Chronology of the Haobiru Formation in the Haobiru area of northern Alxa, Inner Mongolia and its geological implications
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摘要:
内蒙古阿拉善北部好比如地区地层研究程度较低，好比如组时代久有争议，制约了该区地层层序、沉积建造及构造演化的深入研究。测得好比如地区原定为早石炭世的好比如组碎屑岩LA-ICP-MS锆石U-Pb最小峰值年龄为279Ma，火山岩LA-ICP-MS锆石U-Pb年龄为270.3±2.2Ma，时代应修订为早二叠世空谷期—中二叠世罗德期。结合区域上岩性特征、地层对比及锆石年龄谱对比，将好比如组中段修订为船山统隆林阶—罗甸阶埋汗哈达组（P1-2m），将其上段修订为阳新统祥播阶—冷坞阶阿其德组（P2a）。好比如组的时代修订为研究区晚古生代地层层序、沉积建造及构造演化的研究提供了新的依据。
Abstract:Due to the low level of stratigraphic study of the Haobiru area in northern Alxa, Inner Mongolia, the age of the Haobiru Formation is controversial, and this limits the further discussion on the sequence stratigraphy, sedimentary construction and tectonic evolution.The authors revealed that the LA-ICP-MS zircon U-Pb age of the Early Carboniferous Haobiru Formation from the Haobiru area is 270.3±2.2Ma, and the youngest peak age of detrital zircons is 279Ma, and hence the age should be reassigned to Early Permian Kungurian-Middle Permian Roadian. According to the regional lithological characteristics, stratigraphic contrast and comparison of zircon age spectra, the Haobiru Formation should be reassigned to Lower-Middle Permian Maihanhada Formation(P1-2m)-Middle Permian Aqide Formation(P2a). The age revision of the Haobiru Formation provides new evidence for the discussion on the Late Paleozoic sequence stratigraphy, sedimentary construction and tectonic evolution.
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致谢: 中国地质调查局西安地质调查中心卢进才教授级高工审阅全文，并给予修改意见，许伟、余龙工程师在论文撰写过程中给予了帮助，韩小锋、王宝文等工程师参与了野外工作，一并谨此致谢。
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图 1 阿拉善北部好比如地区地质简图（据参考文献[21]修改）
Q—第四系；E—新近系；K—白垩系；J—侏罗系；T—三叠系；P3h—上二叠统哈尔苏海组；P2a—中二叠统阿其德组；P1-2m—下—中二叠统埋汗哈达组；C2P1a—石炭系-二叠系阿木山组；D—泥盆系；S—志留系；O—奥陶系；∈—寒武系；Jx—元古宇蓟县群；ChG—元古宇古硐井群；γ—岩体
Figure 1. Geological sketch map of the Haobiru area, northern Alxa
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图 2 阿拉善北部好比如地区好比如组实测剖面
Figure 2. Measured geological section of the"Haobiru Formation" in the Haobiru area, northern Alxa
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图版Ⅰ
a.含方解石-石英细脉含炭绢云母硅质板岩；b.硅化微晶-细晶灰岩；c.中粗粒岩屑长石石英杂砂岩，对应同位素年龄样品15HBS-TW1；d.片理化安山质晶屑凝灰熔岩，对应同位素年龄样品15HBS-TW2；e.绿泥-碳酸盐化含气孔杏仁状铁质安山岩；f.复成分（底）砾岩。Cal—方解石；Pl—斜长石；Qtz—石英；Ser—绢云母
图版Ⅰ.
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图 3 阿拉善北部好比如地区晚古生代碎屑岩和火山岩部分锆石阴极发光图像、LA-ICP-MS测点位置及206Pb/238U年龄
Figure 3. CL images, dating spots and 206Pb/238U ages of some zircons from the Late Paleozoic clastic and volcanic rocks in the Haobiru area, northern Alxa
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图 4 阿拉善北部好比如地区晚古生代碎屑岩LA-ICP-MS锆石U-Pb谐和图（a）和年龄谱（b）
Figure 4. Diagrams of LA-ICP-MS zircon U-Pb concordia(a)and age spectra(b)of samples from the Late Paleozoic clastic rocks in the Haobiru area, northern Alxa
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图 5 阿拉善北部好比如地区晚古生代火山岩LA-ICP-MS锆石U-Pb谐和图（a）和206Pb/238U年龄图（b）
Figure 5. Diagrams of LA-ICP-MS zircon U-Pb concordia(a)and 206Pb/238U weight average(b) of samples from Late Paleozoic volcanic rocks in the Haobiru area, northern Alxa
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图 6 阿拉善北部埋汗哈达组（a）与双堡塘组（b）碎屑锆石年龄谱对比（PM067-8-RZ1数据据参考文献[5]）
Figure 6. Age spectra of the detrital zircons of Maihanhada Formation(a)and Shuangbaotang Formation(b)in northern Alxa
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图 7 银额盆地及其邻区石炭纪—二叠纪岩石地层单元划分
（据参考文献[26]修改）
Figure 7. Lithostratigraphic classification of Carboniferous— Permian strata in Yingen-Ejin basin and its vicinity
表 1 阿拉善北部好比如地区晚古生代碎屑岩和火山岩LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 1 LA-ICP-MS zircon U-Th-Pb data of Late Paleozoic clastic and volcanic rocks in the Haobiru area, northern Alxa
分析点 含量/10-6 232Th/238U 同位素比值 年龄/Ma 206Pb 232Th 238U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 15HBS-TW1 01 24 78 115 0.68 0.0503 0.0048 0.3293 0.0306 0.0475 0.0010 209 170 289 23 299 6 02 23 76 106 0.72 0.0523 0.0042 0.3615 0.0283 0.0501 0.0009 299 144 313 21 315 6 03 70 151 323 0.47 0.0511 0.0022 0.3474 0.0149 0.0493 0.0007 245 73 303 11 310 4 04 26 43 110 0.39 0.0574 0.0051 0.4330 0.0377 0.0547 0.0012 508 154 365 27 343 7 05 12 30 62 0.49 0.0523 0.0062 0.3292 0.0384 0.0456 0.0011 300 217 289 29 288 7 06 38 132 122 1.08 0.0537 0.0032 0.5274 0.0304 0.0713 0.0012 357 100 430 20 444 7 07 321 54 472 0.11 0.0685 0.0013 1.4622 0.0267 0.1548 0.0017 885 20 915 11 928 10 08 103 355 527 0.67 0.0519 0.0018 0.3189 0.0108 0.0446 0.0006 281 54 281 8 281 3 09 13 23 60 0.39 0.0534 0.0057 0.3766 0.0395 0.0512 0.0012 345 195 325 29 322 7 10 303 135 448 0.30 0.0680 0.0015 1.4437 0.0306 0.1539 0.0018 869 25 907 13 923 10 11 126 310 407 0.76 0.0543 0.0017 0.5292 0.0160 0.0706 0.0009 385 46 431 11 440 5 12 28 81 129 0.63 0.0557 0.0039 0.3846 0.0264 0.0501 0.0009 442 121 330 19 315 6 13 17 61 76 0.80 0.0540 0.0054 0.3685 0.0366 0.0495 0.0011 370 185 319 27 312 7 14 135 667 610 1.09 0.0526 0.0017 0.3650 0.0113 0.0503 0.0006 312 48 316 8 316 4 15 175 270 879 0.31 0.0541 0.0020 0.3380 0.0121 0.0453 0.0006 374 57 296 9 286 4 16 208 113 301 0.37 0.0692 0.0017 1.4956 0.0357 0.1568 0.0019 904 30 929 15 939 10 17 16 32 81 0.40 0.0512 0.0053 0.3255 0.0329 0.0462 0.0010 248 188 286 25 291 6 18 21 49 95 0.51 0.0517 0.0044 0.3614 0.0303 0.0507 0.0010 270 154 313 23 319 6 19 36 39 163 0.24 0.0528 0.0033 0.3692 0.0225 0.0507 0.0008 322 109 319 17 319 5 20 176 369 586 0.63 0.0557 0.0016 0.5255 0.0151 0.0684 0.0008 442 42 429 10 426 5 21 115 173 329 0.52 0.0568 0.0019 0.6241 0.0202 0.0796 0.0010 485 49 492 13 494 6 22 52 110 271 0.41 0.0501 0.0029 0.2996 0.0170 0.0434 0.0007 200 102 266 13 274 4 23 45 92 207 0.44 0.0516 0.0029 0.3526 0.0195 0.0496 0.0008 269 98 307 15 312 5 24 29 43 89 0.49 0.0544 0.0044 0.5479 0.0432 0.0731 0.0014 386 143 444 28 455 9 25 18 54 91 0.59 0.0536 0.0057 0.3345 0.0351 0.0453 0.0010 353 195 293 27 286 6 26 60 172 175 0.98 0.0561 0.0029 0.6060 0.0302 0.0784 0.0012 456 84 481 19 486 7 27 51 72 157 0.46 0.0551 0.0030 0.5640 0.0298 0.0743 0.0012 416 90 454 19 462 7 28 27 84 120 0.70 0.0568 0.0054 0.4009 0.0372 0.0512 0.0012 485 166 342 27 322 7 29 29 124 137 0.91 0.0508 0.0047 0.3324 0.0303 0.0475 0.0009 232 169 291 23 299 6 30 39 76 179 0.42 0.0515 0.0034 0.3506 0.0230 0.0494 0.0008 263 120 305 17 311 5 31 147 590 683 0.86 0.0534 0.0018 0.3592 0.0119 0.0488 0.0006 346 52 312 9 307 4 32 13 26 57 0.46 0.0542 0.0105 0.3929 0.0749 0.0526 0.0020 379 338 336 55 330 12 33 13 39 61 0.64 0.0512 0.0073 0.3494 0.0491 0.0495 0.0013 249 266 304 37 312 8 34 371 152 542 0.28 0.0713 0.0019 1.5312 0.0405 0.1558 0.0019 966 34 943 16 933 11 35 41 187 191 0.98 0.0512 0.0034 0.3465 0.0223 0.0491 0.0008 251 117 302 17 309 5 36 119 504 619 0.81 0.0525 0.0029 0.3175 0.0169 0.0439 0.0007 308 93 280 13 277 4 37 13 52 64 0.81 0.0536 0.0074 0.3298 0.0448 0.0447 0.0012 353 257 289 34 282 7 38 30 59 150 0.39 0.0507 0.0043 0.3203 0.0268 0.0458 0.0009 229 154 282 21 289 5 39 28 39 81 0.49 0.0519 0.0055 0.5651 0.0589 0.0791 0.0019 280 190 455 38 490 11 40 53 71 276 0.26 0.0503 0.0032 0.3039 0.0191 0.0439 0.0007 208 114 269 15 277 4 41 83 335 353 0.95 0.0535 0.0024 0.3952 0.0172 0.0536 0.0007 350 73 338 12 337 5 42 55 111 169 0.66 0.0559 0.0032 0.5676 0.0317 0.0737 0.0012 449 95 456 21 458 7 43 32 79 158 0.50 0.0555 0.0049 0.3552 0.0305 0.0464 0.0009 432 157 309 23 293 6 44 31 94 150 0.62 0.0531 0.0040 0.3440 0.0253 0.0470 0.0009 332 134 300 19 296 5 45 456 370 1004 0.37 0.0730 0.0017 1.0394 0.0234 0.1033 0.0012 1015 27 724 12 634 7 46 91 136 229 0.60 0.0593 0.0029 0.7408 0.0351 0.0907 0.0014 577 77 563 20 560 8 47 50 156 259 0.60 0.0531 0.0045 0.3191 0.0265 0.0436 0.0009 333 152 281 20 275 6 15HBS-TW1 48 30 97 132 0.73 0.0541 0.0039 0.3798 0.0268 0.0509 0.0009 376 127 327 20 320 6 49 33 114 164 0.69 0.0527 0.0042 0.3355 0.0261 0.0462 0.0009 315 143 294 20 291 5 50 51 50 156 0.32 0.0562 0.0031 0.5719 0.0312 0.0738 0.0012 460 93 459 20 459 7 51 43 74 197 0.37 0.0560 0.0039 0.3837 0.0259 0.0497 0.0009 452 118 330 19 313 6 52 24 70 91 0.77 0.0527 0.0052 0.4324 0.0420 0.0595 0.0013 317 179 365 30 373 8 53 81 256 394 0.65 0.0567 0.0035 0.3634 0.0216 0.0465 0.0008 479 102 315 16 293 5 54 31 90 139 0.65 0.0520 0.0039 0.3653 0.0266 0.0510 0.0009 285 134 316 20 321 6 55 16 21 49 0.42 0.0548 0.0063 0.5692 0.0648 0.0754 0.0017 403 214 458 42 469 10 56 98 245 297 0.82 0.0579 0.0023 0.6007 0.0230 0.0753 0.0010 526 61 478 15 468 6 57 14 30 64 0.46 0.0503 0.0068 0.3447 0.0458 0.0497 0.0013 211 248 301 35 313 8 58 1254 447 1105 0.40 0.0918 0.0012 3.2622 0.0434 0.2579 0.0027 1463 12 1472 10 1479 14 59 10 25 46 0.56 0.0518 0.0088 0.3432 0.0574 0.0481 0.0014 275 303 300 43 303 9 60 37 65 115 0.57 0.0585 0.0049 0.5925 0.0489 0.0735 0.0015 548 145 472 31 457 9 61 50 91 242 0.38 0.0516 0.0031 0.3362 0.0196 0.0473 0.0007 267 106 294 15 298 5 62 37 88 171 0.51 0.0587 0.0042 0.3951 0.0274 0.0488 0.0009 557 120 338 20 307 6 63 15 14 72 0.20 0.0569 0.0071 0.3652 0.0445 0.0466 0.0013 488 223 316 33 293 8 64 80 56 276 0.20 0.0554 0.0024 0.5012 0.0213 0.0656 0.0009 430 70 413 14 410 6 65 55 44 187 0.23 0.0576 0.0037 0.5279 0.0329 0.0665 0.0012 515 106 430 22 415 7 66 61 138 208 0.66 0.0560 0.0027 0.5101 0.0240 0.0661 0.0010 452 79 419 16 413 6 67 28 63 91 0.70 0.0612 0.0062 0.5989 0.0590 0.0710 0.0018 646 170 477 37 442 11 68 12 25 61 0.41 0.0599 0.0112 0.3711 0.0683 0.0450 0.0017 601 338 320 51 283 10 69 63 139 199 0.70 0.0569 0.0043 0.5616 0.0419 0.0717 0.0014 486 130 453 27 447 9 70 55 104 184 0.56 0.0551 0.0039 0.5186 0.0356 0.0684 0.0012 415 122 424 24 426 7 71 28 45 83 0.54 0.0617 0.0090 0.6461 0.0920 0.0760 0.0024 665 257 506 57 472 14 72 34 104 164 0.63 0.0533 0.0067 0.3459 0.0428 0.0472 0.0013 339 228 302 32 297 8 73 32 39 98 0.40 0.0560 0.0065 0.5814 0.0663 0.0753 0.0019 454 209 465 43 468 12 74 21 27 59 0.45 0.0681 0.0119 0.7600 0.1290 0.0810 0.0035 871 290 574 74 502 21 75 20 50 90 0.56 0.0536 0.0103 0.3796 0.0716 0.0514 0.0018 355 336 327 53 323 11 76 41 127 186 0.68 0.0542 0.0058 0.3754 0.0390 0.0503 0.0012 380 190 324 29 316 8 77 65 156 299 0.52 0.0612 0.0074 0.4173 0.0489 0.0495 0.0015 647 204 354 35 311 9 78 37 70 102 0.69 0.0608 0.0126 0.6838 0.1400 0.0816 0.0028 633 389 529 84 506 17 79 18 30 76 0.40 0.0461 0.0146 0.3142 0.0979 0.0495 0.0028 449 510 277 76 311 17 15HBS-TW2 01 25 62 133 0.46 0.0501 0.0057 0.2932 0.0330 0.0425 0.0008 201 218 261 26 268 5 02 149 454 775 0.59 0.0546 0.0028 0.3259 0.0160 0.0433 0.0006 396 117 286 12 273 3 03 42 197 219 0.90 0.0500 0.0037 0.2987 0.0218 0.0434 0.0007 195 134 265 17 274 5 04 77 283 407 0.70 0.0510 0.0031 0.3005 0.0182 0.0428 0.0006 242 113 267 14 270 4 05 36 101 192 0.53 0.0605 0.0050 0.3566 0.0286 0.0428 0.0009 623 137 310 21 270 6 06 36 115 197 0.58 0.0512 0.0048 0.2961 0.0274 0.0420 0.0008 248 175 263 21 265 5 07 92 350 484 0.72 0.0529 0.0031 0.3150 0.0180 0.0432 0.0007 326 100 278 14 273 4 08 62 182 332 0.55 0.0530 0.0032 0.3105 0.0186 0.0426 0.0007 328 106 275 14 269 4 09 29 86 150 0.57 0.0524 0.0050 0.3148 0.0298 0.0436 0.0008 302 181 278 23 275 5 10 30 90 156 0.58 0.0499 0.0061 0.2994 0.0361 0.0436 0.0010 190 229 266 28 275 6 11 58 319 313 1.02 0.0591 0.0041 0.3464 0.0236 0.0426 0.0008 570 116 302 18 269 5 12 80 412 432 0.96 0.0523 0.0033 0.3043 0.0189 0.0422 0.0007 299 111 270 15 267 4 13 50 147 267 0.55 0.0518 0.0037 0.3025 0.0216 0.0424 0.0007 275 133 268 17 268 4 14 17 39 81 0.48 0.0580 0.0045 0.3422 0.0260 0.0428 0.0009 529 131 299 20 270 5 15 31 78 168 0.47 0.0525 0.0056 0.3073 0.0322 0.0425 0.0009 307 199 272 25 268 5 
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