Depositional age of the Dagushi Group in the Dahong Mountain, Hubei Prov-ince:Evidence from U-Pb ages of detrital zircons
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摘要:
出露于扬子北缘大洪山地区的打鼓石群是扬子地区保留比较完整的中元古代地层,其上被青白口系花山群不整合覆盖。通常认为其与神农架群时代相当,但缺乏物源及同位素地质年代学证据。首次报导了打鼓石群底部太阳寺组砂岩的碎屑锆石U-Pb年龄。测年结果显示,该砂岩中碎屑锆石最古老的年龄为3.1~3.2Ga,最年轻年龄为1124Ma,并在2.65Ga和2.75Ga出现统计峰值,且年龄组成与崆岭杂岩区和杨坡杂岩区的多期岩浆活动具有较好的可比性。而鄂西地区神农架群沉积于1.1~1.4Ga,主要统计峰值年龄为1.6Ga、2~2.1Ga、2.7~2.8Ga。因此,打鼓石群沉积时间晚于神农架群,两者非同物异名。
Abstract:The Dagushi Group, spread on the northern margin of the Yangtze Craton, is a well-preserved succession of the Mesopro-terozoic strata in South China, unconformably overlain by the Huashan Group.It is generally considered to have the same age as the Shennongjia Group.However, the isotopic geochronological evidence of material source is relatively insufficient.Detrital zircon UPb dating results of sandstone from Taiyangsi Formation on the bottom of Dagushi Group are first reported in this paper.The dating re-sults demonstrate that the oldest and youngest ages are 3.1~3.2Ga and 1124Ma, respectively.There are two age peaks of 2.65Ga and 2.75Ga in the detrital zircon.Its detrital zircon ages are consistent with the multi-period magmatic activities in Kongling Complex and Yangpo Complex before Neoproterozoic.Nevertheless, the Shennongjia Group, widely distributed in western Hubei Province, was deposited from 1.4Ga to 1.1Ga with three age peaks of 1.6Ga, 2~2.1Ga and 2.7~2.8Ga.These data indicate that the Dagushi Group was deposited obviously later than the Shennongjia Group, and hence they do not belong to the same stratigraphic sequence.
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Key words:
- Dahongshan /
- Dagushi Group /
- detrital zircon /
- Shennongjia Group /
- Kongling Complex /
- Yangpo Complex
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表 1 大洪山太阳寺组碎屑锆石LA-ICP-MS U-Th-Pb年龄测定结果
Table 1. Data of the LA-ICP-MS U-Th-Pb ages of detrital zircons from the Taiyangsi Formation in Dahongshan area
测点 含量/106 Th/U 比值 年龄/Ma(1σ) Pb Th U 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ 208Pb/232Th ±1σ 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th DS-1 547 482 413 1.17 0.1469 0.0034 8.697 0.2399 0.4320 0.0059 0.0223 0.0025 2310±40 2307±25 2315±26 445±49 DS-2 333 329 310 1.06 0.1249 0.0036 6.256 0.1818 0.3669 0.0041 0.0227 0.0023 2027士50 2012±25 2015±19 454±45 DS-3 165 338 278 1.22 0.0771 0.0030 1.979 0.0786 0.1891 0.0029 0.0135 0.0012 1124±78 1108±26 1116±15 271±24 DS-4 405 280 276 1.02 0.1811 0.0036 12.71 0.2990 0.5103 0.0068 0.0344 0.0029 2663±31 2658±22 2658士29 683±55 DS-5 149 145 127 1.15 0.1370 0.0043 7.124 0.2251 0.3813 0.0057 0.0299 0.0024 2190±22 2127±28 2082±26 595±47 DS-6 309 366 264 1.39 0.1248 0.0029 6.186 0.1439 0.3611 0.0038 0.0291 0.0023 2028±46 2003±20 1987±18 579±45 DS-7 244 228 159 1.43 0.1573 0.0039 9.906 0.2346 0.4590 0.0053 0.0395 0.0032 2428±42 2426±21 2435±23 783±61 DS-8 642 348 359 0.97 0.2440 0.0045 20.88 0.4011 0.6200 0.0070 0.0538 0.0043 3146±29 3133±18 3110±27 1059±82 DS-9 315 168 276 0.61 0.1767 0.0037 11.66 0.2262 0.4789 0.0050 0.0492 0.0042 2633±34 2578±18 2522±21 972±80 DS-10 453 491 246 1.99 0.1581 0.0035 9.856 0.2077 0.4511 0.0047 0.0464 0.0039 2435±36 2421±19 2400±20 917±75 DS-11 419 210 365 0.58 0.1795 0.0033 12.22 0.2146 0.4923 0.0053 0.0562 0.0044 2648土31 2622±16 2581±22 U05±84 DS-12 320 161 275 0.59 0.1807 0.0044 12.79 0.2974 0.5148 0.0077 0.0569 0.0042 2659±40 2665±21 2677±32 1118±80 DS-13 767 973 668 1.46 0.1230 0.0022 5.621 0.1157 0.3315 0.0055 0.0388 0.0027 2067±31 1919±17 1846±26 769±51 DS-14 442 210 409 0.51 0.1794 0.0031 12.17 0.2364 0.4922 0.0076 0.0553 0.0036 2648±27 2618±18 2580±32 1087±69 DS-15 477 256 402 0.64 0.1818 0.0033 12.84 0.2402 0.5117 0.0067 0.0558 0.0036 2669±29 2668±17 2664±28 1098±69 DS-16 346 227 500 0.45 0.1147 0.0025 5.323 0.1098 0.3372 0.0034 0.0408 0.0026 1876±40 1873士17 1873±16 809±50 DS-17 257 135 213 0.63 0.1913 0.0038 14.00 0.2753 0.5324 0.0063 0.0543 0.0036 2753±33 2750±18 2751±26 1069±68 DS-18 801 428 718 0.60 0.1792 0.0027 12.41 0.1891 0.5024 0.0043 0.0520 0.0034 2656±25 2636±14 2624±18 1024±66 DS-19 431 289 345 0.84 0.1796 0.0032 12.52 0.2307 0.5057 0.0050 0.0518 0.0036 2650±29 2644±17 2638±21 1021±70 DS-20 428 207 404 0.51 0.1799 0.0033 12.31 0.2279 0.4972 0.0049 0.0528 0.0040 2652±31 2628士17 2602±21 1040^76 DS-21 399 259 327 0.79 0.1768 0.0037 11.87 0.2549 0.4878 0.0050 0.0555 0.0041 2633±35 2594±20 2561±21 1092±78 DS-22 126 198 97.3 2.03 0.1237 0.0043 5.605 0.1926 0.3320 0.0046 0.0389 0.0025 2011±62 1917士29 1848±22 771±49 DS-23 264 465 160 2.91 0.1137 0.0036 5.154 0.1444 0.3339 0.0041 0.0394 0.0023 1859±52 1845±23 1857±19 782±44 DS-24 385 213 337 0.63 0.1796 0.0030 12.62 0.2179 0.5103 0.0050 0.0604 0.0033 2649±27 2652±16 2658±21 1185±62 DS-25 412 282 312 0.90 0.1795 0.0029 12.69 0.2072 0.5135 0.0045 0.0629 0.0032 2650±27 2657±15 2672士19 1233±60 DS-26 246 195 238 0.82 0.1389 0.0031 7.829 0.1776 0.4097 0.0045 0.0526 0.0027 2214±38 2212±20 2214±20 1037±51 DS-27 698 400 604 0.66 0.1795 0.0026 12.34 0.1761 0.4978 0.0034 0.0644 0.0030 2650±24 2630±13 2604±14 1261±56 DS-28 303 263 224 1.18 0.1788 0.0042 10.98 0.2566 0.4457 0.0045 0.0624 0.0031 2643±39 2522±21 2376±20 1223±59 DS-29 438 352 455 0.77 0.1382 0.0024 7.359 0.1255 0.3862 0.0033 0.0550 0.0026 2206±29 2156±15 2105±15 1081±49 DS-30 282 179 223 0.80 0.1792 0.0037 12.29 0.2448 0.4977 0.0047 0.0722 0.0036 2656±34 2627±18 2604±20 1408±67 DS-31 221 130 164 0.79 0.1914 0.0043 13.15 0.2883 0.4990 0.0055 0.0736 0.0038 2754±37 2691±20 2609±23 1435士72 DS-32 117.3 85.7 100 0.85 0.1793 0.0090 11.04 0.5670 0.4471 0.0063 0.0797 0.0077 2647±83 2527±47 2382±27 1550±144 DS-33 391 199 338 0.59 0.1795 0.0030 12.51 0.2156 0.5050 0.0049 0.0682 0.0035 2650±28 2644±16 2635±20 1334±65 DS-34 529 212 510 0.42 0.1816 0.0027 12.49 0.1948 0.4976 0.0043 0.0617 0.0030 2668±25 2642±14 2604±18 1210±56 DS-35 459 265 376 0.70 0.1803 0.0032 12.58 0.2242 0.5054 0.0051 0.0640 0.0032 2657±28 2649±16 2637±21 1255±61 DS-36 381 212 316 0.67 0.1880 0.0030 13.36 0.2153 0.5152 0.0045 0.0612 0.0032 2724±26 2706±15 2679±19 1201±61 DS-37 491 288 356 0.81 0.1890 0.0033 13.35 0.2959 0.5102 0.0063 0.0672 0.0042 2744±28 2705±20 2657±27 1314±79 DS-38 413 416 302 1.38 0.1477 0.0032 8.332 0.1657 0.4092 0.0038 0.0460 0.0028 2320±42 2268±18 2211±17 909±54 DS-39 341 178 303 0.59 0.1792 0.0033 12.03 0.2299 0.4868 0.0053 0.0581 0.0039 2645±30 2607±17 2557±23 1142±75 DS-40 311 350 254 1.38 0.1378 0.0031 7.089 0.1572 0.3742 0.0038 0.0417 0.0031 2211±39 2123±19 2049±17 825士60 DS-41 450 244 381 0.64 0.1816 0.0032 13.20 0.2300 0.5276 0.0049 0.0531 0.0040 2733±28 2694±16 2731±20 1045±76 DS-42 539 312 408 0.76 0.1882 0.0035 13.50 0.2681 0.5197 0.0060 0.0583 0.0041 2728±30 2715±18 2698±25 1146±79 DS-43 390 995 530 1.88 0.0789 0.0018 2.087 0.0492 0.1923 0.0020 0.0238 0.0015 1169±46 1145±16 1134±10 475±28 DS-44 286 148 236 0.63 0.1890 0.0037 13.36 0.2422 0.5143 0.0050 0.0619 0.0036 2744±31 2705±17 2675±21 1215±69 DS-45 318 168 250 0.67 0.1886 0.0040 13.43 0.2870 0.5178 0.0065 0.0641 0.0036 2731±35 2710±20 2690±27 1255±68 DS-46 340 238 407 0.58 0.1294 0.0025 6.677 0.1344 0.3743 0.0035 0.0479 0.0025 2100±34 2070±17 2050±16 946±48 DS-47 338 122 288 0.42 0.1959 0.0035 14.62 0.2690 0.5421 0.0054 0.0786 0.0041 2792±29 2791±17 2792i22 1530±77 DS-48 239 174 168 1.04 0.1911 0.0042 12.83 0.2784 0.4890 0.0058 0.0675 0.0036 2754±35 2667^20 2567±24 1320±68 DS-49 307 498 227 2.19 0.1142 0.0029 5.130 0.1286 0.3273 0.0038 0.0454 0.0024 1866±50 1841±21 1825±18 898±45 DS-50 430 326 281 1.16 0.1834 0.0039 13.00 0.2927 0.5149 0.0059 0.0718 0.0039 2684±36 2680±21 2678±25 1402±74 DS-51 522 294 420 0.70 0.1816 0.0035 13.18 0.2763 0.5271 0.0059 0.0753 0.0041 2733土; 51 2693±19 2729±24 1468士76 DS-52 230 205 208 0.99 0.1320 0.0035 6.948 0.1889 0.3830 0.0045 0.0601 0.0032 2124士46 2105±24 2090±20 1179±60 DS-53 354 255 240 1.06 0.1879 0.0043 13.12 0.2663 0.5101 0.0057 0.0721 0.0036 2724±38 2688±19 2657±24 1407±68 DS-54 670 551 361 1.53 0.1921 0.0032 14.57 0.2470 0.5505 0.0052 0.0724 0.0034 2761士27 2787±16 2827±21 1413±64 DS-55 530 229 477 0.48 0.1799 0.0027 12.67 0.2238 0.5098 0.0055 0.0702 0.0034 2654±25 2655±16 2656±23 1372±63 DS-56 469 278 351 0.79 0.1825 0.0029 12.93 0.2125 0.5144 0.0053 0.0686 0.0033 2676±25 2675±15 2675±22 1340±62 DS-57 117 195 68.4 2.86 0.1246 0.0044 5.756 0.2116 0.3369 0.0054 0.0445 0.0023 2033土61 1940±31 1872±26 880±44 DS-58 256 132 184 0.72 0.2096 0.0048 14.84 0.3546 0.5151 0.0092 0.0719 0.0043 2903土37 2805±22 2678士39 1404±81 DS-59 481 230 265 0.87 0.2663 0.0045 24.65 0.4578 0.6700 0.0075 0.0754 0.0043 3284±26 3294±18 3306±28 1469±79 DS-60 183 112 142 0.79 0.1900 0.0041 12.76 0.2836 0.4888 0.0072 0.0611 0.0040 2742±35 2662±20 2566±31 1199±75 -
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① 湖北省区域地质测量队. 1:20万钟祥幅、应城幅区域地质调查报告. 1980.
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