Environmental changes during the Paleocene—Eocene Thermal Maximum in Spitsbergen as reflected by benthic foraminifera
The study deals with environmental changes during the Paleocene-Eocene Thermal Maximum (PETM) and its background conditions in Spitsbergen through analysis of benthic foraminiferal assemblages (FA) in a section drilled in the Paleogene Central Basin. The impact of this extreme global warming occurs...
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Norwegian Polar Institute
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ftjpolarres:oai:journals.openacademia.net:article/3103 2024-09-09T20:04:27+00:00 Environmental changes during the Paleocene—Eocene Thermal Maximum in Spitsbergen as reflected by benthic foraminifera Nagy, Jenö Jargvoll, David Dypvik, Henning Jochmann, Malte Riber, Lars 2013-07-25 application/pdf text/html application/epub+zip text/plain application/vnd.openxmlformats-officedocument.wordprocessingml.document https://polarresearch.net/index.php/polar/article/view/3103 https://doi.org/10.3402/polar.v32i0.19737 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/3103/pdf_1 https://polarresearch.net/index.php/polar/article/view/3103/html https://polarresearch.net/index.php/polar/article/view/3103/7121 https://polarresearch.net/index.php/polar/article/view/3103/7122 https://polarresearch.net/index.php/polar/article/view/3103/7123 https://polarresearch.net/index.php/polar/article/view/3103 doi:10.3402/polar.v32i0.19737 Polar Research; Vol 32 (2013) 1751-8369 PETM foraminifera faunal turnover diversity decrease sequence stratigraphy info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2013 ftjpolarres https://doi.org/10.3402/polar.v32i0.19737 2024-06-20T23:33:17Z The study deals with environmental changes during the Paleocene-Eocene Thermal Maximum (PETM) and its background conditions in Spitsbergen through analysis of benthic foraminiferal assemblages (FA) in a section drilled in the Paleogene Central Basin. The impact of this extreme global warming occurs here in prodelta shelf mudstones composing the lower part of the Gilsonryggen Member (Frysjaodden Formation). The start of the PETM perturbation is marked by a faunal turnover, in which the medium-diversity circumpolar Reticulophragmium assemblage was replaced by a low-diversity Trochammina fauna. During the hyperthermal period, benthic foraminiferal diversity decreased severely, while the dominance of small-sized taxa with epifaunal morphology strongly increased. This low-diversity fauna occurs in sediments with a reduced thorium/uranium ratio (proxy for oxygenation) and kaolinite enrichment (proxy for high humidity). The faunal changes were thus caused by the combined effects of hypoxic and hyposaline conditions in a stratified water column, due to extreme warming with its accompanying intensified hydrologic cycle. The PETM acme coincides with the maximum flooding surface (MFS) of the Gilsonryggen depositional sequence, composed of the Gilsonryggen Member and the overlying Battfjellet and Aspelintoppen formations. The transgressive phase of the sequence was initiated by local tectonics, while the eustatic sea-level rise of the PETM was superimposed on this transgression.Keywords: PETM; foraminifera; faunal turnover; diversity decrease; sequence stratigraphy(Published: 25 July 2013)To access the supplementary material for this article, please see Supplementary files in the column to the right (under Article Tools)Citation: Polar Research 2013, 32, 19737, http://dx.doi.org/10.3402/polar.v32i0.19737 Article in Journal/Newspaper Polar Research Spitsbergen Polar Research Battfjellet ENVELOPE(16.192,16.192,78.063,78.063) Frysjaodden ENVELOPE(15.396,15.396,77.737,77.737) Aspelintoppen ENVELOPE(16.750,16.750,77.767,77.767) Gilsonryggen ENVELOPE(16.200,16.200,78.100,78.100) Polar Research 32 1 19737 |
institution |
Open Polar |
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Polar Research |
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ftjpolarres |
language |
English |
topic |
PETM foraminifera faunal turnover diversity decrease sequence stratigraphy |
spellingShingle |
PETM foraminifera faunal turnover diversity decrease sequence stratigraphy Nagy, Jenö Jargvoll, David Dypvik, Henning Jochmann, Malte Riber, Lars Environmental changes during the Paleocene—Eocene Thermal Maximum in Spitsbergen as reflected by benthic foraminifera |
topic_facet |
PETM foraminifera faunal turnover diversity decrease sequence stratigraphy |
description |
The study deals with environmental changes during the Paleocene-Eocene Thermal Maximum (PETM) and its background conditions in Spitsbergen through analysis of benthic foraminiferal assemblages (FA) in a section drilled in the Paleogene Central Basin. The impact of this extreme global warming occurs here in prodelta shelf mudstones composing the lower part of the Gilsonryggen Member (Frysjaodden Formation). The start of the PETM perturbation is marked by a faunal turnover, in which the medium-diversity circumpolar Reticulophragmium assemblage was replaced by a low-diversity Trochammina fauna. During the hyperthermal period, benthic foraminiferal diversity decreased severely, while the dominance of small-sized taxa with epifaunal morphology strongly increased. This low-diversity fauna occurs in sediments with a reduced thorium/uranium ratio (proxy for oxygenation) and kaolinite enrichment (proxy for high humidity). The faunal changes were thus caused by the combined effects of hypoxic and hyposaline conditions in a stratified water column, due to extreme warming with its accompanying intensified hydrologic cycle. The PETM acme coincides with the maximum flooding surface (MFS) of the Gilsonryggen depositional sequence, composed of the Gilsonryggen Member and the overlying Battfjellet and Aspelintoppen formations. The transgressive phase of the sequence was initiated by local tectonics, while the eustatic sea-level rise of the PETM was superimposed on this transgression.Keywords: PETM; foraminifera; faunal turnover; diversity decrease; sequence stratigraphy(Published: 25 July 2013)To access the supplementary material for this article, please see Supplementary files in the column to the right (under Article Tools)Citation: Polar Research 2013, 32, 19737, http://dx.doi.org/10.3402/polar.v32i0.19737 |
format |
Article in Journal/Newspaper |
author |
Nagy, Jenö Jargvoll, David Dypvik, Henning Jochmann, Malte Riber, Lars |
author_facet |
Nagy, Jenö Jargvoll, David Dypvik, Henning Jochmann, Malte Riber, Lars |
author_sort |
Nagy, Jenö |
title |
Environmental changes during the Paleocene—Eocene Thermal Maximum in Spitsbergen as reflected by benthic foraminifera |
title_short |
Environmental changes during the Paleocene—Eocene Thermal Maximum in Spitsbergen as reflected by benthic foraminifera |
title_full |
Environmental changes during the Paleocene—Eocene Thermal Maximum in Spitsbergen as reflected by benthic foraminifera |
title_fullStr |
Environmental changes during the Paleocene—Eocene Thermal Maximum in Spitsbergen as reflected by benthic foraminifera |
title_full_unstemmed |
Environmental changes during the Paleocene—Eocene Thermal Maximum in Spitsbergen as reflected by benthic foraminifera |
title_sort |
environmental changes during the paleocene—eocene thermal maximum in spitsbergen as reflected by benthic foraminifera |
publisher |
Norwegian Polar Institute |
publishDate |
2013 |
url |
https://polarresearch.net/index.php/polar/article/view/3103 https://doi.org/10.3402/polar.v32i0.19737 |
long_lat |
ENVELOPE(16.192,16.192,78.063,78.063) ENVELOPE(15.396,15.396,77.737,77.737) ENVELOPE(16.750,16.750,77.767,77.767) ENVELOPE(16.200,16.200,78.100,78.100) |
geographic |
Battfjellet Frysjaodden Aspelintoppen Gilsonryggen |
geographic_facet |
Battfjellet Frysjaodden Aspelintoppen Gilsonryggen |
genre |
Polar Research Spitsbergen |
genre_facet |
Polar Research Spitsbergen |
op_source |
Polar Research; Vol 32 (2013) 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/3103/pdf_1 https://polarresearch.net/index.php/polar/article/view/3103/html https://polarresearch.net/index.php/polar/article/view/3103/7121 https://polarresearch.net/index.php/polar/article/view/3103/7122 https://polarresearch.net/index.php/polar/article/view/3103/7123 https://polarresearch.net/index.php/polar/article/view/3103 doi:10.3402/polar.v32i0.19737 |
op_doi |
https://doi.org/10.3402/polar.v32i0.19737 |
container_title |
Polar Research |
container_volume |
32 |
container_issue |
1 |
container_start_page |
19737 |
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1809936637073817600 |