Early Paleogene d13C and d18O records based on marine ostracods: implications for the upper Danian succession at Sidi Nasseur (Tunisia) and their application value in paleoceanography
Ostracode and other microfossil assemblages from the Tunisian Trough have previously been studied to characterize paleoenvironmental conditions during the late Danian interval. Whereas the preservation of foraminifera is generally not sufficient for stable isotope studies, well preserved ostracodes...
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Oesterreichische geologische gesellschaft
2012
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ftunivleuven:oai:lirias.kuleuven.be:123456789/350854 2023-05-15T16:53:02+02:00 Early Paleogene d13C and d18O records based on marine ostracods: implications for the upper Danian succession at Sidi Nasseur (Tunisia) and their application value in paleoceanography Bornemann, André Pirkenseer, Claudius Steurbaut, Etienne Speijer, Robert 2012 1522165 bytes application/pdf https://lirias.kuleuven.be/handle/123456789/350854 https://lirias.kuleuven.be/bitstream/123456789/350854/1//Bonemann_et_al_2012%28Paleogene-ostracod-isotopes_AJESv105_1%29.pdf en eng Oesterreichische geologische gesellschaft C/O GEOLOGICAL SURVEY OF AUSTRIA, RASUMOFSKYGASSE 23, POSTFACH 127, VIENNA, 1031, AUSTRIA Austrian journal of earth sciences vol:105 issue:1 pages:77-87 https://lirias.kuleuven.be/handle/123456789/350854 2072-7151 https://lirias.kuleuven.be/bitstream/123456789/350854/1//Bonemann_et_al_2012%28Paleogene-ostracod-isotopes_AJESv105_1%29.pdf 187906;public marine ostracodes stable isotopes hyperthermals paleogene oxygen-isotope fractionation paleoenvironmental reconstruction danian/selandian boundary calcareous nannofossil thermal maximum water chemistry late paleocene trace-element nile basin carbon Article IT 187906;Article 2012 ftunivleuven 2015-12-22T16:20:06Z Ostracode and other microfossil assemblages from the Tunisian Trough have previously been studied to characterize paleoenvironmental conditions during the late Danian interval. Whereas the preservation of foraminifera is generally not sufficient for stable isotope studies, well preserved ostracodes provide continuous upper Danian stable isotope records (delta C-13, delta O-18) at Sidi Nasseur, W Tunisia. The late Danian is considered to cover a hyperthermal, known as the "Latest Danian Event" (LDE; similar to 61.75 Ma) or "Top C27n Event" and has been unequivocally identified in benthic foraminiferal isotopes from shelf sediments in Egypt and deep-sea material from the Pacific Ocean. Stratigraphic changes in the isotope ratios of the genus Bairdia reveal a rather scattered record for delta C-13 lacking any pronounced negative delta C-13 excursion, probably due to the many factors influencing delta C-13 in ostracodes like metabolism, diet or dissolved inorganic carbon of sea-water. The accompanying delta O-18 record is less ambiguous showing a shift towards lower values close to the level where the LDE is to be expected, but minimum values are similar to delta O-18 values at the base and top of the studied sequence. These data suggest that the core of the negative stable isotope excursions of the LDE is lost in the stratigraphic gap at the planktic foraminiferal P3a/P3b and calcareous nannofossil NTp7A/NTp7B subzonal boundaries, so that the LDE could not be unequivocally identified in Tunisia. A cross-plot of delta C-13 and delta O-18 of ostracode valves displays distinctive clusters for smooth-shelled taxa like Bairdia and others as well as for ornamented taxa, with the latter group showing substantially lower values for both delta C-13 and delta O-18. This pattern strongly resembles those from early Eocene data from southwestern France and Recent ostracodes from the Iceland Plateau. The offsets suggest substantial differences in life style, food source or isotope fractionation during the calcification process for different shell morphologies in ostracodes. status: published Article in Journal/Newspaper Iceland KU Leuven: Lirias Iceland Plateau ENVELOPE(-12.000,-12.000,69.500,69.500) Pacific |
institution |
Open Polar |
collection |
KU Leuven: Lirias |
op_collection_id |
ftunivleuven |
language |
English |
topic |
marine ostracodes stable isotopes hyperthermals paleogene oxygen-isotope fractionation paleoenvironmental reconstruction danian/selandian boundary calcareous nannofossil thermal maximum water chemistry late paleocene trace-element nile basin carbon |
spellingShingle |
marine ostracodes stable isotopes hyperthermals paleogene oxygen-isotope fractionation paleoenvironmental reconstruction danian/selandian boundary calcareous nannofossil thermal maximum water chemistry late paleocene trace-element nile basin carbon Bornemann, André Pirkenseer, Claudius Steurbaut, Etienne Speijer, Robert Early Paleogene d13C and d18O records based on marine ostracods: implications for the upper Danian succession at Sidi Nasseur (Tunisia) and their application value in paleoceanography |
topic_facet |
marine ostracodes stable isotopes hyperthermals paleogene oxygen-isotope fractionation paleoenvironmental reconstruction danian/selandian boundary calcareous nannofossil thermal maximum water chemistry late paleocene trace-element nile basin carbon |
description |
Ostracode and other microfossil assemblages from the Tunisian Trough have previously been studied to characterize paleoenvironmental conditions during the late Danian interval. Whereas the preservation of foraminifera is generally not sufficient for stable isotope studies, well preserved ostracodes provide continuous upper Danian stable isotope records (delta C-13, delta O-18) at Sidi Nasseur, W Tunisia. The late Danian is considered to cover a hyperthermal, known as the "Latest Danian Event" (LDE; similar to 61.75 Ma) or "Top C27n Event" and has been unequivocally identified in benthic foraminiferal isotopes from shelf sediments in Egypt and deep-sea material from the Pacific Ocean. Stratigraphic changes in the isotope ratios of the genus Bairdia reveal a rather scattered record for delta C-13 lacking any pronounced negative delta C-13 excursion, probably due to the many factors influencing delta C-13 in ostracodes like metabolism, diet or dissolved inorganic carbon of sea-water. The accompanying delta O-18 record is less ambiguous showing a shift towards lower values close to the level where the LDE is to be expected, but minimum values are similar to delta O-18 values at the base and top of the studied sequence. These data suggest that the core of the negative stable isotope excursions of the LDE is lost in the stratigraphic gap at the planktic foraminiferal P3a/P3b and calcareous nannofossil NTp7A/NTp7B subzonal boundaries, so that the LDE could not be unequivocally identified in Tunisia. A cross-plot of delta C-13 and delta O-18 of ostracode valves displays distinctive clusters for smooth-shelled taxa like Bairdia and others as well as for ornamented taxa, with the latter group showing substantially lower values for both delta C-13 and delta O-18. This pattern strongly resembles those from early Eocene data from southwestern France and Recent ostracodes from the Iceland Plateau. The offsets suggest substantial differences in life style, food source or isotope fractionation during the calcification process for different shell morphologies in ostracodes. status: published |
format |
Article in Journal/Newspaper |
author |
Bornemann, André Pirkenseer, Claudius Steurbaut, Etienne Speijer, Robert |
author_facet |
Bornemann, André Pirkenseer, Claudius Steurbaut, Etienne Speijer, Robert |
author_sort |
Bornemann, André |
title |
Early Paleogene d13C and d18O records based on marine ostracods: implications for the upper Danian succession at Sidi Nasseur (Tunisia) and their application value in paleoceanography |
title_short |
Early Paleogene d13C and d18O records based on marine ostracods: implications for the upper Danian succession at Sidi Nasseur (Tunisia) and their application value in paleoceanography |
title_full |
Early Paleogene d13C and d18O records based on marine ostracods: implications for the upper Danian succession at Sidi Nasseur (Tunisia) and their application value in paleoceanography |
title_fullStr |
Early Paleogene d13C and d18O records based on marine ostracods: implications for the upper Danian succession at Sidi Nasseur (Tunisia) and their application value in paleoceanography |
title_full_unstemmed |
Early Paleogene d13C and d18O records based on marine ostracods: implications for the upper Danian succession at Sidi Nasseur (Tunisia) and their application value in paleoceanography |
title_sort |
early paleogene d13c and d18o records based on marine ostracods: implications for the upper danian succession at sidi nasseur (tunisia) and their application value in paleoceanography |
publisher |
Oesterreichische geologische gesellschaft |
publishDate |
2012 |
url |
https://lirias.kuleuven.be/handle/123456789/350854 https://lirias.kuleuven.be/bitstream/123456789/350854/1//Bonemann_et_al_2012%28Paleogene-ostracod-isotopes_AJESv105_1%29.pdf |
long_lat |
ENVELOPE(-12.000,-12.000,69.500,69.500) |
geographic |
Iceland Plateau Pacific |
geographic_facet |
Iceland Plateau Pacific |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
Austrian journal of earth sciences vol:105 issue:1 pages:77-87 https://lirias.kuleuven.be/handle/123456789/350854 2072-7151 https://lirias.kuleuven.be/bitstream/123456789/350854/1//Bonemann_et_al_2012%28Paleogene-ostracod-isotopes_AJESv105_1%29.pdf |
op_rights |
187906;public |
_version_ |
1766043560511012864 |