LA-ICP-MS zircon U-Pb dating and Hf isotopic compositions of rocks from the Sushui complex in Shanxi-Shaanxi border area and their geological significance
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摘要:
涑水杂岩作为华北克拉通南部早前寒武纪变质基底杂岩的重要组成部分，以中条山地区出露最好且研究程度最高。在晋陕交界处的韩城和河津地区也有零星的古老变质基底杂岩出露，通常认为是中条山地区涑水杂岩的西延。用LA-ICP-MS锆石U-Pb方法测得研究区内的基底岩石角闪斜长片麻岩、透辉斜长片麻岩和二长花岗片麻岩原岩的形成年龄分别为2260±28Ma、2053±34Ma和2098±27Ma，表明晋陕交界处涑水杂岩的形成年龄明显小于中条山地区的涑水杂岩，其形成时代主要应为古元古代早期，而非太古宙。锆石Hf同位素显示，所分析的锆石多数具有低εHf(t) 值，最低可达-6，其二阶段模式年龄为2630~2933Ma，表明这些形成于古元古代的岩石为太古宙岩石再循环的产物，暗示在晋陕交界处可能存在太古宙的古老地壳物质，同时也支持华北克拉通南部太古宙地块划分的推论。
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关键词:
- 华北克拉通 /
- 涑水杂岩 /
- 基底岩石 /
- LA-ICP-MS锆石U-Pb年龄 /
- Hf同位素
Abstract:The Sushui complex is one of the main component parts of basement rocks in southern North China Craton (NCC). It is typically exposed in Zhongtiaoshan area and has been studied in detail. The Early Precambrian metamorphic basement complex rocks sporadically exposed in Shanxi-Shaanxi border area are traditionally regarded as the western extension and equivalents of Sushui complex in Zhongtiao region. LA-ICP-MS zircon U-Pb dating reveals that the protolithic ages of amphibolite-plagioclase gneiss, diopside-plagioclase gneiss and two-feldspar granite gneiss are 2260 ± 28Ma, 2053 ± 34Ma and 2098 ± 27Ma, respectively, significantly younger than the ages of rocks in Zhongtiaoshan area, suggesting that the Sushui complex was likely formed in Early Paleoproterozoic rather than in Archean. The majority of zircons of the samples have negative εHf(t) values (the lowerest being-6) with two-stage crustal model ages of 2630~2933Ma, which suggests that these samples were derived from recycled Mesoarchean to Neoarchean crust, and continental crustal materials as old as 2630~2933Ma probably preexisted in the Shanxi-Shaanxi border area. These results provide further evidence for the inference that the southern NCC was likely a coherent ancient terrane at the end of the Neoarchean.
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Keywords:
- North China Craton /
- Sushui complex /
- basement rocks /
- LA-ICP-MS zircon U-Pb ages /
- Hf isotope
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致谢: 感谢陕西省地质调查院李海平教授级高工和中国科学院地质与地球物理研究所樊龙刚博士在野外给予的帮助；感谢审稿专家提出的宝贵修改意见.
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图 3 晋陕交界涑水杂岩的锆石U-Pb年龄和Hf同位素组成
Figure 3. Zircon U-Pb dating and Hf isotopic compositions of rocks from the Sushui complex in Shanxi-Shaanxi border area
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图版Ⅰ a.河津市西磑口样品；b.韩城市阳山庄角闪斜长片麻岩；c.角闪斜长片麻岩；d.透辉斜长片麻岩；e.二长花片麻岩.Pl—斜长石；Mic—微斜长石；Di—透辉石；Amp—角闪石；Qz—石英；Mt—磁铁矿
表 1 晋陕交界涑水杂岩锆石U-Th-Pb年龄
Table 1 Zircon U-Th-Pb dating of the Sushui complex in Shanxi-Shaanxi border area
样品号 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 207Pb/235U 1σ 206Pb/238U 1σ 角闪斜长片麻岩 (12YSZ03) 12YSZ03-01 133 233 299 0.78 0.1397 0.0045 7.405 0.135 0.3847 0.0063 2223 54 2162 16 2098 29 12YSZ03-02 128 210 304 0.69 0.1416 0.0045 7.095 0.129 0.3637 0.0060 2247 54 2123 16 2000 28 12YSZ03-03 86 132 195 0.68 0.1435 0.0047 7.506 0.142 0.3797 0.0063 2269 55 2174 17 2075 29 12YSZ03-04 147 326 340 0.96 0.1421 0.0045 7.311 0.128 0.3732 0.0061 2253 54 2150 16 2045 28 12YSZ03-05 86 93 188 0.50 0.1439 0.0047 7.760 0.148 0.3913 0.0065 2275 55 2204 17 2129 30 12YSZ03-06 97 125 205 0.61 0.1433 0.0046 8.022 0.151 0.4062 0.0067 2268 55 2234 17 2197 31 12YSZ03-07 136 234 314 0.75 0.1403 0.0045 7.209 0.132 0.3729 0.0061 2231 54 2138 16 2043 29 12YSZ03-08 95 151 206 0.74 0.1402 0.0046 7.695 0.150 0.3984 0.0067 2229 56 2196 18 2162 31 12YSZ03-09 114 202 261 0.77 0.1395 0.0045 7.232 0.135 0.3763 0.0062 2220 55 2141 17 2059 29 12YSZ03-10 110 231 253 0.91 0.1401 0.0045 7.264 0.134 0.3761 0.0062 2229 55 2144 16 2058 29 12YSZ03-11 83 81 186 0.44 0.1414 0.0046 7.518 0.144 0.3859 0.0064 2244 55 2175 17 2104 30 12YSZ03-12 140 249 329 0.76 0.1395 0.0045 7.087 0.130 0.3688 0.0060 2221 55 2123 16 2024 28 12YSZ03-13 92 137 213 0.64 0.1403 0.0046 7.169 0.138 0.3707 0.0062 2231 56 2133 17 2033 29 12YSZ03-14 99 125 202 0.62 0.1439 0.0047 8.371 0.162 0.4221 0.0070 2275 55 2272 18 2270 32 12YSZ03-15 92 73 197 0.37 0.1392 0.0053 7.746 0.211 0.4038 0.0076 2217 65 2202 25 2187 35 12YSZ03-16 131 227 286 0.80 0.1403 0.0045 7.658 0.141 0.3960 0.0065 2231 55 2192 17 2151 30 12YSZ03-17 139 265 306 0.87 0.1428 0.0048 7.725 0.161 0.3925 0.0067 2262 57 2200 19 2134 31 12YSZ03-18 107 118 238 0.50 0.1404 0.0046 7.539 0.142 0.3895 0.0064 2233 55 2178 17 2121 30 12YSZ03-19 131 221 285 0.78 0.1403 0.0049 7.665 0.172 0.3964 0.0069 2231 59 2193 20 2152 32 12YSZ03-20 111 133 257 0.52 0.1422 0.0046 7.295 0.133 0.3723 0.0061 2254 54 2148 16 2040 29 透辉斜长片麻岩 (12YSZ031) 12YSZ031-01 104 259 432 0.60 0.1272 0.0049 3.652 0.103 0.2083 0.0039 2060 66 1561 22 1220 21 12YSZ031-02 95 403 408 0.99 0.1330 0.0050 3.755 0.100 0.2047 0.0038 2138 64 1583 21 1200 20 12YSZ031-03 94 270 373 0.72 0.1310 0.0044 3.933 0.086 0.2178 0.0038 2111 58 1620 18 1270 20 12YSZ031-04 95 248 379 0.65 0.1335 0.0049 4.007 0.104 0.2176 0.0040 2145 63 1636 21 1269 21 12YSZ031-05 104 471 423 1.11 0.1344 0.0047 4.012 0.093 0.2163 0.0038 2156 59 1637 19 1263 20 12YSZ031-06 97 225 376 0.60 0.1326 0.0056 4.067 0.134 0.2225 0.0045 2133 72 1648 27 1295 24 12YSZ031-07 96 394 364 1.08 0.1316 0.0051 4.160 0.119 0.2293 0.0044 2119 66 1666 23 1331 23 12YSZ031-08 106 266 371 0.72 0.1291 0.0051 4.349 0.130 0.2444 0.0047 2086 68 1703 25 1410 24 12YSZ031-09 98 226 358 0.63 0.1321 0.0042 4.372 0.084 0.2399 0.0041 2126 55 1707 16 1386 21 12YSZ031-10 54 78 187 0.41 0.1286 0.0071 4.488 0.214 0.2530 0.0063 2079 94 1729 40 1454 32 12YSZ031-11 112 79 386 0.20 0.1300 0.0041 4.588 0.087 0.2558 0.0043 2098 55 1747 16 1468 22 12YSZ031-12 98 252 328 0.77 0.1278 0.0043 4.602 0.100 0.2612 0.0045 2067 58 1750 18 1496 23 12YSZ031-13 82 154 265 0.58 0.1311 0.0043 4.881 0.098 0.2701 0.0046 2112 56 1799 17 1541 23 12YSZ031-14 85 202 257 0.79 0.1266 0.0044 5.011 0.118 0.2870 0.0051 2052 60 1821 20 1627 25 12YSZ031-15 103 207 294 0.70 0.1283 0.0046 5.336 0.132 0.3016 0.0055 2075 62 1875 21 1699 27 12YSZ031-16 89 70 251 0.28 0.1269 0.0041 5.393 0.105 0.3083 0.0052 2055 56 1884 17 1732 26 12YSZ031-17 76 107 200 0.54 0.1306 0.0047 6.070 0.154 0.3367 0.0062 2107 62 1986 22 1871 30 
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表 2 晋陕交界涑水杂岩锆石Hf同位素组成
Table 2 Zircon Hf isotopic compositions of the Sushui complex in Shanxi-Shaanxi border area
样品号 年龄/Ma 176Yb/177Hf 176Lu/177Hf (176Hf/177Hf)0 (176Hf/177Hf)i 2σ εHf (t) 2σ TDM1 TDM2(CC) TDM2(CC_2014) fLu/Hf 角闪斜长片麻岩(12YSZ03) 12YSZ03-01 2260 0.043486 0.001403 0.281450 0.281389 0.000010 1.9 0.3 2545 2709 2648 -0.96 12YSZ03-02 2260 0.026787 0.000923 0.281402 0.281362 0.000013 0.9 0.5 2578 2768 2700 -0.97 12YSZ03-03 2260 0.070682 0.002234 0.281411 0.281315 0.000013 -0.8 0.5 2657 2871 2789 -0.93 12YSZ03-05 2260 0.021740 0.000804 0.281432 0.281398 0.000019 2.2 0.7 2529 2690 2632 -0.98 12YSZ03-06 2260 0.046220 0.001520 0.281452 0.281387 0.000015 1.8 0.5 2549 2714 2654 -0.95 12YSZ03-07 2260 0.019108 0.000645 0.281372 0.281344 0.000010 0.2 0.4 2600 2807 2734 -0.98 12YSZ03-08 2260 0.054515 0.001778 0.281421 0.281344 0.000014 0.3 0.5 2611 2807 2734 -0.95 12YSZ03-09 2260 0.039883 0.001260 0.281414 0.281360 0.000014 0.8 0.5 2585 2773 2704 -0.96 12YSZ03-11 2260 0.103130 0.003122 0.281435 0.281300 0.000016 -1.3 0.6 2688 2903 2816 -0.91 12YSZ03-12 2260 0.015796 0.000542 0.281387 0.281363 0.000017 0.9 0.6 2574 2765 2697 -0.98 12YSZ03-14 2260 0.046732 0.001466 0.281372 0.281309 0.000021 -1.0 0.8 2657 2884 2800 -0.96 12YSZ03-15 2260 0.051977 0.001629 0.281432 0.281362 0.000012 0.9 0.4 2585 2768 2700 -0.95 12YSZ03-16 2260 0.050081 0.001567 0.281417 0.281349 0.000013 0.4 0.5 2601 2795 2723 -0.95 12YSZ03-17 2260 0.042134 0.001347 0.281401 0.281343 0.000016 0.2 0.6 2608 2809 2735 -0.96 12YSZ03-18 2260 0.051399 0.001622 0.281402 0.281332 0.000015 -0.2 0.5 2626 2833 2756 -0.95 12YSZ03-20 2260 0.038482 0.001219 0.281425 0.281372 0.000011 1.2 0.4 2567 2746 2681 -0.96 透辉斜长片麻岩 (12YSZ031) 12YSZ031-01 2053 0.024452 0.000861 0.281505 0.281472 0.000013 0.0 0.5 2433 2661 2579 -0.97 12YSZ031-02 2053 0.040618 0.001427 0.281492 0.281436 0.000021 -1.3 0.7 2488 2738 2646 -0.96 12YSZ031-04 2053 0.027679 0.000941 0.281520 0.281483 0.000014 0.4 0.5 2418 2636 2558 -0.97 12YSZ031-05 2053 0.032882 0.001127 0.281486 0.281442 0.000018 -1.1 0.6 2477 2725 2635 -0.97 12YSZ031-07 2053 0.033591 0.001111 0.281519 0.281475 0.000014 0.1 0.5 2431 2653 2572 -0.97 12YSZ031-08 2053 0.033288 0.001114 0.281475 0.281432 0.000023 -1.4 0.8 2490 2747 2654 -0.97 12YSZ031-09 2053 0.034142 0.001181 0.281528 0.281482 0.000026 0.4 0.9 2422 2638 2559 -0.96 12YSZ031-10 2053 0.032118 0.001058 0.281483 0.281442 0.000019 -1.1 0.7 2476 2725 2635 -0.97 12YSZ031-11 2053 0.023981 0.000759 0.281487 0.281457 0.000027 -0.5 0.9 2452 2692 2606 -0.98 12YSZ031-12 2053 0.059430 0.001923 0.281543 0.281468 0.000018 -0.1 0.6 2449 2668 2586 -0.94 12YSZ031-13 2053 0.050933 0.001590 0.281517 0.281455 0.000016 -0.6 0.6 2464 2697 2611 -0.95 12YSZ031-14 2053 0.015522 0.000548 0.281519 0.281498 0.000010 0.9 0.4 2395 2603 2529 -0.98 12YSZ031-16 2053 0.047364 0.001547 0.281555 0.281494 0.000011 0.8 0.4 2409 2611 2536 -0.95 12YSZ031-17 2053 0.014949 0.000507 0.281501 0.281481 0.000008 0.3 0.3 2417 2640 2561 -0.98 二长花岗片麻岩 (12XWK03) 12XWK03-01 2098 0.041136 0.001278 0.281353 0.281302 0.000020 -5.0 0.7 2669 3000 2879 -0.96 12XWK03-02 2098 0.072607 0.002298 0.281365 0.281274 0.000051 -6.0 1.8 2726 3063 2933 -0.93 12XWK03-03 2098 0.059392 0.001697 0.281394 0.281326 0.000025 -4.1 0.9 2642 2948 2834 -0.95 12XWK03-04 2098 0.062262 0.001884 0.281386 0.281311 0.000020 -4.7 0.7 2667 2982 2864 -0.94 12XWK03-06 2098 0.048828 0.001484 0.281346 0.281287 0.000019 -5.5 0.7 2693 3033 2908 -0.96 12XWK03-07 2098 0.043049 0.001330 0.281395 0.281342 0.000019 -3.6 0.7 2615 2915 2805 -0.96 12XWK03-08 2098 0.051850 0.001573 0.281423 0.281360 0.000017 -2.9 0.6 2593 2874 2770 -0.95 12XWK03-09 2098 0.065822 0.001815 0.281376 0.281303 0.000024 -5.0 0.9 2676 2999 2878 -0.95 12XWK03-11 2098 0.022580 0.000708 0.281324 0.281296 0.000017 -5.2 0.6 2669 3015 2892 -0.98 12XWK03-12 2098 0.037852 0.001223 0.281403 0.281354 0.000014 -3.2 0.5 2597 2888 2782 -0.96
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