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dc.date.accessioned2014-02-06T12:01:14Z
dc.date.issued2013en_US
dc.date.submitted2013-03-15en_US
dc.identifier.citationMazumder, Al-Amin. Palaeoenvironmental changes of the Triassic-Jurassic boundary in the Restental section, Northern Calcareous Alps (Austria). Masteroppgave, University of Oslo, 2013en_US
dc.identifier.urihttp://hdl.handle.net/10852/36173
dc.description.abstractMany different palynological, sedimentological and mineralogical data were been used in this research in order to reconstruct the paleoenvironmental changes at the Triassic/Jurassic boundary in Restental. Four different terrestrial palynomorph assemblages have been recognized across the TJB. Abundant warm-loving conifer Classopollis in the Koessen Formation imply semi-arid climate. Dinoflagellate cyst Rhaetigonaulax rhaetica indicate normal marine deposition. A distinct lithological change in the boundary between the Koessen and Kendlbach Formation is characterized by an initial CIE that coincide with major disturbances in the marine and terrestrial ecosystem, including the mass occurrence of disaster specie Cymatiosphaera polypartita. Authigenic chlorite, large amount of kaolinite and clay spherules indicate volcanic influence during the time of the events. Base of the Tiefengraben see an increase of the spore to pollen ratio and is accompanied by significant increase of kaolinite. This is most likely the result warmer conditions and increased humidity. Increased humidity resulted in more rainfall and runoff into the Restental area, and creation of a freshwater lens and stratification with an anoxic bottom layer. Large amount of terrestrial AOM is most likely the result of the climate driven depositional changes. Decreased R.Rhaetica and abundant Dapcodinium priscum indicate shallow deposition in a delta front or bay area. The Schattwald beds show the highest amount of kaolinite, which is most likely due to intense weathering of hinterland, in turn caused by the mega-moonsunal climate that prevailed during the peak extinction phase. Coloring of the beds is caused by transportation of hematite bearing red-soils into the basin.. The disappearance of typical Late Triassic pollen Rhaetipollis germanicus and Ovallipollis pseudoalatus at the top of the Schattwald beds coincide with the main CIE and occurs just before the FO of the useful base Jurassic biostratigraphical marker Cerebropollenites thiergartii. A clay mineral shift most likely marks a shift to dry conditions and less terrestrial input is observed above the Schattwald beds, which is reflected by increased carbonate production and return of calcareous nannofossils. An increase of the marine acritarch Leiosphaeridia occurs in the same interval and marks the return to normal marine conditions.nor
dc.description.abstractMany different palynological, sedimentological and mineralogical data were been used in this research in order to reconstruct the paleoenvironmental changes at the Triassic/Jurassic boundary in Restental. Four different terrestrial palynomorph assemblages have been recognized across the TJB. Abundant warm-loving conifer Classopollis in the Koessen Formation imply semi-arid climate. Dinoflagellate cyst Rhaetigonaulax rhaetica indicate normal marine deposition. A distinct lithological change in the boundary between the Koessen and Kendlbach Formation is characterized by an initial CIE that coincide with major disturbances in the marine and terrestrial ecosystem, including the mass occurrence of disaster specie Cymatiosphaera polypartita. Authigenic chlorite, large amount of kaolinite and clay spherules indicate volcanic influence during the time of the events. Base of the Tiefengraben see an increase of the spore to pollen ratio and is accompanied by significant increase of kaolinite. This is most likely the result warmer conditions and increased humidity. Increased humidity resulted in more rainfall and runoff into the Restental area, and creation of a freshwater lens and stratification with an anoxic bottom layer. Large amount of terrestrial AOM is most likely the result of the climate driven depositional changes. Decreased R.Rhaetica and abundant Dapcodinium priscum indicate shallow deposition in a delta front or bay area. The Schattwald beds show the highest amount of kaolinite, which is most likely due to intense weathering of hinterland, in turn caused by the mega-moonsunal climate that prevailed during the peak extinction phase. Coloring of the beds is caused by transportation of hematite bearing red-soils into the basin.. The disappearance of typical Late Triassic pollen Rhaetipollis germanicus and Ovallipollis pseudoalatus at the top of the Schattwald beds coincide with the main CIE and occurs just before the FO of the useful base Jurassic biostratigraphical marker Cerebropollenites thiergartii. A clay mineral shift most likely marks a shift to dry conditions and less terrestrial input is observed above the Schattwald beds, which is reflected by increased carbonate production and return of calcareous nannofossils. An increase of the marine acritarch Leiosphaeridia occurs in the same interval and marks the return to normal marine conditions.eng
dc.language.isonoben_US
dc.titlePalaeoenvironmental changes of the Triassic-Jurassic boundary in the Restental section, Northern Calcareous Alps (Austria) : (Palynology, Sedimentology and Mineralogy)en_US
dc.typeMaster thesisen_US
dc.date.updated2014-02-05en_US
dc.creator.authorMazumder, Al-Aminen_US
dc.date.embargoenddate10000-01-01
dc.rights.termsDette dokumentet er ikke elektronisk tilgjengelig etter ønske fra forfatter. Tilgangskode/Access code Aen_US
dc.rights.termsforeveren_US
dc.subject.nsiVDP::450en_US
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft.au=Mazumder, Al-Amin&rft.title=Palaeoenvironmental changes of the Triassic-Jurassic boundary in the Restental section, Northern Calcareous Alps (Austria)&rft.inst=University of Oslo&rft.date=2013&rft.degree=Masteroppgaveen_US
dc.identifier.urnURN:NBN:no-35941
dc.type.documentMasteroppgaveen_US
dc.identifier.duo177382en_US
dc.contributor.supervisorWolfram Michael Kuerschneren_US
dc.rights.accessrightsclosedaccessen_US
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/36173/2/MASTER_THESIS_MAZUMDER_MARS_15.pdf


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