Geochemical characteristics, zircon U-Pb ages and geological implications of the eastern Innermongolia in Yanggeliya Mountain intermediate-acid rock
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摘要:
内蒙古东部央格力雅山岩体岩性为正长花岗岩、二长花岗岩和英云闪长岩。正长花岗岩U-Pb年龄为130.4±1.1Ma，英云闪长岩U-Pb年龄为126.6±3.0Ma、二长花岗岩锆石U-Pb年龄分别为131.6±1.1Ma和130.7±1.5Ma，显示岩体侵位时间为早白垩世。地球化学研究表明，该花岗岩体具有富硅、富碱、贫钙的特征，属准铝质-过铝质高钾钙碱性系列岩石；稀土元素总量较低、轻重稀土元素分馏明显，(La/Nb)N值在9.14~24.86之间、正Eu异常显著（δEu值为1.03~1.53）；微量元素K、La、Sr、Gd等明显富集，Nb、Pr、P、Ti等亏损；大离子亲石元素相对高场强元素富集。岩石分异指数平均为80.63，岩石成因类型属高分异I型花岗岩，岩浆来源于下地壳岩石的部分熔融，形成于伸展环境，与古太平洋板块俯冲作用密切相关。
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关键词:
- 中酸性岩体 /
- 地球化学特征 /
- LA-ICP-MS锆石U-Pb年龄 /
- 岩石成因 /
- 央格力雅山
Abstract:The Yanggeliya Mountain is located in the Oroqen Autonomous Banner, Hulunbuir City, eastern Inner Mongolia. Syenogranite, monzoniticgranite and tonalite are the main rocks, and the LA-ICP-MS zircon U-Pb age indicates that the emplacement time is Early Cretaceous (130.4 ±1.1Ma) for syenogranite, 126.6 ±3.0Ma for monzoniticgranite, 131.6 ±1.1Ma and 130.7±1.5Ma for tonalite. The study of rock geochemistry shows that the granite body is characterized by rich silicon and alkali, and depletion of calcium, belonging to the quasi-aluminum-peraluminous, high-potassic, calcium-alkali series of rocks. The total amount of rare earths is relatively low, the fractionation between LREE and HREE is obvious, and the (La/Nb)N values are between 9.14 and 24.86. The Eu has obvious positive anomalies (the δEu values are in the range of 1.03~1.53). As for trace elements, the values of K, La, Sr and Gd are obviously enriched, whereas Nb, Pr, P and Ti are depleted. Large ionic lithophile elements are enriched with relatively high field strength elements. The rock differentiation index DI averages 80.63. The above characteristics are similar to those of highly differentiated I-type granites. The source of magma was the crust-derived magma series, which was the product of the partial melting of continental crust rock, and the tectonic setting was a stretching environment which was closely related to subduction of ancient Pacific plate.
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表 1 央格力雅山中酸性岩全岩主量、微量和稀土元素测试结果
Table 1. Whole-rock major, trace and rare earth elements data of Yanggeliya Mountain intermediate-acid rocks
样品编号 TW2 TW3 TW4 TW6 样品编号 TW2 TW3 TW4 TW6 岩性 正长花岗岩 英云闪长岩 二长花岗岩 二长花岗岩 岩性 正长花岗岩 英云闪长岩 二长花岗岩 二长花岗岩 SiO2 73.8 60.2 74.4 69.1 Gd 1.34 3.87 0.8 3.09 TiO2 0.18 0.65 0.12 0.4 Tb 0.18 0.61 0.11 0.42 Al2O3 13.8 16.9 14.2 15.7 Dy 0.92 3.45 0.55 2.13 Fe2O3 1.99 5.86 1.83 3.29 Ho 0.15 0.64 0.09 0.32 FeO 0.25 1.83 0.18 0.93 Er 0.5 1.94 0.29 1.02 MnO 0.03 0.12 0.03 0.05 Tm 0.07 0.29 0.04 0.13 MgO 0.28 1.88 0.16 0.68 Yb 0.54 2 0.32 0.88 CaO 1.17 4.3 1.56 2.18 Lu 0.09 0.33 0.05 0.14 Na2O 3.76 4.26 4.24 4.62 ΣREE 62.2 133 37.2 134 K2O 4.19 2.34 3.28 3.02 LREE 58.4 120.5 34.9 126.4 P2O5 0.04 0.26 0.02 0.13 HREE 3.79 13.1 2.25 8.14 烧失量 0.18 2.24 0.02 0.21 LREE/HREE 15.4 9.18 15.5 15.5 总计 99.6 100 100 100 (La/Yb)N 18.8 9.41 21.6 24.7 Mg# 19.7 32.1 13.5 23.8 δEu 1.53 1.03 1.61 1.19 R1 2536 1737 2627 2137 δCe 1.05 1.01 0.92 1 R2 408 884 454 574 Rb 125 57 110 79.1 A/NK 1.28 1.77 1.35 1.44 Ba 593 889 558 1083 A/CNK 1.07 0.97 1.06 1.05 K 33720 20359 28901 25467 AR -1.41 -7 -1.58 -2.02 Th 10.9 4.76 7.66 9.29 DI 89.5 63.7 88.2 81.1 U 4.1 1.04 1.23 1.18 TFeO 2.05 7.2 1.83 3.89 Nb 4.37 9.9 4.14 8.43 TFe2O3 2.28 8 2.03 4.32 Sr 387 500 552 500 La 14.2 26.2 9.7 30.2 Ta 0.34 0.55 0.32 0.6 Ce 28.7 55.7 16.4 59.9 p 207 839 119 598 Pr 2.89 6.64 1.66 6.56 Ti 1037 4999 845 2586 Nd 10.1 25.7 5.81 24.3 Rb/Sr 0.32 0.11 0.2 0.16 Sm 1.66 4.8 0.94 4.01 Rb/Nb 28.7 5.76 26.6 9.38 Eu 0.77 1.51 0.47 1.42 La/Nb 3.24 2.65 2.33 3.58 注：分异指数(DI) =Qz+Or+Ab+Ne+Lc+Kp；固结指数(SI)=MgO×100/(MgO+FeO+F2O3+Na2O+K2O)；碱度率(AR) =[Al2O3+ CaO+(Na2O+K2O)]/[Al2O3+CaO-(Na2O+K2O)]；R1=4Si-11(Na+K)-2(Fe+Ti)；R2=6Ca+2Mg+Al; 镁指数(Mg#)=100×(MgO/ 40.3044)/(MgO/40.3044+FeOT/71.844);A/NK=Al2O3/(Na2O+K2O), A/CNK=Al2O3/(CaO+Na2O+K2O) 
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表 2 央格力雅山中酸性岩锆石U-Th-Pb同位素数据
Table 2. Zircon U-Th-Pb isotope data of the Yanggeliya Mountain intermediate-acid rocks
测点号 含量/10-6 Th/U 同位素比值 年龄/Ma Pb Th U 207Pb/206Pb 1σ/10-2 207Pb/235U 1σ/10-2 206Pb/238U 1σ/10-2 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ TW2-1 10.53 220 402 0.55 0.0513 0.20 0.1462 0.56 0.0207 0.03 254 91 139 5 132 2 TW2-2 16.52 480 578 0.83 0.0469 0.16 0.1345 0.45 0.0209 0.03 42 82 128 4 133 2 TW2-3 15.12 480 558 0.86 0.0526 0.19 0.1437 0.45 0.0202 0.03 309 77 136 4 129 2 TW2-4 12.04 287 468 0.61 0.0485 0.18 0.1346 0.51 0.0202 0.03 124 89 128 5 129 2 TW2-5 18.14 563 673 0.84 0.0523 0.19 0.1413 0.52 0.0197 0.03 300 81 134 5 125 2 TW2-6 7.07 135 284 0.47 0.0537 0.35 0.1486 0.93 0.0202 0.05 367 146 141 8 129 3 TW2-7 25.11 789 945 0.83 0.0501 0.17 0.1397 0.49 0.0203 0.03 211 78 133 4 129 2 TW2-8 21.43 626 804 0.78 0.0511 0.18 0.1434 0.56 0.0203 0.03 256 83 136 5 129 2 TW2-9 15.15 375 567 0.66 0.0492 0.18 0.1416 0.53 0.0208 0.03 167 85 134 5 133 2 TW2-10 13.88 402 545 0.74 0.0521 0.22 0.1407 0.57 0.0200 0.03 298 98 134 5 128 2 TW2-11 14.14 265 575 0.46 0.0495 0.20 0.1386 0.55 0.0205 0.03 169 94 132 5 131 2 TW2-12 10.87 233 450 0.52 0.0466 0.19 0.1293 0.56 0.0202 0.04 32 96 123 5 129 2 TW2-13 18.00 477 656 0.73 0.0521 0.18 0.1514 0.51 0.0212 0.03 300 80 143 4 135 2 TW2-14 8.46 202 331 0.61 0.0482 0.23 0.1345 0.65 0.0204 0.04 109 107 128 6 130 2 TW2-15 9.47 185 385 0.48 0.0522 0.25 0.1459 0.66 0.0206 0.03 295 139 138 6 132 2 TW2-16 19.70 563 747 0.75 0.0519 0.19 0.1491 0.56 0.0209 0.03 280 83 141 5 133 2 TW2-17 12.43 386 492 0.78 0.0533 0.23 0.1448 0.65 0.0197 0.03 339 98 137 6 126 2 TW2-18 14.03 360 552 0.65 0.0502 0.19 0.1419 0.54 0.0205 0.03 206 92 135 5 131 2 TW2-19 12.04 266 470 0.57 0.0527 0.21 0.1509 0.58 0.0210 0.03 322 93 143 5 134 2 TW2-20 13.40 381 525 0.73 0.0504 0.19 0.1365 0.49 0.0199 0.03 213 85 130 4 127 2 TW2-21 10.46 236 414 0.57 0.0482 0.19 0.1367 0.56 0.0206 0.03 109 99 130 5 132 2 TW2-22 14.03 402 538 0.75 0.0486 0.18 0.1343 0.50 0.0201 0.03 128 89 128 4 128 2 TW2-23 14.35 330 547 0.60 0.0482 0.19 0.1373 0.51 0.0208 0.03 106 94 131 5 133 2 TW2-24 14.09 337 539 0.63 0.0499 0.19 0.1407 0.55 0.0203 0.03 191 89 134 5 129 2 TW2-25 14.86 349 582 0.60 0.0479 0.19 0.1340 0.51 0.0202 0.03 95 89 128 5 129 2 TW3-1 2.49 64.5 103 0.62 0.0549 0.32 0.1420 0.79 0.0195 0.04 406 130 135 7 124 3 TW3-2 4.48 200 159 1.26 0.0467 0.29 0.1197 0.68 0.0189 0.04 35 141 115 6 121 2 TW3-4 1.98 49.6 84.8 0.59 0.0518 0.44 0.1307 0.0104 0.0190 0.05 276 192 125 9 121 3 TW3-6 2.64 72.6 99.9 0.73 0.0518 0.45 0.1378 0.98 0.0207 0.07 276 198 131 9 132 4 TW3-8 6.01 231 235 0.98 0.0466 0.24 0.1229 0.65 0.0195 0.04 27.9 119 118 6 125 3 TW3-9 5.41 97.9 226 0.43 0.0473 0.27 0.1345 0.82 0.0208 0.04 65 130 128 7 132 2 TW3-10 8.67 294 333 0.88 0.0493 0.24 0.1321 0.66 0.0198 0.04 161 117 126 6 127 2 TW3-14 8.18 169 329 0.51 0.0529 0.21 0.1411 0.52 0.0198 0.03 328 91 134 5 127 2 TW3-19 14.42 372 540 0.69 0.0505 0.16 0.1406 0.43 0.0203 0.03 217 79 134 4 130 2 TW4-1 9.16 187 361 0.52 0.0482 0.20 0.1362 0.54 0.0206 0.03 109 101 130 5 131 2 TW4-2 13.74 306 530 0.58 0.0483 0.15 0.1381 0.43 0.0208 0.03 122 76 131 4 133 2 TW4-3 18.59 571 714 0.80 0.0548 0.17 0.1508 0.51 0.0200 0.03 467 70 143 5 127 2 TW4-5 16.43 448 642 0.70 0.0463 0.15 0.1298 0.41 0.0204 0.03 13 74 124 4 130 2 TW4-6 11.84 256 471 0.54 0.0487 0.16 0.1366 0.43 0.0204 0.03 200 76 130 4 130 2 TW4-7 7.48 139 299 0.47 0.0486 0.19 0.1380 0.51 0.0208 0.03 132 91 131 5 133 2 TW4-8 14.15 416 545 0.76 0.0481 0.17 0.1331 0.49 0.0201 0.03 102 85 127 4 128 2 TW4-9 23.12 653 848 0.77 0.0469 0.13 0.1346 0.37 0.0207 0.02 42.7 63 128 3 132 2 TW4-10 16.78 395 652 0.60 0.0484 0.15 0.1391 0.45 0.0208 0.03 120 69 132 4 133 2 TW4-11 18.62 514 735 0.70 0.0472 0.16 0.1352 0.50 0.0207 0.03 58 143 129 4 132 2 TW4-12 13.50 357 527 0.68 0.0503 0.16 0.1387 0.45 0.0201 0.03 209 76 132 4 128 2 TW4-13 13.28 346 524 0.66 0.0468 0.18 0.1307 0.53 0.0202 0.03 39 93 125 5 129 2 TW4-14 8.44 189 321 0.59 0.0508 0.21 0.1455 0.61 0.0207 0.03 232 96 138 5 132 2 TW4-15 12.74 320 498 0.64 0.0516 0.19 0.1414 0.48 0.0019 0.03 265 79 134 4 128 2 TW4-16 16.89 482 634 0.76 0.0481 0.14 0.1352 0.40 0.0014 0.03 106 72 129 4 131 2 TW4-18 14.20 315 560 0.56 0.0460 0.16 0.1300 0.45 0.0016 0.03 - - 124 4 131 2 TW4-19 8.50 183 336 0.55 0.0496 0.18 0.1400 0.53 0.0018 0.03 176 87 133 5 131 2 TW4-20 18.25 438 692 0.63 0.0522 0.16 0.1514 0.48 0.0016 0.03 295 72 143 4 134 2 TW4-21 13.81 291 546 0.53 0.0458 0.16 0.1319 0.45 0.0016 0.03 - - 126 4 134 2 TW4-22 20.99 610 751 0.81 0.0489 0.14 0.1454 0.42 0.0014 0.03 143 69 138 4 138 2 TW4-23 11.34 250 434 0.58 0.0514 0.20 0.1512 0.62 0.0020 0.03 261 91 143 5 136 2 TW4-24 16.46 393 624 0.63 0.0518 0.19 0.1507 0.58 0.0019 0.03 280 85 143 5 134 2 TW4-25 15.07 310 593 0.52 0.0467 0.15 0.1369 0.45 0.0015 0.03 35 74 130 4 135 2 TW6-1 9.21 137 264 0.52 0.0554 0.42 0.1623 0.0125 0.0042 0.06 428 168 153 11 137 4 TW6-2 13.3 246 343 0.72 0.0502 0.27 0.1368 0.74 0.0027 0.04 206 126 130 7 127 2 TW6-3 14.3 257 414 0.62 0.0501 0.25 0.1405 0.71 0.0025 0.04 211 119 134 6 129 2 TW6-4 26.7 629 537 1.17 0.0528 0.23 0.1443 0.62 0.0023 0.03 317 98 137 6 127 2 TW6-5 19.9 399 481 0.83 0.0471 0.24 0.1306 0.65 0.0024 0.04 54 114 125 6 128 2 TW6-6 34.2 702 835 0.84 0.0497 0.17 0.1384 0.47 0.0017 0.03 183 80 132 4 128 2 TW6-7 17.9 330 496 0.67 0.0471 0.25 0.1312 0.68 0.0025 0.04 54 118 125 6 129 2 TW6-8 20.7 435 476 0.91 0.0473 0.25 0.1288 0.64 0.0025 0.04 64.9 122 123 6 130 3 TW6-9 15.3 267 419 0.64 0.0478 0.25 0.1328 0.67 0.0025 0.04 87 119 127 6 131 3 TW6-11 16.2 319 438 0.73 0.0478 0.24 0.1293 0.65 0.0024 0.04 100 109 123 6 125 2 TW6-12 12.6 246 321 0.77 0.0515 0.28 0.1470 0.81 0.0028 0.04 261 94 139 7 131 2 TW6-13 14.7 240 393 0.61 0.0476 0.21 0.1397 0.60 0.0021 0.04 80 109 133 5 136 2 TW6-14 13.6 223 368 0.61 0.0504 0.25 0.1494 0.75 0.0025 0.04 213 114 141 7 138 3 TW6-15 13.5 255 368 0.69 0.0495 0.30 0.1412 0.77 0.0030 0.04 169 143 134 7 135 3 TW6-16 15.6 277 405 0.68 0.0477 0.22 0.1395 0.65 0.0022 0.03 87 107 133 6 134 2 TW6-17 22.6 480 522 0.92 0.0488 0.21 0.1417 0.62 0.0211 0.04 200 102 135 5 134 3 TW6-18 11.9 199 335 0.59 0.0498 0.29 0.1361 0.77 0.0201 0.04 187 137 130 7 128 3 TW6-19 21.0 468 497 0.94 0.0487 0.23 0.1406 0.69 0.0208 0.04 132 111 134 6 132 3 TW6-20 21.1 430 517 0.83 0.0547 0.30 0.1462 0.73 0.0198 0.04 398 94 139 6 126 2 TW6-21 12.0 209 336 0.62 0.0509 0.27 0.1463 0.77 0.0210 0.04 235 124 139 7 134 3 TW6-22 16.8 336 462 0.73 0.0499 0.24 0.1352 0.62 0.0200 0.04 191 111 129 6 128 3 TW6-23 29.0 646 614 1.05 0.0474 0.20 0.1352 0.54 0.0208 0.04 78 87 129 5 132 2 TW6-24 12.7 214 361 0.59 0.0486 0.26 0.1394 0.76 0.0209 0.04 128 122 132 7 133 3 TW6-25 19.7 372 492 0.76 0.0507 0.30 0.1409 0.76 0.0204 0.04 228 140 134 7 130 2
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