Zircon U-Pb dating and tectonic setting of the Wulan'gou adakite in Inner Mongolia
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摘要:
内蒙古中部贺根山缝合带的梅劳特乌拉蛇绿岩中，新发现乌兰沟埃达克岩，岩性为花岗闪长岩。LA-ICP-MS锆石UPb测年结果表明，乌兰沟埃达克岩的侵位年龄为279.3±1.4Ma，其形成时代为早二叠世。乌兰沟埃达克岩SiO2含量为65.92%~69.65%，MgO为1.34%~2.16%，Al2O3为15.30%~17.33%，Na2O/K2O值为3.95~14.09，Sr=359.60×10-6~734.00×10-6，Yb=0.83×10-6~2.02×10-6，Y=6.65×10-6~12.84×10-6；富集K、Rb、Sr等大离子亲石元素，亏损Nb、Ta、Ti、P等高场强元素；稀土元素总量为32.18×10-6~65.41×10-6，明显较低，轻、重稀土元素分馏明显，（La/Yb）N值为2.84~7.56，无明显Eu异常，显示出高硅埃达克岩（HSA）的地球化学特征。该埃达克岩具有岛弧型岩浆岩特征，形成于俯冲带岛弧环境，可能为洋内俯冲洋壳+俯冲深积物部分熔融并与上覆地幔楔橄榄岩反应成因。根据乌兰沟埃达克岩与梅劳特乌拉蛇绿岩的时空分布与演化特征，贺根山缝合带在早二叠世可能存在洋内俯冲作用。
Abstract:The newly recognized Wulan'gou adakite in the Meilaotewula ophiolite along the Hegenshan suture zone in Inner Mongolia consists mainly of granodiorites. The LA-ICP-MS zircon U-Pb dating shows that the age of the adakite is 279.3±1.4Ma, suggesting a product of Early Permian. The rock has high SiO2 (65.92%~69.65%), Al2O3 (15.30%~17.33%), Sr(359.60×10-6~734.00×10-6), and low MgO(1.34%~2.16%), Yb(0.83×10-6~2.02×10-6), Y(6.65×10-6~12.84×10-6) content, with Na2O/K2O ratio varying from 3.95 to 14.09. The adakiteis enriched in large ion lithophile elements K, Rb and Sr, and depleted in high field strength elements Nb, Ta, Ti and P. The total REE is low(32.18×10-6~65.41×10-6), whereas REE fractionation is clear((La/Yb)N=2.84~7.56), without obvious Eu anomaly. All of the geochemical characteristics indicate that the Wulan'gou pluton belongs to high-SiO2 adakites (HSA). The adakiteis characterized by the island-arc magmatite generated in subduction zone, which suggests that it might have been formed in an island arc setting in petrology and geochemistry. It might have been derived from the intra-oceanic subducted oceanic crust plus sediment partial melting and subsequently melts reaction with overlying mantle wedge peridotite. According to the temporal and spatial distribution and evolution characteristics of the rock assemblage series of pillow tholeiite, boninite, Nb-enriched basalt, High-Mg diorite and adakite in the Meilaotewula ophiolite, the authors suggest that there might have been an intra-oceanic subduction in the Hegenshan suture zone during the Early Permian period.
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致谢: 审稿专家对稿件提出了建设性的修改意见，在此表示衷心的谢意。
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图 3 乌兰沟埃达克岩野外（a）和显微照片（b，糜棱结构）
Pl—斜长石；Q—石英；Kfs—钾长石；Hb—角闪石
Figure 3. Outcrop(a)and microphotograph (b) of the Wulan'gou adakite
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图 4 乌兰沟埃达克岩（BX14）锆石阴极发光图像及其206Pb/238U年龄
Figure 4. Cathodoluminescent images and 206Pb/238U ages of zircons from the Wulan'gou adakite
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图 5 乌兰沟埃达克岩（BX14）锆石U-Pb谐和图（a）和206Pb/238U年龄直方图（b）
Figure 5. U-Pb concordia diagram(a)and 206Pb/238U age histograms(b)of zircons from the Wulan'gou adakite
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图 6 乌兰沟埃达克岩TAS分类图解[24]
Figure 6. Total alkali versus silica(TAS) diagram of the Wulan'gou adakite
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图 7 乌兰沟埃达克岩SiO2-K2O分类图解[25]
Figure 7. SiO2-K2O classification diagram of the Wulan'gou adakite
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图 10 乌兰沟埃达克岩SiO2-MgO（a）、(CaO+NaO2)-Sr（b）、Y-Sr/Y（c）和SiO2-Nb（d）图解[24]
Figure 10. SiO2-MgO(a), (CaO+NaO2)-Sr (b), Y-Sr/Y(c)and SiO2-Nb(d)diagrams of the Wulan'gou adakite
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图 11 乌兰沟埃达克岩(Y+Nb)-Rb构造判别图解[52]
syn-COLG —同碰撞花岗岩；VAG—火山弧花岗岩；WPG—板内花岗岩；ORG—洋脊花岗岩
Figure 11. (Y+Nb)-Rb tectonic discriminant diagram of the Wulan'gou adakite
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图 12 乌兰沟埃达克岩Th-La/Yb构造判别图解[53]
Figure 12. Th-La/Ybtectonic discriminant diagram of the Wulan'gou adakite
表 1 乌兰沟埃达克岩（BX14）LA-ICP-MS锆石U-Th-Pb测试结果
Table 1 LA-ICP-MS U-Th-Pb dating results of zircons from the Wulan'gou adakite(BX14)
点号 Pb/10-6 U/10-6 Th/U 同位素原子比率 表面年龄/Ma 207Pb*/206Pb* ±% 207Pb*/235U ±% 206Pb*/238u ±% 206Pb/238U 1 6 137 0.22 0.0545 11 0.3362 10 0.04471 1.2 282 ±3 2 8 164 0.21 0.0523 16 0.3328 16 0.04623 1.2 291 ±3 3 5 124 0.19 0.0528 12 0.3258 12 0.04482 1.1 282 ±3 4 8 183 0.22 0.0545 10 0.3310 9.4 0.04404 1.0 278 ±3 5 8 190 0.20 0.0532 6.9 0.3250 6.9 0.04429 0.92 280 ±3 6 16 369 0.26 0.0522 4.3 0.3153 4.3 0.04376 0.82 276 ±2 7 5 110 0.20 0.0534 14 0.3315 13 0.04501 1.4 284 ±4 8 5 115 0.22 0.0594 13 0.3644 13 0.04448 1.8 281 ±5 9 15 354 0.24 0.0566 3.6 0.3430 3.6 0.04397 0.83 277 ±2 10 7 155 0.23 0.0562 8.7 0.3440 8.5 0.04435 0.98 280 ±3 11 10 230 0.25 0.0579 7.7 0.3518 7.8 0.04401 0.87 278 ±2 12 6 140 0.27 0.0519 18 0.3303 17 0.04623 1.1 291 ±3 13 5 114 0.27 0.0517 12 0.3118 12 0.04372 1.1 276 ±3 14 5 127 0.23 0.0519 13 0.3158 13 0.04413 1.0 278 ±3 15 4 90 0.26 0.0574 13 0.3479 12 0.04402 1.3 277 ±4 16 5 100 0.30 0.0514 17 0.3209 16 0.04518 1.1 285 ±3 17 2 55 0.22 0.0838 21 0.5081 20 0.04404 2.2 278 ±6 18 5 109 0.28 0.0540 15 0.3289 14 0.04436 1.1 279 ±3 19 14 354 0.063 0.0547 3.8 0.3275 3.9 0.04354 0.91 274 ±2 20 18 422 0.21 0.0499 4.0 0.3022 4.1 0.04392 0.83 277 ±2 21 13 301 0.16 0.0624 7.0 0.3846 7.1 0.04471 0.89 282 ±3 22 12 270 0.23 0.0515 5.8 0.3214 5.8 0.04529 0.83 286 ±2 23 11 252 0.25 0.0522 7.4 0.3181 7.5 0.04416 0.88 279 ±2 24 11 249 0.27 0.0505 6.7 0.3071 6.6 0.04411 0.90 278 ±2 25 5 122 0.20 0.0631 10.6 0.3816 10 0.04393 1.1 277 ±3 26 13 306 0.30 0.0541 5.3 0.3269 5.3 0.04392 0.86 277 ±2 27 6 133 0.20 0.0521 10 0.3195 10 0.04465 1.0 280 ±3 28 13 312 0.19 0.0511 4.5 0.3092 4.6 0.04381 0.83 277 ±2 29 12 270 0.18 0.0589 5.9 0.3601 6.2 0.04438 0.86 280 ±2 30 11 258 0.20 0.0520 5.8 0.3128 5.7 0.04356 0.85 275 ±2 注：误差为1σ；Pb*指示放射成因铅。实验测试在天津地质矿产研究所完成 
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表 2 乌兰沟埃达克岩主量、微量和稀土元素分析结果
Table 2 Major elements, trace elements and REE analyses of the Wulan'gou adakite in the Meilaote ophiolite
样号 BX11(xγδP1) BX12(xγδP1) BX13(xγδP1) BX14((zγδP1) BX15(xγδP1) BX16(xγδP1) 高Si埃达克岩 SiO2 66.80 65.92 69.65 68.82 66.68 68.35 64.80 TiO2 0.40 0.45 0.20 0.42 0.32 0.51 0.56 Al2O3 16.59 17.25 17.08 15.79 17.33 15.30 16.64 Fe2O3 1.47 0.83 1.72 1.60 1.16 2.12 4.75 FeO 1.53 2.13 0.65 1.14 1.03 1.32 MnO 0.061 0.052 0.034 0.068 0.029 0.054 0.081 MgO 1.73 2.16 1.59 1.44 1.60 1.34 2.18 CaO 3.56 2.79 1.83 3.67 4.65 2.70 4.63 Na2O 4.88 5.03 5.44 4.70 5.71 4.41 4.19 K2O 0.96 1.04 0.72 0.51 0.41 1.12 1.97 P2O5 0.1：0 0.102 0.052 0.110 0.131 0.161 0.200 烧失量 1.78 2.16 1.00 1.65 0.86 2.47 总计 99.88 99.90 99.96 99.91 99.90 99.86 Mg# 52 57 56 50 58 43 48 La 8.79 7.05 4.97 5.43 9.91 10.57 19.20 Ce 18.99 16.11 11.75 14.30 21.18 19.64 37.30 Pr 3.06 2.21 1.63 1.88 3.14 3.42 Nd 13.26 9.46 6.65 8.41 13.08 14.93 18.20 Sm 3.14 2.11 1.53 1.95 2.72 4.09 3.40 Eu 1.04 0.82 0.59 0.69 0.81 1.22 0.90 Gd 2.77 2.12 1.36 1.72 2.35 3.51 2.80 Tb 0.52 0.38 0.23 0.31 0.38 0.56 Dy 2.92 2.10 1.36 1.78 1.97 2.71 1.90 Ho 0.59 0.46 0.26 0.32 0.34 0.54 Er 1.94 1.64 0.73 0.89 0.98 1.65 0.96 Tm 0.27 0.21 0.13 0.15 0.14 0.28 Yb 1.75 1.68 0.83 0.85 0.88 2.02 0.88 Lu 0.27 0.24 0.16 0.11 0.17 0.28 0.17 ∑REE 59.30 46.58 32.18 38.79 58.06 65.41 Y 12.84 9.69 6.65 7.99 7.27 12.31 10.00 Ba 166.30 118.40 100.50 135.20 146.50 580.80 721.00 Rb 15.98 20.72 5.50 6.10 6.58 32.62 52.00 Sr 622.52 447.88 359.60 734.00 669.32 437.11 565.00 Zr 90.90 94.70 73.90 110.00 110.70 102.00 108.00 Nb 1.77 1.39 1.94 1.78 1.83 4.26 6.00 Th 4.37 3.02 1.97 1.34 2.43 3.45 Ni 19.52 23.30 3.60 11.20 17.24 10.32 20.00 V 61.81 53.32 18.90 49.00 56.35 74.87 95.00 Cr 37.24 30.98 4.30 16.50 44.67 26.09 41.00 Hf 5.83 5.25 3.59 4.97 3.38 8.76 Sc 9.25 8.48 3.74 6.91 7.52 6.04 Ta 0.22 0.19 0.21 0.18 0.24 0.39 Co 9.20 9.41 2.40 8.50 9.80 7.56 Li 7.10 10.03 7.44 15.74 3.33 13.35 U 0.60 0.49 0.51 0.24 0.50 0.89 注:主量元素含量单位为%，稀土、微量元素为10-6；xγδP1—细粒花岗闪长岩，zγδP1—中粒花岗闪长岩，高Si埃达克岩为267个样品的平均值[24]
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