Zircon U-Pb dating of the Shijiangshan Late Jurassic-Early Cretaceous A-type granite in Xi Ujimqin Banner of Inner Mongolia and its tectonic setting
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摘要:
内蒙古西乌旗石匠山A型花岗岩位于贺根山缝合带内，侵位于早石炭世迪彦庙-白音布拉格蛇绿岩带和下二叠统寿山沟组与大石寨组中，岩性为二长花岗岩。石匠山A型花岗岩富硅（SiO2=74.18%~77.16%）、富钾（K2O=4.31%~5.07%）、富碱（Na2O+K2O=8.44%~9.16%），贫Al2O3、CaO、MgO、TiO2、P2O5、Sr、Ba、Eu、Ti和P，具有较高的Ga/Al（3.98~6.09）、（Na2O+K2O）/CaO、K2O/MgO、TFeO/MgO、Rb/Nb、Y/Nb、Sc/Nb值，稀土元素配分曲线为典型的海鸥式分布，δEu为0.01~0.19，负Eu异常显著，明显不同于I、S和M型花岗岩，为典型的铝质A型花岗岩。在地球化学分类判别图解上，石匠山A型花岗岩显示A2型后造山铝质花岗岩特征，反映其形成于后造山伸展环境。LA-ICP-MS锆石U-Pb测年结果表明，该花岗岩的侵位年龄为159.8±1.3Ma、143.1±1.3Ma、136.20±0.69Ma，即形成时代为晚侏罗世-早白垩世，揭示贺根山缝合带在晚侏罗世-早白垩世为后造山伸展阶段。
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关键词:
- 铝质A型花岗岩 /
- LA-ICP-MS锆石U-Pb定年 /
- 晚侏罗世-早白垩世 /
- 后造山伸展环境 /
- 内蒙古西乌旗
Abstract:Lying along the Hegenshan collisional orogenic suture zone in Xi Ujimqin Banner of Inner Mongolia, the Shijiangshan Atype granite intruded into Early Carboniferous Diyanmiao-Baiyinbulage ophiolite as well as Early Permian Shoushangou Formation and Dashizhai Formation, and consists mainly of monzogranites. The granite is geochemically characterized by high SiO2 (74.18%~77.16%), K2O (4.31%~5.07%), high absolute alkali values (Na2O+K2O=8.44%~9.16%), low Al2O3, CaO, MgO, TiO2, P2O5, Sr, Ba, Eu, Ti, P values, and higher Ga/Al (3.98~6.09), (Na2O+K2O)/CaO, K2O/MgO, TFeO/MgO, Rb/Nb, Y/Nb, Sc/Nb ratios. It is characterized by typical flat or slight right-inclined gull-wing shaped REE distribution patterns with obvious negative Eu anomalies (δEu=0.01~0.19). The Shijiangshan monzogranite exhibits typical geochemical characteristics of A-type granite, being significantly different from I, S and M type granites in geochemistry. According to the chemical subdivision diagrams of the A-type granitoids, the Shijiangshan A-type granite belongs to aluminous A2-type granitoid, formed and emplaced in a post-orogenic extension setting. LAICP-MS zircon U-Pb dating shows that the ages of the granite are 159.8±1.3Ma, 143.1±1.3Ma and 136.20±0.69Ma, suggesting that it was produced during Late Jurassic to Early Cretaceous and that the Hegenshan suture zone was at the post orogenic extension stage in the Late Jurassic-Early Cretaceous period.
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表 1 石匠山A型花岗岩LA-ICP-MS锆石U-Th-Pb测试结果
Table 1. LA-ICP-MS U-Th-Pb dating of zircons from the Shijiangshan A-type granite
测点 元素含量/10-6 Th/U 同位素原子比值 表面年龄/Ma Pb U Th 206Pb/238U ±% 207Pb/235U ±% 207Pb/206Pb ±% 206Pb/238U TWS01 1 53 2112 734 0.35 0.0510 15 0.179 1.2 0.0255 2.1 162 ±1 2 44 1708 610 0.36 0.0522 15 0.181 1.2 0.0251 2.0 160 ±2 3 32 1235 834 0.68 0.0510 7.5 0.177 2.4 0.0252 1.1 160 ±2 4 20 547 342 0.63 0.0535 8.6 0.186 2.2 0.0252 1.2 161 ±2 5 11 425 198 0.47 0.0509 11 0.180 1.7 0.0256 1.5 163 ±2 6 58 2083 1158 0.56 0.0505 9.1 0.178 2.0 0.0256 1.3 163 ±2 7 17 638 253 0.40 0.0505 13 0.177 1.4 0.0254 1.8 162 ±2 8 14 551 197 0.36 0.0500 14 0.170 1.2 0.0247 2.0 157 ±1 9 7 275 409 1.49 0.0548 3.6 0.183 5.1 0.0242 0.47 154 ±3 10 36 1481 750 0.51 0.0516 10 0.174 1.7 0.0245 1.4 156 ±1 11 7 287 91 0.32 0.0488 15 0.166 1.1 0.0246 2.3 157 ±1 12 10 387 188 0.49 0.0486 9.9 0.164 1.7 0.0245 1.5 156 ±2 13 22 788 352 0.45 0.0567 13 0.198 1.6 0.0253 1.6 161 ±2 14 74 2737 869 0.32 0.0475 15 0.171 1.2 0.0260 2.3 166 ±2 15 68 2351 840 0.36 0.0496 14 0.175 1.3 0.0256 2.0 163 ±2 16 61 2393 1093 0.46 0.0514 11 0.181 1.6 0.0255 1.6 162 ±2 17 33 1225 693 0.57 0.0512 9.0 0.177 2.0 0.0251 1.3 160 ±1 18 82 3318 955 0.29 0.0499 17 0.173 1.0 0.0251 2.5 160 ±2 19 110 3074 1190 0.39 0.0547 14 0.186 1.3 0.0247 1.9 157 ±2 20 48 1872 985 0.53 0.0537 10 0.187 1.8 0.0252 1.4 160 ±2 TWS02 1 168 7124 3182 0.45 0.0492 1.0 0.157 1.2 0.0231 1.0 147 ±2 2 175 7534 3066 0.41 0.0503 1.1 0.157 1.0 0.0226 1.3 144 ±2 3 85 3403 2669 0.78 0.0511 4.8 0.160 3.7 0.0228 1.4 145 ±2 4 3 77 69 0.89 0.0497 8.8 0.157 3.3 0.0230 2.4 146 ±3 5 13 413 180 0.44 0.0523 9.1 0.163 3.4 0.0227 2.5 144 ±4 6 81 3208 1433 0.45 0.0509 2.1 0.154 2.8 0.0219 1.3 140 ±2 7 333 15004 3873 0.26 0.0482 1.1 0.152 1.2 0.0228 1.1 145 ±2 8 19 824 540 0.66 0.0484 1.1 0.149 1.1 0.0224 0.71 143 ±1 9 63 2518 1050 0.42 0.0497 0.99 0.153 1.4 0.0223 1.1 142 ±2 10 15 575 314 0.55 0.0475 5.2 0.151 6.1 0.0230 1.1 147 ±2 11 30 1296 720 0.56 0.0494 1.3 0.154 1.4 0.0227 1.4 144 ±2 12 271 11777 6196 0.53 0.0522 0.96 0.162 1.3 0.0225 1.3 144 ±2 13 101 4523 1167 0.26 0.0491 1.3 0.156 1.2 0.0231 2.6 147 ±4 14 83 3572 1454 0.41 0.0494 2.6 0.157 3.1 0.0231 1.3 147 ±2 15 82 3621 1869 0.52 0.0546 1.2 0.164 1.5 0.0217 0.83 139 ±1 16 46 367 215 0.59 0.0535 2.3 0.158 2.4 0.0215 0.83 137 ±2 17 65 2010 2793 1.39 0.0485 2.1 0.146 2.9 0.0218 1.7 139 ±2 18 16 2937 875 0.30 0.0479 1.0 0.148 1.3 0.0224 0.79 143 ±1 19 48 682 278 0.41 0.0544 1.7 0.167 2.0 0.0222 1.0 142 ±1 TWS03 1 66 3012 1346 0.45 0.0501 1.8 0.149 2.2 0.0215 1.0 137 ±1 2 45 2081 1322 0.64 0.0545 2.7 0.157 2.1 0.0209 1.0 134 ±1 3 59 2685 1333 0.50 0.0496 1.4 0.146 1.0 0.0214 1.3 137 ±2 4 47 2124 991 0.47 0.0489 0.97 0.146 1.1 0.0217 1.2 138 ±2 5 18 847 311 0.37 0.0499 1.9 0.148 2.1 0.0215 1.2 137 ±2 6 13 595 201 0.34 0.0498 4.1 0.147 4.6 0.0214 1.1 136 ±2 7 46 2115 819 0.39 0.0527 1.7 0.155 1.4 0.0214 1.2 136 ±2 8 66 2992 1247 0.42 0.0527 1.0 0.157 0.89 0.0217 1.2 138 ±2 9 8 397 300 0.75 0.0535 6.1 0.150 6.0 0.0204 0.94 130 ±1 10 59 2722 1216 0.45 0.0477 1.4 0.141 1.2 0.0215 1.1 137 ±1 11 50 2333 1181 0.51 0.0500 0.94 0.147 1.2 0.0213 1.1 136 ±1 12 60 2699 1474 0.55 0.0491 0.93 0.146 1.2 0.0215 1.2 137 ±2 13 29 1236 1227 0.99 0.0531 4.2 0.155 3.0 0.0212 1.1 135 ±1 14 134 6460 2309 0.36 0.0480 0.79 0.137 0.93 0.0207 1.2 132 ±2 15 74 3443 1230 0.36 0.0483 0.95 0.142 1.5 0.0214 1.3 136 ±2 16 70 3211 1403 0.44 0.0490 0.90 0.145 0.96 0.0215 0.93 137 ±1 17 52 2344 1233 0.53 0.0493 1.60 0.145 1.7 0.0213 1.1 136 ±2 18 63 2917 1390 0.48 0.0492 0.98 0.144 1.2 0.0212 1.2 135 ±2 19 64 2906 1385 0.48 0.0472 0.89 0.140 1.1 0.0215 1.3 137 ±2 20 68 3117 1269 0.41 0.0489 0.92 0.144 1.0 0.0214 1.2 137 ±2 注：误差为1σ；Pb*代表放射成因铅 
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表 2 石匠山A型花岗岩的主量、微量和稀土元素分析结果
Table 2. Major, trace element and REE analyses of the Shijiangshan A-type granite
样品号
(岩性）ST01
(zcπηγJ3)ST03
(xπηγβJ3)ST05
(zcπηγβJ3)ST07
(zcηγβK1)ST09
(zcηγK1)ST11
(zcηγK1)ST13
(zcηγK1)ST15
(zcηγK1)世界A型花岗岩平均（148) 中国A型花岗岩平均（197) SiO2 74.68 76.07 74.18 77.16 77.08 76.33 76.92 75.52 73.81 73.55 TiO2 0.182 0.080 0.120 0.051 0.049 0.062 0.040 0.081 0.26 0.23 Al2O3 13.3 12.99 13.69 12.54 12.4 12.42 12.65 12.72 12.40 12.81 Fe2O3 0.73 0.61 1.19 0.68 0.54 0.89 0.53 0.80 1.24 1.42 FeO 1.01 0.26 0.34 0.12 0.26 0.12 0.12 0.92 1.58 1.18 MnO 0.0300 0.0100 0.0170 0.0130 0.0061 0.0072 0.089 0.050 0.060 0.090 MgO 0.220 0.073 0.079 0.062 0.081 0.038 0.041 0.100 0.20 0.27 CaO 0.26 0.32 0.36 0.24 0.44 0.77 0.33 0.63 0.75 0.82 Na2O 4.15 3.93 4.09 4.13 3.93 3.90 4.20 4.05 4.07 3.76 K2O 4.32 4.85 5.07 4.31 4.54 4.75 4.57 4.51 4.65 4.69 P2O5 0.046 0.019 0.023 0.013 0.016 0.018 0.011 0.023 0.040 0.070 烧失量 1.01 0.74 0.83 0.66 0.64 0.67 0.55 0.52 总计 99.94 99.95 99.99 99.98 99.98 99.98 99.97 99.92 Ba 144.10 48.31 37.04 24.51 25.23 21.54 32.88 7.24 352 235.96 Rb 253.60 383.04 228.51 229.12 302.03 345.41 276.61 284.00 169 269.69 Sr 34.29 14.18 9.73 8.56 7.12 6.90 16.5 7.64 48 57.54 Zr 238.50 117.32 220.03 117.56 115.91 89.62 112.21 180.00 528 333.77 Pb 19.48 29.70 18.62 24.23 17.71 16.91 13.22 24 Zn 38.70 32.91 50.77 24.52 21.41 26.49 16.50 Cu 3.60 2.31 3.91 2.12 4.80 3.00 2.30 2 Ni 3.90 2.61 2.22 1.80 1.75 2.67 2.50 < 1 V 10.20 4.70 3.03 7.30 3.10 1.61 2.29 3.02 6 Cr 6.14 5.40 4.22 4.02 3.71 3.20 3.30 3.94 Hf 8.56 5.71 11.48 6.86 6.71 4.17 6.56 9.45 Sc 2.64 2.00 2.10 0.62 2.20 1.81 1.30 6.23 4.0 Ta 4.39 7.45 1.92 3.32 4.01 2.88 2.84 1.90 Nb 28.76 33.07 14.90 18.79 22.56 23.05 15.40 17.40 37 34.93 U 2.57 4.06 2.32 3.90 3.27 5.37 3.27 1.86 5.00 Th 14.68 14.33 10.58 12.97 15.43 29.98 31.31 27.60 23 Ga 32.21 29.81 28.80 30.90 34.22 34.70 27.90 41.01 24.6 18.54 Y 60.87 56.46 27.00 26.15 60.67 72.91 35.72 27.10 75 54.03 Rb/Sr 7.39 26.97 23.67 26.57 42.65 50.01 16.79 37.17 3.52 4.69 K/Rb 141.41 105.12 184.15 156.17 124.82 114.23 137.24 131.83 229 Ga/Al 4.57 4.34 3.98 4.66 5.21 5.29 4.16 6.09 3.75 La 24.49 20.08 46.83 8.75 8.78 21.80 24.99 17.00 Ce 104.80 48.99 148.20 28.91 26.66 56.82 40.29 26.90 Pr 6.57 5.44 10.02 2.50 4.66 8.47 9.41 6.36 Nd 22.81 18.02 34.26 9.33 21.61 36.52 39.21 25.8 Sm 5.79 3.57 5.16 2.42 7.84 10.64 10.18 6.3 Eu 0.37 0.15 0.12 0.050 0.060 0.061 0.11 0.016 Gd 6.37 3.06 4.75 2.46 6.46 8.82 6.84 5.38 Tb 1.55 0.64 0.68 0.66 1.51 1.85 1.31 0.96 Dy 10.75 4.24 3.71 4.77 9.64 10.94 7.08 5.21 Ho 2.31 0.94 0.77 1.08 2.00 2.20 1.26 0.94 Er 6.66 2.94 2.27 3.19 5.64 5.84 3.33 2.59 Tm 1.24 0.62 0.42 0.63 1.05 1.01 0.60 0.44 Yb 7.3 4.11 2.74 3.88 6.23 5.69 3.65 2.65 Lu 1.2 0.66 0.49 0.80 1.12 0.83 0.69 0.40 ΣREE 202.21 113.46 260.46 69.43 103.25 171.49 148.96 100.95 δEu 0.19 0.14 0.07 0.07 0.03 0.02 0.04 0.01 (La/Yb)N 2.26 3.29 11.53 1.52 0.95 2.58 4.62 4.33 注：主量元素含量单位为%，稀土、微量元素含量为10-6。zcπηγJ3—中粗粒似斑状二长花岗岩；xπηγβJ3—细粒似斑状黑云母二长花岗岩；zcηγβK1—中粗粒黑云母二长花岗岩；zcηγK1—中粗粒二长花岗岩
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① 辽宁省第二区域地质测量队. L-50-35(白塔子庙幅)1: 200000地质图说明书, 1972.
② 沈阳地质矿产研究所. L50C004003(西乌珠穆沁旗幅)1: 250000区域地质调查报告, 2004.
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