贵州南部地区安尼阶底界锆石SHRIMP年龄结果
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摘要
中国西南地区中下三叠统广泛发育多层凝灰岩,贵州望谟甘河桥剖面安尼阶底界,即中/下三叠统界线位于火山凝灰岩之下0.5m处为国际上奥伦尼克阶/安尼阶(Olenekian-Anisian)界线层型牙形石划分标志Chiosella timorensis首现的位置。从火山凝灰岩分离出20颗岩浆成因锆石的SHRIMP年龄测定,获得206Pb/238U加权平均年龄为247.6±1.7Ma(95% conf.)或±1.4(2σ)Ma,此结果与贵州关刀剖面Olenekian-Anisian界线附近凝灰岩用TIMS方法得出的247.2±0.1 Ma年龄有很好的一致性。望谟甘河桥剖面中下三叠统界线凝灰岩在华南地区大面积分布,本文的结果为区域地层对比和划分提供了新的年龄数据,同时为研究三叠纪初期生物复苏时限提供了新的年龄参考。
New zircon U-Pb age is obtained for late Early and Middle Triassic tuff layer from the Ganheqiao section, Wangmo country, Guizhou province. The first appearance of conodont Chiosella timorensis was discovered just 0.5 m below the tuff, which is used to define the Olenekian-Anisian boundary of the Lower/Middle Triassic. Twenty zircons defined a weighted mean 206Pb/238U age of 247.6± 1.4 Ma (2σ). The new dates is in better agreement with a 247.2 Ma age obtained from the Guandao section of Guizhou Province, which was identified using TIMS method and was proposed for the boundary age of Olenekian-Anisian. The tuff layer found in the Ganheqiao section is wide distributed in southwest China. Our result defines a new dating for the regional stratigraphic correlation, and also provides a reliable dating for the duration of biological recovery in the Early Triassic after the extinction of Permo-Triassic.
New zircon U-Pb age is obtained for late Early and Middle Triassic tuff layer from the Ganheqiao section, Wangmo country, Guizhou province. The first appearance of conodont Chiosella timorensis was discovered just 0.5 m below the tuff, which is used to define the Olenekian-Anisian boundary of the Lower/Middle Triassic. Twenty zircons defined a weighted mean 206Pb/238U age of 247.6± 1.4 Ma (2σ). The new dates is in better agreement with a 247.2 Ma age obtained from the Guandao section of Guizhou Province, which was identified using TIMS method and was proposed for the boundary age of Olenekian-Anisian. The tuff layer found in the Ganheqiao section is wide distributed in southwest China. Our result defines a new dating for the regional stratigraphic correlation, and also provides a reliable dating for the duration of biological recovery in the Early Triassic after the extinction of Permo-Triassic.
引文
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胡世玲,李曰俊,戴墥谟,蒲志平.1996.贵州绿豆岩激光质谱40Ar-39Ar年龄.岩石学报,12(3):409~415.
黄思静,裴昌蓉,卿海若,胡作维,吴素娟,孙治雷.2006.四川盆地东部海相下—中三叠统界线的锶同位素年龄标定.地质学报,80(11):1691~1698.
宋彪,张玉海,万渝生.2002.锆石SHRI MP样品靶制作、年龄测定及有关现象讨论.地质论评,48(增刊):26~30.
童金南,殷鸿福.1997.下扬子区海相三叠系层序地层研究.中国科学(D辑),27(5):407~411.
王彦斌,刘敦一,姚建新,纪战胜,王立亭,武桂春.2004.黔西南下—中三叠统界线年龄.地质学报,78(5):587~590.
姚建新,纪战胜,王立亭,王彦斌,武桂春.2004.贵州南部地区中三叠纪青岩阶底界附近牙形石生物地层学研究.地质学报,78(5):577~585.
殷鸿福,杨遵仪,童金南.2000.国际三叠系研究现状.地层学杂志,24(2):109~113.
殷鸿福,童金南.2002.关于中国的海相三叠系建阶及下三叠统分阶界线.地球科学,27(5):490~497.
Bottjer D J.2001.Biotic Recovery from Mass Extinctions.PalaeobiologyⅡ.Oxford:Blackwell Science,202~206.
Erwin D H,Bowring S A,Jin Yugan.2002.End-Permian massextinction:a review.In:Kocber C,ed.Special Paper356:Catastrophic Events and Mass Extinctions:I mpacts andBeyond.Geological Society of America Spcial Paper,363~383.
Erwin D H.2005.Extinction:Howlife on Earth nearly died250millon years ago.Princeton,NewJersey:Princeton UniversityPress,306.
Flgel E.2002.Triassic reef patterns.SEPM Special Publication,72:391~463.
Gradstein F M,Ogg J G,Smith A G.2004.A Geological Ti meScale.Cambridge University Press,Cambridge,271~306.
Lehrmann DJ,Payne J L,Felix S V,Dillett P M,Wang Hongmei,Yu Youyi,Wei Jiayong.2003.Permian-Triassic boundarysections from shallow-marine carbonate platforms of theNanpanjiang Basin,South China:i mplications for oceanicconditions associated with the end-Permian extinction and itsaftermath.Palaios,18:138~152.
Lehrmann D J,Ramezani J,Bowring S A,Martin M W,Montgomery P,Enos P,Payne J L,Orchard M J,WangHongmei,Wei Jiayong.2006.Ti ming of recovery from theend-Permian extinction:geochronologic and biostratigraphic constraints fromsouth China.Geology,34(12):1053~1056.
Ludwig K R.1999.U sermanual for Isoplot/Ex,version2.10,ageochronological tookit for Microsoft Excel BakeleyGeochronological Center Special Publication No.1a.
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Martin M W,Bowring S A,Enos S A,Ramezani P,Wei J,ZhangJ.2001.Ti ming of Lower Triassic carbonate bank buildup andbiotic recovery following the end-Permian extinction across theNanpangjiang Basin,South China.Abstracts with Programs—Geological Society of America,33:201.
Mundil R,Ludwig K R,Metcalfe I,Renne P R.2004.Age andti ming of the end-Permian mass extinction:U/Pbgeochronology on closed systemzircons.Science,305:1760~1763.
Ogg J G,Ogg G,Gradstein F M.2008.The Concise Geologic Ti meScale.Cambridge:Cambridge University Press,85~93.
Orchard MJ.1995.Taxonomy and correlation of Lower Triassic(Spathian)segminate conodonts from Oman and revision ofsome species ofNeospathodus.Journal of Paleontology,69:110~122.
Orchard MJ,Tozer E T.1997.Triassic conodont biochronology,its calibration with the ammonoid standard,and abiostratigraphic summary for the western Canada sedi mentarybasin.Bulletin of Canadian Petroleum Geology,45:675~692.
Ovtcharova M,Bucher H,Schaltegger U,Galfetti T,Brayard A,Guex J.2006.New Early to Middle Triassic U-Pb ages fromsouth China:calibration with ammonoid biochronozones andi mplications for the ti ming of Triassic biotic recovery.Earth and Planetary Science Letters,243:463~475,doi:10.1016/j.epsl.2006.01.042.
Payne J L,Lehrmann DJ,Wei Jiayong,Orchard MP,Schrag D P,Knoll A H.2004.Large perturbations of the carbon cycleduring recovery fromthe end-Permian extinction.Science,23:506~509.
Payne J L,Lehrmann D J,Wei Jiayong,Knoll A H.2006.Recovery from the end-Permian extinction in south China.Palaios,21:63~85.
Schubert J K,Bottjer DJ.1995.Aftermath of the Permian-Triassicextinction event:paleoecology of Lower Triassic carbonates inthe western USA.Palaeogeograpy,Palaeocli matology,Palaeoecology,116:1~39.
Tong Jiannan,Zhang Suxin,Zuo Jingxun,Xiong Xinqi.2007.Events during Early Tiassic recovery from the end-Permianextinction.Global and Planetary Change,55:66~80.
Williams I S,Claesson S.1987.Isotopic evidence for thePrecambrian provenance and Caledonian metamorphism of highgrade paragneisses from the Seve Nappes,ScandinavianCaledonides:Ⅱ.Ion microprobe zircon U-Th-Pb.Contributions to Mineralogy and Petrology,97:205~217.
Williams I S.1998.U-Th-Pb geochronology byion microprobe.In:McKibben M A,et al.,eds.Applications of MicroanalyticalTechniques to Understanding Mineraling Processes Reviews inEconomy in Geology,7:1~35.
Woods A D,Bottjer D J,Mutti M,Morrison J.1999.LowerTriassic large sea-floor carbonate cements:their origin and amechanism for the prolonged biotic recovery from the end-Permian mass extinction.Geology,27:645~648.
贵州省地质矿产局.1987.贵州省地质志.北京:地质出版社,277~321.
胡世玲,李曰俊,戴墥谟,蒲志平.1996.贵州绿豆岩激光质谱40Ar-39Ar年龄.岩石学报,12(3):409~415.
黄思静,裴昌蓉,卿海若,胡作维,吴素娟,孙治雷.2006.四川盆地东部海相下—中三叠统界线的锶同位素年龄标定.地质学报,80(11):1691~1698.
宋彪,张玉海,万渝生.2002.锆石SHRI MP样品靶制作、年龄测定及有关现象讨论.地质论评,48(增刊):26~30.
童金南,殷鸿福.1997.下扬子区海相三叠系层序地层研究.中国科学(D辑),27(5):407~411.
王彦斌,刘敦一,姚建新,纪战胜,王立亭,武桂春.2004.黔西南下—中三叠统界线年龄.地质学报,78(5):587~590.
姚建新,纪战胜,王立亭,王彦斌,武桂春.2004.贵州南部地区中三叠纪青岩阶底界附近牙形石生物地层学研究.地质学报,78(5):577~585.
殷鸿福,杨遵仪,童金南.2000.国际三叠系研究现状.地层学杂志,24(2):109~113.
殷鸿福,童金南.2002.关于中国的海相三叠系建阶及下三叠统分阶界线.地球科学,27(5):490~497.
Bottjer D J.2001.Biotic Recovery from Mass Extinctions.PalaeobiologyⅡ.Oxford:Blackwell Science,202~206.
Erwin D H,Bowring S A,Jin Yugan.2002.End-Permian massextinction:a review.In:Kocber C,ed.Special Paper356:Catastrophic Events and Mass Extinctions:I mpacts andBeyond.Geological Society of America Spcial Paper,363~383.
Erwin D H.2005.Extinction:Howlife on Earth nearly died250millon years ago.Princeton,NewJersey:Princeton UniversityPress,306.
Flgel E.2002.Triassic reef patterns.SEPM Special Publication,72:391~463.
Gradstein F M,Ogg J G,Smith A G.2004.A Geological Ti meScale.Cambridge University Press,Cambridge,271~306.
Lehrmann DJ,Payne J L,Felix S V,Dillett P M,Wang Hongmei,Yu Youyi,Wei Jiayong.2003.Permian-Triassic boundarysections from shallow-marine carbonate platforms of theNanpanjiang Basin,South China:i mplications for oceanicconditions associated with the end-Permian extinction and itsaftermath.Palaios,18:138~152.
Lehrmann D J,Ramezani J,Bowring S A,Martin M W,Montgomery P,Enos P,Payne J L,Orchard M J,WangHongmei,Wei Jiayong.2006.Ti ming of recovery from theend-Permian extinction:geochronologic and biostratigraphic constraints fromsouth China.Geology,34(12):1053~1056.
Ludwig K R.1999.U sermanual for Isoplot/Ex,version2.10,ageochronological tookit for Microsoft Excel BakeleyGeochronological Center Special Publication No.1a.
Ludwig K.R.2002.SQUID1.03.A user’s manual BakeleyGeochronological Center Special Publication No.2.
Martin M W,Bowring S A,Enos S A,Ramezani P,Wei J,ZhangJ.2001.Ti ming of Lower Triassic carbonate bank buildup andbiotic recovery following the end-Permian extinction across theNanpangjiang Basin,South China.Abstracts with Programs—Geological Society of America,33:201.
Mundil R,Ludwig K R,Metcalfe I,Renne P R.2004.Age andti ming of the end-Permian mass extinction:U/Pbgeochronology on closed systemzircons.Science,305:1760~1763.
Ogg J G,Ogg G,Gradstein F M.2008.The Concise Geologic Ti meScale.Cambridge:Cambridge University Press,85~93.
Orchard MJ.1995.Taxonomy and correlation of Lower Triassic(Spathian)segminate conodonts from Oman and revision ofsome species ofNeospathodus.Journal of Paleontology,69:110~122.
Orchard MJ,Tozer E T.1997.Triassic conodont biochronology,its calibration with the ammonoid standard,and abiostratigraphic summary for the western Canada sedi mentarybasin.Bulletin of Canadian Petroleum Geology,45:675~692.
Ovtcharova M,Bucher H,Schaltegger U,Galfetti T,Brayard A,Guex J.2006.New Early to Middle Triassic U-Pb ages fromsouth China:calibration with ammonoid biochronozones andi mplications for the ti ming of Triassic biotic recovery.Earth and Planetary Science Letters,243:463~475,doi:10.1016/j.epsl.2006.01.042.
Payne J L,Lehrmann DJ,Wei Jiayong,Orchard MP,Schrag D P,Knoll A H.2004.Large perturbations of the carbon cycleduring recovery fromthe end-Permian extinction.Science,23:506~509.
Payne J L,Lehrmann D J,Wei Jiayong,Knoll A H.2006.Recovery from the end-Permian extinction in south China.Palaios,21:63~85.
Schubert J K,Bottjer DJ.1995.Aftermath of the Permian-Triassicextinction event:paleoecology of Lower Triassic carbonates inthe western USA.Palaeogeograpy,Palaeocli matology,Palaeoecology,116:1~39.
Tong Jiannan,Zhang Suxin,Zuo Jingxun,Xiong Xinqi.2007.Events during Early Tiassic recovery from the end-Permianextinction.Global and Planetary Change,55:66~80.
Williams I S,Claesson S.1987.Isotopic evidence for thePrecambrian provenance and Caledonian metamorphism of highgrade paragneisses from the Seve Nappes,ScandinavianCaledonides:Ⅱ.Ion microprobe zircon U-Th-Pb.Contributions to Mineralogy and Petrology,97:205~217.
Williams I S.1998.U-Th-Pb geochronology byion microprobe.In:McKibben M A,et al.,eds.Applications of MicroanalyticalTechniques to Understanding Mineraling Processes Reviews inEconomy in Geology,7:1~35.
Woods A D,Bottjer D J,Mutti M,Morrison J.1999.LowerTriassic large sea-floor carbonate cements:their origin and amechanism for the prolonged biotic recovery from the end-Permian mass extinction.Geology,27:645~648.
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