Detrital zircon U–Pb age of graphite−hosting meta−sedimentary rocks in the Lüwang–Gaoqiao mélange belt, western Dabie area: Constraints on Mesoproterozoic marine sedimentary events
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摘要:
研究目的 扬子陆块北缘大别山地区古元古代—中元古代的物质记录有限，制约了前寒武纪地质构造演化认识。大别山核部吕王—高桥混杂岩带内“石墨片岩–石英岩夹大理岩”沉积岩系的年代学研究可为大别山地区中元古代古洋（海）盆演化提供新约束，对区域前寒武纪成矿与找矿提供科学指导。
研究方法 在开展1∶10000地质测量查明混杂岩带岩石组合特征的基础上，本文重点利用激光剥蚀电感耦合等离子体质谱方法，对赋石墨矿变沉积岩系的石英岩开展锆石原位U–Pb同位素测年。
研究结果 大别造山带核部发育中元古代“石墨片岩–石英岩夹大理岩”变沉积岩系，为一套浅海相沉积、成熟度高的砂岩。石英岩原岩的碎屑锆石年龄峰值主要为2.55 Ga、2.06 Ga、1.86 Ga及1.43 Ga，最年轻峰值年龄1.43 Ga约束了原岩沉积时代下限。这套变沉积岩原岩沉积时代为中元古代晚期，其沉积物源可能主要来自扬子陆块基底。
结论 吕王—高桥混杂岩带保留了大别山核部较早的海相沉积记录，并为区域石墨成矿提供了物质基础。该变沉积岩系原岩可能形成于中元古代哥伦比亚超大陆裂解期的扬子陆块边缘海盆地。
Abstract:This paper is the result of geological survey engineering.
Objective To better understand the Paleo–Mesoproterozoic tectonic evolution of the Dabie orogen in the northern margin of Yangtze Block, we demonstrated the geological and geochronological characteristics for sedimentary rocks in the Lüwang–Gaoqiao mélange.
Methods Geological mapping for the mélange was conducted. LA–ICP–MS zircon U–Pb isotopic analyses were carried out on the graphite−bearing quartzite.
Results The graphite−bearing sedimentary rocks in Lüwang–Gaoqiao mélange are dominated by sandstones with high maturity, siliceous argillaceous rock, and carbonaceous. U–Pb dating reveals that the graphite−bearing quartzite has original deposition age of ~1.43 Ga, displaying detrital zircon age peaks at 2.55 Ga, 2.06 Ga, 1.86 Ga and 1.43 Ga. The sedimentary materials mainly came from the basement of the Yangtze Block.
Conclusions The Mesoproterozoic clastic sedimentary rocks and carbonates from the Lüwang–Gaoqiao mélange were formed in a continental margin setting. They recorded an extensional regime for the Dabie orogen in the northern margin of Yangtze Block, during the break−up of the Columbia supercontinent.
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图 1 西大别地区大地构造位置图（a）和区域地质简图（b）（据Liu et al., 2004修改）
Figure 1.
表 1 吕王—高桥混杂岩带红马冲石墨矿赋矿石英岩LA–ICP–MS锆石U–Pb同位素测定结果
Table 1. LA–ICP–MS zircon isotopic U–Pb data of the graphite−bearing quartzite from the Hongmachong graphite deposit in the Lüwang–Gaoqiao mélange belt
样品点号 元素含量/10−6 Th/U 同位素比值 同位素年龄/Ma Pb Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ TC32-Zr@01 447 174 372 0.47 0.1838 0.0028 12.2248 0.1986 0.4806 0.0038 2688 26 2622 15 2530 16 TC32-Zr@02 529 238 432 0.55 0.1839 0.0026 11.7244 0.1639 0.4606 0.0033 2689 29 2583 13 2442 15 TC32-Zr@03 1094 564 585 0.96 0.1793 0.0025 11.7937 0.1515 0.4752 0.0031 2646 18 2588 12 2506 14 TC32-Zr@04 307 121 264 0.46 0.1807 0.0028 12.1086 0.1793 0.4840 0.0040 2661 25 2613 14 2545 17 TC32-Zr@05 756 314 759 0.41 0.1732 0.0028 10.3402 0.1985 0.4297 0.0052 2589 28 2466 18 2304 23 TC32-Zr@06 357 169 258 0.66 0.1757 0.0031 11.0495 0.2104 0.4530 0.0050 2613 30 2527 18 2409 22 TC32-Zr@07 93 43.2 52.4 0.82 0.1753 0.0039 11.9728 0.2732 0.4940 0.0062 2609 37 2602 21 2588 27 TC32-Zr@08 445 219 401 0.55 0.1653 0.0025 9.4196 0.1315 0.4112 0.0029 2511 26 2380 13 2221 13 TC32-Zr@09 796 326 1183 0.28 0.1589 0.0025 8.3790 0.1594 0.3784 0.0031 2444 28 2273 17 2069 15 TC32-Zr@10 436 196 424 0.46 0.1671 0.0026 10.3198 0.1610 0.4454 0.0036 2529 27 2464 14 2375 16 TC32-Zr@11 840 406 766 0.53 0.1801 0.0029 11.2765 0.1728 0.4519 0.0034 2653 26 2546 14 2403 15 TC32-Zr@12 675 387 508 0.76 0.1606 0.0025 9.0476 0.1505 0.4063 0.0036 2461 26 2343 15 2198 16 TC32-Zr@13 390 231 440 0.53 0.1339 0.0021 6.4915 0.0983 0.3504 0.0025 2150 26 2045 13 1936 12 TC32-Zr@14 502 314 520 0.60 0.1271 0.0020 6.1662 0.1007 0.3507 0.0029 2059 28 2000 14 1938 14 TC32-Zr@15 1078 560 612 0.91 0.2076 0.0031 13.5744 0.2030 0.4729 0.0032 2887 24 2720 14 2496 14 TC32-Zr@16 258 121 194 0.62 0.1643 0.0028 10.4576 0.1876 0.4607 0.0045 2502 28 2476 17 2443 20 TC32-Zr@17 291 227 266 0.85 0.1103 0.0019 4.7688 0.0832 0.3132 0.0026 1803 31 1779 15 1756 13 TC32-Zr@18 735 419 641 0.65 0.1602 0.0022 8.6314 0.1351 0.3894 0.0038 2458 23 2300 14 2120 18 TC32-Zr@19 732 610 442 1.38 0.1156 0.0018 5.0681 0.0757 0.3171 0.0022 1900 28 1831 13 1776 11 TC32-Zr@20 502 236 502 0.47 0.1594 0.0023 9.3390 0.1383 0.4237 0.0032 2450 25 2372 14 2277 15 TC32-Zr@21 1010 632 747 0.85 0.1548 0.0023 8.3479 0.1270 0.3898 0.0031 2400 24 2270 14 2122 14 TC32-Zr@22 303 155 237 0.65 0.1592 0.0025 9.3966 0.1467 0.4273 0.0035 2447 27 2377 14 2293 16 TC32-Zr@23 520 403 418 0.96 0.1159 0.0018 4.9137 0.0921 0.3061 0.0036 1894 27 1805 16 1721 18 TC32-Zr@24 405 179 254 0.71 0.1704 0.0028 10.2423 0.1682 0.4348 0.0033 2561 28 2457 15 2327 15 TC32-Zr@25 529 334 723 0.46 0.1140 0.0018 4.9420 0.0748 0.3137 0.0021 1865 29 1809 13 1759 10 TC32-Zr@26 263 200 334 0.60 0.1477 0.0027 7.2631 0.1835 0.3539 0.0056 2320 31 2144 23 1953 27 TC32-Zr@27 989 390 555 0.70 0.2205 0.0033 16.9669 0.2513 0.5564 0.0037 2984 24 2933 14 2852 15 TC32-Zr@28 731 457 572 0.80 0.1429 0.0022 7.4939 0.1119 0.3794 0.0026 2263 32 2172 13 2073 12 TC32-Zr@29 580 354 338 1.05 0.1740 0.0026 10.7121 0.1921 0.4450 0.0054 2598 25 2498 17 2373 24 TC32-Zr@30 650 316 356 0.89 0.1864 0.0027 12.5810 0.1792 0.4879 0.0032 2710 29 2649 13 2561 14 TC32-Zr@31 1055 439 602 0.73 0.2377 0.0033 17.5185 0.2297 0.5326 0.0029 3105 22 2964 13 2752 12 TC32-Zr@32 662 388 1017 0.38 0.1534 0.0021 7.8044 0.1100 0.3675 0.0028 2384 24 2209 13 2018 13 TC32-Zr@33 1302 876 1050 0.83 0.1586 0.0020 8.0541 0.1146 0.3667 0.0031 2443 21 2237 13 2014 14 TC32-Zr@34 557 583 767 0.76 0.0904 0.0015 2.7981 0.0460 0.2237 0.0017 1433 27 1355 12 1301 9 TC32-Zr@35 241 146 229 0.64 0.1287 0.0024 6.5433 0.1267 0.3673 0.0032 2080 33 2052 17 2017 15 TC32-Zr@36 601 390 681 0.57 0.1293 0.0021 6.0315 0.0923 0.3372 0.0025 2089 28 1980 13 1873 12 TC32-Zr@37 707 417 383 1.09 0.1816 0.0027 10.9645 0.1999 0.4357 0.0049 2733 25 2520 17 2331 22 TC32-Zr@38 439 168 566 0.30 0.1674 0.0025 9.3899 0.1326 0.4056 0.0030 2532 25 2377 13 2195 14 TC32-Zr@39 463 224 441 0.51 0.1657 0.0023 9.5131 0.1327 0.4147 0.0028 2515 24 2389 13 2236 13 TC32-Zr@40 502 97.4 1309 0.07 0.1222 0.0016 5.2861 0.0757 0.3121 0.0025 1989 24 1867 12 1751 12 TC32-Zr@41 432 443 578 0.77 0.0894 0.0016 2.8185 0.0486 0.2279 0.0018 1413 39 1360 13 1324 10 TC32-Zr@42 422 281 669 0.42 0.1130 0.0018 4.6446 0.0704 0.2972 0.0025 1848 28 1757 13 1677 12 TC32-Zr@43 459 353 391 0.90 0.1136 0.0019 4.7652 0.0778 0.3035 0.0026 1857 30 1779 14 1709 13 TC32-Zr@44 592 584 988 0.59 0.1252 0.0019 3.9571 0.0602 0.2287 0.0020 2032 23 1625 12 1328 10 TC32-Zr@45 1135 693 899 0.77 0.1636 0.0025 8.4855 0.1481 0.3749 0.0043 2493 23 2284 16 2052 20 TC32-Zr@46 45.3 18.0 65.9 0.27 0.1569 0.0072 7.8727 0.3014 0.3638 0.0093 2423 80 2217 34 2000 44 TC32-Zr@47 1183 883 1037 0.85 0.1777 0.0023 9.5934 0.1195 0.3900 0.0025 2631 18 2397 11 2123 12 TC32-Zr@48 656 370 882 0.42 0.1540 0.0022 7.3997 0.1448 0.3467 0.0048 2391 24 2161 18 1919 23 TC32-Zr@49 1212 1288 927 1.39 0.1839 0.0030 9.1221 0.1488 0.3589 0.0036 2688 22 2350 15 1977 17 TC32-Zr@50 1400 2556 1298 1.97 0.1649 0.0026 5.6473 0.1224 0.2469 0.0037 2506 27 1923 19 1422 19 TC32-Zr@51 1257 1616 1547 1.04 0.1885 0.0026 7.9220 0.1050 0.3035 0.0018 2729 20 2222 12 1709 9 TC32-Zr@52 735 1126 671 1.68 0.2007 0.0032 9.2502 0.2940 0.3321 0.0091 2832 27 2363 29 1849 44 TC32-Zr@53 1202 1406 1431 0.98 0.2667 0.0043 12.0093 0.1948 0.3246 0.0026 3287 23 2605 15 1812 13 TC32-Zr@54 637 911 1545 0.59 0.1121 0.0015 3.6978 0.0473 0.2389 0.0017 1834 20 1571 10 1381 9 
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