Zircon U-Pb ages and Hf isotopic compositions of the granites from Bayanwula area and their geological significance
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摘要:
二连盆地中部巴彦乌拉地区位于中亚造山带东段，发育有多个砂岩型铀矿床（点）。利用LA-ICP-MS锆石U-Pb同位素和Hf同位素分析对巴彦乌拉地区巴音宝力格隆起东部花岗岩开展了年代学研究。结果显示，2个样品的锆石U-Pb年龄在292±3~288±2 Ma之间，与巴彦乌拉地区巴音宝力格隆起中西部发育的早二叠世花岗岩及流纹岩的年龄范围基本一致。结合区域成岩年代学数据可知，巴彦乌拉地区巴音宝力格隆起发育一条主要由晚石炭世—早二叠世花岗岩及火山岩组成的岩浆岩带。锆石Hf同位素数据显示，2个花岗岩样品的εHf（t）值为+10.6~+18.2，表明其源区为新生下地壳物质。综合区域地质特征可知，中亚造山带东段显生宙的构造-岩浆活动与二连盆地中部及巴彦乌拉地区赛汉组上段砂岩型铀成矿作用关系密切，为砂岩型铀矿床的形成提供了一系列有利条件。
Abstract:The Bayanwula area is located in the middle part of the Erlian Basin, eastern part of the Central Asian orogenic belt, and hosts some sand-type uranium deposits.In this paper, the authors present two LA-ICP-MS zircon U-Pb ages and Hf isotopic compositions for granites from the study area, which show that the emplacement ages of these granitic rocks are 292±3 Ma and 288±2 Ma.Theses ages are consistent with those of granitic and volcanic rocks occurring in the Bayinbaolige horst of the Bayanwula area.The data obtained by the authors and previously published data indicate that a magma belt consisting of Late Carboniferous-Early Permian granitic and volcanic rocks were developed in the Bayinbaolige horst of the Bayanwula area.Zircon Hf isotopic compositions show that two granite samples have εHf(t)values of +10.6 to +18.2, which are similar to those of the Early Permian granitic rocks located on the Bayinbaolige horst of the study area, indicating that the granites were derived from the partial melting of juvenile lower crust.Integrated with geological data, this study indicates that the formation of the sand-type uranium deposits developed in the upper member of the Saihan Formation was associated with tectonic-magmatism processes that happened in the eastern part of the Central Asian orogenic belt during Phanerozoic, which provided many optimum conditions for these sand-type uranium deposits.
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Key words:
- Erlian Basin /
- Bayanwula /
- sand-type uranium deposit /
- zircon U-Pb age /
- Hf isotope
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表 1 二连盆地主要花岗质岩石及火山岩成岩年龄
Table 1. Ages of the granitic and volcanic rocks from the Erlian Basin
序号 位置 岩性 方法 年龄/Ma 参考文献 1 二连浩特市东北部赛音乌苏 花岗闪长岩 LA-ICP-MS锆石U-Pb 273.8±1.6 [30] 2 二连浩特市东北部赛音乌苏 正长花岗岩 272.6±2.8 3 二连浩特市东北部赛音乌苏 黑云母二长花岗岩 308.1±3.5 4 二连浩特市东北部雅果敖包 花岗岩 271.8±1.4 5 二连浩特市东北部干次呼都格 黑云母二长花岗岩 270.1±2.7 6 二连浩特市东北部哈拉图庙 正长花岗岩 317.5±2.8 7 苏尼特左旗东部 东苏二长花岗岩 LA-ICP-MS锆石U-Pb 221.5±0.81 [21] 8 苏尼特左旗白音乌拉地区 霓石碱性花岗岩 SHRIMP锆石U-Pb 283.2±1.9 [31] 9 苏尼特左旗白音乌拉地区 霓石碱性花岗岩 273±4.4 10 巴音宝力格卫镜 花岗岩 LA-ICP-MS锆石U-Pb 148~143 [32] 11 苏尼特右旗敖包吐 二长花岗岩 LA-ICP-MS锆石U-Pb 143.37±0.83 [33] 12 苏尼特右旗敖包吐 正长花岗岩 142.58±0.61 13 苏尼特左旗宝德尔 花岗岩 LA-ICP-MS锆石U-Pb 132±1 [34] 14 苏尼特左旗查干敖包 安山岩 LA-ICP-MS锆石U-Pb 136.1±1.1 [14] 15 苏尼特左旗查干敖包 安山岩 500.8±2 16 苏尼特右旗吉布胡楞土 石榴子石白云母花岗岩 LA-ICP-MS锆石U-Pb 133.3±1.1 [35] 17 苏尼特左旗祖日和图 花岗岩 SHRIMP锆石U-Pb 423±8 [16, 36] 18 苏尼特左旗祖日和图 花岗岩 424±10 19 苏尼特左旗沙尔塔拉 花岗岩 LA-ICP-MS锆石U-Pb 222±4 20 苏尼特左旗阿尔善 黑云二长花岗岩 LA-ICP-MS锆石U-Pb 308.0±1.2 [20] 21 苏尼特左旗阿尔善 黑云二长花岗岩 311.8±1.2 22 苏尼特左旗阿尔善 黑云二长花岗岩 309.1±1.2 23 巴彦乌拉地区 流纹岩 SHRIMP锆石U-Pb 307.1±6.3 [37] 24 巴彦乌拉地区 流纹岩 308.9±1.8 25 苏尼特左旗花椎饶木 片麻状花岗岩 LA-ICP-MS锆石U-Pb 1373.2±7.4 [38] 26 苏尼特左旗花椎饶木 片麻状花岗岩 1398±10 27 苏尼特左旗花椎饶木 片麻状花岗岩 1392±16 28 苏尼特左旗花椎饶木 片麻状花岗岩 1399±11 29 莫若格钦 二长闪长岩 SHRIMP锆石U-Pb 312.6±4.1 [39] 30 白音乌拉 花岗岩 全岩Rb-Sr 286±3 [40] 31 组横得楞 花岗岩 284±2 32 组横得楞 花岗岩 276±7 33 扎那乌拉 花岗岩 277±3 34 白音宝力道 石英闪长岩 SHRIMP锆石U-Pb 309±8 [22] 35 白音宝力道 石英闪长岩 SHRIMP锆石U-Pb 490±8 36 包尔汉喇嘛庙 花岗岩 全岩Rb-Sr 228±21 37 苏尼特左旗准苏吉花 花岗岩 SHRIMP锆石U-Pb 298.2±3.1 [41] 38 巴彦乌拉地区 花岗岩 SIMS锆石U-Pb 289.0±2.2 [19] 39 巴彦乌拉地区 花岗岩 288.3±2.3 40 巴彦乌拉地区 花岗岩 290.0±2.2 41 巴彦乌拉地区 花岗岩 290.0±2.6 42 苏尼特左旗东北部 流纹岩 LA-ICP-MS锆石U-Pb 279.4±2.9 [18] 43 苏尼特左旗东北部 流纹岩 291.6±2.9 44 苏尼特左旗东北部 安山岩 286.4±3.8~292.3±5.2 45 苏尼特左旗东北部 流纹岩 282.1±1.6 46 苏尼特左旗东北部 流纹岩 285.5±2.4 47 苏尼特左旗东北部 流纹岩 281.2±2.0 48 宝力道 花岗闪长岩 LA-ICP-MS锆石U-Pb 316±1 [15] 49 宝力道 二长花岗岩 322±1 50 哈拉图 正长花岗岩 233±2 51 哈拉图 正长花岗岩 344±2 52 苏尼特左旗东北部 流纹岩 LA-ICP-MS锆石U-Pb 272.1±3.1 [17] 53 苏尼特左旗东北部 流纹岩 271.4±1.7 
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表 2 巴彦乌拉花岗岩LA-ICP-MS锆石U-Th-Pb同位素数据
Table 2. LA-ICP-MS zircon U-Th-Pb data of the Bayanwula granites
点号 元素含量/10-6 Th/U 同位素比值 年龄/Ma Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ DEL4-1 1 156 191 0.8 0.0538 0.0033 0.3616 0.0202 0.0465 0.0008 361 139 313 15 293 5 2 538 426 1.3 0.0525 0.0031 0.3411 0.0194 0.0462 0.0007 306 135 298 15 291 4 3 193 155 1.2 0.053 0.0043 0.3608 0.0235 0.0461 0.0008 332 153 313 18 291 5 4 268 274 1 0.0572 0.0038 0.363 0.0231 0.0462 0.0008 502 144 314 17 291 5 5 234 277 0.8 0.0561 0.0036 0.3628 0.0217 0.046 0.0007 454 144 314 16 290 5 6 260 298 0.9 0.0585 0.0029 0.3739 0.0181 0.0463 0.0007 546 109 323 13 292 4 7 209 285 0.7 0.0546 0.0034 0.3483 0.0211 0.0463 0.0008 394 136 303 16 292 5 8 435 321 1.4 0.0563 0.0029 0.3658 0.0173 0.0465 0.0008 465 113 317 13 293 5 9 224 201 1.1 0.0466 0.0044 0.2994 0.0281 0.0464 0.0009 28 215 266 22 293 6 10 403 310 1.3 0.0514 0.0082 0.3218 0.0494 0.0462 0.0011 261 330 283 38 291 7 DEL6-1 1 318 513 0.6 0.078 0.0042 0.5057 0.033 0.0458 0.0006 1148 106 416 22 288 4 2 274 469 0.6 0.0531 0.0017 0.334 0.0106 0.0455 0.0005 345 103 293 8 287 3 3 296 496 0.6 0.0546 0.0018 0.3467 0.0115 0.0459 0.0005 394 79 302 9 290 3 4 259 457 0.6 0.0698 0.0023 0.4387 0.0137 0.0456 0.0005 924 69 369 10 288 3 5 306 516 0.6 0.0523 0.0019 0.3297 0.012 0.0456 0.0005 298 88 289 9 288 3 6 276 462 0.6 0.0651 0.0034 0.4226 0.0244 0.046 0.0005 789 110 358 17 290 3 7 266 414 0.6 0.0869 0.0029 0.5521 0.0192 0.046 0.0006 1367 65 446 13 290 4 8 194 377 0.5 0.0538 0.0022 0.3409 0.0133 0.0462 0.0005 361 58 298 10 291 3 9 312 517 0.6 0.0516 0.0018 0.3298 0.0117 0.0461 0.0005 333 78 289 9 290 3 10 206 394 0.5 0.0535 0.0017 0.3421 0.0113 0.0463 0.0006 350 79 299 9 292 3 11 347 563 0.6 0.0598 0.002 0.3757 0.0125 0.0456 0.0005 594 70 324 9 287 3 12 301 464 0.6 0.0539 0.0019 0.3406 0.0127 0.0457 0.0005 365 86 298 10 288 3 13 216 412 0.5 0.0545 0.0019 0.3432 0.0118 0.0456 0.0005 391 78 300 9 287 3 14 312 477 0.7 0.055 0.0018 0.3487 0.0116 0.0458 0.0005 413 72 304 9 289 3 15 290 487 0.6 0.0535 0.0019 0.3361 0.0124 0.0454 0.0005 350 47 294 9 286 3 16 276 462 0.6 0.0605 0.002 0.377 0.0118 0.0454 0.0005 633 72 325 9 286 3
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表 3 巴彦乌拉花岗岩LA-ICP-MS锆石Hf同位素数据
Table 3. LA-ICP-MS zircon Hf isotopic data of the Bayanwula granites
测试点 176Yb/177Hf 2σ 176Lu/177Hf 2σ 176Hf/177Hf 2σ εHf(t) (176Hf/177Hf)i tDM1/Ga tDM2/Ga fLu/Hf DTL4-1 1 0.123430 0.00146 0.003906 0.00004 0.283009 0.00003 14.0 0.2829881 0.37 0.41 -0.88 2 0.114380 0.00117 0.003799 0.00004 0.282991 0.00004 13.4 0.2829706 0.40 0.45 -0.89 3 0.140461 0.00068 0.004559 0.00002 0.283049 0.00004 15.3 0.2830242 0.32 0.33 -0.86 4 0.171006 0.00017 0.005291 0.00000 0.282997 0.00004 13.3 0.2829678 0.41 0.46 -0.84 5 0.135208 0.00189 0.004337 0.00007 0.283023 0.00004 14.5 0.2829994 0.36 0.38 -0.87 6 0.204132 0.00065 0.006093 0.00003 0.283001 0.00004 13.3 0.2829677 0.41 0.46 -0.82 7 0.069771 0.00014 0.002198 0.00001 0.283033 0.00003 15.2 0.2830215 0.32 0.33 -0.93 DTL6-1 1 0.120610 0.00116 0.003891 0.00004 0.282993 0.00005 13.4 0.2829723 0.40 0.45 -0.88 2 0.106987 0.00191 0.003105 0.00006 0.283021 0.00004 14.6 0.2830046 0.35 0.37 -0.91 3 0.094634 0.00205 0.002852 0.00007 0.282923 0.00004 11.1 0.2829073 0.49 0.60 -0.91 4 0.110835 0.00094 0.003088 0.00002 0.283010 0.00003 14.2 0.2829937 0.36 0.40 -0.91 5 0.090262 0.00040 0.002561 0.00001 0.283008 0.00003 14.2 0.2829940 0.36 0.40 -0.92 6 0.092246 0.00040 0.002761 0.00002 0.282972 0.00003 12.9 0.2829571 0.42 0.48 -0.92 7 0.101883 0.00067 0.003002 0.00004 0.282919 0.00004 11.0 0.2829029 0.50 0.60 -0.91 8 0.108565 0.00027 0.003219 0.00001 0.282985 0.00004 13.3 0.2829680 0.40 0.46 -0.90 9 0.098435 0.00057 0.002786 0.00002 0.282906 0.00003 10.6 0.2828905 0.52 0.63 -0.92 10 0.096773 0.00127 0.002939 0.00002 0.282958 0.00004 12.3 0.2829425 0.44 0.52 -0.91 11 0.071801 0.00038 0.002061 0.00001 0.282988 0.00004 13.6 0.2829770 0.38 0.44 -0.94 12 0.108385 0.00189 0.003246 0.00006 0.282939 0.00004 11.6 0.2829211 0.47 0.57 -0.90 13 0.090677 0.00086 0.002912 0.00003 0.282990 0.00004 13.5 0.2829743 0.39 0.45 -0.91
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① 核工业二〇八大队.内蒙古二连盆地铀矿调查与勘查.2015.
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