Determination of Late Paleozoic metamorphic event in the Langshan area, western Inner Mongolia: New evidence from LA-ICP-MS zircon U-Pb dating of the Wulashan Group
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摘要:
乌拉山岩群是狼山地区最重要的前寒武纪变质基底之一，准确测定其原岩成岩与变质时代，对于进一步探讨狼山地区前寒武纪地质演化具有重要的意义。对狼山地区乌拉山岩群角闪黑云斜长片麻岩及其伴生的花岗质浅色脉体进行了岩石学和锆石U-Pb年代学研究。碎屑锆石U-Pb定年和野外地质调查表明，狼山地区乌拉山岩群角闪黑云斜长片麻岩碎屑锆石年龄介于2591~1800Ma之间，其中最小一组碎屑锆石年龄为1873Ma，结合其约270Ma的变质年龄，初步限定乌拉山岩群角闪黑云斜长片麻岩的原岩沉积年龄为1873~270Ma。综合新的研究资料，认为狼山地区乌拉山岩群除存在新太古代-古元古代变质岩外，可能还存在中元古代-晚古生代变沉积岩。锆石阴极发光图像与U-Pb定年结果综合表明，角闪黑云斜长片麻岩中发育大量变质锆石，获得的206Pb/238U年龄加权平均值为269±4Ma，代表狼山地区乌拉山岩群遭受晚古生代末期角闪岩相变质作用的时代，可能与华北板块与西伯利亚板块晚古生代末期碰撞造山作用有关。此外，采用预剥蚀方法，在乌拉山岩群高硅花岗质浅色脉体高U锆石中，获得的206Pb/238U年龄加权平均值为264±3Ma，被解释为乌拉山岩群花岗质浅色脉体的形成时代，代表本区晚古生代造山作用由同碰撞挤压向碰撞后伸展转换的时限。
Abstract:Wulashan Group is one of the important parts of the Precambrian basement in the Langshan area, and accurate determination of the diagenetic and metamorphic timing of the Wulashan Group is of great scientific significance for further discussing the Precambrian geological evolution of the Langshan area. In this paper, the authors carried out a detailed study of the petrological observation and zircon U-Pb dating of hornblende biotite plagioclase gneisses and related granitic leucosomes from Wulashan Group. The result of detrital zircon U-Pb dating and geological investigation of the hornblende biotite plagioclase gneisses indicates that the age of detrital zircons of the gneisses of the Wulashan Group in Langshan area ranges from 2591Ma to 1800Ma, and the youngest group age of detrital zircons is circa 1873Ma. Combined with its metamorphic age of circa 270Ma, it is preliminarily considered that the sedimentary age of the gneisses ranges from 1873Ma to 270Ma. The above and latest studies indicate that, besides Neoarchaean-Paleoproterozoic metamorphic rocks, there are also Mesoproterozoic-Late Paleozoic metasedimentary rocks within the Wulashan Group. The result of cathodoluminescence image analysis and U-Pb dating of zircons indicates that a large number of metamorphic zircons exist in the hornblende biotite plagioclase gneisses. They record a 206Pb/238U weighted average age of 269±4Ma, which represents the timing of the late Paleozoic amphibolite-facies metamorphism of the Wulashan Group in the Langshan area, probably in response to the Late Paleozoic collisional orogenesis between the North China Plate and Siberian Plate. In addition, a reliable 206Pb/238U weighted average age of 264±3Ma of the high-U zircons from the high-silica granitic leucosomes was obtained by pre-ablation dating method. The age (264±3Ma) is interpreted as the diagenetic timing of high-silica granitic leucosomes in the Wulashan Group, which represents the timing of the transformation for the collisional extrusion to post-collisional extension during late Paleozoic orogenesis.
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Key words:
- Langshan /
- Wulashan Group /
- Late Paleozoic metamorphic event /
- zircon U-Pb dating
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图 6 乌拉山岩群角闪黑云斜长片麻岩碎屑锆石206Pb/238U-207Pb/235U图（a、b）、年龄直方图（c）及变质锆石206Pb/238U-207Pb/235U图（d）
Figure 6.
表 1 狼山地区乌拉山岩群黑云角闪斜长片麻岩LA-ICP-MS锆石U-Th-Pb定年结果
Table 1. LA-ICP-MS zircons U-Th-Pb analyses from biotite amphibole plagioclase gneiss of the Wulashan Group in the Langshan area
样品点 同位素含量/10-6 Th/U 同位素比值 年龄/Ma Total Pb Common Pb 232Th 238U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb σ 207Pb/235U 1σ 206Pb/238U 1σ 第一组:碎屑锆石: 2591 ± 28~1115 ± 26Ma AZ20-1-1-71 22.44 0.00 15.70 41.97 0.37 0.1735 0.0029 9.6445 0.1847 0.4037 0.0051 2591 28 2401 18 2186 24 AZ20-1-1-65 25.98 22.02 32.05 46.41 0.69 0.1573 0.0022 7.8380 0.1036 0.3627 0.0028 2428 24 2213 12 1995 13 AZ20-1-1-08 61.98 38.11 86.33 188.50 0.46 0.1259 0.0016 4.4638 0.0571 0.2556 0.0016 2043 22 1724 11 1467 8 AZ20-1-1-69 55.03 49.44 89.74 120.17 0.75 0.1185 0.0016 4.9556 0.0671 0.3033 0.0025 1944 24 1812 12 1708 12 AZ20-1-1-67 264.52 0.00 373.65 738.36 0.51 0.1185 0.0012 4.4044 0.0486 0.2689 0.0021 1944 17 1713 9 1535 11 AZ20-1-1-45 107.18 2.89 75.62 391.51 0.19 0.1169 0.0011 3.9682 0.0455 0.2446 0.0019 1910 17 1628 9 1411 10 AZ20-1-1-41 16.00 36.68 9.47 62.88 0.15 0.1156 0.0020 3.9194 0.0868 0.2444 0.0037 1889 32 1618 18 1410 19 AZ20-1-1-38 33.84 22.45 39.19 82.43 0.48 0.1145 0.0013 5.1500 0.0593 0.3247 0.0017 1873 22 1844 10 1812 9 AZ20-1-1-07 146.16 42.92 90.03 647.87 0.14 0.1121 0.0012 3.2061 0.0337 0.2063 0.0011 1835 20 1459 8 1209 6 AZ20-1-1-57 73.96 34.63 101.25 360.37 0.28 0.1102 0.0012 2.5557 0.0311 0.1673 0.0014 1802 19 1288 9 997 8 AZ20-1-1-04 115.99 83.21 172.23 432.38 0.40 0.1061 0.0010 3.1921 0.0362 0.2170 0.0015 1800 19 1455 9 1266 8 AZ20-1-1-36 41.60 1.86 112.79 132.55 0.85 0.1088 0.0013 3.2205 0.0383 0.2142 0.0013 1780 23 1462 9 1251 7 AZ20-1-1-33 21.80 42.87 34.68 184.73 0.19 0.1085 0.0023 1.5920 0.0624 0.0984 0.0026 1774 6 967 24 605 15 AZ20-1-1-56 106.04 0.00 71.67 433.75 0.17 0.1083 0.0012 3.3155 0.0333 0.2207 0.0012 1772 20 1485 8 1285 6 AZ20-1-1-63 7.03 8.90 21.31 19.29 1.11 0.1079 0.0027 3.3967 0.0880 0.2329 0.0035 1765 46 1504 20 1350 18 AZ20-1-1-10 2.81 24.63 11.67 19.15 0.61 0.1058 0.0036 1.2781 0.0396 0.0892 0.0011 1729 63 836 18 551 6 AZ20-1-1-26 135.84 44.40 162.79 603.29 0.27 0.1056 0.0010 2.8577 0.0324 0.1952 0.0014 1724 18 1371 9 1149 8 AZ20-1-1-68 74.54 18.15 130.63 213.38 0.61 0.1052 0.0012 3.7976 0.0503 0.2610 0.0023 1717 21 1592 11 1495 12 AZ20-1-1-62 19.84 20.74 126.88 73.37 1.73 0.1004 0.0017 1.9869 0.0357 0.1438 0.0015 1631 33 1111 12 866 8 AZ20-1-1-11 2.12 0.00 6.54 11.23 0.58 0.1000 0.0038 1.8701 0.0697 0.1383 0.0018 1625 70 1071 25 835 10 AZ20-1-1-48 39.21 9.50 66.84 347.72 0.19 0.0934 0.0013 1.3598 0.0358 0.1030 0.0020 1498 27 872 15 632 12 AZ20-1-1-22 53.91 22.41 182.15 165.62 1.10 0.0922 0.0012 2.7376 0.0401 0.2145 0.0017 1472 21 1339 11 1253 9 AZ20-1-1-14 2.88 0.00 9.69 33.49 0.29 0.0886 0.0041 0.8394 0.0358 0.0713 0.0011 1396 88 619 20 444 6 AZ20-1-1-24 7.89 3.31 50.76 85.87 0.59 0.0788 0.0023 0.7293 0.0206 0.0676 0.0006 1169 62 556 12 422 4 AZ20-1-1-47 141.30 0.00 280.23 1863.43 0.15 0.0785 0.0009 0.7564 0.0117 0.0691 0.0006 1159 23 572 7 430 3 AZ20-1-1-17 7.91 0.00 6.97 81.54 0.09 0.0782 0.0024 0.9617 0.0472 0.0801 0.0025 1151 61 684 24 496 15 AZ20-1-1-01 49.01 0.00 75.61 614.72 0.12 0.0767 0.0010 0.7547 0.0097 0.0712 0.0004 1115 26 571 6 443 2 第二组:变质锆石: 269 ± 4 Ma（MSWD=9.5, n=11） AZ20-1-1-34 17.53 19.80 31.03 404.89 0.08 0.0527 0.0010 0.3194 0.0058 0.0438 0.0003 317 45 281 4 276 2 AZ20-1-1-66 74.13 75.80 142.45 1770.21 0.08 0.0515 0.0006 0.3119 0.0040 0.0438 0.0002 265 32 276 3 276 2 AZ20-1-1-43 3.34 13.79 1.39 75.94 0.02 0.0554 0.0023 0.3310 0.0130 0.0438 0.0004 432 88 290 10 276 3 AZ20-1-1-44 6.09 13.24 2.39 144.21 0.02 0.0529 0.0016 0.3169 0.0093 0.0435 0.0004 328 69 280 7 275 2 AZ20-1-1-19 149.04 0.00 37.45 3801.18 0.01 0.0521 0.0006 0.3096 0.0034 0.0430 0.0003 287 31 274 3 271 2 AZ20-1-1-72 116.14 0.00 20.09 2934.17 0.01 0.0531 0.0007 0.3152 0.0040 0.0429 0.0003 332 30 278 3 271 2 AZ20-1-1-21 10.34 28.28 2.65 251.55 0.01 0.0507 0.0013 0.2948 0.0076 0.0424 0.0003 228 61 262 6 268 2 AZ20-1-1-03 18.98 35.71 5.02 467.90 0.01 0.0520 0.0010 0.3014 0.0054 0.0421 0.0003 283 43 268 4 266 2 AZ20-1-1-12 15.60 34.53 6.27 379.74 0.02 0.0533 0.0010 0.3081 0.0057 0.0419 0.0003 343 43 273 4 265 2 AZ20-1-1-50 66.94 0.00 14.87 1740.25 0.01 0.0527 0.0006 0.3043 0.0036 0.0418 0.0002 322 26 270 3 264 1 AZ20-1-1-18 90.61 2.61 264.05 2182.45 0.12 0.0528 0.0006 0.3048 0.0034 0.0417 0.0002 320 26 270 3 263 1 注: TotalPb表示放射性成因Pb含量总和；CommonPb表示普通铅204Pb含量 
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表 2 狼山地区乌拉山岩群花岗质浅色脉体LA-ICP-MS锆石U-Th-Pb定年结果
Table 2. LA-ICP-MS zircons U-Th-Pb analyses from granitic leucosome of the Wulashan Group in the Langshan area
样品点 同位素含量/10-6 Th/U 同位素比值 年龄/Ma Total Pb Common Pb 232Th 238U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ AZ20-2-1-12 328.20 280.57 64.67 4403.67 0.01 0.0523 0.0035 0.3028 0.0221 0.0429 0.0013 302 156 269 17 271 8 AZ20-2-1-11 491.34 302.71 374.56 8571.13 0.04 0.0534 0.0007 0.3002 0.0039 0.0406 0.0003 343 25 267 3 257 2 AZ20-2-1-18 351.36 173.59 227.37 12754.06 0.02 0.0514 0.0006 0.2909 0.0034 0.0408 0.0003 261 26 259 3 258 2 AZ20-2-1-08 187.00 0.00 173.97 8714.89 0.02 0.0520 0.0006 0.2947 0.0036 0.0409 0.0003 287 32 262 3 258 2 AZ20-2-1-16 362.94 0.00 165.39 9284.15 0.02 0.0509 0.0006 0.2884 0.0035 0.0410 0.0004 239 28 257 3 259 2 AZ20-2-1-23 347.22 63.53 148.24 8446.56 0.02 0.0514 0.0006 0.2930 0.0035 0.0412 0.0003 261 26 261 3 260 2 AZ20-2-1-05 311.94 93.89 248.15 6958.49 0.04 0.0529 0.0007 0.3045 0.0042 0.0415 0.0004 324 28 270 3 262 2 AZ20-2-1-01 334.70 185.86 246.09 12917.98 0.02 0.0501 0.0006 0.2895 0.0033 0.0418 0.0003 198 31 258 3 264 2 AZ20-2-1-03 499.83 115.73 315.59 8973.66 0.04 0.0518 0.0006 0.2998 0.0034 0.0418 0.0003 276 26 266 3 264 2 AZ20-2-1-24 273.59 193.65 180.18 7509.80 0.02 0.0536 0.0007 0.3137 0.0043 0.0422 0.0004 354 30 277 3 267 2 AZ20-2-1-06 514.92 66.80 216.46 12871.60 0.02 0.0508 0.0006 0.2971 0.0036 0.0423 0.0004 232 26 264 3 267 2 AZ20-2-1-22 302.30 131.66 136.86 5667.06 0.02 0.0535 0.0008 0.3159 0.0048 0.0427 0.0004 350 33 279 4 270 2 AZ20-2-1-20 231.22 31.66 213.66 7709.46 0.03 0.0504 0.0006 0.2989 0.0039 0.0428 0.0003 213 30 266 3 270 2 AZ20-2-1-19 371.12 328.95 267.15 8937.70 0.03 0.0538 0.0007 0.3211 0.0044 0.0431 0.0004 365 23 283 3 272 2 AZ20-2-1-21 340.67 82.38 330.99 8424.34 0.04 0.0506 0.0007 0.3031 0.0043 0.0432 0.0003 220 31 269 3 273 2 注: TotalPb表示放射性成因Pb含量总和；CommonPb表示普通铅204Pb含量
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① 天津地质矿产研究所.内蒙古1: 5万那仁宝力格幅(K48E018018)、瑙云乌苏幅(K48E018019)、希宁乌苏庙幅(K48E019018)、玻璃庙幅(K48E019019)区调地质调查报告. 2011.
② 内蒙古自治区地质调查院.内蒙古1: 25万白云鄂博幅区域地质调查报告. 2003.
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