Zircon U-Pb ages and geochemical characteristics of the quartz monzonite diorite rocks from Hanmiao area in the southern segment of the Da Hinggan Mountains
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摘要:
为确定罕庙地区石英二长闪长岩的形成时代、成因及地质意义，对罕庙地区石英二长闪长岩体进行了岩相学、LAMC-ICP-MS锆石U-Pb年龄及地球化学研究。结果表明，石英二长闪长岩中的锆石为岩浆成因，206Pb/238U年龄加权平均值为134±1Ma，侵入时代属于早白垩世晚期。石英二长闪长岩中SiO2含量为63.44%~68.96%，K2O含量为2.04%~3.84%，Na2O/K2O值介于0.47~1.17之间，铝饱和指数A/CNK介于2.12~2.55之间，属于钙碱性-高钾钙碱性过铝质花岗岩类。微量元素特征为富集大离子亲石元素（如Rb、K）和活泼不相容元素（如Th、U），强烈亏损高场强元素（如Nb、Ta、P、Ti）。结合区域构造演化背景，该岩体受俯冲流体改造，与早白垩世晚期古太平洋板块斜向俯冲于欧亚大陆之下的弧后伸展减薄等综合作用有关。
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关键词:
- 石英二长闪长岩 /
- 地球化学 /
- LA-MC-ICP-MS锆石U-Pb年龄 /
- 大兴安岭
Abstract:In order to determine the geochronology, petrogenesis and tectonic background of the quartz monzonite diorite rocks in Hanmiao area, the authors conducted the research on petrology by means of LA-MC-ICP-MS zircon U-Pb geochronology and geochemistry. The results show that the zircons from the quartz monzonite diorite rocks are magmatic zircons, and the zircon 206Pb/238U dating yielded 134±1Ma(n=22, MSWD=0.42), suggesting late Early Cretaceous. The values of SiO2, K2O and Na2O/K2O are 63.44%~68.96%, 2.04%~3.84% and 0.47~1.17 respectively. The aluminum saturation indexes (A/CNK) range from 2.12 to 2.55. The rocks thus belong to calc-alkaline-high-K calc-alkaline series. The rocks are enriched in LILE (Rb, K) and incompatible elements(Th, U), strongly depleted in HFSE such as Nb, Ta, P and Ti. Combined with the study of regional tectonics the authors hold that the quartz monzonite diorite rocks might have been affected by subducted slab fluids. It was closely related to back-arc extension tectonics and lithospheric thinning after the subduction of Paleo-Pacific plate towards Eurasia plate.
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致谢: 野外工作中得到吉林大学地质调查研究院内蒙项目组的大力支持，审稿专家认真审阅并提出建设性意见，在此一并表示诚挚的感谢。
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图 2 研究区地质简图
1—石英二长闪长岩；2—晚古生代地层；3—断层；4—采样位置10%，呈叶片状，星散分布，局部见双晶扭折现象。
Figure 2. Geological sketch map of the study area
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图 3 石英二长闪长岩野外露头（a）和镜下照片（b、c，正交偏光）
Pl—斜长石；Kfs—钾长石；Qtz—石英；Bt—黑云母；Hbl—角闪石
Figure 3. Photograph of outcrop(a) and micrographs(b, c) of quartz monzonite diorite
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图 4 石英二长闪长岩锆石阴极发光（CL）图像及测点年龄
Figure 4. Ages and CL images of zircons from the quartz monzonite diorite rocks
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图 5 石英二长闪长岩锆石U-Pb谐和图及206Pb/238U年龄
Figure 5. U-Pb concordia diagram and 206Pb/238U ages of zircon in quartz monzonite diorite rocks
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图 8 稀土元素球粒陨石标准化分布图（a）和微量元素原始地幔标准化蛛网图(b)
Figure 8. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace elements spidergram (b)
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图 9 SiO2-K2O/P2O5(a)和SiO2-K2O/TiO2(b)图解[18]
Figure 9. SiO2-K2O/P2O5(a) and SiO2-K2O/TiO2(b) diagrams of quartz monzonite diorite
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图 10 Th/Zr-Nb/Zr(a)和Nb/Y-Rb/Y图解(b)[24]
Figure 10. Th/Zr-Nb/Zr(a) and Nb/Y-Rb/Y(b) diagrams
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图 11 石英二长闪长岩(Y+Nb)-Rb（a）和Y-Nb图解（b）[26]
Figure 11. (Y+Nb)-Rb(a) and Y-Nb diagrams (b) of quartz monzonite diorite
表 1 石英二长闪长岩LA-MC-ICP-MS锆石U-Th-Pb同位素分析结果
Table 1 LA-MC-ICP-MS zircon U-Th-Pb analytical results of quartz monzonite diorite
测点编号 含量/10-6 Th/U 同位素比值 年龄/Ma Pb U Th 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 1 25 1137 850 0.75 0.0211 0.00021 0.1423 0.0023 0.0489 0.0007 135 1 135 2 142 34 2 11 549 222 0.40 0.0210 0.00024 0.1409 0.0052 0.0487 0.0017 134 2 134 5 135 82 3 13 603 227 0.38 0.0211 0.00022 0.1416 0.0034 0.0486 0.0011 135 1 134 3 131 55 4 10 478 169 0.35 0.0211 0.00022 0.1406 0.0036 0.0484 0.0012 134 1 134 3 119 59 5 17 786 320 0.41 0.0212 0.00022 0.1419 0.0025 0.0486 0.0008 135 1 135 2 130 38 6 10 423 162 0.38 0.0209 0.00022 0.1403 0.0024 0.0488 0.0008 133 1 133 2 138 38 7 21 919 577 0.63 0.0211 0.00024 0.1410 0.0042 0.0485 0.0011 135 2 134 4 122 55 8 11 505 179 0.35 0.0212 0.00022 0.1428 0.0031 0.0489 0.0010 135 1 136 3 143 48 9 10 480 168 0.35 0.0211 0.00022 0.1397 0.0045 0.0481 0.0015 134 1 133 4 104 74 10 14 679 264 0.39 0.0212 0.00022 0.1408 0.0027 0.0483 0.0009 135 1 134 3 112 43 11 11 536 208 0.39 0.0210 0.00021 0.1409 0.0030 0.0486 0.0010 134 1 134 3 126 49 12 13 603 237 0.39 0.0210 0.00022 0.1407 0.0032 0.0485 0.0011 134 1 134 3 125 52 13 21 967 408 0.42 0.0209 0.00021 0.1413 0.0022 0.0492 0.0007 133 1 134 2 155 33 14 14 642 205 0.32 0.0212 0.00021 0.1416 0.0034 0.0484 0.0011 135 1 134 3 119 54 15 13 610 225 0.37 0.0210 0.00021 0.1413 0.0030 0.0489 0.0010 134 1 134 3 144 49 16 18 818 320 0.39 0.0211 0.00022 0.1403 0.0028 0.0482 0.0009 135 1 133 3 111 45 17 14 633 408 0.64 0.0212 0.00021 0.1423 0.0042 0.0488 0.0014 135 1 135 4 137 67 18 11 473 241 0.51 0.0210 0.00022 0.1406 0.0035 0.0486 0.0011 134 1 134 3 131 53 19 12 583 248 0.43 0.0208 0.00021 0.1400 0.0028 0.0488 0.0009 133 1 133 3 137 44 21 13 621 289 0.46 0.0209 0.00021 0.1403 0.0029 0.0487 0.0010 133 1 133 3 132 46 22 17 765 504 0.66 0.0208 0.00021 0.1399 0.0036 0.0487 0.0012 133 1 133 3 134 58 23 5 217 122 0.56 0.0207 0.00024 0.1399 0.0131 0.0491 0.0046 132 2 133 12 152 219 
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表 2 石英二长闪长岩主量、微量和稀土元素分析结果
Table 2 Major, trace elements and REE compositions of quartz monzonite diorite
样品号 PM102-25YQ1 PM102-25YQ2 PM102-25YQ3 PM102-12YQ PM102-14YQ 样品号 PM102-25YQ1 PM102-25YQ2 PM102-25YQ3 PM102-12YQ PM102-14YQ Al2O3 15.16 14.01 14.71 14.29 14.6 Zr 277.72 200.12 259.35 249.59 241.40 CaO 1.24 1.56 2.05 1.11 1.22 Nb 13.84 7.48 8.98 11.84 10.94 Fe2O3 5.63 6.98 6.68 5.44 4.37 Ba 1077.10 407.69 364.62 646.60 680.74 K2O 3.84 2.17 2.04 3.03 3.38 La 32.12 22.09 26.72 30.36 26.62 MgO 1.3 2.48 2.9 1.44 1.33 Ce 60.18 46.02 54.43 61.55 53.55 MnO 0.09 0.11 0.11 0.09 0.1 Pr 7.91 5.72 7.00 7.57 6.74 Na2O 2.08 2.18 2.39 1.46 1.58 Nd 29.85 22.31 27.82 29.04 25.51 P2O5 0.14 0.14 0.16 0.08 0.08 Sm 6.13 5.06 6.17 6.09 5.30 SiO2 65.6 66.1 63.44 67.88 68.96 Eu 1.45 1.09 1.23 1.18 1.11 TiO2 0.67 0.67 0.71 0.68 0.7 Gd 5.81 4.87 5.83 5.86 5.31 FeO 2.66 1.31 2.76 1.99 1.98 Tb 0.86 0.74 0.86 0.88 0.79 H2O+ 3.4 0.3 3.7 4.32 2.62 Dy 5.18 4.49 5.18 5.36 4.75 烧失量 4.26 3.6 4.83 4.5 3.68 Ho 1.12 0.97 1.11 1.15 1.03 总计 101.8 98.01 101.63 101.81 100.92 Er 3.44 2.85 3.33 3.44 3.10 Na2O+K2O 4.49 4.96 5.92 4.35 4.42 Tm 0.54 0.44 0.50 0.53 0.49 Na2O/K2O 0.48 0.47 0.54 1.01 1.17 Yb 3.59 2.96 3.35 3.54 3.22 A/CNK 2.55 2.36 2.12 2.37 2.27 Lu 0.53 0.43 0.48 0.49 0.47 Li 100.65 70.91 72.96 77.78 73.58 Y 30.25 25.46 28.79 29.80 26.53 Be 2.60 3.14 2.68 3.36 1.97 Hf 7.93 5.83 7.49 7.70 7.35 V 96.86 108.10 131.26 141.15 132.29 Ta 1.01 0.60 0.69 1.05 0.88 Cr 35.96 125.49 162.01 93.94 85.17 Th 11.51 8.02 9.10 13.91 12.56 Co 8.14 12.54 16.55 5.64 4.03 U 2.93 2.05 2.21 3.30 2.91 Ni 19.12 76.24 102.73 46.47 33.43 LREE/HREE 6.39 6.21 6.53 5.76 5.97 Ga 24.70 19.52 24.03 23.49 21.83 （La/Yb）N 6.16 5.93 6.41 5.35 5.72 Rb 136.65 90.98 106.54 150.61 136.09 δEu 0.60 0.63 0.73 0.66 0.62 Sr 179.18 179.67 229.60 147.90 143.88 δCe 0.97 0.96 0.90 0.98 0.95
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