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    内蒙古二连-东乌旗地区晚石炭世碱性花岗岩时代、成因及地质意义

    王树庆 辛后田 张永 刘文刚

    王树庆, 辛后田, 张永, 刘文刚, 2022. 内蒙古二连-东乌旗地区晚石炭世碱性花岗岩时代、成因及地质意义. 地球科学, 47(4): 1295-1315. doi: 10.3799/dqkx.2021.081
    引用本文: 王树庆, 辛后田, 张永, 刘文刚, 2022. 内蒙古二连-东乌旗地区晚石炭世碱性花岗岩时代、成因及地质意义. 地球科学, 47(4): 1295-1315. doi: 10.3799/dqkx.2021.081
    Wang Shuqing, Xin Houtian, Zhang Yong, Liu Wengang, 2022. Geochronology and Petrogenesis of Late Carboniferous Alkaline Granites from Erlian-Dongwuqi Region, and Its Geological Significance. Earth Science, 47(4): 1295-1315. doi: 10.3799/dqkx.2021.081
    Citation: Wang Shuqing, Xin Houtian, Zhang Yong, Liu Wengang, 2022. Geochronology and Petrogenesis of Late Carboniferous Alkaline Granites from Erlian-Dongwuqi Region, and Its Geological Significance. Earth Science, 47(4): 1295-1315. doi: 10.3799/dqkx.2021.081

    内蒙古二连-东乌旗地区晚石炭世碱性花岗岩时代、成因及地质意义

    doi: 10.3799/dqkx.2021.081
    基金项目: 

    中国地质调查项目 DD20190038

    中国地质调查项目 DD20160041

    国家自然科学基金面上项目 41872068

    详细信息
      作者简介:

      王树庆(1983-),男,高级工程师,从事兴蒙造山带地质调查与研究工作.ORCID:0000-0002-4973-7535. E-mail:89617984@qq.com

    • 中图分类号: P597

    Geochronology and Petrogenesis of Late Carboniferous Alkaline Granites from Erlian-Dongwuqi Region, and Its Geological Significance

    • 摘要: 内蒙古二连-东乌旗地区发育一条晚古生代碱性花岗岩带,代表贺根山洋盆闭合后的伸展背景.本次工作在苏尼特左旗北部红格尔(302±1 Ma)、祖横得楞(~299 Ma)、那仁宝力格(301.7±1.4 Ma)等地区新识别出了晚石炭世碱性花岗岩.野外露头及镜下观察可见其中有钠铁闪石和霓辉石等典型碱性暗色矿物;全岩地球化学分析表明具有高SiO2(73.15%~77.38%)、高碱(K2O=4.28%~5.35%,Na2O=4.01%~4.79%)、贫CaO、MgO、FeOt,相对富FeOt(FeOt/MgO为8.2~46.1)等特征,属于弱过铝质系列(A/CNK范围为0.81~1.06,平均为0.97);富集Rb、Th、U、K等大离子亲石元素及Zr、Hf等高场强元素,弱亏损Nb、Ta,强烈亏损Ba、Sr、P、Ti;轻稀土略富集,具有明显负Eu异常(δEu=0.03~0.50),显示“海鸥”型稀土配分模式.岩石学和地球化学分析显示本区晚石炭世碱性花岗岩属于碱质A型花岗岩.同位素分析显示具有亏损的Hf-Nd同位素组成,εHft)和εNdt)均为正值,Hf地壳存留模式年龄范围为345~833 Ma(集中于400~600 Ma),二阶段Nd模式年龄范围为396~806 Ma,表明源岩为幔源新生地壳,代表了新元古-早古生代地壳增生.结合区域地质资料表明,二连-东乌旗旗地区晚石炭世碱性花岗岩是由新生基性下地壳在晚石炭世贺根山洋盆闭合后伸展背景下,在上涌软流圈的加热及减压作用下部分熔融形成的,指示贺根山洋盆至少在300 Ma就已封闭.

       

    • 图  1  二连-东乌旗地区碱性花岗岩分布简图

      a.侵入岩简图,其中角图据Xiao et al.(2018);b,c据河南省地质矿产勘查开发局第一地质矿产调查院, 2015, 1∶50 000阿尔善布拉格幅(L49E022023)地质图;天津市地质调查研究院, 2015, 1∶50 000青格勒宝力格公社幅(L50E020002)地质图;岩体时代见参考文献.碱性花岗岩体名称:1.红格尔;2.赛音乌苏;3.宝拉格;4.白音乌拉;5.祖横得楞;6.那仁宝力格;7.京格斯台;8.扎拉嘎

      Fig.  1.  Alkaline granite distribution sketch of Erlian-Dongwuqi area, Inner Mongolia

      图  2  样品野外及镜下照片

      a,b.祖横得楞(13NM-5);c,d.那仁宝力格(13NM17);e,f.红格尔(14SZ31). 矿物代号:Kf.钾长石;Q.石英;Arf.钠铁闪石;Aug.霓辉石;Pth.条纹长石

      Fig.  2.  Field and Microscope photographs of samples

      图  3  内蒙古二连-东乌旗地区碱性花岗岩锆石U-Pb测年谐和图及代表性锆石阴极发光图

      Fig.  3.  Concordia diagrams and cathodoluminescence images for zircon U-Pb dating of Erlian-Dongwuqi Late Carboniferous alkaline granites, Inner Mongolia

      图  4  二连-东乌旗晚石炭世碱性花岗岩SiO2-FeOt/(FeOt+MgO)(a)和A/CNK-A/NK(b)图解

      图a据Frost et al., 2001;图b据Maniar and Piccoli, 1989

      Fig.  4.  SiO2-FeOt/(FeOt+MgO) (a) and A/CNK-A/NK (b) diagrams of Erlian-Dongwuqi Late Carboniferous alkaline granites

      图  5  二连-东乌旗晚石炭世碱性花岗岩原始地幔标准化微量元素蛛网图和稀土配分模式(原始地幔标准化数据据Sun and McDonough, 1989)

      Fig.  5.  Primitive mantle-normalized trace element spider diagrams and chondrite-normalized REE patterns diagrams of Erlian-Dongwuqi Late Carboniferous alkaline granites (after Sun and McDonough, 1989)

      图  6  二连-东乌旗地区晚石炭世碱性花岗岩分类判别图解

      Whalen et al., 1987, 阴影区域为270~290 Ma碱性花岗岩,数据来自Zhang et al.(2015)Tong et al.(2015)

      Fig.  6.  Classification diagrams of Erlian-Dongwuqi Late Carboniferous alkaline granites, Inner Mongolia

      图  7  二连-东乌旗地区晚石炭世碱性花岗岩εNd(t)-年龄(a)和εHf(t)-时间(b)图解

      图a数据来源:270~290 Ma碱性花岗岩数据据Zhang et al.(2015)Tong et al.(2015),贺根山蛇绿岩据Miao et al.(2008),晚石炭花岗岩据Wei et al.(2018)和作者未发表数据. 图b兴蒙造山带东段Hf同位素组成据Yang et al.(2006),270~290 Ma碱性花岗岩数据据Zhang et al.(2015)Tong et al.(2015),京格斯台碱性花岗岩据王树庆等(2017)

      Fig.  7.  εNd(t) vs. age (a) and εHf(t) vs. time (b) diagrams of Erlian-Dongwuqi Late Carboniferous

      图  8  二连-东乌旗地区晚石炭世碱性花岗岩分类图解

      底图据Eby,1992;灰色点为270~290 Ma碱性花岗岩,数据来源据Zhang et al.(2015)Tong et al.(2015).图例同图 6

      Fig.  8.  Discrimination diagrams of Erlian-Dongwuqi Late Carboniferous alkaline granites

      图  9  二连-东乌旗地区晚石炭世碱性花岗岩R1-R2图解

      Batchelor and Bowden(1985),阴影部分为270~290 Ma碱性花岗岩,数据来自Zhang et al.(2015)Tong et al.(2015)

      Fig.  9.  R1-R2 diagram of Erlian-Dongwuqi Late Carboniferous alkaline granites

      图  10  内蒙古二连-东乌旗地区晚古生代构造模式

      Fig.  10.  Simplified tectonic evolution model in Erlian-Dongwuqi region

      表  1  二连-东乌旗地区晚石炭世碱性花岗岩锆石U-Pb测年分析结果

      Table  1.   Zircon LA-MC-ICPMS U-Pb dating data of Erlian-Dongwuqi Late Carboniferous alkaline granites, Inner Mongolia

      点号 含量(10-6) Th/U 同位素比值 年龄(Ma)
      Pb U Th 206Pb/238U 207Pb/235U 206Pb/238U 207Pb/235U
      13NM5
      1 35 600 943 1.57 0.046 8 0.000 3 0.339 7 0.004 0 295 2 297 3
      2 50 1 068 444 0.42 0.046 9 0.000 3 0.338 4 0.003 1 295 2 296 3
      3 42 812 323 0.40 0.051 7 0.000 3 0.378 3 0.003 9 325 2 326 3
      4 14 304 38 0.13 0.048 3 0.000 3 0.350 3 0.006 5 304 2 305 6
      5 15 327 115 0.35 0.047 8 0.000 3 0.344 3 0.006 2 301 2 300 5
      6 444 1 284 712 0.55 0.140 9 0.001 7 11.424 1 0.196 6 850 10 2 558 44
      7 57 1 277 139 0.11 0.047 8 0.000 3 0.343 4 0.003 2 301 2 300 3
      8 12 276 12 0.04 0.046 9 0.000 3 0.341 8 0.007 8 295 2 299 7
      9 45 1 019 100 0.10 0.047 0 0.000 3 0.344 3 0.003 4 296 2 300 3
      10 7 153 10 0.06 0.047 5 0.000 3 0.348 7 0.013 2 299 2 304 12
      11 48 1 081 102 0.09 0.047 1 0.000 3 0.339 0 0.003 1 297 2 296 3
      12 26 558 167 0.30 0.047 4 0.000 3 0.344 6 0.004 9 299 2 301 4
      13 9 204 13 0.06 0.047 0 0.000 3 0.337 6 0.012 0 296 2 295 10
      14 37 762 672 0.88 0.046 7 0.000 3 0.612 2 0.004 9 294 2 485 4
      15 41 903 126 0.14 0.047 4 0.000 3 0.343 2 0.003 4 299 2 300 3
      16 43 754 1 170 1.55 0.044 5 0.000 5 0.537 3 0.007 9 281 3 437 6
      17 10 230 13 0.06 0.048 0 0.000 3 0.352 5 0.004 5 302 2 307 4
      18 63 1 402 156 0.11 0.047 5 0.000 3 0.342 9 0.002 9 299 2 299 3
      19 25 529 159 0.30 0.049 2 0.000 3 0.353 5 0.005 0 309 2 307 4
      20 12 272 45 0.16 0.047 7 0.000 3 0.346 3 0.007 5 300 2 302 7
      21 24 486 282 0.58 0.046 6 0.000 3 0.336 0 0.004 8 294 2 294 4
      22 37 790 179 0.23 0.047 4 0.000 3 0.3433 0.004 4 299 2 300 4
      23 9 110 276 2.52 0.047 9 0.000 4 0.348 8 0.020 7 302 2 304 18
      24 9 193 5 0.03 0.048 2 0.000 3 0.349 9 0.010 7 303 2 305 9
      25 22 467 45 0.10 0.049 3 0.000 3 0.355 6 0.003 1 310 2 309 3
      26 20 456 20 0.04 0.047 6 0.000 3 0.342 4 0.004 6 300 2 299 4
      27 35 731 178 0.24 0.047 8 0.000 3 0.344 7 0.003 4 301 2 301 3
      28 34 766 48 0.06 0.047 7 0.000 6 0.343 9 0.018 9 300 4 300 16
      29 15 319 77 0.24 0.047 0 0.000 3 0.339 4 0.005 7 296 2 297 5
      30 60 1 271 210 0.17 0.048 6 0.000 4 0.565 9 0.009 0 306 3 455 7
      31 6 128 11 0.08 0.047 6 0.000 3 0.343 3 0.013 8 300 2 300 12
      32 15 335 58 0.17 0.047 4 0.000 3 0.348 3 0.005 7 299 2 303 5
      33 17 377 71 0.19 0.047 2 0.000 3 0.346 0 0.005 5 298 2 302 5
      34 18 336 184 0.55 0.048 1 0.000 3 0.350 6 0.006 0 303 2 305 5
      35 19 435 19 0.04 0.047 3 0.000 3 0.344 5 0.004 9 298 2 301 4
      36 28 565 142 0.25 0.049 6 0.000 3 0.618 5 0.007 8 312 2 489 6
      37 37 826 56 0.07 0.047 5 0.000 3 0.346 0 0.003 4 299 2 302 3
      38 14 295 94 0.32 0.048 0 0.000 3 0.351 6 0.009 8 302 2 306 9
      13NM12
      1 14 273 230 0.84 0.044 6 0.000 4 0.806 6 0.010 7 281 2 601 8
      2 10 173 171 0.99 0.048 7 0.000 3 0.351 4 0.007 0 306 2 306 6
      3 9 172 154 0.90 0.048 2 0.000 3 0.350 8 0.011 5 303 2 305 10
      4 5 93 66 0.71 0.047 2 0.000 4 0.341 5 0.013 1 297 2 298 11
      5 11 203 184 0.91 0.047 0 0.000 3 0.342 2 0.006 0 296 2 299 5
      13NM12
      6 9 154 187 1.21 0.047 2 0.000 4 0.342 9 0.008 9 298 2 299 8
      7 19 307 437 1.42 0.048 0 0.000 3 0.347 7 0.006 6 302 2 303 6
      8 11 198 227 1.15 0.047 7 0.000 4 0.350 1 0.006 8 300 2 305 6
      9 14 234 368 1.57 0.047 0 0.000 4 0.340 9 0.005 5 296 2 298 5
      10 8 148 155 1.05 0.047 4 0.000 4 0.349 5 0.008 3 299 2 304 7
      11 11 177 258 1.46 0.047 5 0.000 4 0.342 1 0.007 5 299 2 299 7
      12 12 250 79 0.32 0.047 4 0.000 4 0.341 5 0.006 7 298 2 298 6
      13 6 110 149 1.35 0.047 0 0.000 4 0.343 7 0.011 9 296 2 300 10
      14 36 575 1 316 2.29 0.044 4 0.000 3 0.364 8 0.006 7 280 2 316 6
      15 24 437 27 0.06 0.055 0 0.000 4 1.227 6 0.025 5 345 3 813 17
      16 12 202 269 1.33 0.047 1 0.000 3 0.339 3 0.007 2 296 2 297 6
      17 33 520 1 010 1.94 0.046 8 0.000 3 0.338 2 0.003 4 295 2 296 3
      18 16 285 324 1.14 0.047 2 0.000 3 0.345 7 0.005 4 298 2 301 5
      19 11 210 201 0.96 0.047 3 0.000 3 0.346 4 0.008 2 298 2 302 7
      20 10 188 170 0.90 0.047 1 0.000 3 0.339 1 0.008 6 296 2 296 8
      21 17 268 425 1.59 0.047 5 0.000 7 0.346 3 0.025 5 299 4 302 22
      22 25 382 574 1.50 0.047 5 0.000 3 0.343 9 0.004 3 299 2 300 4
      23 10 178 151 0.85 0.046 8 0.000 3 0.343 4 0.007 5 295 2 300 7
      24 13 215 241 1.12 0.047 1 0.000 3 0.343 3 0.008 3 297 2 300 7
      25 17 291 279 0.96 0.047 1 0.000 3 0.340 3 0.006 1 296 2 297 5
      13NM15
      1 11 197 197 1.00 0.047 4 0.000 3 0.343 9 0.009 2 299 2 300 8
      2 14 246 249 1.01 0.047 2 0.000 3 0.345 8 0.008 0 297 2 302 7
      3 8 152 95 0.63 0.047 8 0.000 3 0.348 3 0.008 6 301 2 303 8
      4 8 155 116 0.75 0.047 6 0.000 4 0.343 8 0.011 8 300 2 300 10
      5 17 310 227 0.73 0.048 7 0.000 3 0.350 9 0.005 3 307 2 305 5
      6 8 151 119 0.78 0.047 9 0.000 3 0.346 4 0.007 8 302 2 302 7
      7 9 162 124 0.77 0.046 7 0.000 5 0.339 8 0.028 9 294 3 297 25
      8 7 137 87 0.64 0.047 6 0.000 3 0.348 7 0.012 8 300 2 304 11
      9 12 212 197 0.93 0.048 9 0.000 3 0.355 9 0.004 4 308 2 309 4
      10 10 178 154 0.87 0.048 1 0.000 3 0.348 2 0.006 8 303 2 303 6
      11 6 110 86 0.78 0.046 9 0.000 5 0.341 5 0.028 0 295 3 298 24
      12 11 196 150 0.76 0.048 3 0.000 3 0.349 1 0.006 5 304 2 304 6
      13 9 175 111 0.64 0.047 7 0.000 3 0.346 5 0.009 0 300 2 302 8
      14 9 168 125 0.74 0.048 3 0.000 3 0.352 3 0.007 7 304 2 306 7
      15 6 124 39 0.32 0.049 3 0.000 3 0.358 6 0.010 7 310 2 311 9
      16 9 157 126 0.80 0.047 6 0.000 3 0.343 7 0.010 1 300 2 300 9
      17 14 258 186 0.72 0.047 5 0.000 3 0.344 9 0.005 1 299 2 301 4
      18 7 140 9 0.06 0.049 3 0.000 3 0.733 8 0.021 5 310 2 559 16
      19 8 148 90 0.61 0.047 1 0.000 3 0.340 4 0.011 0 297 2 297 10
      20 13 237 178 0.75 0.047 5 0.000 3 0.347 1 0.004 6 299 2 303 4
      21 11 193 202 1.04 0.047 0 0.000 3 0.341 2 0.009 9 296 2 298 9
      22 11 194 203 1.05 0.047 1 0.000 3 0.343 8 0.008 3 297 2 300 7
      23 9 173 162 0.93 0.047 3 0.000 3 0.345 8 0.005 2 298 2 302 5
      24 10 182 145 0.80 0.047 0 0.000 3 0.337 7 0.008 1 296 2 295 7
      13NM15
      25 11 210 152 0.72 0.046 8 0.000 3 0.337 2 0.009 4 295 2 295 8
      26 12 230 216 0.94 0.046 7 0.000 3 0.339 4 0.009 6 294 2 297 8
      13NM17
      1 10 194 122 0.63 0.047 6 0.000 3 0.346 4 0.006 9 300 2 302 6
      2 11 189 151 0.80 0.047 7 0.000 3 0.349 2 0.007 2 301 2 304 6
      3 10 187 102 0.54 0.048 3 0.000 3 0.348 9 0.007 5 304 2 304 7
      4 3 58 37 0.64 0.047 8 0.000 4 0.345 5 0.025 0 301 2 301 22
      5 15 269 205 0.76 0.047 8 0.000 3 0.349 4 0.005 1 301 2 304 4
      6 18 308 261 0.85 0.049 5 0.000 3 0.358 6 0.004 1 311 2 311 4
      7 3 63 22 0.36 0.048 6 0.000 4 0.350 8 0.021 3 306 2 305 19
      8 2 42 25 0.59 0.048 9 0.000 4 0.355 8 0.023 4 308 3 309 20
      9 11 198 123 0.62 0.047 5 0.000 3 0.343 9 0.008 3 299 2 300 7
      10 4 71 38 0.54 0.047 8 0.000 3 0.347 3 0.017 5 301 2 303 15
      11 10 183 118 0.65 0.048 2 0.000 3 0.349 6 0.009 4 303 2 304 8
      12 14 251 191 0.76 0.048 9 0.000 3 0.351 8 0.004 9 308 2 306 4
      13 20 367 303 0.82 0.047 6 0.000 3 0.344 5 0.004 5 300 2 301 4
      14 11 210 147 0.70 0.048 1 0.000 3 0.351 2 0.007 1 303 2 306 6
      15 9 173 112 0.65 0.048 5 0.000 3 0.348 4 0.008 8 306 2 304 8
      16 12 235 136 0.58 0.047 7 0.000 3 0.347 6 0.005 8 300 2 303 5
      17 4 92 29 0.32 0.047 6 0.000 3 0.348 5 0.011 1 300 2 304 10
      18 19 361 299 0.83 0.048 1 0.000 5 0.350 0 0.009 3 303 3 305 8
      19 19 344 352 1.02 0.048 1 0.000 3 0.349 4 0.004 3 303 2 304 4
      20 7 155 10 0.06 0.048 0 0.000 3 0.352 0 0.009 9 302 2 306 9
      21 14 272 229 0.84 0.047 9 0.000 3 0.347 7 0.006 1 302 2 303 5
      22 19 349 305 0.87 0.048 2 0.000 3 0.352 1 0.004 6 303 2 306 4
      23 7 128 99 0.78 0.046 9 0.000 3 0.340 1 0.012 2 295 2 297 11
      24 6 111 75 0.67 0.048 2 0.000 3 0.350 7 0.016 4 304 2 305 14
      25 5 83 75 0.90 0.047 7 0.000 4 0.344 1 0.021 8 300 2 300 19
      26 5 94 65 0.69 0.047 0 0.000 3 0.343 2 0.018 1 296 2 300 16
      27 3 54 24 0.45 0.047 7 0.000 4 0.347 9 0.029 3 300 2 303 26
      28 6 121 58 0.48 0.047 6 0.000 3 0.345 0 0.011 2 300 2 301 10
      29 3 62 27 0.44 0.047 9 0.000 4 0.346 6 0.020 2 302 2 302 18
      下载: 导出CSV

      表  2  二连-东乌旗地区晚石炭世碱性花岗岩主微量元素分析结果

      Table  2.   Major(%) and trace element (10-6) data of Erlian-Dongwuqi Late Carboniferous alkaline granites

      送样号 14SZ31 14SZ32 14SZ33 14SZ37 14SZ38 P12YQ5* P14YQ4* P14YQ6* YQ4673-1-2* YQ5709-1-2* YQ4721-1-2* YQ4765-1-2* YQ4627-1-2*
      红格尔
      SiO2 74.29 74.61 74.80 76.39 75.96 73.89 74.61 74.79 75.15 75.79 74.71 75.58 74.60
      TiO2 0.19 0.14 0.15 0.06 0.06 0.19 0.17 0.18 0.19 0.16 0.19 0.14 0.20
      Al2O3 13.06 13.53 12.91 12.86 12.76 12.76 12.44 12.94 12.24 11.97 12.74 12.31 12.41
      Fe2O3 1.69 1.60 1.82 1.24 1.13 1.41 1.46 1.10 1.24 1.14 1.31 1.17 1.16
      FeO 0.57 0.11 0.31 0.12 0.18 1.17 0.93 0.57 1.05 1.01 0.93 0.79 1.15
      FeOT 2.09 1.55 1.95 1.24 1.20 2.44 2.24 1.56 2.17 2.04 2.11 1.84 2.19
      MnO 0.06 0.03 0.04 0.02 0.02 0.08 0.07 0.04 0.07 0.07 0.06 0.05 0.07
      MgO 0.12 0.12 0.13 0.07 0.10 0.08 0.08 0.06 0.06 0.05 0.07 0.04 0.06
      CaO 0.25 0.28 0.29 0.08 0.43 0.27 0.36 0.28 0.24 0.28 0.26 0.27 0.42
      Na2O 4.38 4.15 4.01 4.28 4.36 4.27 4.32 4.30 4.05 4.20 4.50 4.26 4.26
      K2O 4.99 5.03 5.03 4.54 4.54 5.05 4.91 5.13 4.96 4.58 4.76 4.84 4.87
      P2O5 0.08 0.08 0.06 0.02 0.01 0.11 0.04 0.02 0.14 0.1 0.03 0.02 0.03
      LOI 0.26 0.31 0.41 0.31 0.43 0.64 0.51 0.51 0.53 0.58 0.39 0.47 0.69
      V 3.67 2.19 18.30 2.88 4.83 10.20 10.00 8.50 9.50 9.30 13.50 11.00 8.80
      Cr 1.84 1.28 3.23 2.11 1.73 21.00 20.30 21.10 3.70 4.20 6.50 4.20 3.80
      Co 0.28 0.38 0.57 0.24 0.23 0.74 0.70 0.57 1.10 1.00 0.50 0.50 0.40
      Ni 0.76 0.71 2.23 1.24 1.15 8.90 8.20 9.00 1.80 2.00 1.20 2.90 1.50
      Ga 22.00 17.80 20.00 18.80 23.40 29.60 28.40 30.10 25.47 25.32 26.32 26.56 25.04
      Cs 6.67 44.30 4.26 28.00 22.70 6.65 7.47 3.56 9.87 7.94 5.54 8.58 5.06
      Rb 267.00 300.00 182.00 406.00 481.00 241.20 289.20 210.80 213.70 211.90 230.50 224.30 202.00
      Ba 65.30 24.10 72.30 18.70 32.50 162.70 155.50 86.20 97.70 208.60 129.80 87.40 82.70
      Th 37.50 28.90 13.20 15.90 20.40 32.42 21.96 21.13 21.37 19.27 25.46 27.00 27.87
      U 5.25 5.72 2.20 2.13 2.15 4.50 2.22 3.72 3.16 3.40 2.52 3.32 4.46
      Nb 60.30 34.50 10.80 23.90 35.80 58.15 37.70 40.36 35.73 33.05 35.96 37.14 35.96
      Ta 6.41 2.96 0.78 2.62 2.99 4.57 2.43 3.12 2.21 2.04 3.36 3.27 3.02
      La 24.50 18.70 37.00 8.50 16.70 47.92 84.71 43.52 43.31 88.22 19.00 25.77 49.10
      Ce 176.00 62.80 98.80 21.20 38.20 105.60 140.50 85.35 131.00 241.90 85.58 89.78 125.00
      Pr 9.57 8.52 15.10 3.21 6.01 16.96 24.38 11.26 14.88 23.27 6.28 8.82 14.72
      Sr 20.00 19.00 23.00 14.00 15.00 18.00 15.80 11.10 17.20 27.10 20.30 13.80 14.90
      Nd 35.90 29.90 57.50 10.70 22.30 59.70 89.47 41.04 52.04 83.45 22.57 32.74 52.23
      Zr 1 030.00 268.00 260.00 205.00 204.00 592.50 574.30 531.50 543.30 444.10 470.30 511.70 610.70
      Hf 20.90 10.60 7.27 9.42 9.64 30.44 28.60 29.57 23.64 18.29 22.38 22.78 27.54
      Sm 7.67 6.92 11.00 2.12 5.56 12.41 18.72 9.17 10.14 15.71 5.07 7.06 10.81
      Eu 0.16 0.18 0.23 0.02 0.05 0.44 0.42 0.82 0.37 0.55 0.22 0.30 0.33
      Gd 7.60 6.88 9.97 1.80 5.58 9.07 13.98 7.54 7.92 12.11 4.53 5.86 9.76
      Tb 1.36 1.38 1.61 0.28 1.11 1.79 2.52 1.50 1.54 2.15 1.01 1.21 2.04
      Dy 8.77 9.09 9.31 1.63 7.16 12.81 16.19 10.16 10.69 13.32 7.40 8.39 14.30
      Y 46.00 52.00 44.40 7.04 41.40 63.13 67.54 52.45 57.55 66.65 41.20 47.50 81.06
      Ho 1.83 1.87 1.82 0.32 1.51 2.76 3.20 2.17 2.22 2.67 1.66 1.74 3.07
      Er 5.66 5.69 5.09 0.99 4.65 8.17 8.60 6.44 6.51 7.31 5.06 5.02 8.78
      Tm 0.85 0.86 0.71 0.16 0.76 1.68 1.62 1.27 1.17 1.30 1.03 0.96 1.55
      Yb 5.58 5.96 4.01 1.01 4.80 11.49 11.14 8.71 8.05 8.75 7.49 7.16 10.69
      Lu 0.84 0.89 0.56 0.15 0.69 1.41 1.31 1.13 1.33 1.39 1.25 1.33 1.78
      104Ga/ Al 3.18 2.49 2.93 2.76 3.46 4.38 4.31 4.39 3.93 4.00 3.90 4.08 3.81
      A/CNK 1.00 1.06 1.03 1.06 0.99 0.98 0.95 0.99 0.98 0.97 0.98 0.97 0.95
      Eu* 0.06 0.08 0.07 0.03 0.03 0.13 0.08 0.30 0.13 0.12 0.14 0.14 0.10
      TZr 973 837 831 814 806 908 901 897 901 879 883 893 908
      送样号 YQ4965-1-2* YQ5728-1-2* YQ4918-1-2* 13NM-5 13NM-7 13NM12 13NM15 13NM17 P17YQ1** P17YQ2** P17YQ3** P17YQ4** P17YQ5**
      红格尔 祖横得楞 那仁宝力格
      SiO2 75.43 74.92 74.72 76.29 75.41 77.38 73.15 75.76 76.94 76.36 76.22 76.75 76.58
      TiO2 0.15 0.21 0.20 0.22 0.25 0.22 0.35 0.20 0.12 0.14 0.13 0.12 0.13
      Al2O3 12.67 12.43 12.63 9.86 12.39 11.28 13.39 12.09 11.45 11.71 11.85 11.78 11.77
      Fe2O3 0.94 1.25 1.28 3.33 1.66 1.55 1.81 1.45 1.12 1.05 0.89 0.73 0.85
      FeO 0.65 1.05 0.92 0.26 0.17 0.14 0.26 0.65 0.72 0.95 0.84 0.88 0.69
      FeOt 1.50 2.17 2.07 3.26 1.66 1.54 1.89 1.95 1.73 1.89 1.64 1.54 1.45
      MnO 0.04 0.06 0.07 0.15 0.09 0.06 0.09 0.09 0.04 0.06 0.05 0.04 0.04
      MgO 0.04 0.05 0.08 0.14 0.14 0.11 0.23 0.10 0.10 0.08 0.06 0.06 0.07
      CaO 0.27 0.29 0.29 0.33 0.24 0.18 0.29 0.16 0.18 0.21 0.22 0.16 0.24
      Na2O 4.36 4.20 4.28 4.21 4.36 4.01 4.78 4.79 4.07 4.15 4.38 4.19 4.25
      K2O 4.94 5.00 5.01 4.33 4.83 4.40 5.35 4.28 4.60 4.62 4.71 4.76 4.70
      P2O5 0.03 0.04 0.03 0.04 0.07 0.03 0.05 0.02 0.01 0.01 0.01 0.01 0.01
      LOI 0.43 0.43 0.41 0.63 0.30 0.56 0.19 0.31 0.44 0.45 0.42 0.29 0.47
      V 10.50 9.50 9.90 21.05 23.61 22.33 26.36 24.91 14.50 12.20 13.20 9.10 13.40
      Cr 4.20 4.10 4.80 2.80 3.68 3.62 3.57 3.72 2.60 2.50 2.60 2.40 2.90
      Co 0.50 0.30 0.50 0.52 0.77 0.73 0.37 0.68 0.60 0.60 0.40 0.20 0.40
      Ni 1.20 1.00 1.70 1.77 3.33 2.04 0.73 1.39 1.70 1.30 1.30 0.90 1.50
      Ga 28.12 23.79 25.93 25.77 24.35 22.14 25.28 23.31 21.85 22.19 23.20 20.89 22.61
      Cs 9.28 4.34 4.16 1.66 2.60 3.58 1.27 0.56 2.66 3.24 4.57 3.18 4.56
      Rb 265.20 174.90 189.60 229.46 122.21 122.10 104.06 64.35 105.10 113.20 117.80 114.50 115.70
      Ba 118.70 92.50 101.80 87.54 85.60 166.08 123.84 144.96 28.00 34.40 38.20 16.30 29.70
      Th 42.63 33.78 20.54 35.80 11.88 16.96 8.67 5.30 10.65 11.76 9.44 8.14 8.46
      U 6.00 3.03 2.27 3.47 1.61 1.55 0.82 1.14 1.04 1.68 0.98 0.79 0.97
      Nb 48.59 34.55 30.58 31.12 21.54 17.65 16.06 20.85 18.13 24.10 22.01 15.66 21.06
      Ta 4.57 2.48 1.86 2.29 1.19 1.02 0.86 1.15 1.20 1.66 0.90 0.77 0.94
      La 29.51 31.13 35.40 50.29 31.75 37.40 46.22 46.47 13.49 8.76 14.50 17.32 14.15
      Ce 80.68 147.30 69.76 113.19 69.20 78.71 103.47 101.19 32.57 68.45 39.69 43.20 33.18
      Pr 9.57 10.49 9.74 14.83 8.90 11.08 14.68 12.93 4.55 3.36 4.72 5.13 4.19
      Sr 17.00 13.80 14.20 10.20 14.23 14.14 10.35 9.63 5.60 5.90 7.30 3.80 6.10
      Nd 36.08 36.74 36.05 57.20 34.10 44.25 58.61 48.65 19.11 13.30 18.35 19.50 16.52
      Zr 388.00 578.50 546.10 1 225.72 533.67 425.80 364.28 574.44 382.00 475.80 403.70 376.00 370.60
      Hf 20.20 26.91 24.16 29.62 15.17 11.80 12.29 14.43 15.41 18.29 14.45 13.90 13.74
      Sm 8.48 7.89 7.45 14.25 7.58 10.88 12.18 10.23 5.19 4.23 4.92 4.77 4.11
      Eu 0.24 0.23 0.20 2.00 0.80 1.75 1.74 1.17 0.19 0.10 0.13 0.11 0.11
      Gd 7.70 6.89 6.38 15.23 7.74 10.41 10.52 9.76 4.94 4.46 4.87 4.57 4.07
      Tb 1.66 1.41 1.29 3.21 1.50 2.02 1.84 1.76 1.09 1.05 1.08 0.97 0.91
      Dy 11.40 9.33 8.31 21.01 9.81 12.53 10.42 10.78 7.34 7.28 7.31 6.51 6.45
      Y 54.96 47.72 43.07 122.00 59.48 83.39 53.15 62.28 43.50 42.90 45.96 37.00 41.77
      Ho 2.26 1.96 1.73 4.09 1.89 2.31 1.83 2.00 1.50 1.50 1.53 1.31 1.35
      Er 6.43 5.64 4.86 13.19 5.91 7.31 5.33 6.37 4.76 4.55 4.51 4.02 4.07
      Tm 1.16 1.03 0.85 2.42 1.03 1.24 0.81 1.12 0.81 0.82 0.77 0.72 0.70
      Yb 8.22 7.25 5.86 16.48 7.13 7.86 5.15 7.40 6.12 6.06 5.47 5.38 4.89
      Lu 1.40 1.20 0.94 3.05 1.33 1.29 0.83 1.53 1.12 1.16 0.99 0.97 0.89
      104Ga/Al 4.19 3.62 3.88 4.94 3.71 3.71 3.57 3.64 3.60 3.58 3.70 3.35 3.63
      A/CNK 0.97 0.97 0.97 0.81 0.97 0.97 0.94 0.94 0.95 0.96 0.93 0.95 0.94
      Eu* 0.09 0.10 0.09 0.41 0.32 0.50 0.47 0.36 0.11 0.07 0.08 0.07 0.08
      TZr 864 905 899 967 896 877 850 902 864 886 865 861 858
        注:数据来源:*内蒙古1∶5万达如嘎呼都格等六幅区域地质调查报告;**内蒙古1∶5万翁根温多尔等六幅区域地质调查报告.
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      表  3  二连-东乌旗地区晚石炭世碱性花岗岩锆石Hf同位素组成

      Table  3.   Hf isotopic compositions for zircons of Late Carboniferous alkaline granites from Erlian-Dongwuqi region

      分析点 t (Ma) 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 176Hf/177Hfi εHf(t) TDMC (Ma) fLu/Hf
      13NM5.1 299 0.264 280 0.003 486 0.283 031 0.000 023 0.283 012 15.1 375 -0.89
      13NM5.2 299 0.025 209 0.000 539 0.283 003 0.000 016 0.283 000 14.6 414 -0.98
      13NM5.9 299 0.021 086 0.000 433 0.283 002 0.000 015 0.282 999 14.6 415 -0.99
      13NM5.13 299 0.033 421 0.000 829 0.283 013 0.000 017 0.283 008 14.9 387 -0.98
      13NM5.14 299 0.014 886 0.000 340 0.282 991 0.000 012 0.282 989 14.3 447 -0.99
      13NM5.15 299 0.031 468 0.000 658 0.282 962 0.000 011 0.282 958 13.2 547 -0.98
      13NM5.16 299 0.011 837 0.000 264 0.283 009 0.000 013 0.283 007 14.9 390 -0.99
      13NM5.19 299 0.041 749 0.000 824 0.282 996 0.000 017 0.282 992 14.3 440 -0.98
      13NM5.21 299 0.013 464 0.000 307 0.283 023 0.000 013 0.283 021 15.4 345 -0.99
      13NM5.22 299 0.025 084 0.000 528 0.282 984 0.000 015 0.282 981 14.0 473 -0.98
      13NM5.23 299 0.072 231 0.001 303 0.283 013 0.000 020 0.283 005 14.8 396 -0.96
      13NM5.25 299 0.247 189 0.004 442 0.283 041 0.000 048 0.283 016 15.2 361 -0.87
      13NM5.26 299 0.027 325 0.000 578 0.282 983 0.000 016 0.282 980 13.9 479 -0.98
      13NM5.27 299 0.035 935 0.000 686 0.282 929 0.000 017 0.282 925 12.0 655 -0.98
      13NM5.29 299 0.031 241 0.000 477 0.283 001 0.000 016 0.282 999 14.6 418 -0.99
      13NM5.31 299 0.333 987 0.004 337 0.282 915 0.000 034 0.282 891 10.8 764 -0.87
      13NM5.32 299 0.048 377 0.000 787 0.282 954 0.000 021 0.282 950 12.9 576 -0.98
      13NM5.38 299 0.015557 0.000 237 0.282 960 0.000 020 0.282 959 13.2 545 -0.99
      13NM5.40 299 0.016 769 0.000 360 0.282 955 0.000 015 0.282 953 13.0 564 -0.99
      13NM12.1 297 0.204 046 0.004 168 0.283 014 0.000 026 0.282 990 14.3 446 -0.87
      13NM12.2 297 0.203 691 0.004 253 0.282 976 0.000 027 0.282 953 12.9 568 -0.87
      13NM12.3 297 0.163 312 0.003 622 0.282 989 0.000 023 0.282 969 13.5 515 -0.89
      13NM12.5 297 0.151 281 0.003 595 0.282 960 0.000 025 0.282 940 12.5 609 -0.89
      13NM12.8 297 0.123 949 0.002 917 0.282 969 0.000 023 0.282 953 12.9 569 -0.91
      13NM12.10 297 0.173 087 0.004 650 0.282 978 0.000 022 0.282 952 12.9 571 -0.86
      13NM12.11 297 0.161 938 0.003 684 0.282 904 0.000 025 0.282 883 10.5 792 -0.89
      13NM12.13 297 0.178 470 0.004 711 0.283 041 0.000 021 0.283 014 15.1 369 -0.86
      13NM12.14 297 0.125 040 0.003 083 0.282 997 0.000 027 0.282 979 13.9 482 -0.91
      13NM12.17 297 0.154 522 0.004 236 0.282 894 0.000 022 0.282 870 10.0 833 -0.87
      13NM12.21 297 0.133 204 0.003 394 0.282 978 0.000 029 0.282 959 13.2 547 -0.90
      13NM12.22 297 0.168 386 0.004 348 0.283 033 0.000 031 0.283 008 14.9 389 -0.87
      13NM12.26 297 0.218 615 0.004 949 0.282 914 0.000 042 0.282 886 10.6 783 -0.85
      13NM15.8 299 0.139 022 0.003 144 0.282 985 0.000 025 0.282 967 13.5 519 -0.91
      13NM15.13 299 0.166 716 0.004 284 0.282 958 0.000 024 0.282 935 12.3 624 -0.87
      13NM15.16 299 0.152 383 0.003 568 0.283 011 0.000 027 0.282 991 14.3 441 -0.89
      13NM15.24 299 0.156 382 0.003 593 0.282 955 0.000 025 0.282 935 12.4 622 -0.89
      13NM15.29 299 0.151 167 0.003 833 0.283 035 0.000 029 0.283 013 15.1 370 -0.88
      13NM15.31 299 0.217 345 0.005 831 0.283 003 0.000 027 0.282 970 13.6 510 -0.82
      13NM17.2 302 0.270 771 0.005 613 0.282 854 0.000 036 0.282 822 8.4 782 -0.83
      13NM17.3 302 0.280 976 0.005 665 0.282 985 0.000 036 0.282 953 13.0 485 -0.83
      13NM17.4 302 0.145 798 0.004 265 0.282 964 0.000 031 0.282 939 12.6 515 -0.87
      13NM17.7 302 0.103 037 0.002 381 0.282 882 0.000 023 0.282 869 10.1 676 -0.93
      13NM17.9 302 0.287 090 0.006 648 0.282 849 0.000 033 0.282 811 8.0 806 -0.80
      13NM17.10 302 0.112 713 0.002 459 0.282 983 0.000 022 0.282 969 13.6 447 -0.93
      13NM17.13 302 0.301 077 0.006 241 0.283 027 0.000 035 0.282 992 14.4 396 -0.81
      13NM17.15 302 0.264 664 0.005 522 0.282 996 0.000 034 0.282 965 13.5 457 -0.83
      13NM17.21 302 0.208 791 0.005 230 0.282 954 0.000 030 0.282 924 12.0 550 -0.84
      13NM17.22 302 0.238 405 0.006 420 0.282 960 0.000 027 0.282 924 12.0 550 -0.81
        注:εHf(0)=[(176Hf/177Hf) s/(176Hf/177Hf)CHUR, 0-1]×10 000; εHf(t)={[(176Hf/177Hf)s-/(176Lu/177Hf)s×(eλt-1)]/[ (176Hf/177Hf)CHUR, 0-(176Lu/177Hf)s×(eλt-1)]-1}×10 000; TDM=1/λ×ln{1+ [(176Hf/177Hf)s-(176Hf/177Hf)DM]/[(176Lu/177Hf)s-(176Lu/177Hf)DM]; TDMC=TDM-(TDM-t)×[(fcc-fs)/(fcc-fDM)]; fs= (176Lu/177Hf)s/[(176Lu/177Hf)CHUR-1; 其中(176Lu177Hf)s和(176Hf/177Hf)s为样品测定值,(176Lu/177Hf)CHUR=0.033 2, (176Hf/177Hf)CHUR, 0=0.282 772; (176Lu/177Hf)DM =0.038 4, (176Hf/177Hf)DM =0.283 25. fcc, fs, fDM分别为大陆平均地壳、样品和亏损地幔的fLu/Hf, fcc =-0.55, fDM =0.16. t为样品成岩年龄, λ=1.867×10-11 a-1.
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      表  4  内蒙古祖横得楞碱性花岗岩Nd同位素数据

      Table  4.   Nd isotopic data of Zuhengdeleng alkaline granites, Inner Mongolia

      样品号 t(Ma) Sm(10-6) Nd(10-6) 147Sm/144Nd 143Nd/144Nd (143Nd/144Nd)i εNd(t) TDM2(Ma) fSm/Nd
      13NM5 299 14.25 57.20 0.154 333 0.512 880 0.512 577 6.3 547 -0.22
      13NM12 298 10.88 44.25 0.152 355 0.512 863 0.512 564 6.1 567 -0.23
      13NM15 299 12.18 58.61 0.128 726 0.512 812 0.512 559 6.0 575 -0.35
      13NM17 302 10.23 48.65 0.130 220 0.512 849 0.512 593 6.7 521 -0.34
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