46 Cr 4.75 2.43 6.21 2.96 2.70 4.21 6.00 2.57 7.01 4.94 1.64 Co 3.18 3.02 3.54 8.12 2.93 4.36 3.69 1.98 3.87 3.15 3.25 Ni 1.74 1.65 2.86 1.80 1.38 1.90 2.21 1.82 2.74 1.89 1.43 Ga 17.25 17.52 16.92 17.32 17.51 19.45 17.90 16.16 17.95 17.03 20.96 Rb 285.77 240.80 238.58 233.44 207.26 226.27 255.72 306.49 271.04 286.85 256.85 Sr 190.91 246.70 195.60 131.20 293.40 362.45 244.11 155.77 244.90 193.47 207.81 Y 37.31 28.33 27.63 30.63 23.19 34.47 34.12 33.71 30.90 37.51 40.49 Zr 256.68 260.48 256.30 286.19 220.27 285.96 275.02 252.92 260.26 248.28 402.82 Nb 12.65 11.61 12.57 13.59 10.34 13.93 12.68 12.67 11.99 12.85 17.61 Sn 4.77 3.94 3.64 7.82 2.79 4.21 4.16 4.01 4.40 4.88 3.18 Cs 7.44 7.86 7.49 3.57 4.36 6.66 7.70 9.26 9.60 7.32 21.42 Ba 585.36 631.88 703.97 586.99 586.69 832.00 629.51 564.99 666.58 593.30 670.11 La 58.60 54.32 49.21 59.22 49.42 57.70 55.06 57.28 58.87 59.89 65.79 Ce 116.39 104.62 94.48 112.94 92.96 113.05 109.77 114.39 115.05 118.61 129.41 Pr 12.51 11.15 9.90 11.71 9.76 12.24 11.88 12.19 12.04 12.74 13.87 Nd 43.58 38.08 33.73 40.20 33.01 42.71 41.14 42.28 42.48 44.89 49.71 Sm 8.20 6.37 5.67 6.70 5.59 7.91 7.19 7.33 7.02 8.29 8.80 Eu 0.96 0.96 1.01 1.07 1.04 1.26 0.94 0.88 1.04 0.97 1.24 Gd 7.11 4.83 4.71 5.27 4.04 6.18 6.19 5.87 5.84 6.81 7.45 Tb 1.09 0.77 0.74 0.79 0.64 0.96 1.00 0.93 0.87 1.11 1.13 Dy 6.67 4.69 4.56 5.05 3.84 5.87 5.99 5.70 5.29 6.84 7.10 Ho 1.27 0.92 0.89 0.98 0.73 1.12 1.09 1.09 1.02 1.26 1.36 Er 3.83 2.67 2.53 2.96 2.18 3.26 3.24 3.22 2.89 3.58 3.91 Tm 0.55 0.43 0.42 0.47 0.32 0.50 0.48 0.51 0.43 0.53 0.63 Yb 3.39 2.72 2.58 3.01 2.35 3.23 3.12 3.30 2.80 3.30 4.02 Lu 0.52 0.43 0.40 0.47 0.33 0.51 0.48 0.50 0.43 0.49 0.61 Hf 7.67 7.13 6.96 7.77 5.82 7.56 7.84 7.50 7.22 7.22 10.35 Ta 1.31 1.16 1.16 1.04 0.93 1.10 1.15 1.24 1.03 1.28 1.45 Tl 2.25 1.60 2.18 2.23 1.40 1.67 1.76 2.58 2.09 2.49 1.89 Pb 23.22 27.80 21.49 20.63 38.26 37.54 26.23 20.73 22.37 22.73 16.77 Th 39.02 24.00 32.57 33.01 28.70 29.77 35.99 40.74 31.66 37.90 30.44 U 15.18 9.29 10.45 13.56 9.27 9.71 12.61 14.42 11.24 13.22 15.49 A/NK 2.13 1.31 1.34 1.26 1.25 1.35 1.32 1.31 1.44 1.31 2.10 A/CNK 1.24 1.03 1.09 1.04 0.97 0.96 0.99 1.14 0.99 1.02 1.23 ∑REE 264.29 233.29 210.81 250.87 206.22 256.40 247.82 255.13 256.03 269.68 294.65 ∑LREE 239.86 215.83 193.98 231.87 191.79 234.77 226.23 234.01 236.46 245.76 268.44 ∑HREE 24.43 17.46 16.83 19.00 14.43 21.63 21.59 21.12 19.57 23.92 26.21 LREE/HREE 9.82 12.36 11.53 12.20 13.29 10.85 10.48 11.08 12.08 10.27 10.24 δEu 0.38 0.51 0.58 0.53 0.64 0.53 0.42 0.40 0.48 0.38 0.46 Eu* 34.75 25.66 23.63 27.35 22.13 32.21 30.39 30.13 29.27 34.40 36.95 (La/Sm)N 4.50 5.36 5.46 5.56 5.56 4.59 4.82 4.92 5.28 4.55 4.70 (La/Yb)N 11.65 13.46 12.86 13.26 14.17 12.04 11.91 11.71 14.18 12.24 11.04 (Sm/Nd)N 0.58 0.51 0.52 0.51 0.52 0.57 0.54 0.53 0.51 0.57 0.54 (Gd/Yb)N 1.69 1.43 1.47 1.41 1.39 1.54 1.60 1.44 1.68 1.67 1.50 注：主量元素含量单位为%，微量和稀土元素含量单位为10−6
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表 3 花岗闪长岩锆石Hf同位素分析结果
Table 3. Zircon Hf isotope analysis table of the granodiorite
点号 年龄/Ma 176Yb/177Hf 1σ 176Lu/177Hf 1σ 176Hf/177Hf 1σ εHf(0) εHf(t) 1σ TDM1/Ma TDMc/Ma fLu/Hf CL1-01 458 0.028200 0.000009 0.000772 0.000016 0.282590 0.000512 −6.43 3.4 18.13 932 1070 −0.976739 CL1-02 460 0.028547 0.000009 0.000776 0.000022 0.282580 0.000796 −6.79 3.1 28.20 946 1088 −0.976613 CL1-03 460 0.034437 0.000009 0.000917 0.000019 0.282583 0.000798 −6.69 3.2 28.24 946 1085 −0.972376 CL1-04 461 0.036062 0.000008 0.000957 0.000012 0.282564 0.000602 −7.36 2.5 21.32 973 1120 −0.971162 CL1-05 460 0.024758 0.000008 0.000657 0.000013 0.282566 0.000670 −7.30 2.6 23.70 964 1112 −0.980219 CL1-06 463 0.015717 0.000008 0.000436 0.000002 0.282577 0.000184 −6.89 3.2 6.50 942 1088 −0.986864 CL1-07 462 0.044822 0.000008 0.001247 0.000046 0.282567 0.001554 −7.24 2.6 55.03 976 1118 −0.962447 CL1-08 458 0.033730 0.000008 0.000913 0.000021 0.282563 0.000945 −7.38 2.4 33.46 973 1121 −0.972496 CL1-09 463 0.027405 0.000009 0.000745 0.000011 0.282557 0.000462 −7.61 2.4 16.35 978 1128 −0.977573 CL1-10 463 0.027997 0.000009 0.000778 0.000003 0.282563 0.000200 −7.40 2.6 7.08 971 1119 −0.976552
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