Sedimentary environment, formation age and significance of the Middle Permian Zhesi Formation in Zhuolunyinnuoer, Sonid Left Banner, Inner Mongolia
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摘要:
内蒙古苏尼特左旗卓仑音诺尔地区哲斯组可以分为下部的粉砂岩、页岩段和上部的砾岩-砂岩段，分别代表扇中亚相的漫流沉积和扇根亚相的近源快速沉积，反映研究区二叠纪以陆相盆地干旱型冲积扇为特征的岩相古地理面貌。碎屑岩年代学研究揭示，哲斯组的物源为兴安-艾力格庙地块、早古生代的岛弧岩浆岩带及晚石炭世和早二叠世的岩浆岩体，表明盆地具有复杂源区。测年样品中最年轻一组锆石年龄的峰值为281Ma，侵入该组的石英闪长玢岩年龄为248±3Ma，限定陆相盆地的形成时代为中二叠世-三叠纪初。区域地质分析表明，中-晚二叠世兴蒙造山带中西部的不同地区均发育陆源碎屑沉积盆地，但层序特征各不相同，可能属于互不连通的小型盆地，代表二叠纪的盆岭构造，揭示兴蒙造山带在二叠纪整体处于陆内伸展的构造环境。
Abstract:The Zhesi Formation can be divided into siltstone-shale member in the lower part and conglomerate-sandstone member in the upper part in Zhuolunyinnoer, southern Sonid Left Banner, Inner Mongolia, representing overbank deposition of middle fan subfacies and proximal rapid deposition of inner fan subfacies, respectively and implying a paleogeographic framework characterized by alluvial fan in intracontinental basin with the shallow water and oxidation conditions. Geochronological research on detrital zircon reveals a complex provenance containing the Xing'an-Ailigemiao block, the early Paleozoic arc belt and late Carboniferious and early Permian plutons. The youngest detrital zircon peak age of 281Ma from the Zhesi Formation and another age of 248±3Ma from diorite porphyrite that intruded into the Zhesi Formation were obtained in the study area, which shows that the formation age of the Zhesi Formation is between the Middle Permian and Early Triassic. Regional geology analysis reveals that there existed middle to Late Permian terrigenous clastic sedimentary basins in the central and western parts of the Xing-Meng orogenic belt (XMOB). They were isolated from each other with different sedimentary sequences, suggesting "basin-and-ridge" structure style and intracontinental extensional tectonic setting during the Permian in the XMOB.
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Key words:
- Sonid Left Banner /
- Permian /
- sedimentary basin /
- geochronology
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上覆温都尔庙群哈尔哈达组灰褐色绢云石英片岩 
23.紫红色中-薄层状石英岩屑砂岩 14.2m 22.紫红色中厚层状粗粒石英岩屑砂岩 75.4m 21.灰褐色厚层状复成分砾岩 37.5m 20.紫红色中厚层状细粒岩屑砂岩 131.7m 19.紫红色晶屑玻屑凝灰岩 27.1m 18.紫红色厚层状含砾岩屑粗砂岩 54.9m 17.紫红色中-薄层状岩屑细砂岩 50.1m 16.紫红色厚层状复成分砾岩 13.9m 15.紫红色薄层状石英粉砂岩夹灰绿色中粗粒砂岩 62.2m 14.灰绿色角闪安山岩 38m 13.灰绿色中厚层状硬砂质石英岩屑砂岩夹灰绿色晶屑凝灰岩 63.3m 12.紫红色厚层状粗粒硬砂质岩屑砂岩 27.6m 11.紫红色厚层状复成分砾岩 126.1m 10.灰绿色中厚层状硬砂质石英砂岩 11.8m 9.紫红色厚层状复成分砾岩 100.7m 8.紫红色厚层状含砾岩屑粗砂岩 89.9m 7.紫红色，灰绿色粉砂质页岩 65.5m 6.灰褐色中厚层状岩屑细砂岩夹紫红色厚层状复成分砾岩透镜体 8.1m 5.紫红色钙质粉砂质页岩 29.1m 4.紫红色薄层状钙质粉砂岩 106.9m 3.黄绿色薄层状岩屑细砂岩与页岩互层，发育沉积韵律 100.2m 2.黄褐色中厚层状含砾岩屑粗砂岩 9.7m 1.紫红色薄层状粉砂岩、钙质粉砂岩夹少量粉砂质泥岩 53.2m
下伏上石炭统阿木山组结晶灰岩 
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表 1 哲斯组砾岩锆石U-Th-Pb年龄测试数据
Table 1. Zircon U-Th-Pb chronological data of conglomerate in the Zhesi Formation
测点 同位素比值 年龄/Ma 不谐和度 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 1 0.05786 0.00262 0.59145 0.02556 0.07414 0.00101 524 102 472 16 461 6 2.39% 2 0.06022 0.00116 0.65494 0.0131 0.0789 0.001 611 23 512 8 490 6 4.49% 3 0.05463 0.0013 0.56622 0.01373 0.07519 0.00098 397 32 456 9 467 6 -2.36% 4 0.0805 0.00121 2.37531 0.03847 0.21404 0.00265 1209 15 1235 12 1250 14 -3.28% 5 0.05283 0.00121 0.3743 0.00875 0.0514 0.00066 322 30 323 6 323 4 0.00% 6 0.05476 0.00115 0.59036 0.0128 0.07821 0.001 402 27 471 8 485 6 -2.89% 7 0.05099 0.00122 0.37392 0.00912 0.0532 0.00069 240 33 323 7 334 4 -3.29% 8 0.05306 0.001 0.32492 0.00636 0.04443 0.00056 331 23 286 5 280 3 2.14% 9 0.05365 0.00165 0.55319 0.01707 0.0748 0.00102 356 45 447 11 465 6 -3.87% 10 0.05469 0.00158 0.38749 0.01126 0.0514 0.00069 400 41 333 8 323 4 3.10% 11 0.05275 0.00098 0.31563 0.00614 0.04341 0.00055 318 23 279 5 274 3 1.82% 12 0.05508 0.00204 0.39591 0.01373 0.05213 0.00068 416 85 339 10 328 4 3.35% 130.062840.003220.320690.015820.037010.0005270311228212234320.51%14 0.05125 0.00127 0.38611 0.0097 0.05466 0.00071 252 34 332 7 343 4 -3.21% 15 0.05533 0.00091 0.54652 0.00953 0.07166 0.00089 426 19 443 6 446 5 -0.67% 16 0.05153 0.00108 0.32248 0.00695 0.0454 0.00058 265 27 284 5 286 4 -0.70% 17 0.05599 0.00095 0.62155 0.01113 0.08055 0.00101 452 20 491 7 499 6 -1.60% 18 0.05068 0.00095 0.34825 0.00682 0.04986 0.00063 226 23 303 5 314 4 -3.50% 19 0.05284 0.00118 0.53041 0.01209 0.07284 0.00094 322 29 432 8 453 6 -4.64% 20 0.05175 0.00132 0.3093 0.00801 0.04337 0.00057 274 36 274 6 274 4 0.00% 210.064540.002920.460340.020490.051750.000837596738414325518.15%22 0.05087 0.00186 0.34194 0.01244 0.04877 0.00069 235 58 299 9 307 4 -2.61% 23 0.05045 0.00132 0.38716 0.01026 0.05568 0.00073 216 37 332 8 349 4 -4.87% 24 0.05563 0.00125 0.61703 0.01412 0.08048 0.00104 438 29 488 9 499 6 -2.20% 25 0.05067 0.00141 0.32429 0.00909 0.04644 0.00062 226 40 285 7 293 4 -2.73% 26 0.04965 0.00091 0.30406 0.00582 0.04444 0.00056 179 23 270 5 280 3 -3.57% 27 0.05108 0.00175 0.35983 0.01236 0.05112 0.0007 244 54 312 9 321 4 -2.80% 28 0.05443 0.00196 0.32272 0.01151 0.04302 0.00062 389 54 284 9 272 4 4.41% 29 0.06407 0.00362 0.71521 0.03899 0.08097 0.00121 744 123 548 23 502 7 9.16% 30 0.07619 0.00139 2.1351 0.0405 0.20336 0.00258 1100 19 1160 13 1193 14 -7.80% 31 0.05011 0.00168 0.34917 0.01171 0.05057 0.0007 200 52 304 9 318 4 -4.40% 32 0.05264 0.00156 0.41154 0.01222 0.05674 0.00077 313 43 350 9 356 5 -1.69% 33 0.05335 0.00088 0.53604 0.00938 0.07293 0.00091 344 19 436 6 454 5 -3.96% 34 0.05122 0.00122 0.36059 0.00873 0.0511 0.00066 251 32 313 7 321 4 -2.49% 35 0.05007 0.00107 0.32061 0.00705 0.04647 0.00059 198 28 282 5 293 4 -3.75% 36 0.05055 0.00364 0.36054 0.02568 0.05176 0.00089 220 130 313 19 325 5 -3.69% 37 0.05049 0.00203 0.32098 0.01285 0.04614 0.00066 218 66 283 10 291 4 -2.75% 38 0.05287 0.00122 0.50783 0.01195 0.06972 0.0009 323 31 417 8 434 5 -3.92% 39 0.04829 0.00109 0.30173 0.00693 0.04535 0.00058 114 31 268 5 286 4 -6.29% 40 0.05402 0.00101 0.53221 0.01033 0.0715 0.0009 372 23 433 7 445 5 -2.70% 41 0.05009 0.00238 0.36064 0.01701 0.05226 0.00079 199 81 313 13 328 5 -4.57% 42 0.05092 0.00121 0.34226 0.00828 0.04879 0.00063 237 33 299 6 307 4 -2.61% 43 0.05047 0.00169 0.34913 0.01169 0.05021 0.0007 217 52 304 9 316 4 -3.80% 44 0.04875 0.0011 0.33166 0.00761 0.04938 0.00063 136 31 291 6 311 4 -6.43% 45 0.0524 0.00123 0.52467 0.01248 0.07268 0.00094 303 31 428 8 452 6 -5.31% 46 0.04991 0.00127 0.3441 0.00883 0.05004 0.00065 191 36 300 7 315 4 -4.76% 47 0.05082 0.00177 0.37026 0.01287 0.05288 0.00075 233 54 320 10 332 5 -3.61% 48 0.05173 0.00144 0.37122 0.0104 0.05209 0.00069 273 40 321 8 327 4 -1.83% 49 0.0566 0.00098 0.55264 0.00997 0.07087 0.00089 476 20 447 7 441 5 1.36% 50 0.05341 0.00202 0.39398 0.01476 0.05355 0.00078 346 58 337 11 336 5 0.30% 51 0.07928 0.00185 2.29389 0.05401 0.21004 0.00282 1179 26 1210 17 1229 15 -4.07% 52 0.04959 0.00137 0.34574 0.00959 0.05061 0.00067 176 40 302 7 318 4 -5.03% 53 0.04901 0.00106 0.30163 0.00664 0.04468 0.00057 148 29 268 5 282 4 -4.96% 54 0.0536 0.00097 0.59059 0.01115 0.07998 0.001 354 22 471 7 496 6 -5.04% 55 0.05043 0.00121 0.36548 0.00892 0.05261 0.00068 215 33 316 7 331 4 -4.53% 56 0.04856 0.00258 0.34563 0.01821 0.05167 0.00079 127 92 301 14 325 5 -7.38% 57 0.05529 0.00112 0.60959 0.01271 0.08003 0.00102 424 25 483 8 496 6 -2.62% 58 0.05687 0.00123 0.35278 0.0078 0.04503 0.00058 486 27 307 6 284 4 8.10% 59 0.05277 0.00106 0.53453 0.01102 0.07354 0.00093 319 25 435 7 457 6 -4.81% 60 0.06068 0.00174 0.42186 0.01209 0.05047 0.00069 628 38 357 9 317 4 12.62% 61 0.0596 0.00235 0.40319 0.01498 0.04906 0.00066 589 88 344 11 309 4 11.33% 62 0.05215 0.0009 0.49514 0.00893 0.06892 0.00086 292 20 408 6 430 5 -5.12% 63 0.04952 0.00134 0.34621 0.00945 0.05076 0.00067 173 39 302 7 319 4 -5.33% 64 0.0486 0.00213 0.33832 0.01473 0.05054 0.00074 129 73 296 11 318 5 -6.92% 65 0.05569 0.00116 0.59103 0.01258 0.07704 0.00098 440 26 472 8 478 6 -1.26% 66 0.05382 0.001 0.52227 0.01006 0.07045 0.00089 364 22 427 7 439 5 -2.73% 67 0.05282 0.00102 0.32453 0.00647 0.04461 0.00056 321 24 285 5 281 3 1.42% 68 0.04777 0.00112 0.28022 0.00667 0.04259 0.00055 88 33 251 5 269 3 -6.69% 690.070110.004290.363570.021550.037610.0005793212931516238432.35%70 0.04879 0.00202 0.3319 0.01367 0.04939 0.00071 138 69 291 10 311 4 -6.43% 71 0.04899 0.00124 0.33867 0.00867 0.0502 0.00066 147 36 296 7 316 4 -6.33% 72 0.05262 0.0014 0.56067 0.01496 0.07736 0.00103 312 37 452 10 480 6 -5.83% 73 0.05427 0.00109 0.40082 0.00825 0.05362 0.00068 382 25 342 6 337 4 1.48% 74 0.05189 0.00094 0.50592 0.00952 0.0708 0.00089 281 22 416 6 441 5 -5.67% 注：带删除线数据为不谐合度较大的数据
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表 2 石英闪长玢岩锆石U-Th-Pb年龄测试数据
Table 2. Zircon U-Th-Pb chronological data of quartz diorite porphyrite
测点 含量/10-6 Th/U 同位素比值 年龄/Ma U Th 207Pb/206Pb 1σ 207Pb/235Pb 1σ 206Pb/238Pb 1σ 207Pb/206Pb 1σ 207Pb/235Pb 1σ 206Pb/238Pb 1σ 1 129 54.2 0.4202 0.0553 0.0067 0.34 0.038 0.0451 0.0014 280 240 292 29 284.3 8.7 2 102.6 87.6 0.8538 0.0506 0.0051 0.297 0.029 0.0429 0.0014 150 190 261 22 270.9 8.7 3 131 65.1 0.4969 0.0538 0.0056 0.271 0.027 0.0368 0.001 260 210 241 22 233.2 6.4 4 214 180 0.8411 0.0507 0.0032 0.32 0.023 0.0446 0.0013 220 140 280 17 281.4 8 5 251 171.8 0.6845 0.0483 0.0033 0.27 0.018 0.0401 0.0011 110 140 242 15 253.3 7.1 6 65.6 59.6 0.9085 0.0542 0.0071 0.277 0.035 0.0374 0.0014 240 260 244 28 236.5 8.7 7 831 393 0.4729 0.0508 0.0019 0.276 0.01 0.0394 0.00053 212 84 247.4 8.4 249.1 3.3 8 108.8 133.7 1.2289 0.0498 0.0042 0.267 0.022 0.0391 0.00099 130 170 239 18 247.4 6.1 9 59.8 49 0.8194 0.0562 0.008 0.286 0.035 0.0387 0.0021 280 270 251 27 244 13 10 93.5 84.6 0.9048 0.0536 0.006 0.293 0.032 0.0398 0.0012 290 240 257 25 251.4 7.5 11 74.2 72.8 0.9811 0.078 0.014 0.42 0.083 0.0405 0.002 810 360 354 62 256 13 12 129 98 0.7597 0.0632 0.0068 0.345 0.035 0.0399 0.0012 570 210 297 26 252.1 7.3 13 333.9 278.8 0.835 0.0513 0.003 0.273 0.015 0.0385 0.00064 220 120 244 12 243.8 4 14 122.7 100.5 0.8191 0.0483 0.0044 0.259 0.021 0.0392 0.0013 70 170 232 17 247.9 7.8 15 386 292 0.7565 0.0595 0.0056 0.44 0.1 0.0494 0.006 480 160 350 58 310 36 16 70.9 55.2 0.7786 0.0459 0.0056 0.242 0.029 0.0375 0.0015 -10 240 217 24 236.9 9.6 17 62 50.8 0.8194 0.0446 0.0073 0.244 0.037 0.0402 0.0015 -160 280 217 30 254.2 9 18 147 109 0.7415 0.0545 0.0057 0.294 0.031 0.0395 0.0013 360 230 259 23 249.5 8 19 597 560 0.938 0.0518 0.0021 0.287 0.011 0.0401 0.00051 254 91 255.5 9 253.2 3.1 20 85.9 87.7 1.021 0.0499 0.0053 0.264 0.028 0.0383 0.0011 110 210 235 22 242 7 21 85.4 61.3 0.7178 0.081 0.021 0.52 0.17 0.0446 0.0025 700 410 399 99 281 15 22 56.9 37.8 0.6643 0.086 0.022 0.53 0.16 0.041 0.0019 740 400 383 86 259 12 23 51.1 27.4 0.5362 0.0491 0.0074 0.28 0.039 0.0408 0.0017 80 290 245 31 257 10
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① 徐备, 陈斌, 白志强, 等. 1: 5万额尔德尼布拉格幅.北京大学, 1994.
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