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海南三亚中元古代变质砾岩的发现及其对Columbia超大陆裂解的指示

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赵小明, 胡在龙, 裴毅俊, 袁海军, 邱啸飞, 吴年文, 姚华舟. 海南三亚中元古代变质砾岩的发现及其对Columbia超大陆裂解的指示[J]. 地质通报, 2021, 40(6): 880-888.
引用本文: 赵小明, 胡在龙, 裴毅俊, 袁海军, 邱啸飞, 吴年文, 姚华舟. 海南三亚中元古代变质砾岩的发现及其对Columbia超大陆裂解的指示[J]. 地质通报, 2021, 40(6): 880-888.
shu
ZHAO Xiaoming, HU Zailong, PEI Yijun, YUAN Haijun, QIU Xiaofei, WU Nianwen, YAO Huazhou. Recognition of metamorphic conglomerate in the Sanya area of Hainan Island and its indicator to breakup of the Columbia supercontinent[J]. Geological Bulletin of China, 2021, 40(6): 880-888.
Citation: ZHAO Xiaoming, HU Zailong, PEI Yijun, YUAN Haijun, QIU Xiaofei, WU Nianwen, YAO Huazhou. Recognition of metamorphic conglomerate in the Sanya area of Hainan Island and its indicator to breakup of the Columbia supercontinent[J]. Geological Bulletin of China, 2021, 40(6): 880-888.
shu

海南三亚中元古代变质砾岩的发现及其对Columbia超大陆裂解的指示

  • 1.

    中国地质调查局武汉地质调查中心/中南地质科技创新中心, 湖北 武汉 430223

  • 2.

    海南省地质调查院, 海南 海口 570206

  • 3.

    中国地质大学(武汉)地质调查院, 湖北 武汉 430074

  • 基金项目:
    中国地质调查局项目《地质调查综合智能编图系统与应用》（编号：DD20190415）、《桂东-粤西成矿带云开—抱板地区地质矿产调查》（编号：DD20160351）和国家自然科学基金项目《海南岛古特提斯洋壳的地层古生物判据及海西期构造演化》（批准号：41672030）、《早三叠世海、陆相地层对比及生物-环境演变过程》（批准号：41530104）
详细信息
    作者简介: 赵小明(1970-), 男, 博士, 研究员, 从事地层古生物学调查和科研工作。E-mail: zxm20040021@163.com

  • 中图分类号: P534.3;P588.21+2.5

Recognition of metamorphic conglomerate in the Sanya area of Hainan Island and its indicator to breakup of the Columbia supercontinent

  • 1.

    Wuhan Center, China Geological Survey/Central South China Innovation Center for Geosciences, Wuhan 430223, Hubei, China

  • 2.

    Hainan Institute of Geological Survey, Haikou 570206, Hainan, China

  • 3.

    Institute of Geological Survey, China University of Geoscicences, Wuhan 430074, Hubei, China

    摘要

  • 海南岛中元古代沉积记录对于探讨华南陆块早期大陆演化过程起关键作用。对海南三亚三郎岭地区奥陶系干沟村组砂岩-板岩组合中的变砾岩形成时代进行了重新厘定。碎屑锆石U-Pb同位素年龄分析结果表明，65颗锆石207Pb/206U年龄范围为2691~1350 Ma，且分成2691~2444 Ma、1838~1632 Ma、1540~1350 Ma三组，形成约1699 Ma、约1440 Ma 2个主要峰值和约2461 Ma的1个次要峰值。基于最年轻锆石年龄为1350 Ma，且没有出现海南岛常见的1250~1100 Ma和1000~900 Ma年龄记录，将该套变质砾岩沉积时代限定在1350~1250 Ma，而并非前人划属的奥陶纪，这是海南岛首次发现中元古代的砾岩建造。该套变砾岩砾石成分成熟度高、结构成熟度中等，表现为裂谷盆地高密度的碎屑流沉积特征，是研究区Columbia超大陆裂解晚期的沉积响应。变质砾岩与劳伦大陆西部的Belt-Purcell超群下部沉积地层具有相似的碎屑锆石年龄组成和年龄谱特征，暗示中元古代哥伦比亚超大陆中，海南岛与劳伦西部靠近。

    Mesoproterozoic sedimentary records in the Hainan Island are significant for discussing the continental crust evolution of the South China Massif.In our studies, the formation age of metamorphic conglomerate in the sandstone-slate combination of the Ordovician Gangoucun Formation in the Sanlangling area of the Sanya city, Hainan Island, were redetermined.Total 65 detrital zircons from the conglomerate were measured for U-Pb dating.The U-Pb ages of the zircons range from 2691 Ma to 1350 Ma, and are clustered at 2691~2444 Ma, 1838~1632 Ma, and 1540~1350 Ma, with two main peaks at ~1699 Ma and ~1440 Ma and a subordinary peak at ~2461 Ma.Based on the youngest detrital zircon age of ~1350 Ma for the conglomerate, without 1250~1100 Ma and 1000~900 Ma age records which are common in the Hainan Island, it is suggested that the metamorphic conglomerate was deposited at 1350~1250 Ma.This is the first time that a Mesoproterozoic conglomerate formation has been recognized on Hainan Island, rather than the Ordovician sedimentary rocks previously classified.The metamorphic conglomerates have high compositional maturity and middle texture maturity, which are consistent with the sedimentary features of high-density debris flow in the rift basin.They might represent the sedimentary response to the final breakup of the Columbia supercontinent in the Hainan Island.

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  • 图 1  研究区地质简图(据参考文献[13]修改)

    Figure 1. 

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    图 图版Ⅰ   

    Figure 图版Ⅰ. 

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    图 2  变质砾岩代表性锆石阴极发光(CL)图像及其U-Pb年龄

    Figure 2. 

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    图 3  三亚三郎岭地区变质砾岩碎屑锆石U-Pb年龄谐和图和直方图

    Figure 3. 

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    图 4  海南岛前寒武纪碎屑锆石U-Pb年龄谱

    Figure 4. 

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    表 1  海南三亚三郎岭地区变质砾岩LA-ICP-MS锆石U-Th-Pb分析结果

    Table 1.  LA-ICP-MS zircon U-Th-Pb isotope data of metaconglomerate in Sanlangling area, Sanya city, Hainan

    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/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ
    01 272.8 150.7 665.7 0.226 0.095 0.002 3.159 0.096 0.249 0.009 1521 45 1447 23 1435 47 99%
    02 82.1 60.6 107.7 0.563 0.089 0.002 3.032 0.083 0.247 0.004 1398 32 1416 21 1426 21 99%
    03 96.7 48.3 150.7 0.321 0.105 0.002 4.583 0.141 0.314 0.006 1721 25 1746 26 1762 27 99%
    04 176.5 104.6 262.8 0.398 0.108 0.002 4.161 0.164 0.279 0.008 1766 40 1666 32 1588 38 95%
    05 91.2 66.5 130.9 0.508 0.087 0.002 2.976 0.113 0.248 0.004 1367 44 1401 29 1430 23 98%
    06 92.0 58.9 110.6 0.533 0.101 0.002 3.903 0.163 0.281 0.006 1635 45 1614 34 1598 30 98%
    07 374.1 271.0 897.7 0.302 0.087 0.002 2.592 0.104 0.216 0.004 1350 41 1299 29 1262 22 97%
    08 80.1 46.2 119.3 0.388 0.100 0.002 4.072 0.138 0.293 0.005 1632 38 1649 28 1658 25 99%
    09 209.7 76.9 105.4 0.730 0.184 0.003 12.308 0.356 0.484 0.008 2691 31 2628 27 2544 34 96%
    10 168.2 82.8 321.7 0.257 0.109 0.002 4.516 0.107 0.300 0.005 1787 24 1734 20 1691 24 97%
    11 62.9 32.6 99.7 0.327 0.104 0.002 4.388 0.098 0.305 0.005 1698 23 1710 19 1717 25 99%
    12 146.5 53.6 436.5 0.123 0.109 0.001 4.730 0.096 0.312 0.005 1791 26 1773 17 1752 25 98%
    13 171.1 90.1 309.7 0.291 0.106 0.001 4.331 0.063 0.296 0.004 1800 25 1699 12 1671 22 98%
    14 207.9 96.2 446.5 0.215 0.107 0.001 4.474 0.074 0.303 0.005 1750 20 1726 14 1708 26 98%
    15 87.1 52.3 104.6 0.500 0.112 0.001 4.727 0.093 0.305 0.007 1839 22 1772 16 1718 33 96%
    16 81.0 46.2 117.5 0.393 0.106 0.001 4.576 0.077 0.313 0.005 1728 22 1745 14 1758 23 99%
    17 271.7 177.3 430.0 0.412 0.108 0.001 4.640 0.096 0.313 0.007 1765 23 1757 17 1755 36 99%
    18 158.5 109.0 290.5 0.375 0.095 0.001 3.426 0.064 0.262 0.005 1520 22 1510 15 1502 24 99%
    19 84.2 59.8 149.9 0.399 0.091 0.001 3.225 0.063 0.256 0.004 1452 25 1463 15 1468 21 99%
    20 108.1 81.1 151.0 0.537 0.092 0.001 3.121 0.053 0.245 0.004 1473 29 1438 13 1414 19 98%
    21 177.9 103.1 216.6 0.476 0.109 0.001 4.868 0.071 0.324 0.005 1780 26 1797 12 1811 23 99%
    22 80.1 39.4 173.2 0.228 0.104 0.001 4.386 0.065 0.306 0.005 1700 20 1710 12 1719 24 99%
    23 139.2 48.6 142.5 0.341 0.159 0.002 10.281 0.163 0.468 0.007 2444 18 2460 15 2477 30 99%
    24 101.5 35.7 276.0 0.129 0.102 0.001 4.523 0.069 0.321 0.005 1665 22 1735 13 1793 22 96%
    25 236.1 172.9 428.6 0.403 0.089 0.001 3.103 0.049 0.252 0.005 1414 24 1433 12 1451 24 98%
    26 88.4 44.0 153.5 0.287 0.103 0.001 4.628 0.068 0.327 0.006 1676 22 1754 12 1824 27 96%
    27 124.4 65.6 218.6 0.300 0.104 0.001 4.351 0.075 0.303 0.006 1703 24 1703 14 1707 28 99%
    28 146.6 102.4 330.6 0.310 0.087 0.001 2.876 0.052 0.240 0.005 1361 8 1376 14 1388 24 99%
    29 184.2 115.1 253.0 0.455 0.102 0.001 4.164 0.069 0.296 0.004 1661 24 1667 14 1670 22 99%
    30 180.8 98.0 322.5 0.304 0.103 0.001 4.236 0.068 0.297 0.005 1683 22 1681 13 1675 24 99%
    31 141.7 49.3 410.4 0.120 0.103 0.001 4.300 0.067 0.301 0.004 1687 22 1693 13 1697 22 99%
    32 143.0 108.5 215.2 0.504 0.089 0.001 3.049 0.053 0.248 0.004 1406 25 1420 13 1429 21 99%
    33 185.3 107.5 256.6 0.419 0.102 0.001 4.273 0.062 0.305 0.004 1655 24 1688 12 1716 22 98%
    34 74.5 32.4 183.2 0.177 0.101 0.001 4.186 0.063 0.302 0.004 1635 19 1671 12 1699 21 98%
    35 470.3 214.8 856.6 0.251 0.108 0.001 4.920 0.071 0.332 0.005 1761 19 1806 12 1848 26 97%
    36 97.0 46.8 199.8 0.234 0.106 0.001 4.432 0.068 0.305 0.005 1727 24 1718 13 1716 22 99%
    37 322.7 178.4 453.0 0.394 0.111 0.001 5.147 0.084 0.335 0.005 1833 20 1844 14 1863 24 98%
    38 114.4 49.1 280.5 0.175 0.104 0.001 4.285 0.062 0.300 0.004 1700 16 1690 12 1693 20 99%
    39 94.9 43.0 249.6 0.172 0.105 0.001 3.986 0.060 0.276 0.004 1706 19 1631 12 1572 18 96%
    40 232.2 125.3 516.4 0.243 0.107 0.001 3.980 0.072 0.269 0.004 1754 22 1630 15 1535 20 93%
    41 86.3 50.8 93.5 0.544 0.108 0.001 4.798 0.076 0.321 0.004 1770 24 1785 13 1796 19 99%
    42 96.9 48.1 199.1 0.241 0.108 0.003 4.479 0.104 0.302 0.005 1766 46 1727 19 1703 25 98%
    43 393.1 345.2 517.8 0.667 0.091 0.001 2.871 0.042 0.228 0.003 1457 20 1374 11 1323 17 96%
    44 222.9 136.8 373.2 0.367 0.111 0.002 4.123 0.075 0.270 0.004 1814 29 1659 15 1539 19 92%
    45 368.6 119.9 412.7 0.290 0.160 0.002 10.179 0.126 0.463 0.006 2454 17 2451 11 2453 27 99%
    46 84.1 39.0 170.5 0.229 0.106 0.001 4.707 0.070 0.322 0.004 1729 20 1768 12 1801 21 98%
    47 292.8 263.6 297.2 0.887 0.089 0.001 2.852 0.042 0.233 0.004 1411 30 1369 11 1353 19 98%
    48 102.4 48.2 200.0 0.241 0.107 0.001 4.783 0.068 0.324 0.004 1747 19 1782 12 1809 21 98%
    49 109.5 51.1 224.9 0.227 0.106 0.002 4.669 0.069 0.328 0.012 1800 34 1762 12 1831 56 96%
    50 136.6 72.3 264.8 0.273 0.103 0.001 4.397 0.059 0.308 0.004 1684 19 1712 11 1733 20 98%
    51 169.9 88.3 312.5 0.283 0.104 0.001 4.622 0.065 0.321 0.005 1703 17 1753 12 1795 23 97%
    52 103.9 71.4 188.5 0.379 0.090 0.001 3.184 0.050 0.257 0.004 1433 18 1453 12 1474 21 98%
    53 95.3 42.4 221.8 0.191 0.105 0.001 4.479 0.059 0.311 0.004 1706 20 1727 11 1746 21 98%
    54 181.8 86.9 391.3 0.222 0.107 0.001 4.630 0.064 0.316 0.005 1746 23 1755 12 1768 25 99%
    55 276.9 96.6 269.3 0.359 0.161 0.002 10.667 0.172 0.480 0.008 2468 18 2495 15 2528 35 98%
    56 95.8 56.1 161.3 0.348 0.105 0.002 4.338 0.103 0.300 0.004 1706 37 1701 20 1693 20 99%
    57 273.1 159.1 341.9 0.465 0.108 0.001 4.807 0.058 0.322 0.004 1769 18 1786 10 1799 19 99%
    58 152.8 75.2 251.3 0.299 0.107 0.001 4.844 0.074 0.327 0.005 1767 20 1793 13 1824 25 98%
    59 126.1 74.4 164.6 0.452 0.105 0.001 4.565 0.066 0.316 0.005 1710 21 1743 12 1771 23 98%
    60 165.3 85.9 272.2 0.315 0.104 0.001 4.609 0.061 0.321 0.005 1698 20 1751 11 1795 22 97%
    61 179.8 83.9 405.5 0.207 0.102 0.001 4.309 0.066 0.306 0.004 1661 19 1695 13 1719 22 98%
    62 215.2 100.7 444.1 0.227 0.107 0.001 4.648 0.064 0.316 0.004 1743 19 1758 12 1769 20 99%
    63 285.6 161.0 474.9 0.339 0.104 0.001 4.274 0.055 0.299 0.004 1689 17 1688 11 1686 19 99%
    64 149.9 86.4 226.8 0.381 0.103 0.001 4.376 0.054 0.310 0.004 1673 19 1708 10 1739 21 98%
    65 106.9 76.8 102.0 0.753 0.096 0.001 3.754 0.055 0.285 0.003 1540 22 1583 12 1614 17 98%
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收稿日期:  2020-06-19
修回日期:  2020-07-17
刊出日期:  2021-06-15

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