Age and geochemistry of strongly peraluminous granite in Airgin Sum area, Inner Mongolia, and its geological significance
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摘要:
内蒙古艾勒格庙二长花岗岩岩体分布在锡林浩特-艾勒格庙前寒武纪微陆块的西部, 利用LA-MC-ICP-MS锆石UPb法测得其形成年龄为418.5± 1.1Ma, 侵入时代为晚志留世末期。岩石地球化学特征显示高硅(SiO2 74.22%~75.51%), 富钾(K2O 5.41%~5.78%), 铝饱和指数A/CNK在1.17~1.21之间, 属于高钾钙碱性强过铝质花岗岩类。微量元素特征为富集Rb、Th、U、Pb、K和重稀土元素(Yb 3.74× 10-6~9.65× 10-6), 强烈亏损Nb、Ta、P、Ti等元素。该岩体形成于后碰撞构造环境, 是地壳增厚后折返减压部分熔融的产物。它的存在揭示, 艾勒格庙苏左旗北部造山带在晚志留世之前已经发生弧陆碰撞, 之后的顶志留世-中泥盆世为后碰撞-后造山的伸展背景。
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关键词:
- 强过铝质二长花岗岩 /
- LA-MC-ICP-MS锆石U-Pb年代学 /
- 地球化学 /
- 后碰撞 /
- 艾勒格庙
Abstract:Airgin Sum monzogranite plution is located in western Xilin Gol-Airgin Sum Precambrian block, Inner Mongolia. Its age of 418.5± 1.1Ma obtained by LA-MC-ICP-MS U-Pb zircon dating means that Airgin Sum plution was formed at the end of Late Silurian. Its petrology and geochemistry show that Airgin Sum monzogranite is characterized by high silicon (SiO2 74.22%~75.51%) and rich potassium (K2O 5.41%~5.78%)in association with A/CNK ratios ranging from 1.17 to 1.21, suggesting high-K and calc-al-kaline strongly peraluminous granite. The monzogranite is strongly enriched in Rb, Th, U, Pb, K and heavy rare earth elements (Yb 3.74× 10-6~9.65× 10-6) and is also characterized by depletion of Nb, Ta, Ti and P. It is suggested that the strongly peraluminous mon-zogranite was formed in the post-collisional setting and resulted from partial melting of crustal material after exhumation of overthickened crust. It is thus concluded that the northern orogen in Airgin Sum-Sonidzuoqi had collided between arc and block before Late Silurian, followed by an post-collision and post-orogenic extension setting during Upper Silurian-Middle Devonian.
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致谢: 感谢天津地质矿产研究所实验室耿建珍、郭虎高级工程师在样品测试及阴极发光拍摄过程中给予的帮助。
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图 1 艾勒格庙大地构造位置（A）[3]及区域地质简图（B）
Figure 1. Tectonic locations (A) and geological sketch map of Airgin Sum area (B)
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图 2 艾勒格庙强过铝质二长花岗岩野外（A）和镜下（B）特征
Gt—石榴子石；Mc—微斜长石；Q—石英；Bi—黑云母；Ms—白云母；Pl—斜长石
Figure 2. Petrological features of strongly peraluminous monzogranite of Airgin Sum
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图 3 强过铝质二长花岗岩代表性锆石CL图像及测点位置
Figure 3. CL images and dating spots of representative zircons of strongly peraluminous monzogranite
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图 4 强过铝质二长花岗岩锆石U-Pb谐和图
Figure 4. U-Pb concordia diagram of the zircon from strongly peraluminous monzogranite
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图 5 强过铝质二长花岗岩SiO2-K2O图解[18]
Figure 5. Diagram of K2O versus SiO2 of strongly peraluminous monzogranite
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图 7 强过铝质二长花岗岩稀土元素配分及微量元素蛛网图（球粒陨石及原始地幔数据据参考文献[20]）
Figure 7. Chondrite-normalized REE patterns and spidergram of strongly peraluminous monzogranite from Airgin Sum in Inner Mongolia
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图 8 强过铝质二长花岗岩Rb/Sr-Rb/Ba图解[21]
Figure 8. Diagram of Rb/Sr-Rb/Ba of strongly peraluminous monzogranite
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图 9 强过铝质二长花岗岩SiO2-（TFeO+MgO+TiO2）图解[21]
Figure 9. Diagram of SiO2 versus(TFeO+MgO+TiO2)of strongly peraluminous monzogranite
表 1 艾力格庙强过铝质二长花岗岩LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 1 LA-ICP-MS U-Th-Pb isotope analytical results of zircon from strongly peraluminous monzogranite in Airgin Sum
测点号 Pb/10-6 U/10-6 Th/U 同位素比值 表面年龄/Ma 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 08MD95 1 60 106 0.1109 0.0547 0.0004 0.506 0.004 0.0672 0.0004 400 15 416 3 419 2 2 105 132 0.0787 0.0550 0.0003 0.506 0.003 0.0668 0.0004 411 13 416 3 417 2 3 83 124 0.0933 0.0551 0.0003 0.509 0.003 0.0671 0.0004 415 13 418 3 418 3 4 70 219 0.2015 0.0555 0.0003 0.514 0.004 0.0671 0.0004 433 14 421 3 419 3 5 71 211 0.1923 0.0553 0.0003 0.512 0.003 0.0672 0.0004 424 14 420 3 419 3 6 81 219 0.1737 0.0553 0.0004 0.512 0.004 0.0671 0.0004 426 14 420 3 419 3 7 59 257 0.2894 0.0551 0.0004 0.510 0.004 0.0671 0.0004 415 15 418 3 419 3 8 64 185 0.1938 0.0551 0.0011 0.509 0.011 0.0670 0.0004 416 43 418 9 418 3 9 22 239 0.8227 0.0553 0.0009 0.512 0.009 0.0671 0.0004 423 37 420 7 419 3 10 47 228 0.3245 0.0552 0.0005 0.512 0.004 0.0672 0.0004 421 18 420 4 419 3 11 62 165 0.1721 0.0552 0.0003 0.511 0.004 0.0671 0.0004 420 14 419 3 419 2 12 86 150 0.1104 0.0552 0.0003 0.509 0.003 0.0669 0.0004 419 13 418 3 417 2 13 91 433 0.3169 0.0552 0.0003 0.511 0.004 0.0671 0.0004 420 14 419 3 419 2 14 21 100 0.3141 0.0551 0.0008 0.511 0.008 0.0672 0.0004 418 34 419 7 419 3 15 49 113 0.1468 0.0552 0.0004 0.512 0.004 0.0673 0.0004 421 17 420 4 420 3 16 36 37 0.0628 0.0553 0.0011 0.509 0.011 0.0668 0.0005 425 43 418 9 417 3 17 60 126 0.1333 0.0553 0.0004 0.510 0.004 0.0668 0.0004 426 15 418 3 417 2 18 49 106 0.1390 0.0552 0.0006 0.511 0.005 0.0672 0.0004 419 22 419 4 419 3 19 95 118 0.0778 0.0553 0.0003 0.511 0.003 0.0671 0.0004 424 13 419 3 419 3 20 86 103 0.0748 0.0552 0.0003 0.510 0.003 0.0669 0.0004 422 13 418 3 418 2 21 64 162 0.1653 0.0549 0.0004 0.509 0.004 0.0672 0.0004 408 15 418 3 419 3 
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表 2 内蒙古艾勒格庙强过铝质二长花岗岩主量、微量和稀土元素含量
Table 2 Values of major, trace and rare earth elements of strongly peraluminous monzogranite from Airgin Sum in Inner Mongolia
样号 08MD95 08MD96 08MD97 08MD97-1 SiO2 74.22 75.51 74.85 74.86 TiO2 0.04 0.04 0.05 0.04 Al2O3 14.55 14.00 14.16 14.34 Fe2O3 0.33 0.19 0.08 0.26 FeO 0.19 0.21 0.66 0.20 MnO 0.03 0.06 0.08 0.06 MgO 0.10 0.06 0.11 0.07 CaO 1.08 1.19 1.34 1.13 Na2O 2.49 2.20 2.31 2.25 k2o 5.78 5.45 5.41 5.65 P2O5 0.02 0.02 0.03 0.02 LOI 0.73 0.51 0.30 0.62 总量 99.57 99.42 99.37 99.50 K2O/Na2O 2.34 2.47 2.34 2.51 A/NK 1.40 1.47 1.47 1.46 A/CNK 1.18 1.20 1.17 1.21 CaO/Na2O 0.43 0.54 0.58 0.50 Al2O3/TiO2 328.39 397.56 309.93 360.62 Au 0.23 0.22 2.44 0.23 Ag 36.75 9.32 21.33 23.03 Cu 1.92 2.43 4.52 2.17 Zn 29.25 24.21 37.46 26.73 Be 0.86 1.23 1.09 1.15 Sc 2.29 2.54 2.41 2.32 V 5.97 5.94 8.20 5.95 Cr 2.57 1.80 10.85 2.19 Co 0.47 0.39 1.31 0.43 Ni 0.68 0.50 3.23 0.59 Ga 13.19 14.70 14.04 13.95 Sr 72.38 102.69 115.38 88.54 Zr 46.82 68.34 56.99 57.58 Cd 0.03 0.04 0.03 0.03 Cs 2.37 3.32 2.32 2.74 Hf 2.03 2.90 2.52 2.56 Ta 0.08 0.20 0.06 0.14 Pb 41.02 47.42 42.51 43.22 U 0.98 1.93 1.24 1.46 Rb 184.87 196.88 179.60 190.87 Ba 138.03 282.17 286.15 210.10 Th 13.27 15.73 18.86 14.50 Nb 1.33 1.61 1.54 1.47 Rb/Sr 2.55 1.92 1.56 2.16 Rb/Ba 1.34 0.70 0.63 0.91 La 4.73 3.17 5.08 3.95 Ce 7.46 6.72 7.88 7.09 Pr 0.98 0.80 1.12 0.85 Nd 3.80 3.04 4.30 3.52 Sm 1.15 1.10 1.28 1.13 Eu 0.36 0.46 0.59 0.45 Gd 2.06 2.79 2.52 2.43 Tb 0.51 0.83 0.66 0.67 Dy 4.48 8.30 5.97 6.29 Ho 1.10 2.28 1.58 1.69 Er 3.48 8.22 5.13 5.85 Tm 0.55 1.37 0.80 0.96 Yb 3.74 9.65 5.49 6.69 Lu 0.57 1.56 0.84 1.06 Y 33.96 74.79 48.23 54.37
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