The Eocene-Oligocene climate transition in the Central Paratethys
Abstract We studied two boreholes (Cserépváralja-1 and Kiscell-1) with continuous sedimentary records across the Eocene-Oligocene climate transition from the Central Paratethyan area. Assemblages of benthic foraminifera display a shift in dominance by epifaunal taxa in the late Eocene to shallow and...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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Online Access: | http://real.mtak.hu/47157/ http://real.mtak.hu/47157/1/ozsvrt_2016_P3.pdf https://doi.org/10.1016/j.palaeo.2016.07.034 |
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ftmtak:oai:real.mtak.hu:47157 2023-05-15T13:54:53+02:00 The Eocene-Oligocene climate transition in the Central Paratethys Ozsvárt, Péter Kocsis, László Nyerges, Anita Győri, Orsolya Pálfy, József 2016 text http://real.mtak.hu/47157/ http://real.mtak.hu/47157/1/ozsvrt_2016_P3.pdf https://doi.org/10.1016/j.palaeo.2016.07.034 unknown http://real.mtak.hu/47157/1/ozsvrt_2016_P3.pdf Ozsvárt, Péter and Kocsis, László and Nyerges, Anita and Győri, Orsolya and Pálfy, József (2016) The Eocene-Oligocene climate transition in the Central Paratethys. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, 459. pp. 471-487. ISSN 0031-0182 GB Physical geography / leíró földrajz GC Oceanography / tengerkutatás QE05 Historical geology. Stratigraphy / Földtörténet rétegtan QH540 Ecology / ökológia Article PeerReviewed 2016 ftmtak https://doi.org/10.1016/j.palaeo.2016.07.034 2017-02-01T23:54:54Z Abstract We studied two boreholes (Cserépváralja-1 and Kiscell-1) with continuous sedimentary records across the Eocene-Oligocene climate transition from the Central Paratethyan area. Assemblages of benthic foraminifera display a shift in dominance by epifaunal taxa in the late Eocene to shallow and deep infaunal taxa in the early Oligocene. Using the benthic foraminiferal oxygen index (BFOI), a decreasing trend of bottom-water oxygen levels is established across the Eocene-Oligocene transition (EOT), leading to the development of dysoxic conditions later in the early Oligocene. Trends in δ18O and δ13C values measured on tests of selected benthic and planktic foraminifera roughly parallel those of the global record of stepped EOT δ18O increase and deviate only later in the early Oligocene, related to the isolation of the Paratethys. The overall similarity of the isotope curves and the presence of a planktic-benthic ecological offset suggest that the original isotope trends are preserved, despite the systematically more negative δ18O values. Of different scenarios, a quasi-uniform diagenetic overprint by fluids with low δ18O values, during burial or uplift, appears best supported. We conclude that the globally established isotopic expression of Antarctic ice sheet growth across the EOT may be recognizable in the Paratethys. Deviations from the global trends after the EOT were caused by regional paleoceanographic changes induced by the progressing Alpine orogeny and sea-level change, which led to a restricted connection with the open ocean, freshwater influx from increased precipitation, and gradual development of bottom-water oxygen depletion. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet MTAK: REAL (Library and Information Centre of the Hungarian Academy of Sciences Antarctic Palaeogeography, Palaeoclimatology, Palaeoecology 459 471 487 |
institution |
Open Polar |
collection |
MTAK: REAL (Library and Information Centre of the Hungarian Academy of Sciences |
op_collection_id |
ftmtak |
language |
unknown |
topic |
GB Physical geography / leíró földrajz GC Oceanography / tengerkutatás QE05 Historical geology. Stratigraphy / Földtörténet rétegtan QH540 Ecology / ökológia |
spellingShingle |
GB Physical geography / leíró földrajz GC Oceanography / tengerkutatás QE05 Historical geology. Stratigraphy / Földtörténet rétegtan QH540 Ecology / ökológia Ozsvárt, Péter Kocsis, László Nyerges, Anita Győri, Orsolya Pálfy, József The Eocene-Oligocene climate transition in the Central Paratethys |
topic_facet |
GB Physical geography / leíró földrajz GC Oceanography / tengerkutatás QE05 Historical geology. Stratigraphy / Földtörténet rétegtan QH540 Ecology / ökológia |
description |
Abstract We studied two boreholes (Cserépváralja-1 and Kiscell-1) with continuous sedimentary records across the Eocene-Oligocene climate transition from the Central Paratethyan area. Assemblages of benthic foraminifera display a shift in dominance by epifaunal taxa in the late Eocene to shallow and deep infaunal taxa in the early Oligocene. Using the benthic foraminiferal oxygen index (BFOI), a decreasing trend of bottom-water oxygen levels is established across the Eocene-Oligocene transition (EOT), leading to the development of dysoxic conditions later in the early Oligocene. Trends in δ18O and δ13C values measured on tests of selected benthic and planktic foraminifera roughly parallel those of the global record of stepped EOT δ18O increase and deviate only later in the early Oligocene, related to the isolation of the Paratethys. The overall similarity of the isotope curves and the presence of a planktic-benthic ecological offset suggest that the original isotope trends are preserved, despite the systematically more negative δ18O values. Of different scenarios, a quasi-uniform diagenetic overprint by fluids with low δ18O values, during burial or uplift, appears best supported. We conclude that the globally established isotopic expression of Antarctic ice sheet growth across the EOT may be recognizable in the Paratethys. Deviations from the global trends after the EOT were caused by regional paleoceanographic changes induced by the progressing Alpine orogeny and sea-level change, which led to a restricted connection with the open ocean, freshwater influx from increased precipitation, and gradual development of bottom-water oxygen depletion. |
format |
Article in Journal/Newspaper |
author |
Ozsvárt, Péter Kocsis, László Nyerges, Anita Győri, Orsolya Pálfy, József |
author_facet |
Ozsvárt, Péter Kocsis, László Nyerges, Anita Győri, Orsolya Pálfy, József |
author_sort |
Ozsvárt, Péter |
title |
The Eocene-Oligocene climate transition in the Central Paratethys |
title_short |
The Eocene-Oligocene climate transition in the Central Paratethys |
title_full |
The Eocene-Oligocene climate transition in the Central Paratethys |
title_fullStr |
The Eocene-Oligocene climate transition in the Central Paratethys |
title_full_unstemmed |
The Eocene-Oligocene climate transition in the Central Paratethys |
title_sort |
eocene-oligocene climate transition in the central paratethys |
publishDate |
2016 |
url |
http://real.mtak.hu/47157/ http://real.mtak.hu/47157/1/ozsvrt_2016_P3.pdf https://doi.org/10.1016/j.palaeo.2016.07.034 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_relation |
http://real.mtak.hu/47157/1/ozsvrt_2016_P3.pdf Ozsvárt, Péter and Kocsis, László and Nyerges, Anita and Győri, Orsolya and Pálfy, József (2016) The Eocene-Oligocene climate transition in the Central Paratethys. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, 459. pp. 471-487. ISSN 0031-0182 |
op_doi |
https://doi.org/10.1016/j.palaeo.2016.07.034 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
459 |
container_start_page |
471 |
op_container_end_page |
487 |
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1766261093285494784 |