Zircon U−Pb ages and Hf isotopic compositions of river sediments from the Gonghe Basin and implication on tectonics and evolution of the crust
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摘要:
为揭示青海共和盆地沉积源区构造活动和地壳演化历史,应用LA-MC-ICP-MS技术,对共和盆地曲什安河与西河河漫滩沉积物中的碎屑锆石进行了U−Pb定年和Hf同位素分析。得出碎屑锆石U−Pb年龄可分为5组:309~172 Ma、471~368 Ma、943~737 Ma、2368~1698 Ma、2543~2453 Ma。结合研究区构造−岩浆事件得出,曲什安河与西河河漫滩碎屑沉积物是西秦岭地块在不同时期提供的结果。碎屑锆石U−Pb年龄存在2个主要峰值,约236 Ma和约403 Ma,反映了古特提斯洋和原特提斯洋在不同部分的俯冲导致陆块碰撞,形成强烈岩浆事件的地质记录,碰撞后伸展阶段出现裂谷和新生洋盆。Hf同位素组成特征揭示,源区地壳在2.7~1.3 Ga经历了主要增生期,形成现今地壳的84%。εHf(t)值为 −14.7~+15.0,Hf亏损模式年龄在3.6~0.24 Ga范围内,表明源区基底存在古太古代古老地壳物质。约0.5 Ga以来,地壳增长以古老地壳物质再循环为主,并在0.28 Ga左右地壳停止了生长。依据前人公式计算了曲什安河与西河河漫滩碎屑沉积物物源区各时期的重熔/增生比例。
Abstract:To reveal the history of tectonic activity and crustal evolution in the sedimentary source area of the Gonghe Basin, U−Pb dating and Hf isotope analysis of detrital zircons in the floodplain sediments of the Qushian river and Xi river in the Gonghe Basin were analyzed by LA−MC−ICP−MS approach in this study. It was revealed that the U−Pb age of these detrital zircons can be divided into 5 groups: 309~172 Ma, 471~368 Ma, 943~737 Ma, 2368~1698 Ma, 2543~2453 Ma.According to the tectonic−magmatic events in the study area, it is concluded that the detrital sediments of the floodplains of the Qushian River and Xi River are provided by the Western Qinling block at different times. There are two main detrital zircon U−Pb ages, 236 Ma and 403 Ma, reflecting the geological record of the collision of blocks in different parts of the paleo and proto−Tethys oceans, induced strong magmatic events, and the emergence of rift valleys and neonatal ocean basins in the post−collision extension stage. The features of Hf isotopic composition revealed that the crust in the source area underwent a major accretion period at 2.7~1.3 Ga, and created 84% of the current crust. εHf(t) value ranges between −14.7 and +15.0, Hf depleted mode age in the range of 3.6~0.24 Ga, indicating the presence of Paleoarchean ancient crust substance in the source area substrata. Since 0.5 Ga, the growth of the earth's crust has mainly been dominated by the recycling of ancient crust substance, and the growth of the crust has stopped at 0.28 Ga. Furthermore, using formula of recycling ratio, ratios between remelting and juvenile crust with age have been calculated.
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Key words:
- Gonghe Basin /
- detrital zircons /
- U−Pb age /
- Lu-Hf isotopes /
- continental crust growth
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图 1 共和盆地及相邻地区地质简图(据Li et al.,2019修改)
Figure 1.
图 2 共和盆地周围多阶段侵入体、前寒武纪—三叠纪地层和样本位置简化地质图(据Li et al., 2019修改)
Figure 2.
图 7 共和盆地河流碎屑锆石年龄−εHf(t)关系图(a)与Hf亏损模式年龄分布直方图(b)(a数据据Luo et al.,2012; Sun et al.,2013; Chen et al.,2014;Li et al.,2014, 2020)
Figure 7.
图 8 共和盆地周围前寒武纪—三叠纪不同地层沉积岩碎屑锆石U−Pb年龄(a~c)及相邻地块(d~f)分布模式对比图(数据据Kang et al.,2018;Li et al.,2019;高翔宇,2019;梁国冰,2019;宋志杰等,2019;高奕霖,2021;孙郎等,2022;张帅等,2022;)
Figure 8.
图 9 西秦岭地块构造演化历史示意图(据Dong et al.,2011; Li et al.,2019)
Figure 9.
表 1 样品HHZ0730-3S和QS0729S碎屑锆石U−Th−Pb同位素数据
Table 1. U−Th−Pb isotopic data of detrital zircons from sample HHZ0730-3S and QS0729S
测点号 含量/10−6 Th/U 同位素比值 年龄/Ma 谐和度/% Th Pb U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ HHZ0730-3S(36°01.333′ N、101°24.285′E) 1 44 18 48 0.92 0.1070 0.0029 4.1929 0.1165 0.2853 0.0040 1750 50 1673 23 1618 20 108 2 67 55 93 0.72 0.1600 0.0026 9.8798 0.1802 0.4474 0.0051 2457 27 2424 17 2384 23 103 3 324 39 940 0.34 0.0557 0.0013 0.2835 0.0066 0.0370 0.0004 439 56 253 5 234 2 108 4 291 261 671 0.43 0.1193 0.0014 5.2921 0.0680 0.3212 0.0027 1946 22 1868 11 1796 13 108 5 211 21 473 0.45 0.0553 0.0017 0.2870 0.0089 0.0378 0.0004 433 75 256 7 239 3 107 6 318 58 654 0.49 0.0573 0.0012 0.5905 0.0117 0.0749 0.0006 502 44 471 7 466 4 101 7 7 9 25 0.27 0.1133 0.0037 4.8550 0.1712 0.3128 0.0058 1853 64 1794 30 1754 28 106 8 235 22 510 0.46 0.0517 0.0017 0.2661 0.0088 0.0373 0.0004 272 76 240 7 236 2 101 9 95 89 442 0.22 0.0787 0.0012 1.9411 0.0340 0.1786 0.0020 1165 31 1095 12 1060 11 109 11 278 31 718 0.39 0.0515 0.0014 0.2659 0.0070 0.0375 0.0004 265 56 239 6 237 2 101 14 184 22 506 0.36 0.0526 0.0019 0.2708 0.0096 0.0374 0.0004 322 81 243 8 237 2 103 17 62 37 413 0.15 0.0610 0.0013 0.7200 0.0275 0.0846 0.0023 639 45 551 16 523 14 105 19 433 55 581 0.75 0.0560 0.0013 0.5801 0.0142 0.0751 0.0008 454 54 465 9 467 5 99 20 172 14 300 0.57 0.0472 0.0021 0.2424 0.0100 0.0377 0.0006 61 100 220 8 239 4 92 22 66 42 389 0.17 0.0634 0.0013 0.8416 0.0198 0.0960 0.0009 720 44 620 11 591 5 105 23 361 47 1091 0.33 0.0526 0.0014 0.2694 0.0074 0.0371 0.0004 322 59 242 6 235 2 103 24 105 64 155 0.68 0.1114 0.0018 4.9527 0.0961 0.3220 0.0038 1833 29 1811 16 1799 18 102 25 61 33 75 0.81 0.1136 0.0026 5.0044 0.1229 0.3193 0.0034 1857 41 1820 21 1786 17 104 28 41 4 63 0.65 0.0602 0.0036 0.3948 0.0227 0.0490 0.0010 609 134 338 17 309 6 109 30 68 34 82 0.83 0.1119 0.0026 4.6431 0.1123 0.3005 0.0032 1831 43 1757 20 1694 16 108 31 177 25 563 0.31 0.0526 0.0020 0.2737 0.0103 0.0377 0.0004 322 81 246 8 239 3 103 32 101 10 183 0.55 0.0579 0.0025 0.3509 0.0154 0.0442 0.0006 528 96 305 12 279 4 109 35 59 41 97 0.61 0.1235 0.0023 5.5676 0.1018 0.3276 0.0030 2007 33 1911 16 1827 15 110 37 308 264 511 0.60 0.1425 0.0017 7.9425 0.1052 0.4040 0.0034 2258 21 2225 12 2187 15 103 38 107 53 168 0.64 0.0937 0.0017 3.2375 0.0595 0.2515 0.0027 1502 35 1466 14 1446 14 104 39 84 15 166 0.51 0.0550 0.0022 0.5710 0.0218 0.0757 0.0010 413 87 459 14 471 6 97 40 115 14 198 0.58 0.0561 0.0021 0.4518 0.0168 0.0588 0.0007 457 116 379 12 368 4 103 41 656 39 647 1.01 0.0539 0.0014 0.3384 0.0090 0.0455 0.0004 369 64 296 7 287 3 103 42 273 46 1158 0.24 0.0484 0.0011 0.2471 0.0057 0.0371 0.0004 117 56 224 5 235 2 95 43 66 11 13 5.27 0.1207 0.0056 5.6829 0.2532 0.3534 0.0070 1966 83 1929 38 1951 33 101 44 143 11 237 0.61 0.0540 0.0023 0.2768 0.0114 0.0373 0.0005 372 94 248 9 236 3 105 45 174 14 361 0.48 0.0504 0.0020 0.2316 0.0097 0.0334 0.0004 213 90 212 8 212 3 100 46 110 34 66 1.66 0.1225 0.0025 5.4935 0.1283 0.3248 0.0042 1994 31 1900 20 1813 20 110 47 40 54 99 0.40 0.1519 0.0029 9.3825 0.1936 0.4475 0.0049 2369 28 2376 19 2384 22 99 48 504 33 731 0.69 0.0521 0.0014 0.2640 0.0071 0.0368 0.0003 300 58 238 6 233 2 102 49 192 264 549 0.35 0.1509 0.0020 8.2870 0.1193 0.3976 0.0038 2367 22 2263 13 2158 17 110 50 341 30 783 0.44 0.0534 0.0015 0.2375 0.0065 0.0323 0.0003 343 63 216 5 205 2 105 51 227 31 744 0.31 0.0523 0.0013 0.2653 0.0068 0.0367 0.0004 298 56 239 5 233 3 103 52 33 21 278 0.12 0.0577 0.0016 0.5531 0.0173 0.0690 0.0008 520 66 447 11 430 5 104 53 131 58 137 0.96 0.1076 0.0018 4.5390 0.0915 0.3059 0.0042 1759 31 1738 17 1720 21 102 54 33 44 77 0.43 0.1647 0.0029 10.1914 0.1780 0.4492 0.0049 2505 63 2452 16 2392 22 105 55 297 58 1407 0.21 0.0523 0.0014 0.2659 0.0069 0.0368 0.0004 298 64 239 6 233 3 103 57 82 61 362 0.23 0.0714 0.0013 1.4317 0.0269 0.1452 0.0014 969 37 902 11 874 8 103 59 148 137 293 0.50 0.1317 0.0021 6.6584 0.1470 0.3641 0.0049 2120 28 2067 19 2002 23 106 60 134 108 223 0.60 0.1273 0.0019 6.4927 0.1178 0.3697 0.0050 2061 26 2045 16 2028 24 102 61 89 10 113 0.78 0.0578 0.0031 0.5573 0.0301 0.0698 0.0009 524 84 450 20 435 5 103 63 496 88 2341 0.21 0.0549 0.0010 0.2491 0.0042 0.0329 0.0003 409 41 226 3 209 2 108 64 380 49 533 0.71 0.0561 0.0014 0.5412 0.0132 0.0699 0.0007 457 21 439 9 436 4 101 65 121 6 118 1.02 0.0531 0.0035 0.2762 0.0192 0.0378 0.0007 332 152 248 15 239 4 103 69 146 104 264 0.56 0.1140 0.0018 4.8570 0.0828 0.3083 0.0028 1865 28 1795 14 1732 14 108 70 67 10 113 0.60 0.0626 0.0040 0.6047 0.0385 0.0702 0.0015 696 136 480 24 437 9 110 71 6 20 57 0.11 0.1105 0.0027 4.8329 0.1347 0.3171 0.0049 1809 46 1791 23 1775 24 102 77 52 223 582 0.09 0.1227 0.0015 5.7241 0.0737 0.3372 0.0025 1996 22 1935 11 1873 12 107 78 1139 72 1549 0.74 0.0522 0.0010 0.2684 0.0053 0.0372 0.0004 295 47 241 4 236 2 102 QS0729S(35°19.627′N、100°13.828′E) 5 62 142 990 0.06 0.0710 0.0011 1.2819 0.0285 0.1303 0.0018 958 31 838 13 789 10 106 8 203 94 236 0.86 0.1052 0.0015 3.9962 0.0651 0.2751 0.0024 1717 22 1633 13 1566 12 110 12 216 25 286 0.76 0.0602 0.0020 0.5316 0.0168 0.0646 0.0009 609 40 433 11 404 6 107 13 86 102 481 0.18 0.0783 0.0013 1.9199 0.0338 0.1776 0.0018 1154 33 1088 12 1054 10 109 14 137 28 153 0.89 0.0666 0.0019 1.2044 0.0362 0.1309 0.0015 833 59 803 17 793 9 101 15 115 26 321 0.36 0.0596 0.0021 0.5232 0.0184 0.0638 0.0007 587 80 427 12 399 4 107 16 184 196 328 0.56 0.1599 0.0019 9.7685 0.1511 0.4415 0.0051 2455 20 2413 14 2357 23 104 18 62 32 181 0.34 0.0764 0.0022 1.5234 0.0436 0.1454 0.0020 1106 53 940 18 875 11 107 19 125 10 103 1.21 0.0540 0.0042 0.4699 0.0351 0.0633 0.0016 369 206 391 24 396 10 99 21 181 41 287 0.63 0.0647 0.0016 0.9710 0.0249 0.1084 0.0013 765 47 689 13 663 8 104 22 187 31 379 0.49 0.0573 0.0019 0.5183 0.0191 0.0652 0.0010 506 74 424 13 407 6 104 23 81 25 118 0.68 0.0778 0.0023 1.6868 0.0555 0.1565 0.0025 1143 60 1004 21 937 14 107 24 173 18 205 0.85 0.0606 0.0028 0.5312 0.0217 0.0643 0.0011 633 100 433 14 401 7 108 25 81 83 442 0.18 0.0727 0.0013 1.5850 0.0271 0.1576 0.0015 1006 35 964 11 943 8 102 26 119 9 203 0.59 0.0526 0.0026 0.2533 0.0121 0.0352 0.0005 309 113 229 10 223 3 103 27 184 26 307 0.60 0.0578 0.0017 0.5227 0.0168 0.0652 0.0009 524 65 427 11 407 6 105 28 198 177 264 0.75 0.1622 0.0021 10.6209 0.1840 0.4729 0.0063 2480 21 2491 16 2496 27 99 29 12 9 17 0.69 0.1338 0.0050 6.7103 0.2505 0.3685 0.0066 2148 66 2074 33 2022 31 106 30 273 22 385 0.71 0.0560 0.0018 0.3261 0.0105 0.0422 0.0005 450 66 287 8 266 3 108 31 388 552 1641 0.24 0.1077 0.0013 4.3234 0.0572 0.2907 0.0024 1761 21 1698 11 1645 12 107 32 170 72 260 0.65 0.0857 0.0014 2.5847 0.0466 0.2182 0.0020 1331 30 1296 13 1272 11 105 33 67 96 344 0.19 0.0909 0.0013 3.0904 0.0491 0.2464 0.0023 1456 28 1430 12 1420 12 103 34 51 66 119 0.42 0.1599 0.0020 9.6861 0.1666 0.4384 0.0053 2455 22 2405 16 2343 24 105 35 72 49 287 0.25 0.0735 0.0012 1.5217 0.0273 0.1499 0.0010 1028 33 939 11 900 6 104 37 23 25 64 0.35 0.1182 0.0025 5.2071 0.1173 0.3200 0.0039 1931 39 1854 19 1790 19 108 40 36 11 27 1.32 0.1056 0.0035 4.0675 0.1460 0.2811 0.0053 1725 61 1648 29 1597 27 108 41 28 25 53 0.53 0.1387 0.0028 7.2282 0.1576 0.3794 0.0052 2211 40 2140 19 2073 24 107 42 131 150 285 0.46 0.1597 0.0020 9.2984 0.1533 0.4217 0.0051 2454 21 2368 15 2268 23 108 43 109 18 112 0.97 0.0697 0.0021 1.1553 0.0332 0.1211 0.0014 918 67 780 16 737 8 106 44 310 17 289 1.07 0.0519 0.0021 0.3002 0.0116 0.0423 0.0005 280 93 267 9 267 3 100 50 176 13 249 0.71 0.0557 0.0042 0.3110 0.0231 0.0408 0.0009 439 175 275 18 258 5 107 51 55 60 105 0.52 0.1485 0.0021 9.2520 0.1407 0.4518 0.0047 2329 24 2363 14 2403 21 97 55 136 18 222 0.61 0.0564 0.0028 0.5039 0.0273 0.0643 0.0010 465 109 414 18 402 6 103 56 84 10 174 0.48 0.0499 0.0023 0.3300 0.0151 0.0481 0.0007 191 107 290 12 303 4 96 57 94 85 217 0.43 0.1040 0.0013 4.7582 0.0845 0.3314 0.0045 1698 24 1778 15 1845 22 92 58 105 89 202 0.52 0.1279 0.0018 6.2011 0.0889 0.3516 0.0028 2069 25 2005 13 1942 13 107 60 316 16 346 0.91 0.0495 0.0016 0.2460 0.0087 0.0361 0.0004 169 78 223 7 228 3 98 64 46 35 76 0.60 0.1243 0.0023 6.2225 0.1196 0.3639 0.0041 2020 32 2008 17 2001 19 101 65 72 15 80 0.90 0.0745 0.0029 1.4893 0.0595 0.1454 0.0025 1057 79 926 24 875 14 106 67 175 42 566 0.31 0.0558 0.0012 0.5049 0.0113 0.0656 0.0007 456 48 415 8 410 4 101 68 196 45 240 0.82 0.0691 0.0014 1.3811 0.0310 0.1447 0.0016 902 43 881 13 871 9 101 70 177 114 307 0.58 0.1057 0.0014 4.3601 0.0745 0.2981 0.0034 1728 24 1705 14 1682 17 103 71 318 54 702 0.45 0.0585 0.0013 0.5256 0.0121 0.0651 0.0007 550 48 429 8 407 4 105 73 75 51 104 0.72 0.1255 0.0020 6.4509 0.1186 0.3724 0.0045 2035 28 2039 16 2041 21 100 74 235 12 220 1.07 0.0517 0.0024 0.2816 0.0127 0.0398 0.0005 272 104 252 10 252 3 100 75 127 103 290 0.44 0.1039 0.0014 4.1937 0.0630 0.2920 0.0028 1695 25 1673 12 1651 14 103 76 349 10 263 1.33 0.0531 0.0024 0.1948 0.0082 0.0270 0.0004 332 99 181 7 172 2 105 77 126 15 288 0.44 0.0560 0.0020 0.3285 0.0116 0.0427 0.0005 450 81 288 9 270 3 107 78 74 37 76 0.97 0.1231 0.0023 5.9622 0.1148 0.3513 0.0043 2002 33 1970 17 1941 21 103 79 98 106 184 0.53 0.1683 0.0027 10.1134 0.1812 0.4343 0.0045 2543 27 2445 17 2325 20 109 81 556 30 632 0.88 0.0526 0.0018 0.2617 0.0090 0.0362 0.0006 322 80 236 7 229 4 103 82 84 29 55 1.51 0.1124 0.0023 5.2874 0.1199 0.3408 0.0044 1839 32 1867 19 1890 21 97 83 69 8 128 0.54 0.0561 0.0040 0.3740 0.0281 0.0480 0.0009 454 159 323 21 302 6 107 85 519 64 237 2.20 0.0703 0.0016 1.5282 0.0357 0.1573 0.0015 939 42 942 14 942 8 100 表 2 样品HHZ0730-3S和QS0729S碎屑锆石Lu−Hf同位素组成
Table 2. Lu−Hf isotopic compositions of the zircons from sample HHZ0730-3S and QS0729S
测点号 锆石年龄/Ma 176Yb/177Hf 2σ 176Lu/177Hf 2σ 176Hf/177Hf 2σ εHf(t) TCDM/Ma HHZ0730-3S(36°01.333′ N、101°24.285′E) 2 2457 0.0309 0.0001 0.0007 0.0000 0.2812 0.0000 −1.9 3034 3 234 0.0218 0.0002 0.0005 0.0000 0.2826 0.0000 −2.6 1426 4 1946 0.0297 0.0007 0.0007 0.0000 0.2812 0.0000 −14.7 3466 5 239 0.0387 0.0009 0.0010 0.0000 0.2825 0.0000 −3.2 1464 7 1853 0.0191 0.0001 0.0005 0.0000 0.2817 0.0000 1.1 2415 12 2468 0.0185 0.0003 0.0005 0.0000 0.2815 0.0000 8.1 2424 13 2510 0.0137 0.0001 0.0003 0.0000 0.2813 0.0000 3.5 2768 14 237 0.0221 0.0001 0.0005 0.0000 0.2824 0.0000 −7.4 1732 20 239 0.0417 0.0006 0.0010 0.0000 0.2824 0.0000 −8.2 1779 27 1891 0.0337 0.0002 0.0008 0.0000 0.2815 0.0000 −3.4 2711 28 309 0.0291 0.0001 0.0007 0.0000 0.2830 0.0000 13.0 487 32 279 0.0333 0.0001 0.0008 0.0000 0.2824 0.0000 −5.6 1648 34 2463 0.0273 0.0013 0.0006 0.0000 0.2816 0.0000 11.7 2176 36 1850 0.0284 0.0003 0.0006 0.0000 0.2815 0.0000 −3.7 2704 43 1966 0.0149 0.0001 0.0004 0.0000 0.2814 0.0000 −5.8 2949 46 1994 0.0114 0.0000 0.0003 0.0000 0.2812 0.0000 −11.1 3307 47 2369 0.0219 0.0000 0.0005 0.0000 0.2813 0.0000 1.6 2764 48 233 0.0221 0.0004 0.0006 0.0000 0.2826 0.0000 −1.6 1362 51 233 0.0391 0.0002 0.0010 0.0000 0.2826 0.0000 −2.9 1436 54 2505 0.0267 0.0006 0.0007 0.0000 0.2812 0.0000 1.0 2884 65 239 0.0657 0.0003 0.0018 0.0000 0.2826 0.0000 −0.8 1303 74 1892 0.0531 0.0002 0.0012 0.0000 0.2817 0.0000 1.1 2385 79 234 0.0847 0.0002 0.0024 0.0000 0.2827 0.0000 3.2 1040 QS0729S(35°19.627′ N、100°13.828′E) 13 1154 0.0178 0.0011 0.0005 0.0000 0.2824 0.0000 12.0 1186 16 2455 0.0356 0.0015 0.0009 0.0000 0.2812 0.0002 −2.1 3028 19 396 0.0444 0.0005 0.0010 0.0000 0.2823 0.0000 −8.7 1924 26 223 0.0401 0.0011 0.0009 0.0000 0.2825 0.0000 −5.4 1588 28 2480 0.0369 0.0015 0.0011 0.0000 0.2815 0.0001 7.6 2405 30 266 0.0633 0.0007 0.0015 0.0000 0.2826 0.0000 −1.6 1379 32 1331 0.0725 0.0019 0.0019 0.0000 0.2822 0.0001 6.7 1584 34 2455 0.0328 0.0004 0.0009 0.0000 0.2813 0.0000 0.4 2861 35 900 0.0591 0.0019 0.0014 0.0000 0.2824 0.0000 4.8 1425 39 1317 0.0526 0.0004 0.0013 0.0000 0.2822 0.0000 6.2 1642 40 1725 0.0223 0.0004 0.0005 0.0000 0.2816 0.0000 −2.3 2530 41 2211 0.0483 0.0008 0.0011 0.0000 0.2814 0.0000 −0.6 2739 51 2329 0.0313 0.0002 0.0007 0.0000 0.2814 0.0000 2.8 2643 60 228 0.0554 0.0043 0.0015 0.0001 0.2826 0.0005 −1.0 1311 62 404 0.0466 0.0001 0.0011 0.0000 0.2821 0.0000 −13.5 2231 64 2020 0.0312 0.0011 0.0009 0.0000 0.2814 0.0000 −5.6 2930 68 871 0.0426 0.0004 0.0015 0.0000 0.2826 0.0000 11.6 965 74 252 0.1003 0.0023 0.0032 0.0001 0.2831 0.0000 15.0 285 75 1695 0.0517 0.0008 0.0011 0.0000 0.2817 0.0000 −2.1 2451 76 172 0.0483 0.0017 0.0012 0.0000 0.2824 0.0000 −9.4 1801 82 1839 0.0272 0.0011 0.0006 0.0000 0.2813 0.0001 −10.8 3151 83 302 0.0397 0.0009 0.0009 0.0000 0.2823 0.0000 −8.6 1851 表 3 西秦岭和祁连地块岩浆岩体U−Pb年龄
Table 3. U−Pb ages of igneous rocks from west Qinling and Qilian block
地区 岩体 岩性 年龄/Ma 方法 资料来源 木勒尔−满丈岗 花岗闪长岩 224±2 TIMS 骆必继等,2013 黑马河岩体 花岗闪长岩 235±2 LA-ICP-MS 张宏飞等,2006 温泉岩体 花岗闪长岩 218±2 LA-ICP-MS 张宏飞等,2006 青海南山岩体 花岗闪长岩 238 LA-ICP-MS 郭安林等,2009 共和温泉岩体 花岗闪长岩 218±2 LA-ICP-MS 张宏飞等,2006 塔东岩体 花岗闪长岩 220±2 LA-ICP-MS Yang et al.,2015 西秦岭地块 花岗闪长岩 219±2 LA-ICP-MS 徐多勋等,2015 党川岩体 花岗岩 438±3 LA-ICP-MS 王婧等,2008 百花杂岩体 中粗粒辉长岩 434.6±1.5 LA-ICP-MS 裴先治等,2007 红花铺侵入体 英云闪长岩 450.5±1.8 LA-ICP-MS 王洪亮等,2006 唐藏岩体 石英闪长岩 454.7±1.9 LA-ICP-MS 陈隽璐等,2008 岩湾侵入体 含石榴子石二长花岗岩 414.3±1.9 LA-ICP-MS 王洪亮等,2009 流水沟杂岩体 变辉长岩、辉长闪长岩 507.5±3.0 TIMS 裴先治等,2005 柯柯里岩体 石英闪长岩 500±4.6 SHRIMP 吴才来等,2010 柯柯里岩体 斜长花岗岩 512±1.8 SHRIMP 吴才来等,2011 祁连地块 民乐窑沟岩体 花岗闪长岩 463.2±4.7 SHRIMP 吴才来等,2006 牛心山岩体 花岗岩 476.7±6.6 SHRIMP 吴才来等,2006 野马咀花岗岩 花岗岩 508.3±4.6 SHRIMP 吴才来等,2013 -
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