Zircon U-Pb dating, geochemistry and tectonic implications of the Artala Middle Triassic A-type granite in Inner Mongolia
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摘要:
在内蒙古二连-贺根山缝合带新发现西乌旗阿尔塔拉A型花岗岩，岩性为二长花岗岩。锆石LA-ICP-MS U-Pb测年结果显示，该二长花岗岩的侵位年龄为242.9±1.5Ma，形成时代为中三叠世。阿尔塔拉A型花岗岩地球化学特征为高钾钙碱性系列，具有较高的SiO2（75.89%~76.79%）、K2O（4.18%~4.30%）和Na2O+K2O（8.23%~8.57%），贫CaO、MgO、Sr、Ba、Eu、Ti和P，相对富集Ga、Rb和Th。该岩石稀土元素配分曲线为海鸥式，具有显著的负Eu异常（δEu=0.11~0.14）。在地球化学判别图解上，阿尔塔拉A型花岗岩显示A2型后造山花岗岩特征，其形成于后造山伸展环境。结合二连-贺根山缝合带蛇绿岩、岛弧型-后造山型岩浆岩的时空演化关系，古亚洲洋二连-贺根山洋盆可能在二叠纪晚期闭合，并在三叠纪进入后造山伸展构造演化时期。
Abstract:The newly recognized Artala A-type granite occurs along the Erenhot-Hegenshan suture in Xi Ujimqin Banner of Inner Mongolia and is composed of monzogranite.LA-ICP-MS zircon U-Pb dating yielded a weighted average age of 242.9±1.5Ma.The age suggests that the granite was emplaced in the Middle Triassic.The granite belongs to high-K Calc-alkaline series, and is characterized by rich SiO2(75.89%~76.79%) and K2O(4.18%~4.30%), high alkali(Na2O+K2O=8.23%~8.57%), low CaO, MgO, Sr, Ba, Eu, Ti, P, and relatively high Ga, Rb and Th. In addition, it has lower total rare earth element (REE) content with obviously negative Eu anomalies(δEu=0.11~0.14), showing a typical flat gull-wing shaped REE distribution pattern.The Artala monzogranite exhibits the typical geochemical characteristics of A-type granites. According to the chemical subdivision diagrams of the A-type granitoids, the Artala A-type granite belongs to A-type granitoid, which was formed and emplaced in a post-collisional extension setting. Based on the previous studies of the time-space evolution of the ophiolites, arc granitoids, and post-collisional granitoids in the Erenhot-Hegenshan suture, the authors suggest that the Erenhot-Hegenshan oceanic basin of the Paleo-Asian Ocean was probably closed at the end of the Permian and that the Erenhot-Hegenshan suture entered the post-collisional extension tectonic evolution period in Triassic.
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致谢: 审稿专家提出了宝贵的修改意见，对本文的改进和提高起了重要作用，在此表示衷心感谢。
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图 1 内蒙古西乌旗阿尔塔拉A型花岗岩区域构造(a, 据参考文献[7]修改)和地质简图(b)
Figure 1. Sketch tectonic(a)and geological(b)maps of the Artala A-type granite in Xi Ujimqin Banner, Inner Mongolia
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图 2 阿尔塔拉A型花岗岩野外(a)和显微照片(b)
a—二长花岗岩；b—条纹结构。Or—正长石；Pth—条纹长石；Pl—斜长石；Q—石英
Figure 2. Representative field photo(a)and photomicrograph(b)of the Artala A-type granite
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图 3 阿尔塔拉A型花岗岩(AP07)锆石阴极发光图像及其206Pb/238U年龄
Figure 3. Cathodoluminescence images and 206Pb/238U ages of zircons from the Artala A-type granite
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图 4 阿尔塔拉A型花岗岩(AP07)锆石LA-ICP-MS U-Pb年龄谐和图(a)和206Pb/238U年龄直方图(b)
Figure 4. U-Pb concordia diagram of zircons from the Artala A-type granite
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图 5 阿尔塔拉A型花岗岩铝饱和指数(A/NK-A/CNK)图解[36]
IAG—岛弧花岗岩类；CAG—大陆弧花岗岩类；CCG—大陆碰撞花岗岩类；POG—后造山花岗岩类；RRG—与裂谷有关的花岗岩类；CEUG—与大陆的造陆抬升有关的花岗岩类；OP—大洋斜长花岗岩类
Figure 5. Shand's index of the Artala A-type granite
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图 6 阿尔塔拉A型花岗岩SiO2-K2O分类图解[37]
Figure 6. SiO2-K2O classification diagrams of the Artala A-type granite
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图 7 阿尔塔拉A型花岗岩稀土元素球粒陨石标准化配分模式[39]
Figure 7. Chondrite-normalized REE patterns of the Artala A-type granite
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图 8 阿尔塔拉A型花岗岩微量元素原始地幔标准化蛛网图[40]
Figure 8. Primitive mantle-normalized trace element spider diagram of the Artala A-type granite
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图 9 阿尔塔拉A型花岗岩10000×Ga/Al对(K2O+Na2O)/CaO(a)、TFeO/MgO(b)、K2O/MgO(c)和Nb(d)判别图解[42]
Figure 9. (K2O+Na2O)/CaO(a), TFeO/MgO(b), K2O/MgO(c)and Nb (d) versus 10000×Ga/Al discrimination diagrams of the Artala A-type granite
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图 10 阿尔塔拉A型花岗岩A1和A2型花岗岩类Y-Nb-3Ga(a)和Y-Nb-Ce(b)三角形判别图解[38]
A1—非造山花岗岩；A2—造山后花岗岩
Figure 10. Y-Nb-3Ga(a)and Y-Nb-Ce(b)triangular plots for distinguishing between A1 and A2 granitoids from the Artala A-type granite
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图 11 阿尔塔拉A型花岗岩R1-R2构造环境判别图解
Figure 11. R1-R2 tectonic discriminant diagram of the Artala A-type granite
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图 12 阿尔塔拉A型花岗岩SiO2-TFeO/(TFeO+MgO)(a)和SiO2-Al2O3(b)构造环境判别图解
IAG—岛弧花岗岩类；CAG—大陆弧花岗岩类；CCG—大陆碰撞花岗岩类；POG—后造山花岗岩类；RRG—与裂谷有关的花岗岩类；CEUG—与大陆的造陆抬升有关的花岗岩类
Figure 12. SiO2-TFeO/(TFeO+MgO)(a)and SiO2-Al2O3 (b)tectonic discriminant diagrams of the Artala A-type granite
表 1 阿尔塔拉A型花岗岩(AP07)LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 1 LA-ICP-MS U-Th-Pb dating of zircons from the Artala A-type granite
点号 元素/10-6 Th/U 同位素原子比率 表面年龄/Ma Pb U 207Pb*/206Pb* ±% 207Pb*/235U ±% 206Pb*/238U ±% 206Pb/238U 1.1 18 444 0.49 0.0518 1.8 0.281 1.8 0.0393 1.3 248 ±3 2.1 14 369 0.25 0.0521 1.3 0.279 1.4 0.0388 0.97 246 ±2 3.1 28 704 0.37 0.0513 0.79 0.277 0.90 0.0391 0.87 247 ±2 4.1 29 700 0.61 0.0511 0.67 0.273 0.72 0.0387 1.1 245 ±3 5.1 18 417 0.59 0.0527 1.6 0.279 1.8 0.0383 1.1 242 ±3 6.1 35 831 0.37 0.0535 2.5 0.277 2.4 0.0375 1.2 237 ±3 7.1 25 643 0.23 0.0516 1.5 0.273 1.3 0.0384 1.4 243 ±3 8.1 37 739 0.67 0.0578 9.8 0.301 5.8 0.0378 1.2 239 ±3 9.1 17 354 0.57 0.0574 4.3 0.302 5.2 0.0382 1.4 241 ±3 10.1 67 1598 0.38 0.0524 2.3 0.279 1.8 0.0386 1.0 244 ±2 11.1 74 1562 0.72 0.0519 2.8 0.273 3.2 0.0381 1.1 241 ±3 12.1 57 1451 0.48 0.0535 1.4 0.277 1.3 0.0376 1.3 238 ±3 13.1 35 803 0.45 0.0531 7.2 0.281 6.6 0.0384 1.0 243 ±2 14.1 13 339 0.40 0.0534 1.7 0.276 1.7 0.0374 1.0 237 ±2 15.1 22 547 0.36 0.0517 1.5 0.279 1.6 0.0391 1.2 247 ±3 16.1 39 1010 0.26 0.0518 1.2 0.278 1.5 0.0389 0.99 246 ±2 17.1 26 647 0.53 0.0527 1.6 0.277 1.7 0.0381 1.1 241 ±3 18.1 18 489 0.27 0.0527 1.1 0.276 1.1 0.0381 1.3 241 ±3 19.1 15 396 0.43 0.0532 1.6 0.278 1.7 0.0379 1.3 240 ±3 20.1 24 546 0.60 0.0537 2.7 0.286 2.4 0.0387 1.1 245 ±3 21.1 17 459 0.25 0.0550 1.0 0.292 1.2 0.0385 1.0 243 ±3 22.1 15 340 0.49 0.0559 8.6 0.298 8.4 0.0387 1.1 245 ±3 注：误差为1σ；Pb*指示放射成因铅。实验测试在天津地质调查中心完成 
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表 2 阿尔塔拉A型花岗岩的主量、微量和稀土元素分析结果
Table 2 Major elements, trace elements and REE analyses of the Artala A-type granite
元素 AP05
二长花岗岩AP06
二长花岗岩AP07
二长花岗岩AP08
二长花岗岩AP09
二长花岗岩SiO2 76.43 75.89 76.76 76.79 76.51 TiO2 0.021 0.040 0.040 0.039 0.030 Al2O3 13.34 13.82 13.19 13.17 13.29 Fe2O3 0.41 0.24 0.37 0.36 0.37 FeO 0.14 0.10 0.15 0.18 0.16 MnO 0.040 0.033 0.024 0.035 0.041 MgO 0.041 0.081 0.020 0.020 0.05 CaO 0.57 0.56 0.60 0.59 0.53 Na2O 4.32 4.23 4.05 4.03 4.21 K2O 4.25 4.30 4.18 4.21 4.24 P2O5 0.010 0.011 0.011 0.010 0.011 烧失量 0.43 0.67 0.60 0.55 0.51 总计 100 99.97 99.98 99.98 99.95 Ba 24.7 66.1 59.6 67.3 44.57 Rb 221.0 211.4 214.0 207.0 214.5 Sr 11.97 20.60 18.40 19.10 17.27 Zr 53.60 58.50 58.00 57.40 59.24 Pb 35.42 27.00 32.00 31.40 31.70 Zn 22.77 16.80 16.40 16.80 18.61 Cu 9.56 6.39 2.41 3.53 6.32 Ni 2.84 7.89 1.19 1.77 4.52 V 5.03 10.20 26.71 20.30 16.35 Hf 2.66 3.68 3.08 3.01 3.19 Sc 3.12 3.18 4.41 3.99 3.71 Ta 2.26 3.60 2.64 2.59 3.23 Nb 10.51 15.30 10.20 10.10 11.57 U 5.02 1.94 2.93 2.76 3.46 Th 10.43 14.21 16.00 14.50 10.38 Ga 20.67 20.01 19.20 19.70 24.98 Cs 4.29 4.51 5.52 5.53 6.43 Y 33.87 27.41 22.20 21.70 49.85 La 5.56 6.37 4.46 4.62 5.29 Ce 12.89 14.57 10.10 10.90 12.97 Pr 1.85 2.07 1.36 1.34 1.69 Nd 7.70 9.04 5.99 5.75 7.45 Sm 2.84 3.27 2.12 2.14 3.14 Eu 0.10 0.13 0.10 0.10 0.12 Gd 2.86 3.46 2.35 2.15 3.47 Tb 0.73 0.86 0.60 0.59 0.83 Dy 5.05 5.39 3.78 3.93 6.07 Ho 1.08 1.09 0.73 0.72 1.12 Er 3.05 3.47 2.14 2.07 3.21 Tm 0.56 0.62 0.39 0.41 0.65 Yb 3.33 4.32 2.59 2.85 4.27 Lu 0.54 0.81 0.37 0.41 0.69 ΣREE 48.14 55.47 37.09 38.03 47.83 δEu 0.11 0.12 0.14 0.14 0.11 (La/Yb)N 1.13 0.99 1.16 1.09 0.84 注：主量元素含量单位为%，稀土、微量元素含量单位为10-6
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