Detrital Zircon U-Pb Ages and Geological Significance of Metasedimentary Rocks from Guanjiagou Formation in Huoshenmiao Area, Mianlue Tectonic Belt of South Qinling
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摘要: 南秦岭勉略构造带南缘的略阳火神庙地区发育一套灰绿色绢云绿泥石英千枚岩、灰白色绢云钠长石英千枚岩和灰色黑云石英千枚岩的岩石组合.该套变质沉积岩系被前人划归关家沟组，但其原岩成岩时代和形成的构造环境都存在争议.采用LA-ICP-MS锆石U-Pb测年方法对从略阳火神庙地区关家沟组变质沉积岩中获得的碎屑锆石进行了研究，结果表明碎屑锆石的年龄介于932~723 Ma，主要年龄谱分别为727~723 Ma、760~758 Ma、897~809 Ma和932 Ma，主要峰值年龄为848 Ma，次要峰值年龄为725 Ma、758 Ma和932 Ma，最年轻的一组年龄为723~727 Ma（平均年龄为725 Ma），表明该地层的沉积时代应不早于南华纪.结合区域地质资料认为其碎屑物质的来源比较明确，主要来自勉略构造带和南侧碧口微地块内的岩浆岩，扬子板块北缘汉南地区出露的岩浆岩也为该地层提供了有限的物质.此次获得的碎屑锆石年龄较为集中，反映的皆为青白口纪到南华纪的年龄信息，结合前人对该区沉积地层的研究资料，认为其可能为一套裂谷环境的沉积地层.Abstract: A suit of gray-green sericite-chlorite-quartz phyllite, gray-white sericite-albite-quartz phyllite and gray biotite-quartz-phyllite is exposed in the Huoshenmiao area, Lueyang County. The sequence is previously regarded as the Guanjiagou Formation, but the depositional age and tectonic setting of the protolith are still in dispute. In this paper, detrital zircons from the metasedimentary rocks of the Guanjiagou Formation in the Huoshenmiao area were tested by LA-ICP-MS zircon U-Pb dating. The zircon U-Pb ages range from 932 to 723 Ma, and the main age groups are 727 to 723 Ma, 760 to 758 Ma, 897 to 809 Ma and 932 Ma, respectively; a peak at 848 Ma and the secondary peak ages at 725 Ma, 758 Ma and 932 Ma. The youngest age group is 723 Ma to 727 Ma (725 Ma on average), which indicates that the depositional age of this formation was not earlier than the Nanhua period. Combined with the regional geological data, it is proposed that the detrital material is mainly sourced from magmatic rocks within the Mianlue tectonic belt and Bikou microblock, and less from magmatic rocks exposed in the Hannan area and the northern margin of the Yangtze plate. It should be noticed that the ages of the detrital zircons are fairly concentrated, from Qingbaikou to Nanhua period. Combined with data of the sedimentary strata in this area, it is suggested that this sedimentary sequences might be deposited in a rift environment.
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图 1 勉略构造带及邻区构造简图(a), 研究区地质简图(b), 西秦岭勉略构造带地质图、地层柱状图及采样位置(c)
1.岷河组；2.略阳组；3.踏破组；4.早泥盆统地层；5.卓乌阔岩组；6.舟曲岩组；7.迭部岩组；8.大堡岩组；9.震旦系地层；10.关家沟组；11.秧田坝组上岩段；12.秧田坝组下岩段；13.阳坝组上岩段；14.阳坝组中岩段；15.陈家坝岩群；16.低庄沟岩组；17.沙坝岩组；18.鱼洞子岩群；19.中细-中粗粒黑云母二长花岗岩；20.闪长玢岩；21.蚀变中细粒花岗闪长岩；22.中细粒英云闪长岩；23.花岗片麻岩、黑云斜长片麻岩；24.辉绿玢岩；25.辉长岩；26.超基性岩(未分)；27.黑沟峡岩块；28.纸房沟岩块；29.五郎评岩块；30.中层状白云岩；31.黑云石英千枚岩；32.绢云钠长石英千枚岩；33.绢云绿泥石英千枚岩；34.绿泥绿帘钠长片岩；35.变辉长岩；36.绿泥钠长片岩；37.韧性断层；38.一、二、三级断层；39.采样位置.图a据李佐臣等(2013);图c据陕西省地质调查院(2007，1:25万略阳县幅)修编
Fig. 1. Simplified tectonic framework of Mianlue suture zone and its adjacent areas in northwest margin of the Yangtze block (a), geological map of the study area (b), simplified geological map, stratigraphic column and sampling location of Mianlue area in West Qinling orogen (c)
图 2 南秦岭勉略构造带火神庙地区关家沟组绢云绿泥石英千枚岩野外露头(a，b)和显微镜下单偏光和正交偏光照片(c，d)
Fig. 2. Outcrop photos (a, b) and microphotographs of sericite-chlorite-quartz phyllite (c, d) in Guanjiagou Formation, Mianlue tectonic belt in South Qinling
图 3 南秦岭勉略构造带火神庙地区关家沟组变质沉积岩碎屑锆石CL图像及表面年龄
Fig. 3. The zircon cathodoluminescence (CL) images and ages of metasedimentary (M332) in Guanjiagou Formation, Mianlue tectonic belt in South Qinling
图 4 南秦岭勉略构造带火神庙地区和康县地区关家沟组变质沉积岩碎屑锆石U-Pb年龄谐和图、直方图
Fig. 4. Zircon U-Pb concordia diagrams (a) and zircon U-Pb histograms for metasedimentary (M332) (b) in Guanjiagou Formation, Huoshenmiao area, Mianlue tectonic belt in South Qinling
表 1 勉略构造带及邻区部分岩体(火山岩)同位素年龄统计
Table 1. Partical ages of rock mass or metamorphic strata in Mianlue tectonic belt and adjacent areas
位置 岩体(火山岩) 岩性 测试方法 年龄(Ma) 资料来源 南秦岭勉略构造带 铧厂沟火山岩 英安岩 802.1±5.3 林振文等，2013 铧厂沟火山岩 玄武岩 801.7±4.7 林振文等，2013 水得沟火山岩 安山岩 LA-ICP-MS锆石U-Pb 804±20 徐通，2016 惠家沟火山岩 安山岩 797±14 徐通，2016 马家沟火山岩 英安岩 837±16 徐通，2016 琵琶寺变火山岩 绿帘绿泥片岩 783~754 李瑞保等，2009 大堡变镁铁质岩 基性熔岩 812±11 闫全人等，2007 香子坝变镁铁质岩 基性熔岩 841±16 闫全人等，2007 水泉沟变镁铁质岩 基性熔岩 826±19 闫全人等，2007 硖口驿基性岩体 辉长岩 SHRIMP锆石U-Pb 815±24 闫全人等，2007 偏桥沟花岗岩 斜长花岗岩 923±13 闫全人等，2007 大堡组火山岩 玄武岩 778~667 王涛，2008 观音岩基性岩体 辉绿岩 827±14 闫全人等，2007 碧口微地块 董家河蛇绿岩套 辉长岩 839.2±8.2 赖绍聪等，2007 白雀寺岩体 角闪石英二长岩 LA-ICP-MS锆石U-Pb 855±6 平先权等，2014 铜厂闪长岩体 闪长岩 843.7±3.8 宫相宽等，2013 乐素河闪长岩体 闪长岩 842±7 叶霖等，2009 碧口群火山岩 玄武岩 811±12 Wang et al., 2008 碧口群火山岩 玄武岩 821±7 Wang et al., 2008 碧口群火山岩 玄武岩 SHRIMP锆石U-Pb 846±19 Yan et al., 2004 碧口群火山岩 流纹质凝灰岩 790±15 闫全人等，2003 碧口群火山岩 玄武岩 840±10 闫全人等，2003 碧口群火山岩 流纹质凝灰岩 776±13 闫全人等，2003 扬子板块北缘 西乡群 流纹岩 840~820 赵凤清等，2006 西乡群 流纹岩 TIMS 895±3 Ling et al., 2003 西乡群 流纹岩 950±4 Ling et al., 2003 西乡群 闪长岩 SHRIMP锆石U-Pb 764±9 Zhao et al., 2010 西乡群 花岗岩 707 Dong et al., 2012 西乡群 凝灰岩 789±4 邓奇等，2013 西乡群 凝灰岩 760±5 邓奇等，2013 西乡群 英安岩 LA-ICP-MS锆石U-Pb 833±5 夏林圻等，2009 西乡群 玄武岩 730±13 夏林圻等，2009 西乡群 流纹岩 904±18 凌文黎等，2002 望江山岩体 英安岩 946±18 凌文黎等，2002 望江山岩体 辉长闪长岩 784±6 Dong et al., 2011 望江山岩体 苏长辉长岩 LA-ICP-MS锆石U-Pb 825.5±4 夏林圻等，2009 望江山岩体 辉长岩 822±25 李惠民等，2005 望江山岩体 辉长岩 SHRIMP锆石U-Pb 808±14 Zhou et al., 2002 望江山岩体 闪长岩 819±10 Zhou et al., 2002 五堵门杂岩体 英云闪长岩 TIMS 764±2 赵凤清等，2006 五堵门杂岩体 英云闪长岩 LA-ICP-MS锆石U-Pb 789±10 凌文黎等，2006 五堵门杂岩体 花岗岩 716 Dong et al., 2012 五堵门杂岩体 花岗闪长岩 SHRIMP锆石U-Pb 735±8 Zhao and Zhou, 2008 碑坝杂岩体 辉长岩 814±10 Zhao and Zhou, 2009 碑坝杂岩体 花岗闪长岩 863±10 凌文黎等，2006 酉水基性岩体 辉绿岩 LA-ICP-MS锆石U-Pb 795±5 Dong et al., 2011 酉水基性岩体 辉长岩 752±6 Dong et al., 2011 毕矶沟岩体 辉长岩 SHRIMP锆石U-Pb 782±14 Zhou et al., 2002 罗家坝基性岩体 辉长岩 746±4 Zhao and Zhou, 2009 黄官花岗岩体 花岗岩 777 Dong et al., 2012 喜神坝花岗岩体 花岗岩 LA-ICP-MS锆石U-Pb 709 Dong et al., 2012 西家坝基性岩体 辉长岩 799±5 Dong et al., 2011 柳树店辉长岩 辉长岩 898±10 Dong et al., 2011 铁船山组火山岩 流纹岩 TIMS 817±5 Ling et al., 2003 黄家营复式岩体 钾长花岗岩 778±5 赵凤清等，2006 
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