GEOCHEMISTRY, CHRONOLOGY AND HF ISOTOPE FEATURES OF THE PERMAIN INTERMEDIATE-BASIC VOLCANIC ROCKS IN WULANAOBAO AREA, URAD HOUQI, INNER MONGOLIA AND ITS GEOLOGICAL SIGNIFICANCE
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摘要: 内蒙古乌拉特后旗乌兰敖包地区中-基性火山岩位于华北陆块北缘西段，野外出露岩性主要为灰黑色-深灰绿色玄武岩、深灰绿色玄武安山岩和灰绿色安山岩等。岩石样品中SiO2含量49.33~65.84%，Na2O含量0.53~5.49%，K2O平均值为0.25~6.40%，属于钙碱性系列；由基性到中性岩石中稀土总量呈增加趋势，轻稀土元素富集程度增加，δEu负异常逐渐明显；微量元素显示火山岩普遍具有不同程度的Ta、Nb亏损，U、Ba、K等大离子亲石元素富集特征，具有俯冲带弧岩浆岩的特征。火山岩中岩浆锆石U-Pb测年结果为285.0±2.3 Ma和265.0±1.5 Ma，表明其形成时代为早-中二叠世；火山岩与下伏地层接触关系及捕获锆石的年龄特征指示，乌兰敖包地区火山岩形成在华北陆块北缘之上。锆石Hf同位素信息指示岩浆起源于受俯冲板块影响的亏损地幔，岩浆上升过程中加入了壳源物质。Abstract: The Wulanaobao intermediate-basic volcanic rocks, distributed in Urad Houqi, Inner Mongolia, are located in the western north margin of the north China block. The outcropped lithologies mainly are grey black-spruce basalt, spruce basaltic andesite and greyish-green andesite. All samples show chemical signatures of calc-alkaline series which are characterized by contents of SiO2 (49.33~65.84%), Na2O (0.53~5.49%) and K2O (0.25~6.40%). From basic to intermediate, the amount of rare earth elements, light rare earth elements enrichment degree and Eu negative anomaly degree show a trend of increase. The trace elements show subduction zone arc magmatite features which are characterized by wide depletion of Ta and Nb, and enrichment of the large ion lithophile elements (U, Ba, K). The zircon U-Pb dating results of the magma from volcanic rocks are 285.0±2.3Ma and 265.0±1.5Ma, which indicates that the volcanic rocks were formed at the early-middle Permian period. The age characteristics of captured zircons and the contact relations between volcanic rocks and underlying strata suggest that volcanic rocks from Wulanaobao were formed on the crust of the north China block. Zircon Hf isotopic information indicates that the magma was derived from the depleted mantle which was affected by the subducting plate and partly joined with crust-derived material during the rising stage.
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图 1 乌兰敖包地区构造位置及区域地质略图[33]
Figure 1. Simplified geological map of tectonic location and regional geology in Wulanaobao area
图 2 早二叠世火山岩野外及镜下特征
a—气孔杏仁状玄武岩; b—火山角砾岩(玄武质角砾); c—玄武安山岩; d—玄武岩(单偏光), 气孔杏仁状构造, 少斑结构); e—玄武安山岩间隐结构(正交偏光); f—安山岩多斑结构(正交偏光)
Figure 2. Field and microscopic characteristics of the lower Permian volcanic rocks
图 3 乌兰敖包火山岩K2O+Na2O-SiO2图解(a)和K2O-SiO2图解(b)(底图据[34])
Figure 3. Diagrams of K2O+Na2O-SiO2 (a) and K2O-SiO2 (b) of the volcanic rocks in Wulanaobao area
图 4 乌兰敖包火山岩稀土元素及微量元素特征
Figure 4. Trace elements spiderdiagram (a-c) and rare earth distribution pattern (d-f) of the volcanic rocks in Wulanaobao area
图 6 乌兰敖包火山岩锆石U-Pb谐和图及加权平均年龄
Figure 6. Zircon U-Pb Concordia diagram and weighted average age of the volcanic rocks in Wulanaobao area
图 7 乌兰敖包火山岩岩浆锆Hf同位素组成(底图据[35])
Figure 7. Zircon Hf isotope composition of the volcanic magma in Wulanaobao area
图 8 乌兰敖包火山岩A(Al2O3)-T(TiO2×10)-K(K2O×10) 图解(底图据[44])
Figure 8. The A(Al2O3)-T(TiO2×10)-K(K2O×10) diagram of the volcanic rocks in Wulanaobao area
表 1 乌兰敖包火山岩主量元素、微量元素及稀土元素分析结果
Table 1. Analysis results of major elements, trace elements and rare earth elements of the volcanic rocks in Wulanaobao area
送样号 P4-33-1 P4-37-1 P4-40-1 P4-41-1 P4-64-1 P4-65-1 P5-1-1 P5-5-1 P5-26-1 P5-41-1 P7-11-1 P7-38-1 P7-40-1 样品名称 玄武岩 玄武岩 安山岩 玄武岩 安山岩 安山岩 玄武岩 玄武安山岩 安山岩 安山岩 安山岩 玄武安山岩 玄武安山岩 SiO2 47.90 49.88 58.41 49.52 58.92 60.16 50.13 52.32 58.69 64.08 56.43 54.28 54.82 TiO2 1.06 1.72 0.82 1.59 0.80 0.82 1.52 1.39 0.86 0.67 0.53 1.30 1.31 Al2O3 16.26 15.11 16.83 15.27 16.77 17.12 17.57 19.96 16.39 15.35 11.77 16.79 16.55 Fe2O3 4.01 5.71 2.41 7.91 2.32 4.83 3.20 4.88 2.75 2.32 2.62 3.39 4.43 FeO 5.52 5.55 3.34 2.30 2.98 0.68 5.36 2.37 2.97 1.77 0.89 3.51 2.65 MgO 7.95 5.92 4.38 4.32 3.24 2.09 7.38 4.53 4.52 2.54 6.69 5.69 5.66 MnO 0.16 0.15 0.09 0.14 0.08 0.06 0.14 0.10 0.11 0.08 0.07 0.08 0.10 CaO 11.21 9.56 4.23 11.98 8.03 7.97 8.28 6.87 5.39 3.67 11.02 7.08 8.51 Na2O 2.23 3.62 5.35 4.92 2.80 2.90 3.20 3.82 2.91 4.93 0.51 3.21 2.67 K2O 0.69 0.23 1.39 0.25 1.26 1.30 0.28 2.06 2.21 1.77 6.20 1.44 0.30 P2O5 0.12 0.22 0.26 0.22 0.19 0.19 0.20 0.13 0.20 0.15 0.09 0.42 0.41 LOI 2.09 1.52 1.91 1.13 2.1 1.62 1.95 1.09 2.47 2.28 2.91 2.24 2.14 Total 99.2 99.21 99.43 99.56 99.49 99.73 99.21 99.53 99.47 99.6 99.73 99.43 99.54 Cu 69.3 79.4 28.5 45.3 23.6 22.1 62.5 30.3 23.4 49.7 7.73 26.9 51.4 Pb 9.39 3.72 7.49 6.26 17.1 23.7 8.42 7.86 11.9 14.4 27.9 11.2 16.4 Zn 64 88.2 61.2 74.7 64.6 61.2 71.8 69.2 59.5 57 54.5 77.9 72.3 Cr 129 81.8 85.8 52.2 118 141 278 118 214 87.9 47.8 201 197 Ni 80.9 39.2 73.8 38 25.4 23.5 140 44.1 94 50.1 16.9 67.9 67.1 Co 46.8 42.8 19.9 41.1 18.8 17 41.2 24.7 22.2 14.3 7.18 23.4 23.2 Li 33.2 41.6 55 72.7 25.8 49.9 17.7 13.6 30 20.1 23.4 28.2 32.4 Rb 24 11.5 39.4 12.5 39.2 42.7 10.8 82.3 60.6 61.7 202 30.3 6.3 Cs 2.66 5.22 4.15 7.09 2.16 4.64 0.79 2.72 2.99 1.95 7.56 4.32 2.24 Sr 384 261 400 162 676 676 332 389 326 561 191 920 862 Ba 720 745 399 129 498 681 120 196 368 283 704 554 311 V 229 267 114 246 119 116 147 134 79.3 61.4 50.8 118 108 Sc 43 37.6 20.2 39.6 18 21.1 30 26.5 21.2 20.6 12.9 20.6 21.2 Nb 7.15 14.8 7.32 14.3 5.85 5.96 3.74 4.16 7.38 8.15 9.98 9.35 8.99 Ta 0.47 0.98 0.46 0.88 0.44 0.41 0.29 0.34 0.61 0.67 0.7 0.66 0.59 Zr 63.2 121 151 92.9 135 137 162 156 204 179 218 254 246 Hf 1.82 3.29 3.76 2.54 3.82 3.64 3.87 4.1 5 4.65 6.12 5.94 5.49 Ga 16.4 17.1 17.8 14.4 18.2 19.6 18.9 20.8 18.5 20.3 14.1 19.4 19.8 U 0.29 0.56 1.35 1.84 1.46 1.69 0.62 0.66 1.58 1.92 2.93 1.41 1.24 Th 0.87 1.82 3.8 1.59 5.54 5.52 1.61 1.92 5.79 7.21 9.01 5.46 5.01 La 7.71 14.4 22.9 12.3 22.2 23.1 11.1 10.3 21.3 29.1 33 27.8 27.5 Ce 17.2 31 48.3 26.6 46.4 48.4 28.7 25.4 46.4 61.2 67.7 61.2 60.4 Pr 2.36 4.1 5.57 3.44 5.59 5.65 4.1 3.77 5.59 7.47 8.4 7.76 7.62 Nd 10.7 18 21.5 14.8 21.6 21.7 18.5 17.4 22.2 27.9 31.9 31.8 31 Sm 2.92 4.49 3.86 3.56 4.15 4.15 4.68 4.49 4.75 4.76 5.94 6.41 6.09 Eu 1.15 1.55 1.07 1.12 1.12 1.18 1.46 1.44 1.33 1.18 1.06 1.78 1.71 Gd 3 4.56 3.31 3.46 3.58 3.67 4.29 4.21 4.33 3.74 5.33 5.58 5.3 Tb 0.6 0.91 0.51 0.68 0.58 0.55 0.85 0.84 0.75 0.51 0.87 0.91 0.87 Dy 3.78 5.5 2.63 4.35 3.02 2.96 5.15 5.14 4.34 2.43 5.06 4.96 4.79 Ho 0.76 1.1 0.49 0.88 0.57 0.56 1.01 1.02 0.84 0.45 1 0.95 0.9 Er 2.12 3.08 1.41 2.51 1.6 1.56 2.81 2.9 2.41 1.33 3.01 2.64 2.52 Tm 0.31 0.46 0.2 0.37 0.23 0.22 0.42 0.42 0.35 0.18 0.46 0.38 0.36 Yb 1.92 2.82 1.25 2.29 1.44 1.41 2.61 2.67 2.21 1.13 2.96 2.35 2.23 Lu 0.29 0.43 0.19 0.34 0.22 0.21 0.4 0.4 0.35 0.17 0.46 0.36 0.34 Y 20.6 28.9 14 23.5 15.4 15.9 29 27.2 24.6 12.8 30.9 25.2 25.5 
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表 2 乌兰敖包火山岩LA-MC-ICP-MS锆石U-Pb同位素分析数据
Table 2. LA-MC-ICP-MS zircon U-Pb isotopic analysis data of the volcanic rocks in Wulanaobao area
样品号 含量(×10-6) 同位素比值 年龄(Ma) Pb U 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ P5.48.1.1 5 91 0.0449 0.0005 0.3248 0.0173 0.0524 0.0028 283 3 286 15 304 120 P5.48.1.2 7 79 0.0753 0.0008 0.5862 0.0092 0.0565 0.0007 468 5 468 7 470 29 P5.48.1.3 25 575 0.0374 0.0004 0.3468 0.0045 0.0673 0.0008 237 2 302 4 846 23 P5.48.1.4 47 85 0.4566 0.0054 9.8848 0.1433 0.1570 0.0018 2424 29 2424 35 2424 19 P5.48.1.5 51 209 0.2304 0.0024 2.7059 0.0505 0.0852 0.0016 1337 14 1330 25 1319 36 P5.48.1.6 10 190 0.0452 0.0006 0.5302 0.0596 0.0850 0.0097 285 4 432 49 1315 221 P5.48.1.7 2 24 0.0745 0.0009 0.5860 0.0096 0.0570 0.0007 463 6 468 8 493 28 P5.48.1.8 22 301 0.0745 0.0007 0.6258 0.0086 0.0609 0.0007 463 5 493 7 635 26 P5.48.1.9 21 437 0.0451 0.0005 0.4123 0.0218 0.0663 0.0034 284 3 351 19 817 107 P5.48.1.10 6 110 0.0546 0.0006 0.4024 0.0072 0.0535 0.0009 342 3 343 6 350 37 P5.48.1.11 16 348 0.0456 0.0005 0.3264 0.0055 0.0519 0.0008 287 3 287 5 283 34 P5.48.1.12 20 314 0.0633 0.0007 0.4743 0.0079 0.0544 0.0008 395 4 394 7 386 35 P5.48.1.13 21 260 0.0744 0.0008 0.5765 0.0124 0.0562 0.0011 462 5 462 10 462 44 P5.48.1.14 10 215 0.0450 0.0005 0.3717 0.0068 0.0599 0.0010 284 3 321 6 602 36 P5.48.1.15 28 334 0.0746 0.0008 0.6395 0.0099 0.0622 0.0008 464 5 502 8 680 29 P5.48.1.16 33 736 0.0418 0.0004 0.4249 0.0058 0.0738 0.0009 264 3 360 5 1035 24 P5.48.1.17 11 222 0.0454 0.0005 0.3257 0.0116 0.0521 0.0018 286 3 286 10 288 79 P5.48.1.18 6 130 0.0399 0.0008 0.2851 0.0091 0.0518 0.0010 253 5 255 8 275 44 P5.48.1.19 18 150 0.0890 0.0009 5.4437 0.1236 0.4436 0.0097 550 6 1892 43 4064 33 P5.48.1.20 12 155 0.0744 0.0009 0.5824 0.0701 0.0568 0.0069 463 6 466 56 482 270 P5.48.1.21 3 53 0.0454 0.0005 0.3240 0.0055 0.0518 0.0008 286 3 285 5 277 35 P5.48.1.22 16 214 0.0745 0.0007 0.5782 0.0082 0.0563 0.0007 463 5 463 7 465 28 P5.48.1.23 24 286 0.0799 0.0009 0.6299 0.0354 0.0572 0.0031 495 5 496 28 500 120 P5.48.1.24 9 149 0.0596 0.0006 0.4439 0.0062 0.0540 0.0007 373 4 373 5 371 28 P7.38.1.1 28 435 0.0665 0.0006 0.5067 0.0048 0.0553 0.0004 415 4 416 4 423 17 P7.38.1.2 30 481 0.0663 0.0006 0.5033 0.0049 0.0551 0.0004 414 4 414 4 416 18 P7.38.1.3 30 482 0.0668 0.0006 0.5055 0.0070 0.0549 0.0007 417 4 415 6 408 29 P7.38.1.4 16 374 0.0416 0.0004 0.2952 0.0027 0.0514 0.0005 263 2 263 2 259 21 P7.38.1.5 26 386 0.0667 0.0005 0.5070 0.0250 0.0552 0.0027 416 3 416 21 418 109 P7.38.1.6 5 92 0.0423 0.0004 0.3842 0.0035 0.0659 0.0005 267 2 330 3 802 17 P7.38.1.7 23 371 0.0664 0.0005 0.5121 0.0073 0.0559 0.0008 415 3 420 6 448 30 P7.38.1.8 25 56 0.3991 0.0029 6.9921 0.0553 0.1271 0.0010 2165 15 2110 17 2058 14 P7.38.1.9 187 570 0.3341 0.0025 5.2104 0.0646 0.1131 0.0015 1858 14 1854 23 1850 24 P7.38.1.10 17 207 0.0737 0.0005 0.5721 0.0091 0.0563 0.0009 458 3 459 7 465 35 P7.38.1.11 14 181 0.0756 0.0005 0.5894 0.0129 0.0565 0.0012 470 3 470 10 473 48 P7.38.1.12 11 162 0.0666 0.0006 0.5008 0.0032 0.0545 0.0004 416 3 412 3 392 16 P7.38.1.13 35 566 0.0666 0.0005 0.5189 0.0048 0.0565 0.0005 416 3 424 4 472 18 P7.38.1.14 27 405 0.0665 0.0006 0.5025 0.0038 0.0548 0.0004 415 4 413 3 406 16 P7.38.1.15 38 610 0.0662 0.0005 0.5038 0.0046 0.0552 0.0004 414 3 414 4 419 15 P7.38.1.16 70 1739 0.0416 0.0004 0.3040 0.0021 0.0529 0.0004 263 3 270 2 326 17 P7.38.1.17 2 50 0.0424 0.0004 0.3035 0.0018 0.0520 0.0003 268 3 269 2 283 14 P7.38.1.18 55 897 0.0664 0.0005 0.5107 0.0088 0.0558 0.0010 414 3 419 7 444 40 P7.38.1.19 11 293 0.0416 0.0003 0.3012 0.0061 0.0525 0.0011 263 2 267 5 306 46 P7.38.1.20 10 230 0.0419 0.0003 0.3075 0.0031 0.0533 0.0006 264 2 272 3 340 25 P7.38.1.21 38 597 0.0666 0.0005 0.5082 0.0253 0.0554 0.0024 416 3 417 21 427 97 P7.38.1.22 15 343 0.0425 0.0005 0.3996 0.0164 0.0682 0.0028 268 3 341 14 873 85 P7.38.1.23 8 276 0.0245 0.0002 0.1704 0.0050 0.0504 0.0015 156 1 160 5 214 68 P7.38.1.24 22 294 0.0665 0.0005 0.5050 0.0034 0.0550 0.0004 415 3 415 3 414 15 P7.38.1.25 6 99 0.0664 0.0005 0.5047 0.0051 0.0551 0.0005 414 3 415 4 417 22 P7.38.1.26 24 611 0.0421 0.0003 0.3240 0.0020 0.0559 0.0003 266 2 285 2 447 14 P7.38.1.27 43 198 0.2064 0.0015 2.5681 0.0240 0.0902 0.0009 1210 9 1292 12 1430 19 P7.38.1.28 29 188 0.1318 0.0009 1.2810 0.0337 0.0705 0.0018 798 6 837 22 943 53 P7.38.1.29 21 656 0.0323 0.0002 0.2353 0.0024 0.0528 0.0005 205 1 215 2 319 23 P7.38.1.30 26 395 0.0662 0.0005 0.5128 0.0038 0.0562 0.0004 413 3 420 3 460 16 P7.38.1.31 31 501 0.0666 0.0005 0.5143 0.0034 0.0560 0.0004 416 3 421 3 453 16 P7.38.1.32 45 1054 0.0419 0.0003 0.3193 0.0074 0.0552 0.0013 265 2 281 7 422 52 P7.38.1.33 17 372 0.0475 0.0004 0.3715 0.0098 0.0567 0.0009 299 2 321 8 480 35 P7.38.1.34 22 323 0.0667 0.0012 0.5026 0.0097 0.0547 0.0010 416 8 413 8 399 42 P7.38.1.35 11 165 0.0672 0.0006 0.5067 0.0037 0.0546 0.0004 420 3 416 3 398 16
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表 3 乌兰敖包火山岩LA-MC-ICP-MS锆石Hf同位素分析数据
Table 3. LA-MC-ICP-MS zircon Hf isotope analysis data of the volcanic rocks in Wulanaobao area
分析号 t(Ma) 176Lu/177Hf 176Yb/177Hf 176Hf/177Hf 176Hf/177Hf(i) 2s εHf(0) εHf(t) tDM1 tDM2 fLu/Hf P7.38.1.1 265 0.0006 0.0173 0.282421 0.282389 0.000015 -12.4 -6.7 1164 1710 -0.98 P7.38.1.2 265 0.0012 0.0385 0.282713 0.282652 0.000019 -2.1 3.5 769 1062 -0.96 P7.38.1.3 265 0.0011 0.0326 0.282446 0.282391 0.000015 -11.5 -5.9 1143 1659 -0.97 P7.38.1.4 265 0.0013 0.0378 0.282680 0.282612 0.000023 -3.3 2.3 818 1138 -0.96 P7.38.1.5 265 0.0006 0.0130 0.282426 0.282397 0.000020 -12.2 -6.5 1155 1697 -0.98 P7.38.1.6 265 0.0012 0.0330 0.282481 0.282421 0.000015 -10.3 -4.7 1097 1582 -0.96 P7.38.1.13 265 0.0015 0.0415 0.282686 0.282609 0.000019 -3.1 2.5 814 1127 -0.95 P7.38.1.14 265 0.0016 0.0469 0.282703 0.282621 0.000022 -2.4 3.1 791 1088 -0.95 P5.48.2 285 0.0015 0.0443 0.282420 0.282339 0.000015 -12.5 -6.5 1192 1710 -0.96 P5.48.4 285 0.0004 0.0145 0.282505 0.282481 0.000014 -9.4 -3.2 1042 1506 -0.99 P5.48.7 285 0.0007 0.0185 0.282914 0.282876 0.000028 5.0 11.1 476 591 -0.98
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