Geochemical characteristics, formation age and tectonic environment of the Mankeyidingsayi rocks in the Wuxilike area of Altay
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摘要:
阿尔泰乌希里克地区位于西伯利亚板块阿尔泰陆缘活动带的阿尔泰古生代深成岩浆弧内，花岗岩广泛分布。通过对满克依顶萨依岩体进行LA-ICP-MS锆石U-Pb测年和岩石地球化学分析，探讨该岩体形成的时代及构造环境。乌希里克南部满克依顶萨依岩体中细粒白云母二长花岗岩的LA-ICP-MS锆石U-Pb年龄为217.9±2.3Ma，表明岩体侵位于早中生代晚三叠世早期。岩石具有高的SiO2（70.86%~74.32%）和Al2O3（14.51%～14.96%）含量，低P2O5（0.24%~0.33%）和MgO+FeO（0.39%~1.25%）含量，富碱（K2O+Na2O=8.07%~8.29%），具有低的CaO/Na2O值（0.13~0.30，≤0.3）。以上特征表明，该岩体属高钾钙碱性过铝质岩类，具有S型花岗岩的典型特征。结合前人研究成果综合分析，推测岩体形成于板内（陆内）环境，与地幔柱有关。岩体主要由源自地壳的泥质沉积物部分熔融形成，在部分熔融过程中有富钙的斜长石、钛铁矿等矿物的残留。
Abstract:The Wuxilike area of Altay is located in Siberian Altay terrigenous mobile belt and the Altay Paleozoic plutonic magmatic arc, where granite is widely distributed. By LA-ICP-MS zircon U-Pb dating and geochemical analysis, the authors studied the age and tectonic environment of the Makeyidingshayi granite body. The LA-ICP-MS zircon U-Pb age of the medium-fine grained muscovite adamellite of Mankeyidingsayi granite body in southern Wuxilike area is 217.9±2.3Ma, showing that the granite body was emplaced in the early Late Triassic of the early-Mesozoic. The rocks have high SiO2 (70.86%~74.32%) and Al2O3 (14.51%~14.96%), low P2O5 (0.24%~0.33%) and MgO+FeO (0.39%~1.25%) content, high alkali (K2O+Na2O=8.07%~8.29%), and low CaO/Na2O (0.13~0.30, ≤0.3) ratio. These characteristics indicate that the granite body belongs to high-K calc-alkaline peraluminous rocks, with the typical features of S-type granites. In combination with the work and the results from previous comprehensive analysis, the authors infer that the granite body was formed in an intercontinental (inland) environment, related to the mantle plume. The granite body was mainly derived from partial melting of argillaceous sediments in the crust, and during the partial melting process, residuals of calcium-rich plagioclase, ilmenite and other minerals were preserved.
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Keywords:
- geochemical characteristics /
- formation age /
- tectonic environment /
- Mankeyidingsayi /
- Wuxilike /
- Altay
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致谢: 成文过程中承蒙中国地质调查局西安地质调查中心贺永康高级工程师和该中心国土资源部岩浆作用成矿与找矿重点实验室李艳广工程师悉心指导和修改，中国地质大学（北京）地球科学与资源学院李大鹏博士进行指导，中国地质大学（武汉）地质过程与矿产资源国家重点实验室及中国冶金地质总局山东局测试中心提供测试数据，在此一并表示诚挚的谢意。
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图 1 阿尔泰造山带区域地质及花岗岩分布略图（据参考文献[13]修改）
Figure 1. Geological sketch map of the Altay orogenic belt, showing the distribution of granites
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图 2 研究区侵入岩分布简图
1—中细粒白云母二长花岗岩；2—粗中粒二长花岗岩；3—中粗粒似斑状二云母二长花岗岩；4—实测性质不明断层；5—推测性质不明断层；6—实测正断层；7—实测整合岩层界线；8—花岗岩体脉动接触界线；9—同位素样品采样点；Qhal+pl—全新统冲洪积；Qp3gl—上更新统冰碛堆积；Qp2+3gl—中-上更新统冰碛堆积；Z∈1k2—震旦系-寒武系喀纳斯群；ηγmT31—晚三叠世中细粒白云母二长花岗岩；ηγT31—晚三叠世粗中粒二长花岗岩；ηγβmT31—晚三叠世中粗粒似斑状二云母二长花岗岩；δψO2—中晚奥陶世变质角闪石闪长岩；Pt2S—中元古界苏普特岩群
Figure 2. The distribution of intrusive rocks in the study area
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图 3 花岗伟晶岩脉侵入中细粒白云母二长花岗岩
Figure 3. The photograph of granitic pegmatite vein which intruded into medium-fine grained muscovite adamellite
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图 4 满克依顶萨依岩体中细粒白云母二长花岗岩锆石阴极发光（CL）图像（年龄/Ma）
Figure 4. Cathodoluminescence image of zircons in medium-fine grained muscovite adamellite of the Mankeyidingsayi granite body
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图 5 中细粒白云母二长花岗岩的U-Pb锆石谐和年龄图
Figure 5. U-Pb concordia diagram for zircons from mediumfine grained muscovite adamellite
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图 6 花岗岩QAP图解
1—富石英花岗岩；2—碱长花岗岩；3a—花岗岩；3b—花岗岩（二长花岗岩）；4—花岗闪长岩；5—英云闪长岩、斜长花岗岩；6*—碱长石英正长岩；7*—石英正长岩；8*—石英二长岩；9*—石英二长闪长岩；10*—石英闪长岩、石英辉长岩、石英斜长岩
Figure 6. QAP diagrams for granite
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图 7 SiO2-K2O岩石系列判别图（底图据参考文献[21]）
Figure 7. SiO2-K2O rock series discrimination diagram
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图 10 花岗岩球粒陨石标准化稀土元素配分曲线图（标准化值据参考文献[23]）
Figure 10. Chondrite-normalized REE patterns of granite
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图 11 花岗岩微量元素蛛网图（标准化值据参考文献[23]）
Figure 11. Primitive mantle-normalized trace element spidergrams of granites
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图 12 花岗岩成因分类R1-R2构造判别图解（底图据参考文献[35]）
①—地幔斜长花岗岩；②—破坏性活动板块边缘（板块碰撞前）；③—板块碰撞后隆起期花岗岩；④—晚造山期花岗岩；⑤—非造山区A型花岗岩；⑥—同碰撞（S型）花岗岩；⑦—造山期后A型花岗岩
Figure 12. R1-R2 tectonic discrimination diagram for granite genetic classification
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图 13 花岗岩Yb-Ta构造环境判别图解（底图据参考文献[36]）
syn-COLG—同碰撞花岗岩；WPG—板内花岗岩；ORG—岛弧花岗岩；VAG—洋脊花岗岩
Figure 13. Yb-Ta tectonic environment discrimination diagram of granite
表 1 中细粒白云母二长花岗岩的LA-ICP-MS锆石U-Th-Pb年龄测试数据
Table 1 LA-ICP-MS zircon U-Th-Pb data of the medium-fine grained muscovite adamellite
测点号 Pb/10-6 Th/10-6 U/10-6 232Th/238U 同位素比值 年龄/Ma 207Pb/206Pb 1σ 207Pb/235Pb 1σ 206Pb/238Pb 1σ 207Pb/206Pb 1σ 207Pb/235Pb 1σ 206Pb/238Pb 1σ PM12-TW17-2 110 611 643 0.95 0.0522 0.0037 0.24 0.02 0.0342 0.0006 295 164 222 13 217 4 PM12-TW17-3 105 678 508 1.33 0.0494 0.0043 0.23 0.02 0.0335 0.0005 165 202 207 16 212 3 PM12-TW17-4 94 427 1256 0.34 0.0482 0.0026 0.23 0.01 0.0343 0.0005 109 122 208 10 218 3 PM12-TW17-5 57 365 331 1.10 0.0511 0.0058 0.24 0.03 0.0350 0.0007 256 231 216 21 221 4 PM12-TW17-6 101 618 572 1.08 0.0512 0.0039 0.24 0.02 0.0344 0.0006 256 178 216 14 218 4 PM12-TW17-7 294 514 2189 0.23 0.0567 0.0018 0.63 0.02 0.0795 0.0010 480 69 493 13 493 6 PM12-TW17-9 199 119 6894 0.02 0.0499 0.0015 0.24 0.01 0.0352 0.0004 191 70 222 6 223 2 PM12-TW17-10 613 1550 3920 0.40 0.0521 0.0015 0.35 0.01 0.0480 0.0006 300 60 302 8 302 4 PM12-TW17-11 14 89 67 1.33 0.0596 0.0180 0.25 0.07 0.0361 0.0013 587 550 229 54 229 8 PM12-TW17-16 99 515 1049 0.49 0.0478 0.0025 0.23 0.01 0.0349 0.0005 100 109 211 10 221 3 PM12-TW17-19 176 827 2568 0.32 0.0498 0.0018 0.24 0.01 0.0344 0.0004 183 118 216 7 218 3 PM12-TW17-21 148 992 689 1.44 0.0499 0.0030 0.24 0.01 0.0343 0.0005 191 136 215 12 217 3 PM12-TW17-22 111 417 1853 0.23 0.0507 0.0021 0.24 0.01 0.0336 0.0004 233 96 215 8 213 2 PM12-TW17-23 373 2484 1245 2.00 0.0523 0.0023 0.25 0.01 0.0343 0.0004 298 100 224 9 218 2 注：中国地质大学（武汉）地质过程与矿产资源国家重点实验室测试，2014 
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表 2 满克依顶萨依二长花岗岩类岩石主量、微量及稀土元素化学成分
Table 2 Abundances of major, trace and rare earth elements of the adamellite in Mankeyidingsayi
岩性 灰白色中细粒白云
母二长花岗岩灰白色粗中粒
二长花岗岩灰白色似斑状
二云母二长花岗岩样号 PM12-GS13 PM12-GS32 PM12-GS29 PM12-GS37 SiO2 73.08 74.32 72.9 70.86 TiO2 0.14 0.06 0.3 0.32 Al2O3 14.74 14.54 14.51 14.96 Fe2O3 1 0.48 1.72 1.77 FeO 0.37 0.18 0.65 0.74 MnO 0.05 0.04 0.07 0.05 MgO 0.34 0.21 0.57 0.51 CaO 0.55 0.55 0.92 0.96 Na2O 3.52 4.16 3.31 3.15 K2O 4.57 4.12 4.76 6.5 P2O5 0.33 0.24 0.32 0.29 LOI 1 0.87 0.83 0.63 Total 99.32 99.58 100.2 99.99 Na2O+K2O 8.09 8.29 8.07 9.65 K2O/Na2O 1.3 0.99 1.44 2.06 σ 2.18 2.19 2.18 3.34 AR 3.25 3.44 3.19 4.08 DI 92.38 94.14 89.63 90.64 SI 3.49 2.25 5.14 4 A/NK 1.37 1.28 1.37 1.22 A/CNK 1.26 1.18 1.18 1.07 Li 204 85.6 133 112 Be 9.02 11.1 20.6 12.1 Sc 2.85 2.06 4.99 4.62 V 9.17 3.03 22.4 22.6 Cr 2.11 0.61 2.82 4.67 Mn 347 272 483 352 Co 105 79.8 70.8 82.4 Ni 2.72 2.3 3.3 4.06 Cu 8.7 3.77 12.4 9.75 Zn 51.9 15.7 63.1 58 Ga 26.1 25.1 25.5 22.9 Ge 1.5 1.57 1.63 1.39 Rb 495 359 416 390 Sr 27 21.4 144 218 Y 7.74 6.79 15.2 16.9 Zr 70.9 20.7 152 188 Nb 25.6 24.8 31.3 22.3 Mo 0.23 0.16 0.51 0.8 Sn 3.79 1.93 4.16 3.73 Cs 25.5 13.4 26.6 17.8 Ba 53.6 21.1 278 585 Hf 2.53 1.01 4.48 5.14 Ta 4.6 4.05 6.21 2.82 Tl 3.2 2.11 2.59 2.63 Pb 19.3 21.4 27.9 43 Bi 7.88 0.17 0.62 0.35 Th 11.3 1.94 21.5 24.5 U 3.29 1.69 21.2 7.17 La 12.63 2.98 38.71 46.55 Ce 28.56 6.21 80.81 95.64 Pr 3.45 0.68 9.3 10.95 Nd 12.78 2.31 33.77 38.79 Sm 2.97 0.57 6.01 7.19 Eu 0.31 0.12 0.88 1.21 Gd 2.05 0.55 4.08 4.66 Tb 0.29 0.12 0.56 0.63 Dy 1.51 0.81 3 3.44 Ho 0.25 0.18 0.51 0.57 Er 0.63 0.68 1.39 1.57 Tm 0.09 0.14 0.21 0.23 Yb 0.63 1.17 1.5 1.62 Lu 0.09 0.19 0.2 0.23 ΣREE 66.25 16.72 180.94 213.28 LREE 60.7 12.87 169.47 200.32 HREE 5.55 3.85 11.46 12.95 LREE/HREE 10.95 3.34 14.78 15.46 LaN/YbN 14.45 1.82 18.48 20.57 δEu 0.36 0.62 0.51 0.6 注：主量元素含量单位为%；微量和稀土元素含量为10-6；由中国冶金地质总局山东局测试中心测试，2014
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