Carbon isotope stratigraphy, carbonate sedimentology, and microfossil record across the Triassic-Jurassic boundary in the Northern Calcareous Alps-Fonsjoch and Schloßgraben sections, Austria
Carbonate sedimentology, microfossil palaeontology and carbon isotope stratigraphy have been studied at the Triassic-Jurassic boundary in the Northern Calcareous Alps at the Fonsjoch and Schlossgraben sections in Austria. The carbonate microfacies and microfossil results of the Upper Rhaetian at Sch...
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2023
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ftcopenhagenunip:oai:pure.atira.dk:publications/e31509c7-59fe-493c-9e22-1a99ca247992 2024-06-09T07:48:49+00:00 Carbon isotope stratigraphy, carbonate sedimentology, and microfossil record across the Triassic-Jurassic boundary in the Northern Calcareous Alps-Fonsjoch and Schloßgraben sections, Austria Mette, Wolfgang Korte, Christoph Quante, Ella Zierl, Tamara 2023 https://curis.ku.dk/portal/da/publications/carbon-isotope-stratigraphy-carbonate-sedimentology-and-microfossil-record-across-the-triassicjurassic-boundary-in-the-northern-calcareous-alpsfonsjoch-and-schlossgraben-sections-austria(e31509c7-59fe-493c-9e22-1a99ca247992).html https://doi.org/10.1127/nos/2022/0727 eng eng info:eu-repo/semantics/closedAccess Mette , W , Korte , C , Quante , E & Zierl , T 2023 , ' Carbon isotope stratigraphy, carbonate sedimentology, and microfossil record across the Triassic-Jurassic boundary in the Northern Calcareous Alps-Fonsjoch and Schloßgraben sections, Austria ' , Newsletters on Stratigraphy , vol. 56 , no. 2 , pp. 225-255 . https://doi.org/10.1127/nos/2022/0727 Triassic-Jurassic boundary Northern Calcareous Alps Carbon isotopes Oxygen isotopes Carbonate sedimentology Microfossil record PHANEROZOIC BIODIVERSITY CRISES SEA-LEVEL CHANGE MASS EXTINCTION TRIASSIC/JURASSIC BOUNDARY KARWENDEL MOUNTAINS OCEAN ACIDIFICATION ECOLOGICAL RANKING NEW-ZEALAND OXYGEN CYCLE article 2023 ftcopenhagenunip https://doi.org/10.1127/nos/2022/0727 2024-05-16T11:29:26Z Carbonate sedimentology, microfossil palaeontology and carbon isotope stratigraphy have been studied at the Triassic-Jurassic boundary in the Northern Calcareous Alps at the Fonsjoch and Schlossgraben sections in Austria. The carbonate microfacies and microfossil results of the Upper Rhaetian at Schlossgraben are in accordance with previous research indicating a deep subtidal environment within the Eiberg Basin. The so called event bed (T-Bed) is characterised by a successive diversity decrease and disappearance of ostracod taxa which was most probably caused by oxygen deficiency. Lithofacies and micropalaeontologic data from the uppermost Rhaetian at Fonsjoch are indicative of a shallow subtidal environment and existence of a nearby carbonate platform edge. Low diversity ostracod assemblages of juvenile Cytherellidae occurring above the event bed point to a second interval of suboxic conditions in the latest Rhaetian of the Eiberg Basin. For both sections, the late Rhaetian bulk carbonate carbon isotopes of about 1 parts per thousand reflect the near primary signal of the ancient seawater, and the well-known and prominent initial negative delta 13C excursion is present, starting in the limestones of the uppermost Eiberg Member and reaching a minimum within the Schattwald Beds. The delta 13Ccarb values remain low in the Schattwald Beds in both sections and this might be explained by diagenetic alteration, because it contrasts the delta 13Corg trend which returns to heavier values here. However, delta 18O versus delta 13Ccarb cross-plots for the lower beds of the Tiefengraben Member and the Schattwald Beds show only negligible correlation supporting an interpretation that at least the carbonate carbon isotope values represent near primary signals also in this stratigraphic level. Accepting this interpretation, the new results imply that the primary trends of the delta 13Ccarb and delta 13Corg are different, suggesting that the bulk organic matter sources have changed temporarily. These results further indicate ... Article in Journal/Newspaper Ocean acidification University of Copenhagen: Research New Zealand Newsletters on Stratigraphy 56 2 225 255 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
Triassic-Jurassic boundary Northern Calcareous Alps Carbon isotopes Oxygen isotopes Carbonate sedimentology Microfossil record PHANEROZOIC BIODIVERSITY CRISES SEA-LEVEL CHANGE MASS EXTINCTION TRIASSIC/JURASSIC BOUNDARY KARWENDEL MOUNTAINS OCEAN ACIDIFICATION ECOLOGICAL RANKING NEW-ZEALAND OXYGEN CYCLE |
spellingShingle |
Triassic-Jurassic boundary Northern Calcareous Alps Carbon isotopes Oxygen isotopes Carbonate sedimentology Microfossil record PHANEROZOIC BIODIVERSITY CRISES SEA-LEVEL CHANGE MASS EXTINCTION TRIASSIC/JURASSIC BOUNDARY KARWENDEL MOUNTAINS OCEAN ACIDIFICATION ECOLOGICAL RANKING NEW-ZEALAND OXYGEN CYCLE Mette, Wolfgang Korte, Christoph Quante, Ella Zierl, Tamara Carbon isotope stratigraphy, carbonate sedimentology, and microfossil record across the Triassic-Jurassic boundary in the Northern Calcareous Alps-Fonsjoch and Schloßgraben sections, Austria |
topic_facet |
Triassic-Jurassic boundary Northern Calcareous Alps Carbon isotopes Oxygen isotopes Carbonate sedimentology Microfossil record PHANEROZOIC BIODIVERSITY CRISES SEA-LEVEL CHANGE MASS EXTINCTION TRIASSIC/JURASSIC BOUNDARY KARWENDEL MOUNTAINS OCEAN ACIDIFICATION ECOLOGICAL RANKING NEW-ZEALAND OXYGEN CYCLE |
description |
Carbonate sedimentology, microfossil palaeontology and carbon isotope stratigraphy have been studied at the Triassic-Jurassic boundary in the Northern Calcareous Alps at the Fonsjoch and Schlossgraben sections in Austria. The carbonate microfacies and microfossil results of the Upper Rhaetian at Schlossgraben are in accordance with previous research indicating a deep subtidal environment within the Eiberg Basin. The so called event bed (T-Bed) is characterised by a successive diversity decrease and disappearance of ostracod taxa which was most probably caused by oxygen deficiency. Lithofacies and micropalaeontologic data from the uppermost Rhaetian at Fonsjoch are indicative of a shallow subtidal environment and existence of a nearby carbonate platform edge. Low diversity ostracod assemblages of juvenile Cytherellidae occurring above the event bed point to a second interval of suboxic conditions in the latest Rhaetian of the Eiberg Basin. For both sections, the late Rhaetian bulk carbonate carbon isotopes of about 1 parts per thousand reflect the near primary signal of the ancient seawater, and the well-known and prominent initial negative delta 13C excursion is present, starting in the limestones of the uppermost Eiberg Member and reaching a minimum within the Schattwald Beds. The delta 13Ccarb values remain low in the Schattwald Beds in both sections and this might be explained by diagenetic alteration, because it contrasts the delta 13Corg trend which returns to heavier values here. However, delta 18O versus delta 13Ccarb cross-plots for the lower beds of the Tiefengraben Member and the Schattwald Beds show only negligible correlation supporting an interpretation that at least the carbonate carbon isotope values represent near primary signals also in this stratigraphic level. Accepting this interpretation, the new results imply that the primary trends of the delta 13Ccarb and delta 13Corg are different, suggesting that the bulk organic matter sources have changed temporarily. These results further indicate ... |
format |
Article in Journal/Newspaper |
author |
Mette, Wolfgang Korte, Christoph Quante, Ella Zierl, Tamara |
author_facet |
Mette, Wolfgang Korte, Christoph Quante, Ella Zierl, Tamara |
author_sort |
Mette, Wolfgang |
title |
Carbon isotope stratigraphy, carbonate sedimentology, and microfossil record across the Triassic-Jurassic boundary in the Northern Calcareous Alps-Fonsjoch and Schloßgraben sections, Austria |
title_short |
Carbon isotope stratigraphy, carbonate sedimentology, and microfossil record across the Triassic-Jurassic boundary in the Northern Calcareous Alps-Fonsjoch and Schloßgraben sections, Austria |
title_full |
Carbon isotope stratigraphy, carbonate sedimentology, and microfossil record across the Triassic-Jurassic boundary in the Northern Calcareous Alps-Fonsjoch and Schloßgraben sections, Austria |
title_fullStr |
Carbon isotope stratigraphy, carbonate sedimentology, and microfossil record across the Triassic-Jurassic boundary in the Northern Calcareous Alps-Fonsjoch and Schloßgraben sections, Austria |
title_full_unstemmed |
Carbon isotope stratigraphy, carbonate sedimentology, and microfossil record across the Triassic-Jurassic boundary in the Northern Calcareous Alps-Fonsjoch and Schloßgraben sections, Austria |
title_sort |
carbon isotope stratigraphy, carbonate sedimentology, and microfossil record across the triassic-jurassic boundary in the northern calcareous alps-fonsjoch and schloßgraben sections, austria |
publishDate |
2023 |
url |
https://curis.ku.dk/portal/da/publications/carbon-isotope-stratigraphy-carbonate-sedimentology-and-microfossil-record-across-the-triassicjurassic-boundary-in-the-northern-calcareous-alpsfonsjoch-and-schlossgraben-sections-austria(e31509c7-59fe-493c-9e22-1a99ca247992).html https://doi.org/10.1127/nos/2022/0727 |
geographic |
New Zealand |
geographic_facet |
New Zealand |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Mette , W , Korte , C , Quante , E & Zierl , T 2023 , ' Carbon isotope stratigraphy, carbonate sedimentology, and microfossil record across the Triassic-Jurassic boundary in the Northern Calcareous Alps-Fonsjoch and Schloßgraben sections, Austria ' , Newsletters on Stratigraphy , vol. 56 , no. 2 , pp. 225-255 . https://doi.org/10.1127/nos/2022/0727 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1127/nos/2022/0727 |
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