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Volume 19 Issue 1
Feb.  2008
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Evolution of Carbon Isotope Composition in Potential Global Stratotype Section and Point at Luoyixi, South China, for the Base of the Unnamed Global Seventh Stage of Cambrian System

  • Received Date: 2018-07-15
  • Rev Recd Date: 2018-07-15
  • Publish Date: 2018-07-15
  • ThisworkdealswiththeevolutionofcarbonisotopecompositionintheLuoyixi(罗依溪)Section,acandidateoftheGlobalStandardStratotype-sectionandPoint(GSSP),definingthebaseoftheas-yet-undefinedseventhstageofCambrianSystematthefirstappearanceofthecosmopolitanagnostoidLejopygelaevigata.ThislevelisfavoredinavoteofInternationalSubcommissiononCambrianStratigraphy(ISCS)asthebiohorizonfordefiningthebaseofaglobalstage.Twohundredandsixty-foursamplesforcarbonandoxygenisotopeanalysishavebeencollectedfromthecarbonatesuccessionsatanintervalof0.25to0.5minthissection.Resultsofthecarbonisotopedataexhibitaremarkabledisciplinariantrend.ThepatternofthecarbonisotopeevolutionisgentlyundulantwitharelativelylongperiodduringtheunderlyingDrumianStage,andthenthevaluesofδ13Cfluctuatesharplywithashortperiodinprovisionalseventhstage.Theonsetofsharpfluctuationintheδ13CvaluesbeginsattheproposedGSSPlevel,definingthebaseoftheglobalseventhstage,whereδ13Cvalueschangefromagentletrendtoasharptrend.Distinctcovariant-relationshipsamongδ13C,δ18O,andsealevelfluctuationssuggestthatawarmingchangeinpaleoclimatetookplaceduringtheearlyglobalseventhstage,whichledtoapositiveshiftinδ13Cvalues.
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通讯作者: 陈斌, bchen63@163.com
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Evolution of Carbon Isotope Composition in Potential Global Stratotype Section and Point at Luoyixi, South China, for the Base of the Unnamed Global Seventh Stage of Cambrian System

Abstract: ThisworkdealswiththeevolutionofcarbonisotopecompositionintheLuoyixi(罗依溪)Section,acandidateoftheGlobalStandardStratotype-sectionandPoint(GSSP),definingthebaseoftheas-yet-undefinedseventhstageofCambrianSystematthefirstappearanceofthecosmopolitanagnostoidLejopygelaevigata.ThislevelisfavoredinavoteofInternationalSubcommissiononCambrianStratigraphy(ISCS)asthebiohorizonfordefiningthebaseofaglobalstage.Twohundredandsixty-foursamplesforcarbonandoxygenisotopeanalysishavebeencollectedfromthecarbonatesuccessionsatanintervalof0.25to0.5minthissection.Resultsofthecarbonisotopedataexhibitaremarkabledisciplinariantrend.ThepatternofthecarbonisotopeevolutionisgentlyundulantwitharelativelylongperiodduringtheunderlyingDrumianStage,andthenthevaluesofδ13Cfluctuatesharplywithashortperiodinprovisionalseventhstage.Theonsetofsharpfluctuationintheδ13CvaluesbeginsattheproposedGSSPlevel,definingthebaseoftheglobalseventhstage,whereδ13Cvalueschangefromagentletrendtoasharptrend.Distinctcovariant-relationshipsamongδ13C,δ18O,andsealevelfluctuationssuggestthatawarmingchangeinpaleoclimatetookplaceduringtheearlyglobalseventhstage,whichledtoapositiveshiftinδ13Cvalues.

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