Zircon U-Pb age and Hf isotopic characteristics of the Diebusige Complex in Langshan area, Inner Mongolia, and its constraints on the tectonic evolution of the Alxa Block
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摘要:
阿拉善地块位于华北克拉通西端，其早前寒武纪地质演化一直存在争议。选取阿拉善地块东北缘的叠布斯格岩群为研究对象，通过锆石U-Pb定年和Lu-Hf同位素分析，探讨阿拉善地块的性质和归属及华北克拉通早期地质演化。叠布斯格岩群主要由变质沉积岩和变质火山岩组成，包括高级变质的片麻岩、大理岩、石英岩、角闪岩，并被古元古代钾质花岗岩侵入。来自叠布斯格岩群3个副片麻岩样品的LA-ICP-MS锆石U-Pb定年结果显示，叠布斯格岩群副片麻岩中碎屑锆石的207Pb/206Pb年龄范围为2.60~2.10 Ga，变质锆石的年龄显示叠布斯格岩群经历了1.98~1.90 Ga和1.90~1.79 Ga的两组峰期变质作用，指示叠布斯格岩群原岩形成于2.10~1.98 Ga。研究区未发现有太古宙岩石出露，但不排除其下部地壳中存在太古宙基底岩石的可能。碎屑锆石的Lu-Hf同位素数据结果显示，叠布斯格岩群副片麻岩中碎屑锆石的εHf(t)均为负值，指示其成岩物质源于古—中太古代(3.42~2.79 Ga)古老地壳在新太古代晚期—古元古代早期的重熔或再造。通过对比叠布斯格岩群和阴山地块、孔兹岩带的岩浆-变质事件及Hf同位素特征，推测阿拉善地块前寒武纪基底在古元古代可能是孔兹岩带的一部分。
Abstract:The Alxa Block is located in the western part of the North China Craton (NCC), and its Precambrian geological evolution has been long controversial.In this study, the in-situ zircon U-Pb dating and the Lu-Hf isotope analysis were conducted on the Precambrian basement at the northeast margin of the Alxa Block, which called the Diebusige Complex.The Diebusige Complex consists mainly of metamorphic supracrustal rocks and metamorphic plutonic rocks, including high grade metamorphic gneiss, marble, quartzite, amphibolite and intruded K-felspar granite.LA-ICP-MS zircon U-Pb dating results of three paragneiss samples show that the detrital zircons from the Diebusige Complex yielded 207Pb/206Pb ages range from 2.60 Ga to 2.10 Ga, and the Diebusige Complex subjected to high grade metamorphic events at 1.98~1.90 Ga and 1.90~1.79 Ga, suggesting that the protoliths of the Diebusige Complex may be deposited at 2.10~1.98 Ga.There is no evidence of Archean rocks exposed in Langshan area, but the possibility of Archean rocks exist at deeper crustal levels cannot be ruled out.Zircon Lu-Hf isotopic data shows that the diagenetic material of the Diebusige Complex was originated from the reworking of Early-Middle Archean crust (3.42~2.79 Ga).Comparing the Diebusige Complex with the Yinshan Block and the Khondalite Belt in magmatic-metamorphic events and the Hf isotopic charateristics.We speculate that the Precambrian basements of the Alxa Block are probably part of the Khondalite Belt in Paleoproterozoic.
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Key words:
- North China Craton /
- Alxa Block /
- Diebusige Complex /
- Paleoproterozoic /
- zircon U-Pb age /
- Hf isotope /
- geological survey engineering
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表 1 叠布斯格岩群角闪斜长片麻岩(17N02-5)与黑云斜长片麻岩(17N06)LA-ICP-MS锆石U-Th-Pb分析结果
Table 1. Zircon U-Th-Pb isotope compositions of the amphibole plagio-gneiss (17N02-5) and the biotite plagioclase gneiss samples (17N06) as measured by LA-ICP-MS technique
样品点号 含量/10-6 Th/U 同位素比值 年龄/Ma 谐和度/% Pb Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 17N02-5-01 207 160 302 0.53 0.1467 0.0020 8.8845 0.2597 0.4343 0.0101 2309 24.1 2325 45 99 17N02-5-02 84.9 109 127 0.86 0.1131 0.0013 5.3817 0.0774 0.3447 0.0039 1850 22.2 1909 19 98 17N02-5-03 375 271 634 0.43 0.1478 0.0017 8.9798 0.2106 0.4378 0.0086 2320 18.7 2341 39 99 17N02-5-04 7.48 4.99 19.1 0.26 0.1115 0.0025 5.0624 0.1342 0.3291 0.0056 1824 40.9 1834 27 99 17N02-5-05 77.0 53.0 141 0.38 0.1376 0.0019 7.7274 0.1362 0.4064 0.0055 2198 24.1 2199 25 99 17N02-5-06 111 101 190 0.53 0.1310 0.0018 6.6919 0.1017 0.3693 0.0039 2122 24.1 2026 18 97 17N02-5-07 145.7 102.2 286 0.36 0.1304 0.0019 6.7524 0.1428 0.3732 0.0057 2103 26.2 2044 27 98 17N02-5-08 288 79.8 621 0.13 0.1576 0.0025 9.9965 0.3259 0.4563 0.0125 2431 27.0 2423 55 99 17N02-5-09 268 216 356 0.61 0.1519 0.0022 9.4839 0.1596 0.4517 0.0057 2368 24.4 2403 25 99 17N02-5-10 246 266 300 0.89 0.1393 0.0017 8.0217 0.1141 0.4166 0.0051 2220 20.4 2245 23 99 17N02-5-11 118 141 207 0.68 0.1102 0.0016 4.8535 0.0796 0.3187 0.0047 1803 25.6 1783 23 99 17N02-5-12 161 335 47.5 7.04 0.1136 0.0021 5.2974 0.1270 0.3370 0.0060 1858 28.5 1872 29 99 17N02-5-13 62.0 110 68.5 1.61 0.1106 0.0024 4.5684 0.0865 0.3014 0.0057 1810 37.8 1698 28 97 17N02-5-14 315 415 544 0.76 0.1122 0.0014 4.8065 0.0900 0.3087 0.0046 1836 23.0 1734 23 97 17N02-5-15 255 356 425 0.84 0.1107 0.0020 4.6776 0.0671 0.3065 0.0037 1813 27.3 1723 18 97 17N02-5-16 64.6 108 52.2 2.06 0.1121 0.0018 5.2443 0.1067 0.3376 0.0048 1835 29.6 1875 23 99 17N02-5-17 541 757 784 0.97 0.1138 0.0013 5.0726 0.0728 0.3223 0.0042 1861 21.8 1801 21 98 17N02-5-18 217 177 284 0.62 0.1509 0.0018 9.0201 0.1268 0.4326 0.0058 2367 20.4 2318 26 99 17N02-5-19 289 250 431 0.58 0.1379 0.0025 7.7191 0.2643 0.3944 0.0085 2202 31.5 2143 39 97 17N02-5-20 80 105 76.3 1.38 0.1330 0.0025 8.6585 0.2479 0.4712 0.0117 2139 32.4 2489 51 92 17N02-5-21 14.4 11.1 32.7 0.34 0.1123 0.0031 5.1502 0.1250 0.3348 0.0060 1837 50.0 1861 29 99 17N02-5-22 4.24 3.88 7.34 0.53 0.1285 0.0063 5.7801 0.2988 0.3381 0.0121 2080 87.0 1877 58 96 17N02-5-23 224 296 309 0.96 0.1127 0.0017 5.2191 0.0869 0.3359 0.0049 1844 27.8 1867 23 99 17N02-5-24 145 135 255 0.53 0.1207 0.0017 5.9307 0.0944 0.3550 0.0041 1966 24.5 1959 20 99 17N02-5-25 220 178 276 0.64 0.1603 0.0019 10.3329 0.1453 0.4652 0.0049 2459 20.4 2462 21 99 17N02-5-26 290 449 268 1.68 0.1137 0.0014 5.4906 0.0730 0.3491 0.0037 1859 22.5 1930 18 98 17N02-5-27 185 266 188 1.41 0.1184 0.0019 5.6305 0.0939 0.3439 0.0047 1933 27.8 1905 22 99 17N02-5-28 220 278 300 0.93 0.1208 0.0019 5.8487 0.0999 0.3495 0.0046 1968 27.8 1932 22 98 17N02-5-29 96 160 92.3 1.73 0.1130 0.0018 5.0487 0.0832 0.3232 0.0041 1850 29.6 1806 20 98 17N02-5-30 678 483 1695 0.28 0.1150 0.0014 5.2572 0.0736 0.3301 0.0034 1879 22.4 1839 17 98 17N02-5-31 195 251 305 0.82 0.1184 0.0016 5.2816 0.0784 0.3230 0.0039 1933 23.9 1804 19 96 17N02-5-32 159 186 233 0.80 0.1356 0.0025 6.8254 0.1730 0.3703 0.0112 2172 31.8 2031 53 97 17N02-5-33 213 153 268 0.57 0.1619 0.0020 10.3748 0.1810 0.4635 0.0067 2476 21.5 2455 30 99 17N02-5-34 26.8 39.9 22.5 1.77 0.1189 0.0043 5.7160 0.2225 0.3591 0.0130 1940 63.7 1978 61 97 17N02-5-35 8.26 8.73 13.0 0.67 0.1175 0.0049 5.5269 0.2605 0.3494 0.0133 1920 74.5 1932 64 98 17N02-5-36 270 214 368 0.58 0.1516 0.0022 9.1920 0.1662 0.4387 0.0052 2365 24.1 2345 23 99 17N02-5-37 24.7 38.1 23.9 1.60 0.1125 0.0042 5.2997 0.1875 0.3490 0.0081 1839 66.7 1930 39 96 17N02-5-38 442 383 644 0.59 0.1347 0.0017 8.3418 0.2006 0.4476 0.0088 2161 22.2 2385 39 95 17N02-5-39 7.44 7.48 12.2 0.62 0.1113 0.0044 5.1982 0.2030 0.3508 0.0115 1820 76.4 1938 55 95 17N02-5-40 192.8 103.2 390 0.26 0.1309 0.0018 6.8843 0.1116 0.3809 0.0042 2111 24.2 2080 19 99 17N02-5-41 272 272 341 0.80 0.1513 0.0024 8.2140 0.2050 0.3928 0.0076 2360 27.2 2136 35 94 17N02-5-42 468 445 549 0.81 0.1504 0.0017 8.7844 0.1307 0.4231 0.0048 2350 19.3 2275 22 98 17N02-5-43 21.3 28.9 20.3 1.43 0.1184 0.0038 5.7602 0.2182 0.3569 0.0108 1932 57 1968 51 98 17N02-5-44 585 558 590 0.95 0.1596 0.0019 9.8691 0.1372 0.4476 0.0041 2452 20.5 2385 18 98 17N02-5-45 197 138 255 0.54 0.1512 0.0021 9.9800 0.2258 0.4763 0.0083 2359 23.9 2511 36 96 17N02-5-46 245 186 309 0.60 0.1558 0.0019 9.6774 0.1416 0.4494 0.0045 2411 20.4 2393 20 99 17N02-5-47 390 406 415 0.98 0.1421 0.0018 8.2344 0.1310 0.4191 0.0043 2253 22.4 2256 20 99 17N02-5-48 490 426 984 0.43 0.1304 0.0018 6.1854 0.1137 0.3428 0.0040 2103 23.9 1900 19 94 17N02-5-49 7.82 7.37 12.3 0.60 0.1185 0.0058 5.8789 0.4439 0.3639 0.0167 1944 88.7 2001 79 97 17N02-5-50 49.5 89.0 37.5 2.37 0.1118 0.0025 4.8351 0.1100 0.3153 0.0050 1829 39.0 1767 25 98 17N02-5-51 5.94 8.05 6.03 1.33 0.1201 0.0073 5.6777 0.3572 0.3564 0.0151 1958 108 1965 72 98 17N02-5-52 240.7 67.3 670 0.10 0.1154 0.0016 5.8135 0.1037 0.3645 0.0047 1887 30.7 2003 22 97 17N02-5-53 7.16 8.00 13.1 0.61 0.1107 0.0033 4.9202 0.1580 0.3264 0.0071 1813 48.9 1821 34 99 17N02-5-54 16.8 21.3 24.1 0.88 0.1120 0.0035 4.9790 0.1369 0.3313 0.0087 1832 55.7 1845 42 98 17N02-5-55 24.3 42.1 18.6 2.27 0.1124 0.0042 4.8887 0.1381 0.3186 0.0060 1839 67.0 1783 29 99 17N02-5-56 8.6 11.9 9.6 1.24 0.1179 0.0047 5.3028 0.2021 0.3517 0.0275 1926 70.5 1943 131 96 17N02-5-57 122 141 183 0.77 0.1191 0.0022 5.5495 0.1165 0.3385 0.0051 1943 33.5 1879 24 98 17N02-5-58 237 113.0 590 0.19 0.1157 0.0016 5.8436 0.0969 0.3660 0.0047 1900 25.8 2011 22 97 17N02-5-59 90 142 64.6 2.20 0.1194 0.0022 5.9012 0.1092 0.3610 0.0059 1947 33.3 1987 28 98 17N02-5-60 5.13 5.22 8.46 0.62 0.1011 0.0055 4.7118 0.2337 0.3546 0.0183 1644 101.4 1957 87 89 17N02-5-61 30.7 47.5 30.2 1.57 0.1129 0.0028 5.2048 0.1202 0.3362 0.0060 1847 43.8 1868 29 99 17N02-5-62 86.1 85.7 109 0.79 0.1311 0.0019 7.5003 0.1198 0.4147 0.0046 2122 25.9 2236 21 97 17N02-5-63 248 264 443 0.60 0.1133 0.0014 5.3005 0.0826 0.3390 0.0040 1854 21.1 1882 19 99 17N06-01 281.1 30.2 715 0.04 0.1167 0.0013 5.3431 0.0653 0.3320 0.0036 1906 21.5 1848 17 98 17N06-02 96 107 75.6 1.41 0.1138 0.0022 5.2810 0.0839 0.3366 0.0041 1861 35.2 1870 20 99 17N06-03 148.3 114.2 224 0.51 0.1167 0.0012 5.2621 0.0737 0.3264 0.0038 1906 17.9 1821 18 97 17N06-04 126.2 74.5 234 0.32 0.1103 0.0011 4.8762 0.0660 0.3204 0.0038 1803 17.4 1791 19 99 17N06-05 1234 1768 394 4.48 0.1137 0.0012 5.2407 0.0675 0.3337 0.0035 1861 18.5 1856 17 99 17N06-06 152 179 85.1 2.10 0.1172 0.0019 5.5624 0.1045 0.3436 0.0041 1914 29.6 1904 20 99 17N06-07 76 92 52.2 1.77 0.1110 0.0018 5.0485 0.1027 0.3301 0.0053 1816 29.8 1839 26 99 17N06-08 501 624 217 2.88 0.1124 0.0013 5.4620 0.0782 0.3521 0.0039 1839 22.1 1944 19 97 17N06-09 51.5 55.8 37.5 1.49 0.1183 0.0027 5.5348 0.1188 0.3416 0.0055 1931 41.8 1894 27 99 17N06-10 652 883 264 3.34 0.1118 0.0014 5.1301 0.0843 0.3329 0.0049 1828 22.7 1852 24 99 17N06-11 22.94 2.51 55.5 0.05 0.1142 0.0016 5.3784 0.1097 0.3403 0.0049 1933 24.8 1888 24 99 17N06-12 583 351 583 0.60 0.1503 0.0017 8.8199 0.1328 0.4245 0.0048 2350 18.7 2281 22 98 17N06-13 319 393 199 1.98 0.1101 0.0014 5.2721 0.0687 0.3472 0.0038 1811 17.4 1921 18 96 17N06-14 268 348 134 2.60 0.1123 0.0017 5.2036 0.1091 0.3360 0.0066 1839 27.3 1867 32 99 17N06-15 333 274 250 1.10 0.1350 0.0022 7.7429 0.2731 0.4095 0.0107 2165 27.8 2212 49 99 17N06-16 555 707 250 2.83 0.1125 0.0015 5.3520 0.0946 0.3451 0.0057 1840 24.1 1911 27 98 17N06-17 95 92.1 104 0.89 0.1117 0.0018 5.1625 0.1159 0.3342 0.0056 1828 29.5 1858 27 99 17N06-18 58.8 38.6 87.7 0.44 0.1099 0.0016 5.2142 0.1101 0.3434 0.0059 1798 26.1 1903 28 97 17N06-19 537 432 478 0.90 0.1360 0.0015 7.7200 0.1006 0.4114 0.0050 2177 19.1 2221 23 98 17N06-20 1365 1166 750 1.55 0.1546 0.0016 9.6428 0.1530 0.4511 0.0060 2398 17.3 2400 27 99 17N06-21 575 740 263 2.82 0.1134 0.0015 5.3855 0.1003 0.3443 0.0059 1855 23.9 1907 28 98 17N06-22 366 389 276 1.41 0.1187 0.0022 5.4203 0.1801 0.3285 0.0075 1939 34.7 1831 37 96 17N06-23 263 334 147 2.27 0.1114 0.0016 5.1507 0.1005 0.3349 0.0054 1833 25.9 1862 26 99 17N06-24 129 135 114 1.18 0.1104 0.0016 5.1934 0.0964 0.3410 0.0052 1806 26.5 1892 25 97 17N06-25 1012 719 721 1.00 0.1555 0.0017 9.7653 0.1423 0.4547 0.0051 2407 18.2 2416 23 99 17N06-26 63.7 44.8 85.1 0.53 0.1105 0.0021 5.4114 0.1089 0.3555 0.0046 1809 35.0 1961 22 96 17N06-27 496 317 330 0.96 0.1605 0.0022 11.0972 0.1768 0.5012 0.0053 2461 22.7 2619 23 96 17N06-28 315 403 168 2.40 0.1118 0.0020 5.1454 0.1087 0.3338 0.0052 1829 31.5 1857 25 99 17N06-29 84 95.8 59.7 1.61 0.1126 0.0024 5.0889 0.1227 0.3281 0.0057 1843 38.1 1829 28 99 17N06-30 239 186 164 1.14 0.1423 0.0023 8.4100 0.1486 0.4284 0.0047 2255 27.6 2299 21 99 17N06-31 326 403 159 2.53 0.1094 0.0016 5.3380 0.0858 0.3539 0.0041 1791 25.9 1953 19 95 17N06-32 463 330 374 0.88 0.1473 0.0021 8.7042 0.1659 0.4278 0.0065 2317 24.4 2296 30 99 17N06-33 137 171 120 1.43 0.1105 0.0022 4.6046 0.1162 0.3026 0.0074 1807 36.4 1704 37 97 17N06-34 429 343 262 1.31 0.1592 0.0026 9.9024 0.2072 0.4505 0.0079 2447 27.8 2397 35 98 17N06-35 294 226 253 0.90 0.1433 0.0024 8.0462 0.1480 0.4059 0.0044 2333 28.4 2196 20 98 17N06-36 77 85.4 58.3 1.47 0.1131 0.0024 5.3096 0.1233 0.3396 0.0043 1850 38.3 1885 21 99 17N06-37 375 312 315 0.99 0.1317 0.0023 7.3577 0.2426 0.4000 0.0094 2121 25.8 2169 43 99 17N06-38 731 877 546 1.61 0.1099 0.0015 4.9920 0.0882 0.3286 0.0046 1798 24.1 1831 22 99 17N06-39 70.9 72.3 51.4 1.41 0.1192 0.0023 5.8569 0.1377 0.3556 0.0058 1944 33.9 1961 28 99 17N06-40 266 208 230 0.90 0.1357 0.0023 7.8621 0.2677 0.4123 0.0093 2173 29.9 2226 42 99 17N06-41 197 254 103.0 2.46 0.1120 0.0017 5.1642 0.1070 0.3347 0.0070 1831 26.1 1861 34 99 17N06-42 104 129 89.6 1.44 0.1097 0.0024 4.4874 0.1216 0.2962 0.0064 1794 40.7 1673 32 96 17N06-43 145 161 107 1.51 0.1141 0.0019 5.2957 0.1159 0.3360 0.0061 1865 29.5 1868 29 99 17N06-44 207 230 136 1.69 0.1176 0.0018 5.8917 0.1418 0.3623 0.0075 1920 27.8 1993 35 98 17N06-45 106 122 70.5 1.73 0.1134 0.0019 5.3549 0.1168 0.3411 0.0054 1855 26.9 1892 26 99 17N06-46 90 100 67.9 1.48 0.1116 0.0022 5.1575 0.1118 0.3341 0.0046 1826 35.0 1858 22 99 17N06-47 268 179 238 0.76 0.1478 0.0017 8.7657 0.1119 0.4286 0.0042 2321 20.4 2299 19 99 17N06-48 200 236 131 1.81 0.1114 0.0016 5.1811 0.1107 0.3358 0.0060 1833 27.3 1867 29 99 17N06-49 281 360 135 2.67 0.1126 0.0018 5.1927 0.0925 0.3332 0.0044 1843 29.8 1854 21 99 17N06-50 481 625 226 2.77 0.1114 0.0016 5.1309 0.0865 0.3328 0.0045 1822 25.3 1852 22 99 17N06-51 303 225 355 0.63 0.1179 0.0017 5.8905 0.0963 0.3603 0.0034 1924 25.8 1983 16 98 17N06-52 386 255 346 0.74 0.1477 0.0016 8.6909 0.1096 0.4250 0.0041 2320 18.4 2283 19 99 17N06-53 116 121 112 1.08 0.1107 0.0014 4.9282 0.0683 0.3219 0.0030 1810 24.1 1799 14 99 17N06-54 146 175 94.6 1.85 0.1137 0.0023 5.1900 0.1284 0.3303 0.0065 1861 31.0 1840 31 99 17N06-55 275 219 242 0.90 0.1330 0.0016 7.2153 0.0850 0.3933 0.0041 2139 21.0 2138 19 99 17N06-56 492 347 317 1.10 0.1511 0.0023 8.9095 0.1966 0.4251 0.0067 2358 25.3 2284 30 98 17N06-57 278 186 373 0.50 0.1170 0.0014 5.8369 0.0867 0.3606 0.0042 1922 16.2 1985 20 98 17N06-58 249 305 150 2.03 0.1124 0.0017 5.1933 0.0927 0.3343 0.0044 1839 25.8 1859 21 99 17N06-59 211 233 129 1.80 0.1185 0.0014 5.8686 0.1162 0.3584 0.0062 1944 16.5 1975 30 99 17N06-60 442 324 301 1.07 0.1544 0.0017 9.5808 0.1187 0.4490 0.0038 2395 18.5 2391 17 99 17N06-61 271 352 134 2.62 0.1118 0.0018 5.1183 0.1039 0.3319 0.0055 1828 29.2 1848 27 99 17N06-62 493 629 242 2.60 0.1144 0.0014 5.2800 0.0907 0.3338 0.0042 1870 23.6 1857 20 99 17N06-63 319 291 345 0.84 0.1200 0.0014 5.7629 0.0936 0.3471 0.0040 1967 26.7 1921 19 98 
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表 2 叠布斯格岩群黑云钾长片麻岩(D791-1)SHRIMP锆石U-Th-Pb分析结果
Table 2. SHRIMP zircon U-Th-Pb data of the biotite K-feldspar gneiss (D791-1) from the Diebusige Complex
样品点号 含量/10-6 Th/U 同位素比值 年龄/Ma Pb Th U 207Pb/206Pb 1σ/% 207Pb/235U 1σ/% 206Pb/238U 1σ/% 207Pb/206Pb 1σ D791-1-1 71.2 148 246 0.62 0.1139 1.40 5.253 1.90 0.3346 1.20 1862 25 D791-1-2 154 35 487 0.07 0.12170 0.57 6.185 1.30 0.3686 1.10 1981 10 D791-1-3 15.1 62 53 1.22 0.1088 8.90 4.89 9.20 0.3261 2.00 1778 160 D791-1-4 102 120 232 0.53 0.1744 0.64 12.26 1.40 0.5100 1.20 2601 11 D791-1-5 13.2 3 42 0.07 0.1284 4.20 6.39 4.60 0.3611 1.80 2076 74 D791-1-6 24.9 94 86 1.14 0.1094 2.60 5.04 3.00 0.3343 1.50 1789 48 D791-1-7 122 123 309 0.41 0.16307 0.54 10.33 1.30 0.4595 1.20 2488 9.1 D791-1-8 62.7 26 172 0.16 0.1453 1.20 8.41 1.80 0.4197 1.30 2291 21 D791-1-9 174 88 565 0.16 0.1201 0.86 5.884 1.50 0.3555 1.20 1957 15 D791-1-10 37.1 159 124 1.32 0.1134 2.00 5.36 2.40 0.3433 1.50 1853 36 D791-1-11 173 220 405 0.56 0.17257 0.50 11.79 1.30 0.4953 1.20 2583 8.4 D791-1-12 39.3 70 139 0.52 0.1159 1.20 5.227 1.90 0.3270 1.50 1895 22 D791-1-13 64.8 2 201 0.01 0.1215 1.10 6.24 1.70 0.3728 1.30 1978 20 D791-1-14 16.2 51 54 0.98 0.1097 5.10 5.04 5.40 0.3334 1.80 1792 93 D791-1-15 35.6 64 116 0.57 0.1200 3.10 5.81 3.40 0.3511 1.40 1956 56
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表 3 叠布斯格岩群角闪斜长片麻岩(17N02-5)与黑云斜长片麻岩(17N06)锆石原位Lu-Hf同位素组成
Table 3. Zircon in-situ Lu-Hf isotopic compositions of the amphibole plagio-gneiss (17N02-5) and the biotite plagioclase gneiss (17N06) from the Diebusige Complex
点号 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 2σ 年龄/Ma (176Hf/177Hf)i εHf(0) εHf(t) 2σ TDM/Ma TDM2/Ma fLu/Hf 角闪斜长片麻岩 17N02-5-01 0.03660 0.00078 0.28131 0.000041 2350 0.281277 -51.6 -0.22 1.46 2691 2898 -0.97645 17N02-5-02 0.00942 0.00020 0.28132 0.000043 1847 0.281311 -51.4 -10.52 1.53 2643 3146 -0.99386 17N02-5-03 0.08220 0.00165 0.28124 0.000051 2327 0.281166 -54.2 -4.68 1.81 2853 3153 -0.95042 17N02-5-04 0.01656 0.00035 0.28132 0.000044 1843 0.281305 -51.5 -10.84 1.56 2654 3162 -0.98951 17N02-5-05 0.01780 0.00040 0.28116 0.000052 2202 0.281142 -57.0 -8.39 1.85 2869 3285 -0.98810 17N02-5-06 0.04940 0.00099 0.28121 0.000051 2085 0.281173 -55.2 -10.00 1.81 2841 3294 -0.97032 17N02-5-08 0.06600 0.00136 0.28126 0.000057 2478 0.281190 -53.6 -0.34 2.03 2810 3004 -0.95892 17N02-5-10 0.05890 0.00125 0.28121 0.000056 2224 0.281153 -55.4 -7.52 1.99 2869 3248 -0.96226 17N02-5-11 0.08219 0.00167 0.28124 0.000064 1798 0.281184 -54.1 -16.14 2.27 2853 3453 -0.94958 17N02-5-14 0.04155 0.00084 0.28126 0.000057 1902 0.281227 -53.6 -12.27 2.02 2769 3294 -0.97466 17N02-5-12 0.04456 0.00102 0.28136 0.000040 1835 0.281320 -50.1 -10.45 1.42 2648 3133 -0.96921 17N02-5-13 0.01867 0.00039 0.28135 0.000035 1828 0.281332 -50.4 -10.19 1.24 2618 3111 -0.98821 17N02-5-15 0.04661 0.00097 0.28122 0.000044 1833 0.281182 -55.0 -15.40 1.56 2834 3434 -0.97087 17N02-5-16 0.00355 0.00007 0.28136 0.000044 1840 0.281354 -50.1 -9.17 1.56 2583 3058 -0.99798 17N02-5-19 0.04200 0.00089 0.28132 0.000046 2310 0.281279 -51.4 -1.08 1.64 2690 2920 -0.97310 17N02-5-21 0.01939 0.00042 0.28140 0.000044 1847 0.281384 -48.6 -7.91 1.56 2549 2986 -0.98746 17N02-5-20 0.03576 0.00078 0.28124 0.000044 2128 0.281212 -54.0 -7.62 1.56 2783 3181 -0.97639 17N02-5-22 0.00969 0.00019 0.28136 0.000051 2052 0.281356 -49.8 -4.24 1.81 2581 2916 -0.99419 17N02-5-23 0.01823 0.00043 0.28136 0.000049 1851 0.281344 -50.0 -9.26 1.74 2603 3071 -0.98711 17N02-5-25 0.06659 0.00144 0.28127 0.000055 2454 0.281198 -53.3 -0.64 1.96 2802 3004 -0.95669 17N02-5-26 0.03189 0.00062 0.28138 0.000044 1869 0.281356 -49.3 -8.41 1.56 2591 3034 -0.98120 17N02-5-27 0.02602 0.00058 0.28139 0.000044 1933 0.281364 -49.1 -6.69 1.56 2578 2976 -0.98250 17N02-5-29 0.01861 0.00043 0.28144 0.000045 1850 0.281422 -47.2 -6.51 1.60 2498 2902 -0.98702 17N02-5-33 0.04526 0.00101 0.28124 0.000064 2474 0.281189 -54.3 -0.48 2.28 2809 3009 -0.96957 17N02-5-35 0.02140 0.00046 0.28133 0.000044 1835 0.281310 -51.1 -10.82 1.56 2649 3155 -0.98626 17N02-5-36 0.02710 0.00057 0.28118 0.000056 2381 0.281154 -56.3 -3.87 1.99 2853 3145 -0.98292 17N02-5-37 0.01430 0.00031 0.28129 0.000039 1883 0.281282 -52.3 -10.73 1.39 2683 3186 -0.99073 17N02-5-38 0.03497 0.00075 0.28122 0.000042 2161 0.281184 -55.1 -7.84 1.49 2819 3220 -0.97747 17N02-5-39 0.01789 0.00040 0.28141 0.000044 1858 0.281394 -48.2 -7.32 1.56 2535 2958 -0.98793 17N02-5-41 0.04594 0.00102 0.28126 0.000055 2551 0.281210 -53.5 2.05 1.96 2778 2914 -0.96922 17N02-5-42 0.06232 0.00126 0.28124 0.000047 2351 0.281184 -54.1 -3.49 1.67 2822 3098 -0.96192 17N02-5-43 0.02065 0.00048 0.28132 0.000042 2106 0.281302 -51.3 -4.93 1.49 2658 3000 -0.98560 17N02-5-44 0.12680 0.00249 0.28135 0.000066 2429 0.281231 -50.4 -0.01 2.35 2766 2946 -0.92494 17N02-5-45 0.03560 0.00079 0.28131 0.000056 2228 0.281274 -51.8 -3.12 1.99 2697 2982 -0.97611 17N02-5-46 0.05033 0.00106 0.28123 0.000056 2409 0.281178 -54.6 -2.35 1.99 2826 3074 -0.96819 17N02-5-47 0.04008 0.00093 0.28122 0.000049 2265 0.281181 -54.8 -5.58 1.74 2825 3161 -0.97199 17N02-5-49 0.01497 0.00035 0.28132 0.000050 1850 0.281311 -51.2 -10.45 1.78 2646 3144 -0.98953 17N02-5-51 0.01748 0.00038 0.28133 0.000052 1987 0.281312 -51.1 -7.30 1.85 2644 3054 -0.98867 17N02-5-50 0.00150 0.00003 0.28125 0.000049 1832 0.281249 -53.8 -13.05 1.74 2722 3290 -0.99910 17N02-5-52 0.03630 0.00077 0.28149 0.000043 1894 0.281464 -45.3 -4.00 1.53 2446 2781 -0.97672 17N02-5-53 0.01692 0.00041 0.28135 0.000043 1856 0.281336 -50.3 -9.44 1.53 2614 3086 -0.98780 17N02-5-54 0.01414 0.00033 0.28131 0.000040 1872 0.281300 -51.6 -10.33 1.42 2660 3153 -0.98997 17N02-5-55 0.01317 0.00031 0.28138 0.000040 1958 0.281363 -49.4 -6.12 1.42 2574 2960 -0.99065 17N02-5-57 0.03294 0.00076 0.28123 0.000052 1911 0.281200 -54.6 -12.99 1.85 2803 3346 -0.97708 17N02-5-58 0.01439 0.00033 0.28143 0.000043 1884 0.281415 -47.6 -5.96 1.53 2505 2894 -0.99017 17N02-5-59 0.02605 0.00065 0.28137 0.000041 1937 0.281343 -49.7 -7.34 1.46 2607 3019 -0.98038 17N02-5-60 0.01471 0.00035 0.28137 0.000045 1740 0.281359 -49.6 -11.26 1.60 2583 3111 -0.98961 17N02-5-61 0.02151 0.00053 0.28137 0.000044 1861 0.281347 -49.7 -8.90 1.56 2601 3058 -0.98401 17N02-5-62 0.04824 0.00108 0.28130 0.000047 2047 0.281253 -52.2 -8.01 1.67 2735 3143 -0.96759 17N02-5-63 0.02751 0.00064 0.28144 0.000041 1855 0.281413 -47.3 -6.72 1.46 2514 2919 -0.98078 黑云斜长片麻岩 17N06-01 0.01069 0.00022 0.28139 0.000037 1909 0.281385 -48.8 -6.47 1.31 2544 2944 -0.99346 17N06-02 0.00327 0.00007 0.28131 0.000042 1854 0.281303 -51.9 -10.67 1.49 2651 3160 -0.99788 17N06-03 0.02824 0.00066 0.28121 0.000044 1922 0.281186 -55.2 -13.24 1.56 2819 3369 -0.98027 17N06-04 0.01253 0.00033 0.28123 0.000041 1806 0.281215 -54.7 -14.89 1.46 2775 3382 -0.98991 17N06-05 0.04100 0.00086 0.28142 0.000069 1865 0.281391 -47.7 -7.26 2.45 2547 2959 -0.97402 17N06-06 0.01344 0.00032 0.28133 0.000049 1916 0.281317 -51.0 -8.72 1.74 2636 3088 -0.99022 17N06-07 0.00772 0.00018 0.28136 0.000045 1833 0.281352 -50.0 -9.39 1.60 2588 3066 -0.99465 17N06-08 0.02691 0.00057 0.28137 0.000067 1831 0.281353 -49.5 -9.38 2.38 2594 3064 -0.98277 17N06-09 0.01812 0.00043 0.28129 0.000047 1917 0.281275 -52.4 -10.19 1.67 2694 3179 -0.98717 17N06-11 0.00284 0.00006 0.28143 0.000031 1896 0.281428 -47.5 -5.25 1.10 2484 2860 -0.99813 17N06-12 0.03923 0.00084 0.28121 0.000042 2327 0.281169 -55.4 -4.58 1.49 2838 3148 -0.97461 17N06-13 0.04580 0.00095 0.28138 0.000078 1803 0.281344 -49.3 -10.33 2.77 2614 3101 -0.97127 17N06-14 0.03034 0.00069 0.28128 0.000070 1829 0.281257 -52.7 -12.83 2.49 2726 3274 -0.97928 17N06-15 0.00862 0.00021 0.28136 0.000037 2231 0.281348 -50.0 -0.41 1.32 2591 2819 -0.99360 17N06-16 0.04066 0.00085 0.28140 0.000067 1836 0.281372 -48.4 -8.59 2.38 2573 3019 -0.97441 17N06-17 0.00150 0.00003 0.28128 0.000045 1818 0.281278 -52.8 -12.36 1.60 2683 3237 -0.99911 17N06-18 0.02394 0.00050 0.28127 0.000041 1800 0.281251 -53.2 -13.72 1.46 2730 3307 -0.98500 17N06-19 0.02926 0.00067 0.28117 0.000051 2183 0.281141 -56.7 -8.87 1.81 2876 3300 -0.97978 17N06-20 0.06732 0.00151 0.28122 0.000054 2415 0.281151 -54.8 -3.19 1.92 2868 3129 -0.95452 17N06-21 0.04337 0.00084 0.28138 0.000055 1857 0.281349 -49.3 -8.92 1.95 2604 3056 -0.97466 17N06-22 0.05267 0.00119 0.28120 0.000048 2021 0.281158 -55.5 -11.98 1.71 2867 3366 -0.96404 17N06-23 0.01515 0.00031 0.28137 0.000048 1831 0.281356 -49.7 -9.27 1.70 2585 3058 -0.99054 17N06-24 0.01454 0.00034 0.28128 0.000046 1840 0.281268 -52.8 -12.19 1.63 2703 3244 -0.98965 17N06-26 0.02728 0.00062 0.28123 0.000052 1769 0.281207 -54.6 -15.99 1.85 2793 3422 -0.98120 17N06-25 0.03798 0.00079 0.28115 0.000044 2406 0.281115 -57.3 -4.70 1.56 2909 3214 -0.97630 17N06-29 0.01909 0.00044 0.28128 0.000047 1835 0.281266 -52.7 -12.40 1.67 2709 3252 -0.98672 17N06-32 0.03405 0.00072 0.28116 0.000040 2320 0.281131 -56.9 -6.08 1.42 2887 3233 -0.97843 17N06-33 0.00682 0.00015 0.28130 0.000055 1744 0.281291 -52.2 -13.57 1.95 2669 3256 -0.99537 17N06-35 0.03206 0.00072 0.28115 0.000057 2280 0.281119 -57.4 -7.45 2.03 2905 3286 -0.97836 17N06-36 0.01323 0.00028 0.28138 0.000054 1854 0.281365 -49.4 -8.44 1.92 2571 3023 -0.99171 17N06-40 0.03034 0.00071 0.28120 0.000047 2221 0.281168 -55.7 -7.06 1.67 2839 3217 -0.97866 17N06-42 0.00893 0.00019 0.28136 0.000051 1754 0.281356 -49.9 -11.05 1.81 2583 3108 -0.99441 17N06-44 0.03469 0.00087 0.28138 0.000056 1939 0.281344 -49.4 -7.24 1.99 2610 3015 -0.97392 17N06-45 0.01350 0.00028 0.28130 0.000044 1854 0.281285 -52.2 -11.28 1.56 2679 3198 -0.99164 17N06-47 0.01887 0.00042 0.28114 0.000044 2317 0.281124 -57.6 -6.43 1.56 2893 3252 -0.98740 17N06-49 0.02670 0.00049 0.28132 0.000052 1856 0.281305 -51.3 -10.55 1.85 2657 3154 -0.98524 17N06-50 0.04541 0.00089 0.28139 0.000072 1817 0.281361 -48.8 -9.42 2.56 2590 3056 -0.97312 17N06-51 0.03030 0.00062 0.28125 0.000047 1947 0.281231 -53.7 -11.08 1.67 2757 3256 -0.98139 17N06-55 0.03314 0.00072 0.28114 0.000053 2135 0.281115 -57.6 -10.92 1.88 2913 3388 -0.97836 17N06-57 0.01227 0.00029 0.28135 0.000039 1902 0.281344 -50.1 -8.12 1.39 2600 3040 -0.99133 17N06-59 0.03053 0.00061 0.28120 0.000049 1928 0.281180 -55.5 -13.33 1.74 2827 3379 -0.98175 17N06-61 0.01982 0.00038 0.28135 0.000047 1822 0.281336 -50.3 -10.21 1.67 2613 3108 -0.98850 17N06-62 0.03170 0.00057 0.28136 0.000072 1887 0.281337 -50.0 -8.70 2.56 2615 3064 -0.98283
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