Monazite LA-ICP-MS U-Pb Dating to Constrain the Metamorphic Age of the Muzidian Gneiss Complex in the Northern Dabie Orogen
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摘要:
北大别构造带木子店片麻杂岩是目前华南陆块范围内出露的最古老岩石，但有关其变质时代和构造性质等问题仍缺乏研究。对这些岩石的变质时代开展研究，对于了解华南陆块早期地壳演化过程具有重要意义。本文利用LA-ICP-MS方法对木子店片麻杂岩中两件片麻岩样品进行了独居石的微区原位U-Pb定年和微量元素分析，采用独居石标准物质44069对年龄进行校正，独居石标准物质Trebilcock作为监控，测试结果与其推荐值在误差范围内相一致。结果显示，大多数独居石具有均一、无环带特点，且存在重稀土元素明显亏损以及负Eu异常，暗示其可能形成于变质成因。两件片麻岩样品的独居石U-Pb年龄分别为129±1Ma和130±1Ma，代表了木子店片麻杂岩发生变质作用的时间，这一年龄与木子店地区早白垩世花岗岩的侵位年龄基本一致，也与北大别造山带内大量出露的混合岩时代相吻合。研究认为大别造山带早白垩世加厚地壳的伸展垮塌和造山山根拆沉，引起了变质作用和同时代的岩浆活动，将北大别构造带从挤压向伸展的构造转换时间限定在～130Ma。
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关键词:
- 木子店片麻杂岩 /
- 变质作用 /
- 独居石 /
- 北大别构造带 /
- 英云闪长片麻岩；LA-ICP-MS
Abstract:The Muzidian gneiss complex (MGC) in the Northern Dabie Orogen is the oldest exposed rock formation in the South China block. However, there is still a lack of research on its metamorphic age and tectonic implications. LA-ICP-MS in situ U-Pb dating and trace element analysis of monazite were carried out on two gneiss samples from the MGC. The results show that most monazite grains exhibit homogeneous features with no zoning, evident depletion of HREEs and negative Eu anomalies, suggesting that they may be of metamorphic origin. The monazite U-Pb ages of the two gneiss samples are 129±1Ma and 130±1Ma, respectively, which represent the time of metamorphism of the MGC. These ages are broadly consistent with the emplacement age of the early Cretaceous granitoids in the Muzidian area, as well as the large amount of exposed migmatites in the Northern Dabie Orogen. Our study shows that the extensional collapse of the thickened continental crust and the delamination of the orogenic crustal root during the early Cretaceous of the Dabie Orogen caused contemporaneous metamorphism, migmatation, and magmatism, which constrained the tectonic regime switch time of the Northern Dabie Orogen from compression to extension to ~130Ma. The BRIEF REPORT is available for this paper at
http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.202403050032 .-
Key words:
- Muzidian gneiss complex /
- metamorphism /
- monazite /
- Northern Dabie Orogen /
- tonalitic gneiss; LA-ICP-MS
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表 1 北大别木子店片麻杂岩独居石U-Pb同位素组成和年龄值
Table 1. U-Pb isotopic ratios and apparent ages of monazite from Muzidian gneiss complex in the Northern Dabie Orogen
样品22MW11
测点Th含量
(μg/g)U含量
(μg/g)207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U 206Pb/238U 谐和度
(%)比值 1σ 比值 1σ 比值 1σ 年龄(Ma) 1σ 年龄(Ma) 1σ 年龄(Ma) 1σ MW11-1 186410 7332 0.0491 0.0012 0.1344 0.0037 0.0198 0.0002 154 56 128 3 126 2 98 MW11-2 197307 3778 0.0470 0.0013 0.1296 0.0037 0.0200 0.0002 50.1 72 124 3 128 1 96 MW11-3 172276 3779 0.0501 0.0017 0.1404 0.0047 0.0204 0.0002 211 76 133 4 130 2 97 MW11-6 227338 6906 0.0484 0.0011 0.1323 0.0030 0.0199 0.0002 120 54 126 3 127 1 99 MW11-7 192879 4041 0.0483 0.0017 0.1353 0.0047 0.0204 0.0002 117 82 129 4 130 1 98 MW11-9 180820 4645 0.0500 0.0016 0.1365 0.0044 0.0199 0.0003 198 105 130 4 127 2 97 MW11-10 213252 10626 0.0483 0.0012 0.1363 0.0035 0.0205 0.0002 122 57 130 3 131 2 99 MW11-11 174629 4962 0.0507 0.0023 0.1447 0.0067 0.0208 0.0003 228 106 137 6 133 2 96 MW11-12 198507 3882 0.0486 0.0014 0.1374 0.0040 0.0206 0.0002 128 69 131 4 131 2 99 MW11-14 179763 3510 0.0471 0.0015 0.1312 0.0045 0.0201 0.0002 53.8 74 125 4 128 2 97 MW11-15 207922 2505 0.0490 0.0018 0.1356 0.0050 0.0203 0.0003 146 89 129 5 129 2 99 MW11-16 177388 6678 0.0475 0.0012 0.1314 0.0035 0.0200 0.0002 76.0 94 125 3 128 1 98 MW11-17 211743 2839 0.0499 0.0017 0.1404 0.0046 0.0205 0.0002 191 112 133 4 131 2 98 MW11-18 184015 2839 0.0474 0.0016 0.1328 0.0046 0.0204 0.0002 77.9 69 127 4 130 2 97 MW11-19 213105 3124 0.0473 0.0017 0.1320 0.0049 0.0203 0.0002 61.2 85 126 4 129 2 97 MW11-20 167763 4389 0.0502 0.0017 0.1399 0.0046 0.0203 0.0002 206 80 133 4 130 2 97 MW11-22 192664 8380 0.0497 0.0017 0.1406 0.0050 0.0204 0.0002 189 78 134 4 130 1 97 MW11-23 243780 4535 0.0481 0.0018 0.1334 0.0049 0.0202 0.0002 102 91 127 4 129 2 98 MW11-24 184068 3900 0.0492 0.0017 0.1364 0.0048 0.0201 0.0003 167 80 130 4 128 2 98 MW11-25 188850 8382 0.0484 0.0012 0.1335 0.0033 0.0199 0.0002 120 56 127 3 127 1 99 MW11-26 180843 6387 0.0483 0.0015 0.1359 0.0043 0.0204 0.0002 122 74 129 4 130 1 99 MW11-27 207930 5238 0.0476 0.0010 0.1301 0.0028 0.0198 0.0002 79.7 50 124 3 126 1 98 MW11-28 197678 2753 0.0471 0.0016 0.1340 0.0046 0.0206 0.0002 53.8 78 128 4 131 2 97 MW11-30 195694 3999 0.0484 0.0020 0.1332 0.0053 0.0201 0.0003 117 96 127 5 128 2 98 MW11-32 177606 5946 0.0506 0.0017 0.1398 0.0044 0.0201 0.0002 233 76 133 4 128 2 96 MW11-34 200061 3514 0.0493 0.0021 0.1388 0.0058 0.0206 0.0002 161 98 132 5 131 2 99 MW11-35 194798 5650 0.0476 0.0014 0.1329 0.0039 0.0203 0.0002 79.7 70 127 3 130 2 97 MW11-36 174154 2157 0.0498 0.0014 0.1358 0.0038 0.0199 0.0002 183 69 129 3 127 1 98 MW11-37 178861 2757 0.0493 0.0016 0.1365 0.0044 0.0202 0.0002 161 74 130 4 129 2 99 MW11-38 180591 6144 0.0474 0.0013 0.1363 0.0037 0.0210 0.0002 77.9 136 130 3 134 1 96 MW11-39 175177 6068 0.0469 0.0010 0.1313 0.0031 0.0203 0.0002 55.7 39 125 3 129 1 96 MW11-40 187657 4194 0.0473 0.0017 0.1348 0.0050 0.0208 0.0003 64.9 85 128 5 133 2 96 样品22MW01
测点Th含量
(μg/g)U含量
(μg/g)207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U 206Pb/238U 谐和度
(%)比值 1σ 比值 1σ 比值 1σ 年龄(Ma) 1σ 年龄(Ma) 1σ 年龄(Ma) 1σ MW1-1 166645 3043 0.0490 0.0018 0.1400 0.0050 0.0207 0.0003 150 85 133 5 132 2 99 MW1-5 262630 7005 0.0489 0.0010 0.1346 0.0029 0.0199 0.0002 143 45 128 3 127 1 99 MW1-7 191746 5815 0.0507 0.0018 0.1448 0.0051 0.0208 0.0003 233 82 137 5 133 2 96 MW1-8 133410 2873 0.0474 0.0019 0.1310 0.0050 0.0202 0.0002 77.9 83 125 5 129 2 96 MW1-9 181982 3623 0.0499 0.0014 0.1382 0.0039 0.0201 0.0003 191 67 131 4 128 2 97 MW1-10 242641 3159 0.0489 0.0019 0.1346 0.0053 0.0201 0.0002 143 91 128 5 128 2 99 MW1-12 252773 9255 0.0505 0.0011 0.1374 0.0031 0.0198 0.0002 217 84 131 3 126 2 96 MW1-14 240269 4057 0.0496 0.0029 0.1370 0.0087 0.0201 0.0003 189 135 130 8 128 2 98 MW1-18 139956 3108 0.0495 0.0015 0.1397 0.0045 0.0204 0.0003 169 70 133 4 130 2 98 MW1-21 263686 10469 0.0471 0.0010 0.1310 0.0031 0.0202 0.0003 53.8 149 125 3 129 2 97 MW1-22 226722 3006 0.0507 0.0018 0.1433 0.0050 0.0206 0.0003 228 82 136 5 131 2 96 MW1-23 224741 3177 0.0492 0.0017 0.1415 0.0053 0.0208 0.0002 167 82 134 5 133 2 98 MW1-25 230108 2332 0.0482 0.0021 0.1381 0.0060 0.0210 0.0003 109 95 131 5 134 2 98 MW1-26 144067 1911 0.0488 0.0022 0.1376 0.0062 0.0207 0.0003 200 103 131 6 132 2 99 MW1-29 268982 2672 0.0512 0.0020 0.1420 0.0052 0.0204 0.0003 250 86 135 5 130 2 96 MW1-30 156794 5440 0.0466 0.0017 0.1322 0.0047 0.0207 0.0003 31.6 91 126 4 132 2 95 MW1-6 69266 3613 0.0521 0.0025 0.2683 0.0128 0.0373 0.0006 300 105 241 10 236 4 97 MW1-27 34270 4206 0.0551 0.0013 0.4559 0.0107 0.0602 0.0006 417 58 381 8 377 4 98 注：235U衰变常数为9.8485×10−10a，238U衰变常数为1.55125×10−10a；238U/235U=137.88。 
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表 2 北大别木子店片麻杂岩独居石微量元素组成
Table 2. Trace element contents of monazite from Muzidian gneiss complex in the Northern Dabie Orogen
样品编号 元素含量(μg/g) La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y Th U Si MW11-1 138521 199176 15840 46140 4077 272 3066 173 573 80.0 160 12.7 56.9 6.34 2124 186410 7332 41727 MW11-2 143070 196675 14714 42334 3158 259 2589 121 364 49.5 100 8.18 36.5 4.26 1333 197307 3778 42534 MW11-3 138555 202502 16616 49693 4628 272 3447 207 703 95.7 185 14.5 68.5 6.74 2550 172276 3779 40078 MW11-6 137308 179216 12685 33671 2345 241 2247 91.9 288 40.0 85.3 6.54 34.8 4.10 1080 227338 6906 57053 MW11-7 140932 193833 15030 43731 3458 250 2770 134 418 56.2 112 8.65 37.6 4.11 1485 192879 4041 45845 MW11-9 140270 197158 15210 43927 3466 261 2779 137 450 63.4 127 10.0 43.4 4.35 1655 180820 4645 44196 MW11-10 138311 180924 12586 34588 2619 255 2446 112 373 50.4 103 8.28 35.3 3.94 1346 213252 10626 54893 MW11-11 133330 195509 15880 49487 4911 275 3691 238 862 117 223 17.7 76.2 8.04 3001 174629 4962 40191 MW11-12 128565 188117 15211 47303 4100 266 2922 159 506 68.9 135 10.4 47.7 4.97 1783 198507 3882 46016 MW11-14 138239 193244 15258 45785 3612 259 2779 133 413 54.4 110 7.74 35.9 3.82 1427 179763 3510 42572 MW11-15 125427 182828 14895 46925 3931 258 2809 140 434 55.1 112 8.01 34.5 3.83 1463 207922 2505 52004 MW11-16 135816 191316 14721 45225 3953 265 3100 168 581 78.5 153 12.0 53.3 5.81 2054 177388 6678 42943 MW11-17 129835 182962 14042 42579 3309 250 2523 115 348 46.4 95.9 6.78 33.8 3.39 1239 211743 2839 55636 MW11-18 136910 189546 14882 44646 3560 258 2766 133 411 54.7 109 7.87 36.7 3.94 1436 184015 2839 43140 MW11-19 128190 181294 14211 42072 3233 252 2499 116 347 45.9 94.0 7.21 35.1 3.29 1228 213105 3124 53381 MW11-20 135145 195703 15825 46799 4180 252 3259 184 625 88.3 170 14.0 61.8 6.45 2270 167763 4389 34881 MW11-22 132014 182367 13817 40792 3535 253 2938 156 525 72.4 140 11.3 49.1 5.29 1877 192664 8380 50744 MW11-23 114156 166619 13063 39294 2906 255 2167 98.8 282 36.8 78.1 5.72 25.5 2.92 982 243780 4535 65177 MW11-24 136312 189089 14052 40820 3094 248 2565 121 397 53.9 111 8.17 42.4 4.22 1439 184068 3900 43658 MW11-25 128308 183106 14339 43132 3672 256 2857 157 526 72.1 148 11.5 51.3 5.60 1942 188850 8382 46737 MW11-26 126226 185572 14703 44785 4464 271 3364 219 812 112 220 17.7 78.4 8.31 2975 180843 6387 40228 MW11-27 128463 176009 13386 38839 2958 244 2407 110 340 45.9 95.0 7.10 34.0 3.81 1213 207930 5238 50059 MW11-28 129218 181035 14100 41784 3095 255 2396 108 322 42.5 87.8 6.66 29.6 3.34 1142 197678 2753 47381 MW11-30 130004 180582 13751 41552 3166 246 2497 114 352 46.0 94.4 7.12 34.7 3.33 1237 195694 3999 45829 MW11-32 126189 182886 14535 44930 3789 252 2955 160 555 77.4 154 12.3 56.2 5.95 2012 177606 5946 42733 MW11-34 118846 170988 13533 41324 3394 245 2608 136 435 58.5 119 9.45 37.5 4.34 1566 200061 3514 60236 MW11-35 126117 178981 13751 41292 3120 255 2497 115 359 48.9 97.9 7.20 35.6 3.63 1295 194798 5650 47697 MW11-36 126109 183416 14810 48039 4040 255 2959 152 472 61.3 120 9.08 38.9 4.05 1556 174154 2157 42681 MW11-37 126057 180966 14600 45086 3688 249 2822 139 434 58.1 113 8.52 36.3 3.55 1490 178861 2757 45309 MW11-38 128255 179239 13777 40359 3255 252 2675 135 480 68.4 137 11.2 47.9 5.27 1786 180591 6144 43495 MW11-39 126166 183025 14320 43528 3707 257 2909 160 548 76.9 149 11.8 50.1 5.73 2044 175177 6068 41464 MW11-40 131049 177956 13209 38550 2909 232 2433 108 343 46.9 97.2 7.59 36.5 3.94 1258 187657 4194 45326 MW11-29 128500 180131 14261 43697 3424 241 2591 123 380 51.0 104 7.40 34.5 3.65 1348 191806 3201 48000 样品编号 元素含量(μg/g) La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y Th U Si MW1-1 158157 212653 15817 44459 3476 159 3116 146 445 59.4 115 8.86 36.1 4.02 1633 166645 3043 36883 MW1-5 123671 173235 13143 39498 2992 207 2474 115 350 47.4 96.8 7.53 32.1 3.50 1194 262630 7005 66654 MW1-7 156116 202450 14113 38157 2734 153 2721 113 358 47.1 99.2 7.67 33.4 3.31 1345 191746 5815 46068 MW1-8 170321 226809 16461 47368 3828 170 3456 173 539 72.1 137 10.1 42.8 4.50 1855 133410 2873 28844 MW1-9 149310 205327 15638 46605 3903 180 3248 168 543 69.5 136 10.4 44.0 4.18 1817 181982 3623 42624 MW1-10 129912 183044 14344 42810 3291 218 2623 125 382 51.6 106 8.17 34.5 3.79 1334 242641 3159 55240 MW1-12 127926 174960 13094 37233 2711 215 2326 99.3 302 40.7 83.1 6.35 28.2 3.19 1066 252773 9255 66267 MW1-14 129500 180618 13711 40271 2985 209 2443 113 344 47.5 94.4 7.94 36.9 4.69 1211 240269 4057 57984 MW1-18 165035 222645 15924 44681 3452 158 3143 145 454 60.8 119 8.75 39.0 3.99 1623 139956 3108 29700 MW1-21 121663 170826 12812 36653 2650 214 2237 100 311 42.8 86.2 7.09 30.2 3.12 1111 263686 10469 66797 MW1-22 135213 186713 14368 42543 3259 223 2590 117 353 45.7 94.3 6.77 30.5 2.86 1184 226722 3006 54088 MW1-23 128995 185314 14897 45653 3949 188 3060 171 561 76.1 145 10.9 46.3 4.84 1969 224741 3177 58256 MW1-25 133317 184376 14544 43366 3269 220 2615 123 379 52.1 103 7.82 34.9 3.41 1311 230108 2332 54878 MW1-26 168153 221184 15725 44612 3569 153 3163 149 439 56.8 107 7.57 31.2 3.38 1569 144067 1911 35698 MW1-29 120654 166938 13169 39012 3006 215 2364 111 348 46.8 94.5 6.89 31.3 3.49 1178 268982 2672 68041 MW1-30 164943 215486 15035 40775 2993 145 2873 128 389 51.0 101 7.42 31.5 3.02 1423 156794 5440 36654 MW1-6 169915 257423 20702 63531 5832 146 4160 211 605 73.9 137 9.41 39.2 3.80 1978 69266 3613 14800 MW1-27 189722 268973 20096 57313 4524 262 3735 189 590 76.3 145 9.28 39.7 3.84 1938 34270 4206 8600
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