Bulletin of geosciences | |
Petrophysical and geochemical signature of the Hangenberg Events: an integrated stratigraphy of the Devonian-Carboniferous boundary interval in the Northern Rhenish Massif (Avalonia, Germany) | |
Frýda J1  Kalvoda J1  Becker RT1  Kumpan T1  Hartenfels S1  Bábek O1  Matys Grygar T1  | |
关键词: Famennian; Tournaisian; Hangenberg Events; gamma-ray spectrometry; magnetic susceptibility; element geochemistry; stable carbon isotope geochemistry; | |
DOI : | |
来源: Czech Geological Survey | |
【 摘 要 】
Petrophysical(gamma-rayspectrometry,magneticsusceptibility)andgeochemical(X-rayfluorescencespectrometryandinorganiccarbonisotopegeochemistry)methodsareusedforstratigraphiccorrelationsandpalaeoenvironmentalinterpretationsoftheDevonian-CarboniferousboundaryintervalinthenorthernpartoftheRheinischesSchiefergebirge,Germany.SectionsatOese,OberrodinghausenandDrewerwerestudiedinthestratigraphicrangefromtheFamennianUpperexpansaZonetotheTournaisianLowercrenulataZone.TheFamennianWocklumLimestonerevealsdistinctivecyclicityinthelimestoneandshalearrangement,whoseprimaryoriginhasbeensupportedbycorrelationwithK/Alratiochanges.Lower-orderK/Alcyclicityfollowsbundlesofalternatinglayers.Ontheotherhand,Zr/AlcyclicityisratherindependentonfaciesandK/AlanddurationofZr/Alcycleswasestimatedtobe370ka,whichiscloseto405kaeccentricity.CorrelationsofthecurvepatternsofComputedGammaRay,U/ThGRS,bulkmagneticsusceptibility,K/Al,Zr/Al,S,andMnproxieshavebeenemployedforregionalcorrelation.OurdatasetconfirmspreviouspalaeoenvironmentalinterpretationsoftheHangenbergEventsandadditionallyprovidesinformationongradualdecreaseinabottomoxygenationjustpriortheevents.Peaksinredoxandpalaeoproductivityproxies(U/Th,Cu+Ni+Zn+Pb)occurintheHangenbergBlackShaleinallstudiedsections.AlthoughsedimentationoftheHangenbergBlackShaletookplaceduringthedeepeningstep,theenhancedpalaeoproductivityandhypoxiatoanoxiawerethemaincauseofitsdeposition.AninterregionalcorrelationoftheDevonian-CarboniferousintervalsfromthenorthernRhenishMassif,MoravianKarstandCarnicAlpswascarriedoutandunderlinesthepotentialforfurtherchronostratigraphicdefinitions.
【 授权许可】
Unknown
【 预 览 】
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RO201912090783240ZK.pdf | 6585KB | download |