鸭绿江盆地鹰嘴砬子组和馒头组的沉积时限及物源:碎屑锆石U-Pb年代学证据
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摘要
鸭绿江盆地中生界鹰嘴砬子组与古生界馒头组河口段碎屑锆石LA-ICP-MS U-Pb的年代学研究结果表明,采自鹰嘴砬子组的凝灰质粉砂岩(样品HD1-3),其碎屑锆石年龄分布区间为3 259~123Ma。主要年龄峰为2 500 Ma(33%)、1 807 Ma(11%)、282 Ma(11%)、235 Ma(5%)、150 Ma(7%)和126 Ma(5%),最年轻的一组锆石加权平均年龄(126 Ma)限定地层的沉积下限为早白垩世,其沉积物源来自于盆地内部及其邻区古元古代、古生代和中生代岩浆作用的产物。采自馒头组河口段的岩屑长石砂岩(样品SD2-1),其碎屑锆石年龄分布区间为2 350~503 Ma。形成的年龄峰值主要为1 553 Ma(13%)、1 396 Ma(13%)、1 086 Ma(17%)和787 Ma(30%)。最小的锆石年龄(503 Ma)限定地层沉积下限为晚寒武世,其沉积物源主要来自鸭绿江盆地内部及其邻区的中元古代和新元古代岩浆作用的产物。
The studies on LA-ICP-MS U-Pb geochronology of detrital zircons from sedimentary rocks within the Yingzuilazi Formation and Hekou member of Mantou Formation in the Yalu River Basin indicate that tuffaceous siltstone(sample HD1-3) collected from the Yingzuilazi Formatioin yielded ages ranging from 3 259 to 123 Ma,which can be subdivided into six age populations with peaks at 2 500(33%),1 807(11%),282(11%),235(5%),150(7%) and 126 Ma(5%).The group of youngest weighted mean age of 126 Ma indicates that the lower limit of the deposition age of Yingzuilazi Formation is Early Cretaceous.Its sedimentary provenances mainly source from the detrital material produced by Paleoproterozoic,Paleozoic and Mesozoic magmatism exposed in the sedimentary basin and adjacent area.Lithic feldspar sandstone(sample SD2-1) collected from the Hekou member of the Mantou Formation yielded ages ranging from 2 350 to 503 Ma,which can be subdivided into four agepopulations with peaks at 1 553(13%),1 396(13%),1 086(17%) and 787 Ma(30%).The youngest zircon age of 503 Ma indicates that the lower limit of the deposition age of Mantou Formation is Late Cambrain.Its sedimentary provenances mainly source from the detrital material produced by Mesoproterozoic and Neoproterozoic magmatism exposed in the sedimentary basin and adjacent area.
The studies on LA-ICP-MS U-Pb geochronology of detrital zircons from sedimentary rocks within the Yingzuilazi Formation and Hekou member of Mantou Formation in the Yalu River Basin indicate that tuffaceous siltstone(sample HD1-3) collected from the Yingzuilazi Formatioin yielded ages ranging from 3 259 to 123 Ma,which can be subdivided into six age populations with peaks at 2 500(33%),1 807(11%),282(11%),235(5%),150(7%) and 126 Ma(5%).The group of youngest weighted mean age of 126 Ma indicates that the lower limit of the deposition age of Yingzuilazi Formation is Early Cretaceous.Its sedimentary provenances mainly source from the detrital material produced by Paleoproterozoic,Paleozoic and Mesozoic magmatism exposed in the sedimentary basin and adjacent area.Lithic feldspar sandstone(sample SD2-1) collected from the Hekou member of the Mantou Formation yielded ages ranging from 2 350 to 503 Ma,which can be subdivided into four agepopulations with peaks at 1 553(13%),1 396(13%),1 086(17%) and 787 Ma(30%).The youngest zircon age of 503 Ma indicates that the lower limit of the deposition age of Mantou Formation is Late Cambrain.Its sedimentary provenances mainly source from the detrital material produced by Mesoproterozoic and Neoproterozoic magmatism exposed in the sedimentary basin and adjacent area.
引文
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[4]杨明慧,刘池洋,曾鹏,等.华北克拉通晚三叠世沉积盆地原型与破坏早期构造变形格局[J].地质评论,2012,58(1):1-18.YANG Ming-hui,LIU Chi-yang,ZENG Peng,et al.Prototypes of Late Triassic sedimentary basins of North China Craton(NCC)and deformation pattern of its early destruction[J].Geological Review,2012,58(1):1-18.
[5]赵越,翟明国,陈虹,等.华北克拉通及相邻造山带古生代—侏罗纪早期大地构造演化[J].中国地质,2017,44(1):44-60.ZHAO Yue,ZHAI Ming-guo,CHEN Hong,et al.Paleozoic-Early Jurassic tectonic evolution of North China Craton and its adjacent orogenic belts[J].Geology in China,2017,44(1):44-60.
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[8]邢树文,李军,马玉波,等.吉林南部地区老岭群变质作用特征研究[J].地球学报,2011,32(3):269-278.XING Shu-wen,LI Jun,MA Yu-bo,et al.A study of metamorphic characteristics of Laoling Group in southern Jilin Province[J].Acta Geoscientica Sinica,2011,32(3):269-278.
[9]刘华.吉林南部马达岭组时代再研究:基于碎屑锆石SHRIMP测年证据[J].世界地质,2014,33(2):266-274.LIU Hua.Restudy on geological age of Madaling Formation in southern Jilin:evidence from detrital zircon SHRIMP U--Pb dating[J].Global Geology,2014,33(2):266-274.
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[13]Liu Y S,Gao S,Hu Z C,et al.Continental and oceanic crust recycling-induced melt peridotite interactions in the Trans--North China Orogen:U-Pb dating,Hf isotopes and trace elements in zircons of mantle xenoliths[J].Journal of Petrology,2010,51:537-571.
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[15]Andersen T.Correction of common lead in U--Pb analyses that do not report204Pb[J].Chemical Geology,2002,192(1/2):59-79.
[16]吉林省地质矿产局.吉林省岩石地层[M].武汉:中国地质大学出版社,1997:238-239.Bureau of Geology and Mineral Resources Jilin of Province.Stratigrphy(lithostratic)of Jilin Province[M].Wuhan:China University of Geosciences Press,1997:238-239.
[17]秦亚.辽吉古元古裂谷带构造演化的年代学制约:博士学位论文[D].长春:吉林大学,2013.QIN Ya.Geochronological constraints on the tectonic evolution of the Liao-Ji Paleoproterozoic rift zone:doctor's degree thesis[D].Changchun:Jilin University,2013.
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[20]许文良,王枫,孟恩,等.黑龙江省东部古生代—早中生代的构造演化:火成岩组合与碎屑锆石UPb年代学证据[J].吉林大学学报(地球科学版),2012,42(5):1378-1389.XU Wen-liang,WANG Feng,MENG En,et al.Paleozoic-Early mesozoic tectonic evolution in the eastern Heilongjiang Province,NE China:evidence from igneous rock association and U--Pb geochronology of detrital zircons[J].Journal of Jilin University(Earth Science Edition)2012,42(5):1378-1389.
[21]陈跃军,路孝平,纪春华,等.吉林东部延边地区海沟—石人沟一带“槽-台”界线露头的发现及地质意义[J].地质评论,2003,49(2):195-200.CHEN Yue-jun,LU Xiao-ping,JI Chun-hua,et al.Discovery of an outcrop of a geosyncline-platform boundary in the Haigou--Shirengou area of Yanbian,Jilin Province and its geological significance[J].Geological Review,2003,49(2):195-200.
[22]裴福萍,叶轶凡,王枫,等.吉林通化地区中元古代辉绿岩墙的发现及其地质意义[J].吉林大学学报(地球科学版),2013,43(1):110-118.PEI Fu-ping,YE Yi-fan,WANG Feng,et al.Discovery of Mesoproterozoic diabase dyke in Tonghua region,Jilin Province and its tectonic implications[J].Journal of Jilin University(Earth Science Edition)2013,43(1):110-118.
[23]ZHAO Guo-chun,CAO Lin,Wilde S A,et al.Implications based on the first SHRIMP U-Pb zircon dating on Precambrian granitoid rocks in North Korea[J].Earth and Planetary Science Letters,2006,251(3/4):365-379.
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