Zircon U−Pb age and tectonic setting of the shoshonitic volcanic rocks in the Xirenbudun area, Inner Mongolia
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摘要:
内蒙古希仁布敦地区钾玄质火山岩出露于贺根山缝合带梅劳特乌拉−迪彦庙蛇绿混杂岩带内，岩性为玄武粗安岩和粗安岩，研究其形成时代、岩石成因和构造环境，对探讨贺根山缝合带构造演化具有重要启示。粗安岩锆石LA−ICP−MS U−Pb同位素测年获得206Pb/238U年龄加权平均值为176.3±0.8 Ma，形成时代为早侏罗世。岩石相对富碱Na2O+K2O(5.28%~7.19%, >5%)、高Al2O3(16.13%~17.42%)、高K2O/Na2O值(0.66~1.14, >0.5)、高Fe2O3/FeO值(0.82~1.50, > 0.5)、低TiO2(0.91%~1.16%, <1.3%)，富集Th、U、Sr等大离子亲石元素和轻稀土元素, 亏损 Nb、Ta、Ti等高场强元素。稀土元素含量为168.53×10−6~233.03×10−6，稀土元素配分曲线为右倾式分布。岩石学和岩石地球化学特征表明，希仁布敦地区玄武粗安岩−粗安岩为后造山钾玄质岩石，与古亚洲洋俯冲作用有关，形成于古亚洲洋俯冲板片后撤−断离−后造山伸展构造环境。晚古生代末古亚洲洋俯冲洋壳+俯冲深积物析出流体交代上覆地幔楔，形成贺根山缝合带富集地幔，中生代早期古亚洲洋俯冲板片断离−后造山伸展作用诱发富集地幔部分熔融，产生该区钾玄质岩浆。
Abstract:The shoshonitic volcanic rocks in the Xirenbudun area of Inner Mongolia occur in the Meilaotewula − Diyanmiao ophiolitic melange belt of the Hegenshan suture zone. The volcanic rocks include basaltic trachyandesite and trachyandesite. The study of the formation age,petrogenesis, and tectonic setting in the volcanic rocks has important implications for the tectonic evolution of the Hegenshan suture zone. The zircon LA−ICP−MS U−Pb dating for the trachyandesite yielded a weighted mean 206Pb/238U age of 176.3±0.8 Ma, suggesting that its formation age is Early Jurassic. The volcanic rocks are rich in Na2O+K2O(5.28%~7.19%,>5%), Al2O3(16.13%~17.42%) and high K2O/Na2O ratio (0.66~1.14,>0.5), Fe2O3/FeO ratio (0.82~1.50,>0.5) but low in TiO2 (0.91%~1.16%,<1.3%). The rocks are obviously enriched in Th, U, Sr and LREEs, and depleted in Nb, Ta and Ti,with remarkably negative Nb,Ta,P and Ti anomalies on primitive mantle−normalized incompatible element patterns. The contents of rare earth elements range from 168.53×10−6 to 233.03×10−6. The chondrite normalized REE distribution patterns are of right−inclined shape. The basaltic trachyandesite−trachyandesite belong to post orogenic shoshonitic rocks, were related to the subduction of the Palaeo−Asian Ocean (PAO), and formed in the subsequent subducted slab roll back−break off−post orogenic extension tectonic setting. In the end of Late Paleozoic, the fluids dehydrated from the subducted oceanic crust+sediments of the PAO metasomatized the overlying mantle wedge to form the enriched mantle of the Hegenshan suture. In the Early Mesozoic, the PAO subducted slab break off−the post orogenic extension triggered partial melting of the enriched mantle to produce the shoshonitic magma in this area.
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图 4 希仁布敦钾玄质火山岩TAS分类图解(a，底图据Middlemost,1994)和Na2O–K2O图解(b，底图据Miller et al.，1999)
Figure 4.
图 5 希仁布敦钾玄质火山岩SiO2−K2O分类图解(底图据Peccerillo et al., 1976)
Figure 5.
图 6 希仁布敦钾玄质火山岩稀土元素球粒陨石标准化配分模式(标准化值据Boynton, 1984)
Figure 6.
图 7 希仁布敦钾玄质火山岩微量元素原始地幔标准化蛛网图(标准化值据Sun et al., 1989)
Figure 7.
图 8 希仁布敦钾玄质火山岩Ta/Yb−Th/Yb图解(底图据Mueller et al., 1992)
Figure 8.
图 9 希仁布敦钾玄质火山岩Ce/Yb−Cs/Rb(a)、Ce/Yb−Pb/Ce(b)和 (La/Sm)N−(Ba/La)N(c)图解(a, b底图据 Sun et al. , 2001; c底图据 Othman et al., 1989)
Figure 9.
图 10 希仁布敦钾玄质火山岩TiO2/Al2O3−Zr/Al2O3(a)和3Zr−50Nb−Ce/P2O5(b)判别图解(底图据 Mueller et al., 1992)
Figure 10.
表 1 希仁布敦钾玄质火山岩(PT134)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 Xirenbudun shoshonitic volcanic rocks
点号 元素含量/10−6 Th/U
同位素比值 表面年龄/Ma Pb U 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ 206Pb/238U 1 85 2092 1.9399 0.0497 1.12 0.1897 1.42 0.0277 1.06 176 ±2 2 40 1009 1.7461 0.0482 2.08 0.1849 2.47 0.0278 0.95 177 ±2 3 67 1638 1.8170 0.0477 1.15 0.1856 1.44 0.0282 1.22 179 ±2 4 108 2909 1.5326 0.0483 1.08 0.1839 1.52 0.0276 1.06 176 ±2 5 44 1173 1.5199 0.0512 1.23 0.1958 1.45 0.0277 1.13 176 ±2 6 51 1336 1.5992 0.0542 1.14 0.2088 1.36 0.0280 1.06 178 ±2 7 80 2084 1.4926 0.0487 6.29 0.1880 5.63 0.0280 0.88 178 ±2 8 64 1597 1.9786 0.0496 1.02 0.1876 1.22 0.0274 1.18 174 ±2 9 40 997 1.5956 0.0513 2.60 0.2017 2.90 0.0285 1.00 181 ±2 10 82 2190 1.4508 0.0494 6.90 0.1891 3.86 0.0278 1.09 177 ±2 11 37 994 1.7245 0.0485 1.87 0.1814 1.72 0.0271 1.26 173 ±2 12 129 3189 1.8387 0.0514 1.66 0.1991 2.18 0.0281 1.02 179 ±2 13 58 1461 1.8778 0.0497 1.09 0.1915 1.37 0.0280 1.38 178 ±2 14 44 1070 1.9406 0.0507 1.63 0.1941 2.33 0.0277 1.29 176 ±2 15 56 1061 1.9523 0.0505 4.67 0.1900 5.11 0.0273 1.10 173 ±2 16 112 2176 1.9426 0.0539 9.40 0.2083 9.92 0.0280 0.85 178 ±2 17 75 2057 1.5861 0.0511 1.13 0.1960 1.12 0.0278 1.18 177 ±2 18 106 2653 2.1731 0.0508 1.19 0.1908 1.86 0.0273 0.97 173 ±2 19 4 140 0.7880 0.0498 5.57 0.1838 6.20 0.0268 1.02 170 ±2 20 45 1122 1.9914 0.0528 4.94 0.1997 6.59 0.0274 1.19 174 ±2 21 46 1221 1.8398 0.0521 1.34 0.1978 1.67 0.0275 1.14 175 ±2 22 78 2147 1.6415 0.0488 1.12 0.1861 1.14 0.0277 1.08 176 ±2 23 28 821 1.2241 0.0534 1.82 0.2030 1.85 0.0276 1.03 175 ±2 24 32 863 1.7207 0.0488 1.74 0.1871 1.81 0.0278 0.93 177 ±2 25 85 2082 2.2431 0.0480 1.46 0.1847 1.37 0.0279 0.92 177 ±2 注：实验测试在天津地质矿产研究所完成 
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表 2 希仁布敦钾玄质火山岩的主量、微量和稀土元素分析结果
Table 2. Major, trace element and REE analyses of the Xirenbudun shoshonitic volcanic rocks
样品号
岩性PT131
玄武粗安岩PT132
玄武粗安岩PT133
玄武粗安岩PT134
粗安岩PT135
粗安岩PT136
粗安岩PT137
粗安岩SiO2 54.34 56.47 57.05 58.18 59.35 60.67 61.30 Al2O3 17.42 16.58 17.05 16.13 16.67 16.99 17.14 TiO2 1.16 0.98 1.01 0.97 0.97 0.93 0.91 Fe2O3 3.78 3.15 2.92 3.58 3.51 3.42 3.46 FeO 3.09 3.69 3.54 2.49 2.51 2.39 2.30 CaO 7.12 6.61 5.51 5.96 3.87 3.41 3.37 MgO 2.44 2.30 2.87 2.91 2.34 2.07 1.87 K2O 2.31 2.19 2.47 2.60 3.26 3.76 3.83 Na2O 3.52 3.09 3.07 3.66 3.64 3.33 3.36 MnO 0.12 0.09 0.16 0.10 0.08 0.09 0.09 P2O5 0.33 0.26 0.27 0.27 0.31 0.28 0.27 烧失量 4.17 4.42 3.84 2.95 3.05 2.47 1.96 总计 99.80 99.83 99.77 99.80 99.56 99.83 99.86 La 40.59 33.88 34.05 29.73 34.58 38.12 37.13 Ce 86.90 72.21 72.50 63.24 67.50 68.60 63.14 Pr 12.00 10.10 10.42 8.84 9.76 9.84 10.13 Nd 49.66 41.75 42.78 36.54 39.92 41.23 37.10 Sm 10.07 8.42 8.42 7.12 7.82 8.23 7.54 Eu 2.41 1.92 2.09 1.89 1.94 2.15 1.92 Gd 8.37 6.97 7.11 5.88 6.51 6.99 6.30 Tb 1.38 1.28 1.17 0.97 1.07 1.22 1.12 Dy 7.89 7.04 6.42 5.32 5.74 6.00 5.35 Ho 1.58 1.44 1.29 1.06 1.15 1.22 1.13 Er 4.93 4.50 3.77 3.34 3.47 3.21 3.63 Tm 0.76 0.68 0.56 0.50 0.52 0.63 0.50 Yb 5.24 4.84 3.67 3.28 3.36 3.59 3.34 Lu 1.23 1.12 0.81 0.82 0.87 0.67 0.77 ΣREE 233.03 196.15 195.05 168.53 184.21 191.70 179.09 Y 33.18 30.95 26.75 22.34 24.19 24.81 24.33 Cr 37.07 53.17 66.62 81.70 47.39 52.14 48.57 Co 20.40 18.64 21.20 19.50 16.18 17.43 16.52 Ni 13.11 15.00 19.41 18.90 15.14 16.12 15.42 Rb 57.94 51.57 51.27 53.52 51.83 41.60 40.26 Sr 822.12 570.73 756.13 675.40 696.21 711.30 629.96 Zr 259.00 252.00 227.60 228.80 265.80 249.60 254.90 Nb 11.75 10.42 10.36 10.94 11.84 11.45 11.73 Cs 4.21 12.64 6.16 1.93 8.55 11.43 9.16 Ba 426.10 483.60 859.80 631.50 566.18 489.40 432.05 Hf 6.82 7.28 6.25 6.06 7.14 6.81 6.98 Ta 0.85 0.80 0.79 0.85 0.88 0.83 0.85 Pb 26.47 32.32 16.49 13.51 37.31 42.22 46.57 Th 15.90 14.64 9.99 8.71 12.61 11.19 13.26 U 3.05 3.22 2.74 2.76 2.23 2.73 2.45 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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