U-Pb ages of zircon from metamorphic dolomite of the Wuliangshan Rock Group in Nanjian area, western Yunnan, and its tectonic significance
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摘要:
滇西南涧-云县一带广泛出露的无量山岩群是一套与三江特提斯造山带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。出露于南涧县公郎乡一带的无量山岩群发育有厚数厘米的变质英安岩夹层。对变质英安岩进行LA-ICP-MS锆石U-Pb定年，分别获得428.7±8.7Ma的岩浆结晶年龄和338~387Ma、250.5±8.1Ma、146.0±6.0Ma的变质年龄。认为无量山岩群原始沉积岩形成于志留纪，在古特提斯洋俯冲过程中，经历古生代造弧而发生区域变质作用，在白垩纪受热事件影响而发生热变质作用；同时还获得2034±22Ma、1140±16Ma、731±15Ma及469~522Ma的单颗粒锆石年龄，这些年代峰值与整个扬子陆块西缘获得的前寒武纪、古生代构造热事件年龄及分布特征基本可以对比；记录了Columbia、Rodinia和Gondwana超大陆的形成与裂解过程。
Abstract:The Wuliangshan Rock Group, which is widely exposed in the Nanjian-Yunxian area of western Yunnan, is a set of low and medium metamorphic sedimentary rocks intercalated with volcanic rocks closely related to the Sanjiang Tethys orogenic belt. Its formation age, sedimentary filling sequence and tectonic attributes have been controversial. The Wuliangshan Rock Group, exposed in Gonglong County and Nanjian County, has a metamorphic ananite intercalation several centimeters thick. The zircon U-Pb LAICP-MS dating of the metamorphic andesite Sample was carried out, and the magmatic crystallization age of 428.7±8.7Ma and the metamorphic age of 338~387Ma, 250.5 ±8.1Ma and 146.0 ±6.0Ma were obtained respectively. It is considered that the original sedimentary rocks of the Wuliangshan Rock Group were formed in Silurian and experienced regional metamorphism in the Palaeozoic arc forming process during the Paleo-Tethys Ocean subduction and thermal metamorphism in the Cretaceous period due to thermal events. At the same time, the single grain ages of 2034±22Ma, 1140±16Ma, 731±15Ma and 469~522Ma were obtained, which can be compared with the Precambrian, Paleozoic tectonic caloric event ages and distribution characteristics obtained from the western margin of the Yangtze block. It underwent the formation and breakup of Columbia, Rodinia and Gondwana supercontinent.
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致谢: 云南省地质调查院李静教授级高工认真审阅了本文并提出了详细修改意见，锆石LA-ICPMS分析得到南京宏创地矿袁秋云及湖北省地质实验室测试中心岩石矿物研究室朱丹、潘诗洋的帮助，审稿专家提出了宝贵的修改意见，在此一并表示衷心感谢。
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图 1 研究区大地构造位置（a）及采样位置（b）
N2s—三营组；J1y—漾江组；T3m—麦初箐组；T3wl—挖鲁八组；T3sh3—三合洞组三段；T3w2—歪古村组二段；T2m2—忙怀组二段；T2m1—忙怀组一段；Pz1W4—无量山岩群四段；Pz1W3—无量山岩群三段；Pz1W2—无量山岩群二段；Pz1W1—无量山岩群一段；Pt2t2—团梁子岩组二段；Pt2t1—团梁子岩组一段；Pt1Ca—崇山岩群a段；Pt1Cb—崇山岩群b段；ηγaT1—早三叠世细粒二长花岗岩；ηγcT3—三叠纪粗粒二长花岗岩；ηγbT3—三叠纪中粒二长花岗岩；ηγaT3—晚三叠世细粒二长花岗岩；ηγP2—二叠纪二长花岗岩；ηδP2—二叠纪花岗闪长岩
Figure 1. Geotectonic location of the study area(a)and sampling locations(b)
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图 2 变质英安岩野外露头（a、b）及显微照片（c、d）
Figure 2. Outcrop (a, b) and microphotographs (c, d) of the metamorphic dolomite
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图 4 样品锆石U-Pb谐和图和206Pb/238U年龄频谱图
Figure 4. U-Pb concordia diagrams and 206Pb/238U age histograms of zircons from the sample
表 1 变质英安岩LA-ICP-MS锆石U-Th-Pb同位素测试数据
Table 1 LA-ICP-MS zircon U-Th-Pb analytical data of the metamorphic dolomite
测点号 含量/10-6 同位素比值 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 1 401 481 0.051 0.007 0.167 0.019 0.024 0.001 243 28 157 17 156 5 99% 0.83 156 2 103 1511 0.048 0.005 0.146 0.014 0.022 0.001 100 23 138 12 142 4 96% 0.07 142 3 107 147 0.053 0.006 0.586 0.056 0.080 0.003 332 24 468 36 497 15 93% 0.73 497 4 257 464 0.054 0.004 0.533 0.039 0.072 0.002 372 18 433 26 445 9 97% 0.55 445 5 570 653 0.049 0.005 0.150 0.014 0.023 0.001 150 24 142 13 147 5 96% 0.87 147 6 454 610 0.049 0.008 0.139 0.018 0.022 0.001 167 34 132 16 139 5 95% 0.74 139 7 138 1524 0.053 0.004 0.290 0.022 0.041 0.001 339 19 258 17 257 5 99% 0.09 257 8 126 644 0.078 0.003 2.070 0.084 0.193 0.003 1146 82 1139 28 1140 16 99% 0.20 1140 91492270.2580.01014.4800.8430.4040.01632336327825521857375%0.65323310 233 1219 0.147 0.005 7.561 0.234 0.371 0.005 2317 54 2180 28 2034 22 93% 0.19 2034 115496930.0900.0070.7630.0590.0620.00114311557634389761%0.7938912 368 982 0.052 0.003 0.494 0.029 0.068 0.001 287 13 407 20 426 7 95% 0.37 426 13 396 541 0.049 0.007 0.151 0.017 0.023 0.001 165 29 143 15 148 4 96% 0.73 148 14 558 810 0.052 0.006 0.167 0.017 0.022 0.001 302 26 157 15 143 5 90% 0.69 143 15 228 283 0.058 0.008 0.335 0.044 0.042 0.002 528 50 294 34 266 10 90% 0.80 266 16 518 1680 0.060 0.005 0.446 0.033 0.054 0.001 611 16 375 23 338 8 89% 0.31 338 17 272 398 0.077 0.005 1.285 0.093 0.120 0.003 1111 13 839 41 731 15 86% 0.68 731 18 26.6 357 0.065 0.006 0.551 0.049 0.062 0.002 772 20 446 32 387 10 85% 0.07 387 192255620.1270.0063.5680.1560.2010.00320547715423511801873%0.40118020 363 135 0.059 0.008 0.661 0.085 0.084 0.003 554 29 515 52 522 16 98% 2.69 522 21 589 727 0.057 0.004 0.622 0.043 0.077 0.002 506 15 451 27 437 9 97% 0.81 437 22 140 634 0.055 0.005 0.496 0.039 0.066 0.002 409 19 409 26 409 9 99% 0.22 409 23 320 520 0.059 0.004 0.601 0.040 0.074 0.002 565 15 478 25 458 13 95% 0.62 458 24 675 1182 0.062 0.003 0.577 0.032 0.067 0.002 672 11 463 21 416 10 89% 0.57 416 25 31.5 161 0.056 0.008 0.468 0.073 0.067 0.004 456 32 390 50 418 25 92% 0.20 418 26 190 263 0.056 0.005 0.526 0.043 0.067 0.002 450 21 429 29 419 11 97% 0.72 419 27 161 291 0.057 0.005 0.528 0.042 0.067 0.002 500 18 431 28 419 9 97% 0.56 419 28 225 427 0.057 0.004 0.536 0.036 0.070 0.001 483 16 436 24 436 8 99% 0.53 436 29 288 531 0.057 0.003 0.595 0.032 0.076 0.001 476 12 474 21 469 7 99% 0.54 469 30 157 597 0.056 0.003 0.533 0.029 0.069 0.001 450 12 434 19 428 9 98% 0.26 428 31 362 595 0.051 0.004 0.275 0.021 0.039 0.001 256 20 246 17 247 6 99% 0.61 247 32 552 683 0.048 0.004 0.241 0.017 0.036 0.001 87 18 219 14 230 5 95% 0.81 230 33 943 830 0.051 0.003 0.277 0.019 0.039 0.001 232 16 248 15 246 5 99% 1.14 246 34 492 747 0.054 0.004 0.290 0.018 0.039 0.001 361 15 258 14 248 5 95% 0.66 248 注：删除线表示锆石年龄谐和度较低，年龄加权平均值计算中未使用该数据 
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