The syenogranite in the middle section of Yilehuli Mountain, Daxinganling Mountains: LA-ICP-MS zircon U-Pb age and geochemical characteristics
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摘要:
对伊勒呼里山中段正长花岗岩开展岩相学、地球化学、LA-ICP-MS锆石U-Pb定年研究, 结果表明其具有高硅、富碱、贫镁钙, 低FeOT/MgO比值特征, 属准铝质-弱过铝质、高钾钙碱性系列. 轻稀土富集, 重稀土亏损, 铕负异常; 富集大离子亲石元素Rb、Th、K, 亏损高场强元素Nb、Ta、Ti、P和大离子亲石元素Ba、Sr、La, 为典型的低Ba-Sr、高分异I型花岗岩, 是地壳物质部分熔融产物. LA-ICP-MS锆石U-Pb定年加权平均年龄为143.90±1.20 Ma, 属早白垩世早期. 结合区域研究资料, 岩体是在蒙古-鄂霍次克洋构造域造山后伸展环境下, 地壳发生拆沉作用, 导致岩石圈减薄, 基性岩浆上涌接触地壳, 使地壳物质发生部分熔融作用的产物.
Abstract:The paper comprehensively studies the petrography, geochemistry, and LA-ICP-MS zircon U-Pb dating of the syenogranite in the middle section of Yilehuli Mountain. The results show that the syenogranite is characterized by high Si and rich alkali contents, poor Mg and Ca contents, and low FeOT/MgO ratio, belonging to quasialuminous-weakly peraluminous and high-K calc-alkaline series. The rock, with enriched LREEs, depleted HREEs and negative Eu anomaly, as well as enriched LILEs (Rb, Th, and K) and depleted HFSEs (Nb, Ta, Ti, and P) and LILEs (Ba, Sr, and La), is identified as a typical low Ba-Sr, highly fractionated I-type granite, formed by partial melting of crustal materials. The LA-ICP-MS zircon U-Pb dating yields a weighted mean age of 143.90 ± 1.20 Ma, indicating the early stage of Early Cretaceous. Combined with regional geological data, the pluton is the product of partial melting of crustal materials under the post-orogenic extensional setting within the Mongolia-Okhotsk Ocean tectonic domain, where the crustal delamination led to lithospheric thinning and upwelling of basic magma to contact with the crust.
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Key words:
- syenogranite /
- zircon U-Pb age /
- Early Cretaceous /
- Mongolia-Okhotsk Ocean /
- Yilehuli Mountain /
- Daxinganling Mountains
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表 1 正长花岗岩LA-ICP-MS锆石U-Pb定年结果(D3673)
Table 1. The LA-ICP-MS zircon U-Pb dating results of syenogranite sample D3673
编号 同位素比值 年龄/Ma 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 1 0.0222 0.0002 0.1548 0.0015 0.0505 0.0005 142 1 146 1 217 22 2 0.0225 0.0002 0.158 0.0013 0.0509 0.0004 143 2 149 1 238 18 3 0.0218 0.0002 0.1543 0.0058 0.0513 0.0019 139 1 146 6 253 84 4 0.0227 0.0003 0.1635 0.0019 0.0522 0.0006 145 2 154 2 292 26 5 0.0219 0.0002 0.1465 0.006 0.0486 0.0019 139 1 139 6 127 94 6 0.0224 0.0004 0.1553 0.0108 0.0502 0.0033 143 3 147 10 206 154 7 0.022 0.0002 0.169 0.0045 0.0557 0.0014 140 1 159 4 440 54 8 0.0224 0.0002 0.1524 0.0013 0.0493 0.0004 143 2 144 1 160 19 9 0.0222 0.0003 0.164 0.008 0.0535 0.0025 142 2 154 8 349 107 10 0.0229 0.0002 0.1591 0.0013 0.0504 0.0004 146 1 150 1 215 17 11 0.0221 0.0004 0.1745 0.0064 0.0573 0.0017 141 3 163 6 505 65 12 0.0227 0.0002 0.1612 0.0013 0.0515 0.0005 145 1 152 1 265 21 13 0.0223 0.0002 0.1599 0.0019 0.052 0.0004 142 2 151 2 286 19 14 0.0232 0.0002 0.166 0.0029 0.052 0.0009 148 1 156 3 283 40 15 0.0232 0.0002 0.1706 0.0016 0.0534 0.0004 148 1 160 1 345 18 16 0.0227 0.0005 0.1743 0.0178 0.0557 0.0054 145 3 163 17 442 214 17 0.0234 0.0002 0.1602 0.0016 0.0498 0.0005 149 1 151 2 184 23 18 0.0226 0.0002 0.1606 0.002 0.0516 0.0006 144 1 151 2 268 25 19 0.0231 0.0003 0.1669 0.0092 0.0523 0.0028 148 2 157 9 299 121 20 0.0227 0.0004 0.1754 0.0035 0.0562 0.001 144 2 164 3 459 39 21 0.0233 0.0004 0.1786 0.0102 0.0556 0.003 149 2 167 10 435 122 22 0.0225 0.0003 0.1656 0.0023 0.0534 0.0007 143 2 156 2 347 28 23 0.0232 0.0003 0.1724 0.0022 0.054 0.0006 148 2 161 2 371 24 24 0.0225 0.0002 0.1622 0.0039 0.0522 0.0012 144 2 153 4 293 54 25 0.0224 0.0002 0.1609 0.0015 0.052 0.0004 143 1 151 1 285 19 测试单位：中国地质调查局天津地质调查中心测试中心. 
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表 2 正长花岗岩样品主量元素分析结果
Table 2. Contents of major elements in syenogranite samples
样品编号 D3673 P20TC168 P20TC176 P20TC41 SiO2 75.66 75.88 75.8 75.2 TiO2 0.14 0.18 0.18 0.25 Al2O3 11.55 12.04 12.02 12 Fe2O3 1.57 1.38 1 1.11 FeO 1.46 1.1 1.29 1.7 MnO 0.03 0.03 0.01 0.02 MgO 0.37 0.31 0.24 0.43 CaO 0.59 0.44 0.38 0.57 Na2O 3.98 4.21 4.24 3.32 K2O 4.22 4.34 4.26 4.63 P2O5 0.07 0.11 0.11 0.1 LOI 0.02 0.14 0.08 0.26 Total 99.66 100.16 99.61 99.59 K2O/Na2O 1.06 1.03 1 1.39 FeOT/MgO 7.76 7.55 9.12 6.28 A/CNK 0.95 1.04 0.97 0.98 A/NK 1.04 1.03 1.04 1.14 σ 2.06 2.22 2.2 1.96 AR 5.16 5.35 5.36 4.44 DI 93.2 94.47 94.87 91.75 TZr /℃ 740 780 770 757 含量单位：%.
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表 3 正长花岗岩稀土元素分析结果
Table 3. Contents of REEs in syenogranite samples
样品编号 D3673 P20TC168 P20TC176 P20TC41 La 27.4 9.33 6.96 23.2 Ce 47.2 43 28.8 45.4 Pr 4.34 1.68 1.66 3.43 Nd 10.5 4.48 4.25 8.88 Sm 1.45 0.81 0.8 1.23 Eu 0.2 0.14 0.12 0.55 Gd 1.61 1.19 0.88 1.5 Tb 0.17 0.21 0.16 0.17 Dy 0.88 1.47 1.17 0.86 Ho 0.18 0.32 0.27 0.18 Er 0.68 1.1 0.98 0.67 Tm 0.14 0.19 0.18 0.12 Yb 0.96 1.25 1.2 0.93 Lu 0.2 0.23 0.22 0.19 Y 5.29 9.84 7.94 5.91 ∑REE 101.2 75.24 55.59 93.22 LR/HR 18.9 9.97 8.42 17.9 δEu 0.4 0.43 0.43 1.24 (La/Yb)N 19.26 5.03 3.91 16.82 含量单位：10-6.
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表 4 正长花岗岩微量元素分析结果
Table 4. Contents of trace elements in syenogranite samples
样品编号 D3673 P20TC168 P20TC176 P20TC41 Rb 263 130 123 113 Ba 133 27.7 44.1 340 Th 17.5 11.9 12.3 13.2 K 1.75 1.8 1.77 1.92 Nb 22.9 15 12 8.15 Ta 1.81 1.08 0.99 0.91 V 4 7.78 6.12 12.3 Cr 5.44 4.23 4.61 6.83 Sr 59.1 13.1 10.7 137 Sc 2.9 1.57 2.52 2.18 P 0.02 0.02 0.02 0.02 Ta 1.81 1.08 0.99 0.91 Zr 98.6 156 137 109 Hf 4.68 5.24 4.15 4.25 Ti 0.06 0.08 0.07 0.1 Co 6.21 10.5 15.7 11 Ni 4.08 4.41 4.75 4.54 Li 26 4.7 2.47 4.95 含量单位：10-6.
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