Determination of the Nanhua System volcanic rocks in Anyi on the western margin of the Yangtze Block
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摘要:
扬子陆块西缘安益大湾山地区出露一套由变质玄武岩等组成的变质基性火山岩，前人将其归为中元古界，并作为寻找磁铁矿的主要对象。调查发现，安益大湾山变质基性火山岩与下伏浅变质岩系间发育一套稳定沉积的砾岩。应用LA-ICP-MS技术对其底砾岩之上最底部的变质玄武岩进行了锆石U-Pb年龄测定，获得了781.3±1.9Ma的岩浆锆石206Pb/238U年龄加权平均值和1008±14Ma、1142±15Ma、2714±10Ma的继承性岩浆锆石207Pb/206Pb年龄，指示该套变质基性火山岩形成于南华纪，并将其从浅变质岩系中解离出来，对比为澄江组。继承性锆石年龄数据指示，扬子地块西缘安益地区存在新太古界和中元古界物质记录。结合前人研究成果和近来获得的年龄数据，将滇中澄江组的时代界定于820~740Ma，并将南华系的底界界定于820Ma。大湾山中-大型磁铁矿产于扬子地块西缘澄江组的变质基性火山岩中，其主成矿期为南华纪，可能属于热液氧化物-铜-金矿床。
Abstract:Metamorphic basic volcanic rocks composed of metamorphic basalts and some other rocks are exposed in the Dawanshan area of Anyi on the western margin of the Yangtze Block. Due to the lack of geochronologic data, previous researchers classified these rocks as belonging to the Middle Proterozoic and considered them as the main target for magnetite prospecting. The authors found that a stable sedimentary conglomerate is developed between the metamorphic basic volcanic rocks and the underlying metamorphic rocks in the Dawanshan area of Anyi. LA-ICP-MS tech was applied to measuring the U-Pb age of zircons from metamorphic basalt above most conglomerates. The 206Pb/238U weighted average values of 781.3±1.9Ma, and 1008±14Ma, 1142±15Ma, 2714±10Ma for 207Pb/206Pb ages of inherited magma zircon were obtained, suggesting that the metamorphic basic volcanic rocks were formed in Nanhua epoch. The authors separated them from the shallow metamorphic rock series and assigned them to Chengjiang Formation through correlation. The ages of the inherited zircons and the geological characteristics of this region suggest that the Neoarchean and Mesoproterozoic material records exist in the Anyi area on the western margin of the Yangtze Block. Based on previous research results and the age of tuff obtained from Chengjiang Formation by the authors, the temporal boundary of Chengjiang Formation in central Yunnan was defined at 820~740Ma, and the age of the bottom of Nanhua System was defined at 820Ma. Dawanshan middlelarge magnetite was produced in the metamorphic basic volcanic rocks of Chengjiang Formation on the western margin of the Yangtze Block. The main ore-forming activity occurred in the Nanhua period and may belong to the IOCG deposit.
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表 1 滇中澄江组火山岩锆石U-Pb年龄
Table 1. Zircon U-Pb ages of the volcanic rocks from Chengjiang Formation in central Yunnan Province
测点编号 含量/10-6 同位素比值 年龄/Ma Pb U 232Th/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 误差% 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ D1202-1-1（灰绿色变质玄武岩） 1 38 240 1.3421 0.0022 0.0651 0.0006 1.1577 0.0115 0.1290 0.0007 0.62 777 18 781 8 782 4 2 39 238 1.6220 0.0047 0.0653 0.0006 1.1584 0.0107 0.1287 0.0006 0.18 784 19 781 7 780 4 3 53 303 1.9180 0.0094 0.0653 0.0005 1.1571 0.0089 0.1288 0.0007 0.49 780 15 781 6 781 4 4 29 184 1.3854 0.0314 0.0653 0.0006 1.1579 0.0107 0.1285 0.0007 1.72 785 18 781 7 780 5 5 21 148 0.9615 0.0103 0.0655 0.0008 1.1627 0.0137 0.1287 0.0006 0.46 791 24 783 9 780 4 6 33 243 0.6449 0.0047 0.0654 0.0005 1.1594 0.0091 0.1286 0.0007 0.22 786 16 782 6 780 4 7 46 292 1.5923 0.0078 0.0655 0.0005 1.1602 0.0100 0.1284 0.0007 0.16 791 17 782 7 779 4 8 27 182 1.2220 0.0020 0.0656 0.0006 1.1608 0.0130 0.1284 0.0007 0.40 792 20 782 9 779 4 9 31 205 1.4871 0.0110 0.0651 0.0006 1.1555 0.0118 0.1287 0.0008 0.27 778 20 780 8 780 5 10 25 359 1.1981 0.0108 0.0318 0.0005 0.2888 0.0041 0.0659 0.0003 0.25 -984 42 258 4 411 2 11 36 223 1.6439 0.0026 0.0651 0.0006 1.1542 0.0110 0.1287 0.0007 0.32 776 20 779 7 780 4 12 53 286 2.6224 0.0892 0.0654 0.0012 1.1622 0.0215 0.1288 0.0008 1.64 788 39 783 14 781 5 13 18 218 0.8920 0.0113 0.0597 0.0008 0.5894 0.0083 0.0717 0.0004 0.63 591 30 470 7 446 2 14 21 132 1.2718 0.0037 0.0653 0.0009 1.1632 0.0164 0.1291 0.0007 0.34 785 29 783 11 783 4 15 278 485 0.4994 0.0008 0.1868 0.0012 13.4295 0.0862 0.5314 0.0025 0.15 2714 10 2710 17 2705 13 16 47 337 1.0279 0.0026 0.0653 0.0005 1.1638 0.0102 0.1293 0.0008 0.25 784 16 784 7 784 5 17 32 219 1.1154 0.0033 0.0649 0.0006 1.1573 0.0113 0.1293 0.0006 0.38 772 20 781 8 784 4 18 70 453 1.4441 0.0094 0.0649 0.0006 1.1557 0.0111 0.1291 0.0007 0.18 772 19 780 7 783 4 19 35 226 1.3293 0.0066 0.0649 0.0009 1.1685 0.0207 0.1305 0.0011 1.22 773 28 786 14 791 6 20 84 556 1.3580 0.0139 0.0653 0.0004 1.1604 0.0090 0.1290 0.0007 0.20 783 14 782 6 782 4 21 49 329 1.1598 0.0091 0.0657 0.0005 1.1665 0.0096 0.1288 0.0007 0.38 796 16 785 6 781 4 22 58 389 1.1884 0.0022 0.0653 0.0005 1.1596 0.0088 0.1287 0.0007 0.19 785 15 782 6 781 4 23 61 334 0.6855 0.0035 0.0728 0.0005 1.6283 0.0116 0.1622 0.0008 0.24 1008 14 981 7 969 5 24 35 197 0.4253 0.0004 0.0778 0.0006 1.8163 0.0150 0.1693 0.0010 0.48 1142 15 1051 9 1008 6 25 72 471 1.2648 0.0028 0.0653 0.0004 1.1594 0.0083 0.1288 0.0006 0.17 784 14 782 6 781 4 
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表 2 滇中澄江组火山岩锆石U-Pb年龄
Table 2. Zircon U-Pb ages of the volcanic rocks from Chengjiang Formation in central Yunnan Province
采样位置 层位 岩性 定年方法 年龄/Ma 数据来源 牟定安益 澄江组/路古模岩组界面上2m，顶界以下厚度不清 玄武岩 LA-ICP-MS锆石U-Pb 781.3±1.9 本文 武定罗茨 未见底，南沱组/澄江组界面之下玄武岩底界 玄武岩 LA-ICP-MS锆石U-Pb 804±6 文献[45] 巧家新店乡谓姑村 澄江组/黄草岭组界面上462m，灯影组/澄江组界面之下173.5m 凝灰岩 LA-ICP-MS锆石U-Pb 785±12
828±8.3文献[17] 滇中澄江 底界之上厚度不清，南沱组/澄江组界面之下20m 凝灰岩 LA-ICP-MS锆石U-Pb 819±14
781±11
725±11文献[16] 东川中河 底界之上厚度不清，陡山沱组/澄江组界面之下1132m 凝灰岩 LA-ICP-MS锆石U-Pb 803.1±8.7 文献[15] 东川金阳松林坪 澄江组/黄草岭组界面上189m，南沱组/澄江组界面之下296m 凝灰岩 LA-ICP-MS锆石U-Pb 797.8±8.2 文献[15] 武定罗茨 未见底，南沱组/澄江组界面之下玄武岩底界 玄武岩 全岩Rb-Sr 887 文献[51] 武定罗茨 未见底，南沱组/澄江组界面之下玄武岩底界 玄武岩 全岩Rb-Sr 885 文献[13] 玉溪易门六街 澄江组/黑山组界面上30m，顶界以下厚度不清 凝灰岩 LA-ICP-MS锆石U-Pb 812.1±5.5 未发表数据
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