U-Pb age of zircon from metamorphic rocks of the Tuanliangzi Formation in western Yunnan Province and its tectonic significance
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摘要:
滇西云县-景洪一带广泛出露的中元古界团梁子岩组是一套与扬子基底岩系密切相关的中低变质沉积岩夹火山岩系，其形成时代、沉积充填序列及大地构造属性一直存在争议。出露于云县漫湾地区的团梁子岩组发育厚数米的绿片岩（原岩玄武岩）及绢云石英千枚岩（原岩流纹岩）。采集绢云石英千枚岩样品进行LA-ICP-MS锆石U-Pb定年，分别获得1497±14Ma的岩浆结晶年龄和893±17.3Ma、425±15.7Ma、321±27Ma的变质年龄。认为团梁子岩组中以绿片岩、绢云石英千枚岩为主体的原始沉积岩系形成于中元古代中期，在新元古代全球性的格林威尔造山过程中被青白口纪花岗岩侵入并发生变质作用；在古特提斯洋俯冲过程中，经历古生代造弧作用；同时还获单颗粒2310±15Ma的碎屑锆石，推测滇西云县地区应存在古元古代的结晶基底，由此可知，团梁子岩组应是扬子陆块褶皱基底岩系的组成部分。
Abstract:The Middle Proterozoic Tuanliangzi Formation, widely exposed in the Yunxian-Jinghong area of western Yunnan, consists of a set of low and medium metamorphic sedimentary rocks intercalated with the Yangtze basement rock series. Its formation age, sedimentary filling sequence and tectonic attributes have been controversial. The Tuanliangzi Formation exposed in Manwan area of Yunxian County contains basalt and sericite quartz phyllite, several meters in thickness. In this study, the LA-ICP-MS zircon U-Pb dating of sericite quartz phyllite(D1016) was carried out, and the magmatic crystallization age of 1497±14Ma and the metamorphic age of 893±17.3Ma, 425±15.7Ma and 321±27Ma were obtained respectively. It is considered that the original sedimentary rock series in the Tuanliangzi Formation, mainly composed of greenschist and sericite quartz phyllite, were formed in the middle of the Mesoproterozoic period, and were intruded and metamorphosed by the Qingbaikou granite during the Neoproterozoic global Greenwell orogenic process. During the Paleo-Tethys Ocean subduction, the Paleozoic arc metamorphism was experienced, and a single grain of 2310±15Ma detrital zircon was obtained. It is inferred that there should be an ancient crystalline basement of Guyuan in Yunxian area, western Yunnan. It can be concluded that Tuanliangzi Formation is an integral part of the folded basement rock series of Yangzi continental block.
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表 1 样品锆石LA-ICP-MSU-Th-Pb同位素测试数据
Table 1. LA-ICP-MS zircon U-Th-Pb analytical data of the sample
测点号 元素含量/10-6 同位素比值 U-Pb年龄/Ma 谐和度 Th/U 采用年龄/Ma Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 1 439.6 765.4 0.0509 0.0011 0.3685 0.0103 0.0530 0.0017 235 48.1 319 7.6 333 10.1 95% 0.57 333 2 86.8 387.4 0.0930 0.0014 3.7295 0.0973 0.2904 0.0069 1489 27.8 1578 20.9 1644 34.4 95% 0.22 1489 3 118.9 236.9 0.0909 0.0015 3.5667 0.0589 0.2855 0.0055 1456 31 1542 13.1 1619 27.7 95% 0.50 1456 4 173.5 655.4 0.0866 0.0012 3.0567 0.0754 0.2574 0.0069 1350 26.7 1422 18.9 1476 35.3 96% 0.26 1350 5 345.3 572.9 0.0930 0.0012 3.1023 0.0585 0.2425 0.0045 1487 30.1 1433 14.5 1399 23.5 97% 0.60 1487 6 465.5 474.2 0.0967 0.0013 3.5649 0.0908 0.2684 0.0068 1561 26 1542 20.2 1533 34.7 99% 0.98 1561 7 127.2 1276.5 0.0929 0.0023 2.2688 0.0547 0.1816 0.0054 1487 46.8 1203 17.0 1076 29.4 88% 0.10 1487 8 164.7 187.6 0.1126 0.0017 5.0221 0.0977 0.3248 0.0055 1843 28.1 1823 16.5 1813 26.7 99% 0.88 1843 9 132.9 619.9 0.0961 0.0020 3.6494 0.0991 0.2849 0.0162 1550 38.6 1560 21.7 1616 81.5 96% 0.21 1550 10 161.7 930.2 0.0941 0.0025 2.7365 0.2036 0.1962 0.0130 1510 50 1338 55.3 1155 70.2 85% 0.17 1510 11 264.0 748.9 0.1046 0.0012 3.8147 0.0738 0.2647 0.0049 1706 21.6 1596 15.6 1514 25.0 94% 0.35 1706 12 132.7 220.8 0.1147 0.0016 5.4675 0.0902 0.3466 0.0058 1876 25.5 1896 14.2 1918 28.0 98% 0.60 1876 13 375.6 306.6 0.1066 0.0018 4.5665 0.1082 0.3151 0.0119 1742 31.8 1743 19.8 1766 58.3 98% 1.22 1742 14 53.2 1606.6 0.0598 0.0009 0.4036 0.0094 0.0496 0.0018 598 33.3 344 6.8 312 10.9 90% 0.03 312 15 250.6 878.9 0.0776 0.0010 1.5921 0.0356 0.1486 0.0031 1136 25.5 967 14.0 893 17.3 92% 0.29 893 16 86.2 280.5 0.1197 0.0020 5.8486 0.1794 0.3552 0.0092 1954 29.6 1954 26.6 1959 43.9 99% 0.31 1954 17 175.5 1230.8 0.0934 0.0022 1.3350 0.0714 0.1010 0.0041 1498 45.5 861 31.1 620 24.1 67% 0.14 620 18 112.0 332.7 0.0579 0.0013 0.3875 0.0127 0.0485 0.0010 524 50.0 333 9.3 305 6.2 91% 0.34 305 19 226.1 523.8 0.0939 0.0017 3.7889 0.0789 0.3035 0.0153 1506 35.2 1590 16.8 1708 75.6 92% 0.43 1506 20 286.3 815.6 0.0578 0.0010 0.4278 0.0106 0.0537 0.0011 520 38.9 362 7.6 337 6.6 92% 0.35 337 21 148.2 320.2 0.1137 0.0011 4.8723 0.0579 0.3109 0.0039 1859 17.1 1797 10.1 1745 19.3 97% 0.46 1859 22 181.2 551.5 0.0955 0.0012 3.1284 0.0924 0.2363 0.0064 1539 23.3 1440 22.7 1368 33.4 94% 0.33 1539 23 409.1 894.9 0.0939 0.0015 3.4670 0.0825 0.2778 0.0146 1506 30.1 1520 18.8 1580 73.7 96% 0.46 1506 24 131.5 709.4 0.0548 0.0008 0.5106 0.0179 0.0681 0.0026 406 33.3 419 12.1 425 15.7 98% 0.19 425 25 590.7 580.8 0.1085 0.0015 5.0252 0.0988 0.3420 0.0125 1776 24.8 1824 16.7 1896 60.1 96% 1.02 1776 26 171.0 534.3 0.0922 0.0010 2.8271 0.0644 0.2214 0.0042 1472 20.4 1363 17.1 1289 22.0 94% 0.32 1472 27 153.2 232.6 0.0964 0.0017 3.8935 0.0945 0.3089 0.0217 1555 33.0 1612 19.6 1735 10.6 92% 0.66 1555 28 286.5 650.6 0.1469 0.0017 8.1249 0.2651 0.3992 0.0119 2310 14.7 2245 29.5 2165 54.7 96% 0.44 2310 29 134.8 724.2 0.0928 0.0010 2.8958 0.0429 0.2261 0.0038 1484 21.4 1381 11.2 1314 20.0 95% 0.19 1484 30 105.2 731.0 0.0906 0.0012 1.8749 0.0675 0.1491 0.0051 1439 25 1072 23.8 896 28.5 82% 0.14 1439 31 210.2 1120.5 0.0933 0.0012 3.3144 0.0568 0.2561 0.0037 1494 7.9 1484 13.4 1470 18.8 99% 0.19 1494 32 46.4 1013.1 0.0930 0.0013 2.1278 0.0444 0.1660 0.0037 1487 30.4 1158 14.4 990 20.4 84% 0.05 1487 33 87.6 552.9 0.0943 0.0012 3.2554 0.0453 0.2506 0.0042 1513 25 1470 10.9 1441 21.9 98% 0.16 1513 34 122.2 276.1 0.0531 0.0009 0.4404 0.0094 0.0602 0.0013 332 37.0 371 6.6 377 7.6 98% 0.44 377 
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