LA-ICP-MS zircon U-Pb geochronology and geochemistry of the porphyroclastic lava and rhyolite in west Taipusi Banner area of Inner Mongolia
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摘要:
内蒙古西太仆寺破火山内碎斑熔岩与流纹岩的LA-ICP-MS锆石U-Pb定年结果分别为140.1±0.6Ma和138.3±0.9Ma，为早白垩世初期岩浆活动的产物。2类岩石具有一致的地球化学特征，都表现出高硅，富碱，贫钙、镁、钛、磷的特征，属于高钾钙碱性系列；铝饱和指数A/CNK=0.99~1.13，主要为过铝质岩石。岩石富集Rb、Th、U等大离子亲石元素，强烈亏损Ti、Nb、Ta等高场强元素，强烈负Eu异常（δEu=0.06~0.24），稀土元素配分图呈右倾的海鸥型。Ba、Sr也表现出强烈亏损的特征。此外，岩石还具有高的TFeO/MgO（5.64~43.29）和104×Ga/Al（2.96~4.41）值。地球化学特征表明，碎斑熔岩和流纹岩具有铝质A型花岗岩的特征，可能是在区域岩石圈伸展环境下，深部软流圈的上涌和幔源镁铁质岩浆的底侵作用，对上覆地壳直接的加热作用促使其部分熔融形成的。
Abstract:LA-ICP-MS zircon U-Pb dating was carried out for two samples of porphyroclastic lava and rhyolite from the west Taipusi Banner, Inner Mongolia. As a result, their ages were obtained, which are 140.1±0.6Ma and 138.3±0.9Ma, respectively. The results show that all the rocks were produced by magmatic activities in Early Cretaceous. Porphyroclastic lava and rhyolite have the same geochemical features, characterized by high content of SiO2, Na2O+K2O and low CaO, MgO, TiO2 and P2O5, and belonging to the high-K calc-alkaline series. A/CNK values of the rocks are from 0.99 to 1.13, suggesting that they are peraluminous. The rocks are characterized by LILE enrichment (Rb, Th, U) and HFSE (Ti, Nb, Ta) strong depletion. They are characterized by enriched LREE patterns with strong negative Eu anomalies (δEu=0.06~0.24), with high TFeO/MgO(5.64~43.29) and 104×Ga/Al(2.96~4.41) ratios, and strong depletion of Ba and Sr. All these geochemical data indicate that they are mainly aluminous A-type granite. Under the regional lithospheric extension, the asthenosphere upwelling and mafic magma underplating provided enhanced heat flux and triggered the partial melting of the overlying crust and then produced the porphyroclastic lava and rhyolite.
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图 5 西太仆寺旗碎斑熔岩与流纹岩104×Ga/Al与Y、Zr、Nb、Ce、Na2O+K2O、（Na2O+K2O）/CaO、K2O/MgO和TFeO/MgO关系图(I、S、M、A分别表示I型、S型、M和A型花岗岩，分界线据参考文献[21])
Figure 5.
表 1 西太仆寺旗流纹岩和碎斑熔岩主量、微量和稀土元素含量
Table 1. Major, trace and rare earth element compositions of rhyolite and porphyroclastic lava from west Taipusi Banner
样号 TP-12 TP-027 TP-029 TP-142B TP-143 TP-154B TP-249 TP-089 TP-138 TP-139 TP-154 TP-197 TP-246 TP-252 TP-216 TP-230 岩性 流纹岩 流纹岩 流纹岩 流纹岩 流纹岩 流纹岩 流纹岩 碎斑熔岩 碎斑熔岩 碎斑熔岩 碎斑熔岩 碎斑熔岩 碎斑熔岩 碎斑熔岩 碎斑熔岩 碎斑熔岩岩 SiO2 75.30 75.74 75.52 74.79 74.04 75.75 74.77 76.28 76.38 75.61 76.40 75.64 75.97 77.20 75.63 75.95 Al2O3 12.11 12.15 12.14 12.16 11.93 11.77 12.08 11.96 11.92 12.26 12.40 12.42 12.40 11.97 12.40 12.41 Fe2O3 2.08 0.04 1.33 1.49 2.16 1.42 2.01 0.95 0.05 0.56 0.22 0.60 0.85 0.13 0.57 1.00 FeO 0.34 1.61 0.86 1.04 0.61 0.82 0.65 0.56 1.25 0.82 0.72 0.82 0.47 0.80 0.85 0.36 MgO 0.05 0.08 0.08 0.10 0.24 0.12 0.14 0.20 0.13 0.18 0.13 0.22 0.14 0.14 0.24 0.11 CaO 0.16 0.30 0.13 0.20 0.30 0.15 0.14 0.40 0.60 0.65 0.39 0.75 0.42 0.32 0.37 0.47 Na2O 3.79 3.70 3.70 2.97 2.19 3.36 2.93 3.35 3.41 3.41 3.13 3.51 3.38 3.50 3.01 3.41 K2O 5.09 5.12 5.08 5.68 5.93 5.22 5.88 4.85 4.95 5.18 5.25 4.90 5.17 4.72 5.18 5.14 MnO 0.03 0.01 0.01 0.02 0.02 0.01 0.07 0.03 0.05 0.05 0.01 0.04 0.01 0.01 0.02 0.07 TiO2 0.19 0.20 0.18 0.21 0.21 0.20 0.21 0.14 0.15 0.18 0.20 0.19 0.20 0.14 0.18 0.20 P2O5 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.03 0.03 0.03 0.02 0.03 0.03 烧失量 0.68 0.78 0.75 1.20 2.17 0.96 0.96 1.12 0.96 0.90 1.04 0.72 0.90 0.87 1.34 0.73 总和 99.84 99.74 99.81 99.88 99.83 99.80 99.85 99.85 99.86 99.82 99.92 99.83 99.94 99.81 99.81 99.88 TFeO 2.21 1.65 2.06 2.38 2.55 2.10 2.45 1.42 1.29 1.32 0.92 1.36 1.24 0.92 1.36 1.26 A/CNK 1.01 1.00 1.03 1.07 1.13 1.03 1.06 1.04 0.99 0.99 1.07 1.00 1.04 1.05 1.10 1.03 A/NK 1.03 1.04 1.05 1.10 1.19 1.05 1.08 1.11 1.09 1.09 1.14 1.12 1.11 1.10 1.17 1.11 T/℃ 917 883 887 943 904 919 930 820 797 833 854 820 818 809 815 812 Pb 27.6 31.2 34.7 23.7 27.7 23.0 35.5 21.9 25.4 25.3 26.6 24.3 21.0 21.4 21.6 24.2 Sc 2.13 1.63 1.88 2.82 2.14 1.66 2.13 2.94 3.14 3.67 3.48 3.45 3.33 3.07 3.08 3.70 V 15.20 10.80 13.30 3.78 16.40 5.15 12.50 9.05 5.97 3.49 4.44 6.81 6.97 7.33 7.78 20.40 Cr 6.63 5.41 8.02 2.80 7.37 6.58 4.29 5.10 4.17 0.96 1.38 4.35 2.39 3.24 2.10 5.51 Co 0.36 0.13 0.36 0.41 0.37 0.27 0.32 0.65 0.30 0.45 0.40 0.54 0.51 0.19 0.47 0.70 Ni 6.07 1.25 3.60 2.13 2.93 2.74 2.36 1.22 1.95 0.14 0.19 2.96 1.70 0.82 0.95 2.46 Ga 26.1 27.3 26.5 26.4 25.7 27.5 26.6 21.6 22.9 21.6 22.9 22.4 20.3 21.8 19.4 23.0 Rb 251 278 271 271 268 250 269 263 216 198 218 253 190 203 231 209 Sr 9.0 7.9 6.6 13.0 20.2 7.6 21.8 13.3 12.5 28.5 28.4 36.2 32.8 10.4 20.9 33.5 Ba 43.7 17.3 33.6 87.2 331 24.9 45.9 48.3 46.4 118 139 145 168 34.0 121 211 Zr 605 438 443 706 467 590 642 215 179 267 297 230 214 190 194 202 Hf 15.3 10.7 12.2 16.8 12.1 14.9 15.2 6.7 5.9 7.6 7.9 7.0 6.2 6.5 6.5 6.2 Th 25.9 30.9 26.5 26.0 25.9 20.7 26.8 33.2 30.2 29.7 32.8 33.6 28.3 29.9 29.7 31.2 U 2.50 1.71 2.47 2.29 2.33 2.33 2.73 3.79 4.34 3.95 2.47 4.21 2.47 3.09 1.73 2.30 Y 40.5 45.5 32.8 19.5 27.9 39.1 50.5 24.1 23.5 22.5 24.0 31.1 13.0 22.5 13.4 23.9 Nb 32.5 35.6 37.8 35.0 34.2 38.5 34.4 24.1 21.6 21.3 24.1 27.9 20.5 23.1 23.7 23.0 Ta 2.40 1.86 2.02 2.53 2.17 1.34 2.57 0.79 1.47 1.56 1.93 1.38 1.57 1.76 1.54 1.64 La 87.9 117 65.1 58.7 112 68.4 78.6 72.0 106 111 122 99.1 56.5 118 47.3 120 Ce 153 175 120 77.2 132 115 172 122 173 180 208 166 139 159 110 195 Pr 18.2 23.5 13.8 14.0 22.1 15.2 17.0 15.1 20.2 20.9 25.6 19.6 11.1 22.5 9.15 24.5 Nd 65.2 84.0 47.4 48.0 82.2 53.2 60.4 51.6 67.5 70.7 87.6 67.5 36.6 75.8 30.2 83.1 Sm 10.7 13.5 7.7 7.6 13.2 8.8 10.6 8.5 9.9 10.0 12.4 10.7 5.3 10.8 4.6 11.5 Eu 0.24 0.28 0.18 0.23 0.37 0.18 0.22 0.14 0.28 0.37 0.45 0.39 0.37 0.19 0.21 0.47 Gd 8.62 11.10 6.04 5.14 9.43 6.63 9.41 6.56 6.89 6.57 8.88 7.80 3.70 7.95 3.40 7.89 Tb 1.47 1.81 1.15 0.82 1.38 1.20 1.67 0.99 0.97 0.93 1.23 1.24 0.55 1.12 0.54 1.07 Dy 7.74 8.66 6.20 4.11 6.07 6.85 9.35 4.85 4.62 4.55 5.15 5.87 2.72 4.80 2.75 5.08 Ho 1.38 1.51 1.16 0.75 1.02 1.46 1.72 0.85 0.79 0.75 0.88 1.03 0.48 0.83 0.49 0.84 Er 3.97 3.71 3.73 2.27 3.09 4.48 5.29 2.36 2.33 2.11 2.39 2.81 1.37 2.36 1.51 2.31 Tm 0.64 0.56 0.72 0.38 0.50 0.77 0.84 0.43 0.34 0.36 0.32 0.46 0.23 0.36 0.29 0.35 Yb 3.83 3.50 4.33 2.96 3.87 4.89 5.34 2.51 2.04 2.04 2.00 2.74 1.49 1.99 1.77 1.99 Lu 0.63 0.48 0.57 0.42 0.52 0.66 0.79 0.33 0.31 0.31 0.32 0.35 0.25 0.30 0.28 0.30 δEu 0.07 0.07 0.08 0.10 0.10 0.07 0.07 0.06 0.08 0.13 0.12 0.12 0.24 0.06 0.16 0.14 104×Ga/Al 4.07 4.24 4.12 4.10 4.07 4.41 4.16 3.41 3.63 3.33 3.49 3.41 3.09 3.44 2.96 3.50 TFeO/MgO 43.29 20.82 25.13 23.30 10.46 16.90 17.78 7.27 9.85 7.55 6.89 6.32 8.84 6.69 5.64 11.92 ΣREE 363.5 444.6 278.1 222.5 387.8 287.7 373.2 288.2 395.1 410.6 477.2 385.6 259.7 406.0 212.5 454.4 LREE 335.2 413.3 254.2 205.7 361.9 260.8 338.8 269.3 376.8 393.0 456.1 363.3 248.9 386.3 201.5 434.6 HREE 28.3 31.3 23.9 16.9 25.9 26.9 34.4 18.9 18.3 17.6 21.2 22.3 10.8 19.7 11.0 19.8 LREE/ HREE 11.86 13.19 10.64 12.21 13.98 9.68 9.85 14.27 20.61 22.31 21.55 16.29 23.08 19.60 18.27 21.91 (La/Yb)N 16.46 23.98 10.78 14.22 20.76 10.03 10.56 20.58 37.27 39.03 43.76 25.94 27.20 42.53 19.17 43.25 注：A/CNK=Al2O3/(CaO+Na2O+K2O)，A/NK= Al2O3/(Na2O+K2O)摩尔数之比；T（℃）为据Watson等[16]的锆石饱和温度；主量元素含量单位为%，微量和稀土元素含量为10-6 
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表 2 西太仆寺旗流纹岩和碎斑熔岩LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 2. LA-ICP-MS zircon U-Th-Pb isotope dating for the rhyolite and porphyroclastic lava from west Taibus Banner
点号分析 含量/10-6 Th/U 207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U 206Pb/238U Th U Pb 测值 1σ 测值 1σ 测值 1σ 年龄/Ma 1σ 年龄/Ma 1σ 年龄/Ma 1σ HB-274玻质碎斑熔岩 01 189 361 9.70 0.52 0.0504 0.0020 0.1512 0.0057 0.0218 0.0003 213 65 143 5 139 2 02 155 197 5.66 0.78 0.0517 0.0031 0.1577 0.0092 0.0221 0.0003 274 107 149 8 141 2 03 280 561 15.4 0.50 0.0500 0.0015 0.1538 0.0043 0.0223 0.0002 193 45 145 4 142 2 04 391 852 22.5 0.46 0.0481 0.0012 0.1445 0.0035 0.0218 0.0002 106 39 137 3 139 1 05 60.1 196 5.19 0.31 0.0506 0.0027 0.1573 0.0081 0.0226 0.0003 221 93 148 7 144 2 06 324 635 17.1 0.51 0.0498 0.0015 0.1493 0.0042 0.0218 0.0002 184 46 141 4 139 1 07 138 386 10.3 0.36 0.0511 0.0017 0.1576 0.0052 0.0224 0.0003 244 55 149 5 143 2 08 156 295 8.09 0.53 0.0503 0.0023 0.1518 0.0067 0.0219 0.0003 211 79 143 6 140 2 09 132 270 7.25 0.49 0.0470 0.0024 0.1434 0.0070 0.0221 0.0003 49 81 136 6 141 2 10 249 403 11.1 0.62 0.0492 0.0020 0.1471 0.0059 0.0217 0.0003 156 70 139 5 138 2 11 191 388 10.4 0.49 0.0457 0.0019 0.1386 0.0057 0.0220 0.0003 -20 62 132 5 140 2 12 177 221 6.34 0.80 0.0463 0.0027 0.1379 0.0078 0.0216 0.0003 12 96 131 7 138 2 13 370 773 21.0 0.48 0.0494 0.0014 0.1499 0.0039 0.0220 0.0002 165 42 142 3 141 1 14 236 467 12.8 0.51 0.0509 0.0017 0.1544 0.0050 0.0220 0.0003 237 54 146 4 140 2 15 300 718 19.2 0.42 0.0513 0.0014 0.1564 0.0039 0.0221 0.0002 254 38 148 3 141 1 16 185 441 11.7 0.42 0.0496 0.0017 0.1498 0.0051 0.0219 0.0003 178 57 142 4 140 2 17 324 651 17.3 0.50 0.0489 0.0015 0.1470 0.0043 0.0218 0.0002 144 47 139 4 139 2 18 195 382 10.3 0.51 0.0491 0.0020 0.1484 0.0059 0.0219 0.0003 155 70 140 5 140 2 19 249 458 12.7 0.54 0.0512 0.0018 0.1550 0.0053 0.0220 0.0003 249 57 146 5 140 2 20 314 479 13.9 0.66 0.0518 0.0018 0.1593 0.0053 0.0223 0.0003 107 134 6 141 2 21 168 323 8.92 0.52 0.0475 0.0020 0.1449 0.0060 0.0222 0.0003 73 69 137 5 141 2 22 167 237 6.58 0.70 0.0510 0.0027 0.1532 0.0078 0.0218 0.0003 243 91 145 7 139 2 23 247 526 14.2 0.47 0.0470 0.0016 0.1433 0.0045 0.0221 0.0003 47 49 136 4 141 2 24 207 418 11.3 0.49 0.0506 0.0019 0.1520 0.0056 0.0218 0.0003 223 62 144 5 139 2 25 286 685 18.1 0.42 0.0492 0.0014 0.1485 0.0041 0.0219 0.0002 157 44 141 4 140 1 26 219 452 12.2 0.48 0.0481 0.0017 0.1454 0.0049 0.0219 0.0003 106 57 138 4 140 2 27 367 825 21.8 0.44 0.0485 0.0013 0.1459 0.0037 0.0218 0.0002 124 40 138 3 139 1 28 193 373 10.2 0.52 0.0493 0.0019 0.1485 0.0055 0.0219 0.0003 160 64 141 5 140 2 29 150 310 8.24 0.48 0.0501 0.0022 0.1501 0.0064 0.0218 0.0003 198 76 142 6 139 2 30 152 283 7.94 0.54 0.0526 0.0023 0.1614 0.0068 0.0223 0.0003 309 72 152 6 142 2 TP-29流纹岩 01 86.1 166 5.20 0.52 0.0489 0.0033 0.1439 0.0094 0.0214 0.0003 143 119 136 8 136 2 02 115 193 6.54 0.60 0.0528 0.0031 0.1614 0.0091 0.0222 0.0003 319 103 152 8 141 2 03 84.5 155 6.11 0.55 0.0852 0.0041 0.2678 0.0126 0.0228 0.0003 102 131 6 138 2 04 72.3 146 4.57 0.50 0.0555 0.0039 0.1621 0.0113 0.0212 0.0003 430 128 153 10 135 2 05 83.3 147 5.98 0.56 0.0894 0.0042 0.2889 0.0132 0.0234 0.0004 28 244 135 15 141 2 06 123 187 6.28 0.66 0.0424 0.0031 0.1262 0.0091 0.0216 0.0003 -153 131 121 8 138 2 07 126 219 7.15 0.58 0.0521 0.0027 0.1572 0.0079 0.0219 0.0003 290 90 148 7 140 2 08 125 200 6.42 0.62 0.0464 0.0030 0.1376 0.0086 0.0215 0.0003 18 109 131 8 137 2 09 81.6 156 4.97 0.52 0.0471 0.0034 0.1397 0.0100 0.0215 0.0003 52 128 133 9 137 2 10 558 732 23.5 0.76 0.0465 0.0013 0.1381 0.0037 0.0215 0.0002 25 38 131 3 137 1 11 388 623 19.5 0.62 0.0509 0.0015 0.1530 0.0043 0.0218 0.0002 234 44 145 4 139 2 12 151 232 7.60 0.65 0.0494 0.0026 0.1440 0.0074 0.0212 0.0003 166 94 137 7 135 2 13 158 248 8.19 0.64 0.0506 0.0026 0.1508 0.0077 0.0217 0.0003 220 93 143 7 138 2 14 216 278 9.21 0.78 0.0513 0.0024 0.1498 0.0067 0.0212 0.0003 253 80 142 6 135 2 15 189 349 10.9 0.54 0.0488 0.0019 0.1494 0.0058 0.0222 0.0003 137 67 141 5 142 2 16 171 248 8.80 0.69 0.0625 0.0027 0.1908 0.0079 0.0222 0.0003 189 131 10 138 2 17 141 207 6.89 0.68 0.0452 0.0028 0.1379 0.0084 0.0221 0.0003 -9 104 131 8 141 2 18 101 176 5.73 0.57 0.0488 0.0032 0.1482 0.0094 0.0220 0.0003 140 116 140 8 140 2 19 107 189 6.05 0.56 0.0453 0.0029 0.1351 0.0086 0.0217 0.0003 -5 110 129 8 138 2 20 175 194 7.11 0.91 0.0461 0.0029 0.1394 0.0086 0.0219 0.0003 5 105 133 8 140 2 21 87.7 164 6.04 0.53 0.0832 0.0040 0.2562 0.0118 0.0224 0.0003 285 281 145 17 137 2 22 232 429 13.7 0.54 0.0635 0.0020 0.1908 0.0057 0.0218 0.0003 135 177 137 10 137 2 23 75.0 142 5.39 0.53 0.0837 0.0044 0.2633 0.0134 0.0229 0.0004 246 284 146 18 140 2 24 107 188 6.24 0.57 0.0472 0.0030 0.1455 0.0090 0.0224 0.0003 61 109 138 8 142 2 25 110 169 5.73 0.65 0.0505 0.0033 0.1512 0.0098 0.0217 0.0003 218 119 143 9 139 2
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