The discovery of Devonian strata in Lanyang area, Danzhou, Hainan Province: Evidence from the zircon U-Pb ages
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摘要:
在海南岛中部儋州兰洋镇上番开村附近，发育一套灰绿色变细砂岩、变粉砂岩与深灰色板岩互层的岩石组合，其整合于灰色变细砂岩夹浅灰色中厚层状结晶灰岩或白云质灰岩组合的地层之上，伏于灰黑色炭质板岩、千枚岩与灰色变细砂岩互层，夹薄层硅质岩的地层之下。前人将该套岩石组合划归石炭纪青天峡组。本次在该组合下部新发现了2层沉凝灰岩夹层，对该凝灰岩进行LA-ICP-MS锆石U-Pb年龄测试，60颗锆石206Pb/238U年龄分成4组，其中年龄最小的一组为349~375 Ma，年龄加权平均值为365±3 Ma，代表了火山喷发的时限，也指示地层的沉积时代为晚泥盆世晚期，这是海南岛首次报道的泥盆系绝对年龄。结合在相邻的上番开村青天峡组结晶灰岩中新采获的泥盆纪弗拉期竹节石Polycylindrites鉴定结果，可以确定海南岛存在中晚泥盆世沉积。据此对海南岛中北部晚古生代地层序列进行了重新厘定，为研究古特提斯洋东延及构造演化等问题提供了新的思路和证据。
Abstract:The interbedded rock assemblage of grayish green metamorphic fine-grained sandstone, metasiltstone and dark gray slate is developed near Shangfankai Village, Lanyang Town, Danzhou City in the middle of Hainan Island.This rock assemblage overlies the gray metamorphic fine-grained sandstone intercalated with light gray medium-thick bedded crystalline limestone and dolomitic limestone, and underlies the interbedded strata of grayish-black carbonaceous slate, phyllite, and gray metamorphic fine-grained sandstone intercalated with thin bedded chert.Previously, this rock association was classified as Carboniferous Qingtianxia Formation.In this study, two sedimentary tuff beds were discovered in the lower part of this rock association.According to the zircon U-Pb age dating by LA-ICP-MS, 60 zircon of 206Pb /238U age are divided into four groups.The youngest group is 349~375 Ma, and the weighted average age of 365±3 Ma represents the time of the eruption.Therefore, the strata should be deposited in the Late Devonian.This is the first absolute age of Devonian on Hainan island.The tentaculitoid Polycylindrites, obtained in the crystalline limestone of Qingtianxia Formation near Shangfankai Village, indicate that the Middle-Late Devonian deposition existed in the Hainan Island.The stratigraphic sequence of the Late Paleozoic in the northern part of central Hainan Island was reclassified, which provides new ideas and evidence for the study of eastward extension of the Paleo-Tethys Ocean and tectonic evolution.
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Key words:
- sedimentary tuff /
- zircon U-Pb age /
- Devonian /
- tentaculitoid /
- Hainan Island
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表 1 兰洋地区青天峡组沉凝灰岩LA-ICP-MS锆石U-Th-Pb年龄测定结果
Table 1. Zircon U-Th-Pb isotope data obtained by LA-ICP-MS from Qingtianxia Formation tuff in Lanyang area
测点 含量/10-6 Th/U 同位素比值 同位素年龄/Ma 谐和度 Pb Th U 207Pb/
206Pb1σ 207Pb/
235U1σ 206Pb/
238U1σ 207Pb/
206Pb1σ 207Pb/
235U1σ 206Pb/
238U1σ SF-4-4 4.1 77 218 645 2.53 0.0535 0.0008 0.4352 0.0081 0.0587 0.0010 350.1 33 366.9 6 367.7 6 99% 4.2 73 198 637 2.80 0.0542 0.0007 0.4297 0.0075 0.0573 0.0009 376.0 31 363.0 5 359.1 6 98% 4.3 174 174 567 2.86 0.0710 0.0009 1.5618 0.0226 0.1592 0.0025 966.7 26 955.2 9 952.2 14 99% 4.4 36 98 332 2.91 0.0541 0.0009 0.4337 0.0084 0.0580 0.0009 372.3 32 365.8 6 363.3 5 99% 4.5 153 360 345 0.83 0.0570 0.0009 0.6663 0.0118 0.0845 0.0011 500.0 35 518.4 7 523.0 7 99% 4.6 38 102 322 2.74 0.0599 0.0013 0.4622 0.0111 0.0559 0.0009 611.1 48 385.8 8 350.4 6 90% 4.7 81 242 704 2.63 0.0561 0.0010 0.4300 0.0083 0.0557 0.0010 457.5 39 363.2 6 349.5 6 96% 4.8 62 172 523 2.66 0.0547 0.0007 0.4384 0.0084 0.0580 0.0010 398.2 30 369.1 6 363.2 6 98% 4.9 692 646 1125 1.50 0.0796 0.0008 2.2063 0.0259 0.2007 0.0029 1187.0 20 1183.0 8 1179.3 15 99% 4.10 62 181 469 2.34 0.0547 0.0008 0.4374 0.0081 0.0578 0.0009 398.2 35 368.4 6 362.5 6 98% 4.11 109 347 759 1.89 0.0526 0.0007 0.4115 0.0066 0.0568 0.0012 322.3 31 350.0 5 356.4 7 98% 4.12 20 49 168 3.01 0.0564 0.0012 0.4672 0.0128 0.0598 0.0012 477.8 48 389.2 9 374.3 7 96% 4.13 37 109 192 1.53 0.0541 0.0012 0.4815 0.0131 0.0645 0.0016 376.0 53 399.1 9 403.0 10 99% 4.14 105 230 1137 4.25 0.0578 0.0035 0.5333 0.0312 0.0672 0.0013 520.4 133 434.0 21 419.2 8 96% 4.15 205 610 802 1.17 0.0626 0.0009 0.5651 0.0073 0.0660 0.0011 694.5 30 454.9 5 411.8 7 90% 4.16 46 56 672 10.11 0.0577 0.0007 0.5348 0.0083 0.0672 0.0010 520.4 26 435.0 5 419.1 6 96% 4.17 187 514 966 1.86 0.0552 0.0007 0.5051 0.0081 0.0663 0.0010 420.4 31 415.1 5 414.0 6 99% 4.18 409 350 666 1.62 0.0851 0.0010 2.5400 0.0412 0.2167 0.0033 1318.2 24 1283.6 12 1264.4 18 98% 4.19 109 107 279 2.20 0.0763 0.0011 1.9758 0.0305 0.1887 0.0030 1102.8 28 1107.3 10 1114.4 16 99% 4.20 62 175 618 3.03 0.0540 0.0008 0.4335 0.0070 0.0584 0.0009 372.3 64 365.7 5 365.9 6 99% 4.21 57 154 336 1.88 0.0568 0.0011 0.5109 0.0110 0.0653 0.0008 483.4 43 419.0 7 407.6 5 97% 4.22 61 73 96 1.14 0.0736 0.0012 1.7083 0.0379 0.1682 0.0027 1031.5 33 1011.6 14 1002.0 15 99% 4.23 89 266 741 2.42 0.0546 0.0006 0.4286 0.0066 0.0570 0.0009 398.2 31 362.2 5 357.3 5 98% 4.24 73 114 84 0.71 0.0668 0.0015 1.2197 0.0307 0.1333 0.0027 831.5 48 809.6 14 806.6 15 99% 4.25 55 103 1043 8.68 0.0538 0.0008 0.4269 0.0083 0.0576 0.0011 361.2 33 361.0 6 360.9 7 99% 4.26 269 101 271 2.34 0.1448 0.0017 8.1813 0.1610 0.4093 0.0072 2287.0 20 2251.3 18 2211.6 33 98% 4.27 118 99 157 1.38 0.0848 0.0011 2.6860 0.0493 0.2297 0.0036 1322.2 25 1324.6 14 1332.9 19 99% 4.28 103 279 1106 3.41 0.0552 0.0007 0.4440 0.0070 0.0584 0.0009 420.4 31 373.1 5 366.0 5 98% 4.29 253 201 666 3.21 0.0784 0.0015 2.0360 0.0721 0.1879 0.0057 1166.7 39 1127.6 24 1109.8 31 98% 4.30 134 107 638 5.20 0.0713 0.0010 1.6384 0.0293 0.1668 0.0028 968.5 28 985.1 11 994.5 15 99% 3.1 34 71 314 3.88 0.0630 0.0012 0.6636 0.0201 0.0757 0.0014 705.6 41 516.8 12 470.5 8 90% 3.2 233 286 421 1.34 0.0716 0.0008 1.6074 0.0246 0.1627 0.0023 975.9 24 973.1 10 972.0 13 99% 3.3 171 72 378 4.72 0.1168 0.0014 5.1471 0.0815 0.3200 0.0053 1909.3 21 1843.9 13 1789.8 26 97% 3.4 59 171 402 2.06 0.0544 0.0009 0.4502 0.0086 0.0599 0.0008 390.8 40 377.4 6 374.8 5 99% 3.5 136 105 596 5.13 0.0757 0.0009 1.7701 0.0324 0.1689 0.0027 1088.6 29 1034.6 12 1005.9 15 97% 3.6 106 84 313 3.46 0.0805 0.0010 2.3741 0.0434 0.2130 0.0032 1209.3 26 1234.8 13 1244.5 17 99% 3.7 39 105 420 3.68 0.0557 0.0008 0.4857 0.0098 0.0632 0.0012 438.9 36 402.0 7 395.3 7 98% 3.8 96 303 708 2.12 0.0543 0.0008 0.4350 0.0072 0.0581 0.0009 383.4 33 366.7 5 364.2 6 99% 3.9 67 206 602 2.61 0.0536 0.0007 0.4235 0.0064 0.0573 0.0007 353.8 30 358.6 5 359.0 5 99% 3.10 90 283 650 2.04 0.0539 0.0007 0.4370 0.0069 0.0586 0.0006 364.9 25 368.1 5 367.2 4 99% 3.11 82 220 492 2.00 0.0547 0.0008 0.5221 0.0087 0.0693 0.0010 398.2 33 426.5 6 432.1 6 98% 3.12 57 69 137 1.87 0.0730 0.0013 1.6357 0.0403 0.1618 0.0027 1013.0 37 984.0 16 966.7 15 98% 3.13 40 47 316 6.00 0.0618 0.0008 0.9406 0.0144 0.1103 0.0014 733.3 28 673.2 8 674.4 8 99% 3.14 50 153 389 2.29 0.0538 0.0008 0.4345 0.0077 0.0584 0.0007 361.2 31 366.3 5 365.8 4 99% 3.15 52 159 406 2.30 0.0535 0.0009 0.4311 0.0073 0.0585 0.0007 350.1 39 363.9 5 366.5 5 99% 3.16 48 149 388 2.39 0.0538 0.0008 0.4434 0.0083 0.0597 0.0009 361.2 33 372.6 6 373.6 5 99% 3.17 110 227 532 2.13 0.0545 0.0008 0.5705 0.0105 0.0757 0.0012 394.5 36 458.4 7 470.5 7 97% 3.18 138 154 412 2.57 0.0700 0.0009 1.6293 0.0291 0.1685 0.0028 927.8 32 981.6 11 1003.7 15 97% 3.19 80 199 664 2.95 0.0556 0.0008 0.5359 0.0101 0.0697 0.0010 435.2 6 435.7 7 434.4 6 99% 3.20 169 435 817 1.85 0.0551 0.0007 0.5731 0.0120 0.0756 0.0016 416.7 28 460.0 8 469.6 10 97% 3.21 44 131 435 2.96 0.0540 0.0009 0.4364 0.0081 0.0586 0.0008 372.3 31 367.7 6 366.8 5 99% 3.22 30 80 203 2.26 0.0552 0.0009 0.5190 0.0108 0.0681 0.0010 420.4 37 424.5 7 424.4 6 99% 3.23 190 512 1237 2.18 0.0572 0.0007 0.5405 0.0086 0.0685 0.0010 501.9 28 438.8 6 427.4 6 97% 3.24 99 319 680 2.06 0.0534 0.0007 0.4341 0.0085 0.0589 0.0008 346.4 27 366.1 6 368.9 5 99% 3.25 63 155 882 5.06 0.0536 0.0007 0.4381 0.0075 0.0594 0.0009 353.8 31 368.9 5 372.0 5 99% 3.26 125 333 766 2.03 0.0558 0.0007 0.5430 0.0095 0.0706 0.0010 442.6 28 440.4 6 439.6 6 99% 3.27 302 105 716 6.54 0.1190 0.0015 5.4236 0.1149 0.3291 0.0049 1940.4 21 1888.6 18 1834.0 24 97% 3.28 106 279 598 1.90 0.0564 0.0008 0.5535 0.0079 0.0713 0.0009 477.8 30 447.3 5 444.1 6 99% 3.29 28 82 220 2.41 0.0570 0.0011 0.4669 0.0083 0.0595 0.0008 500.0 41 389.0 6 372.8 5 95% 3.30 96 296 857 2.62 0.0548 0.0007 0.4355 0.0066 0.0575 0.0007 405.6 21 367.1 5 360.2 4 98% 
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