Planktonic foraminiferal turnover across the Cenomanian – Turonian boundary (OAE2) in the northeast of the Tethys realm, Kopet-Dagh Basin
Abstract Two Late Cenomanian – Early Turonian (C–T) intervals of the eastern part of the Kopet-Dagh basin, NE Iran have been investigated to evaluate the response of planktonic foraminifera to the geological event OAE2. The Gharesu and Taherabad sections with the thicknesses of 30 m and 22.5 m are c...
Published in: | Geologica Carpathica |
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Walter de Gruyter GmbH
2016
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Online Access: | http://dx.doi.org/10.1515/geoca-2016-0028 http://content.sciendo.com/view/journals/geoca/67/5/article-p451.xml https://www.degruyter.com/view/j/geoca.2016.67.issue-5/geoca-2016-0028/geoca-2016-0028.pdf |
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crdegruyter:10.1515/geoca-2016-0028 2023-05-15T18:00:14+02:00 Planktonic foraminiferal turnover across the Cenomanian – Turonian boundary (OAE2) in the northeast of the Tethys realm, Kopet-Dagh Basin Kalanat, Behnaz Vahidinia, Mohammad Vaziri-Moghaddam, Hossein Mahmudy-Gharaie, Mohamad Hossein 2016 http://dx.doi.org/10.1515/geoca-2016-0028 http://content.sciendo.com/view/journals/geoca/67/5/article-p451.xml https://www.degruyter.com/view/j/geoca.2016.67.issue-5/geoca-2016-0028/geoca-2016-0028.pdf unknown Walter de Gruyter GmbH http://creativecommons.org/licenses/by-nc-nd/3.0 CC-BY-NC-ND Geologica Carpathica volume 67, issue 5, page 451-462 ISSN 1336-8052 Geology journal-article 2016 crdegruyter https://doi.org/10.1515/geoca-2016-0028 2022-04-14T05:01:54Z Abstract Two Late Cenomanian – Early Turonian (C–T) intervals of the eastern part of the Kopet-Dagh basin, NE Iran have been investigated to evaluate the response of planktonic foraminifera to the geological event OAE2. The Gharesu and Taherabad sections with the thicknesses of 30 m and 22.5 m are composed of shale and marl interbedded with glauconitic sandstone. Three biozones Rotalipora cushmani , Whiteinella archaeocretacea and Helvetoglobotruncana helvetica were recognized based on study of planktonic foraminifera, in these sections. We observed the patterns of planktonic foraminiferal assemblage changes around the C–T boundary and divided this succession into several successive intervals. This study confirms that OAE2 was a long term event. A gradual perturbation in the study successions starts in the interval 1 with low abundance and diversity of planktonic foraminifera. An enhanced oxygen minimum zone (OMZ) occurs in the interval 3 which coincides with a temporary absence of planktonic foraminifera and sedimentation of framboidal pyrite. High diversity of planktonic foraminifera and appearance of new genera in the interval 5 indicate return of normal conditions to the basin. A significant short-term sea surface temperature cooling is also indicated by planktonic foraminiferal turnover and carbonate contents in the interval 2 which is comparable with other parts of the Tethys Ocean, Boreal sea and Atlantic region. Article in Journal/Newspaper Planktonic foraminifera De Gruyter (via Crossref) Geologica Carpathica 67 5 451 462 |
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Geology |
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Geology Kalanat, Behnaz Vahidinia, Mohammad Vaziri-Moghaddam, Hossein Mahmudy-Gharaie, Mohamad Hossein Planktonic foraminiferal turnover across the Cenomanian – Turonian boundary (OAE2) in the northeast of the Tethys realm, Kopet-Dagh Basin |
topic_facet |
Geology |
description |
Abstract Two Late Cenomanian – Early Turonian (C–T) intervals of the eastern part of the Kopet-Dagh basin, NE Iran have been investigated to evaluate the response of planktonic foraminifera to the geological event OAE2. The Gharesu and Taherabad sections with the thicknesses of 30 m and 22.5 m are composed of shale and marl interbedded with glauconitic sandstone. Three biozones Rotalipora cushmani , Whiteinella archaeocretacea and Helvetoglobotruncana helvetica were recognized based on study of planktonic foraminifera, in these sections. We observed the patterns of planktonic foraminiferal assemblage changes around the C–T boundary and divided this succession into several successive intervals. This study confirms that OAE2 was a long term event. A gradual perturbation in the study successions starts in the interval 1 with low abundance and diversity of planktonic foraminifera. An enhanced oxygen minimum zone (OMZ) occurs in the interval 3 which coincides with a temporary absence of planktonic foraminifera and sedimentation of framboidal pyrite. High diversity of planktonic foraminifera and appearance of new genera in the interval 5 indicate return of normal conditions to the basin. A significant short-term sea surface temperature cooling is also indicated by planktonic foraminiferal turnover and carbonate contents in the interval 2 which is comparable with other parts of the Tethys Ocean, Boreal sea and Atlantic region. |
format |
Article in Journal/Newspaper |
author |
Kalanat, Behnaz Vahidinia, Mohammad Vaziri-Moghaddam, Hossein Mahmudy-Gharaie, Mohamad Hossein |
author_facet |
Kalanat, Behnaz Vahidinia, Mohammad Vaziri-Moghaddam, Hossein Mahmudy-Gharaie, Mohamad Hossein |
author_sort |
Kalanat, Behnaz |
title |
Planktonic foraminiferal turnover across the Cenomanian – Turonian boundary (OAE2) in the northeast of the Tethys realm, Kopet-Dagh Basin |
title_short |
Planktonic foraminiferal turnover across the Cenomanian – Turonian boundary (OAE2) in the northeast of the Tethys realm, Kopet-Dagh Basin |
title_full |
Planktonic foraminiferal turnover across the Cenomanian – Turonian boundary (OAE2) in the northeast of the Tethys realm, Kopet-Dagh Basin |
title_fullStr |
Planktonic foraminiferal turnover across the Cenomanian – Turonian boundary (OAE2) in the northeast of the Tethys realm, Kopet-Dagh Basin |
title_full_unstemmed |
Planktonic foraminiferal turnover across the Cenomanian – Turonian boundary (OAE2) in the northeast of the Tethys realm, Kopet-Dagh Basin |
title_sort |
planktonic foraminiferal turnover across the cenomanian – turonian boundary (oae2) in the northeast of the tethys realm, kopet-dagh basin |
publisher |
Walter de Gruyter GmbH |
publishDate |
2016 |
url |
http://dx.doi.org/10.1515/geoca-2016-0028 http://content.sciendo.com/view/journals/geoca/67/5/article-p451.xml https://www.degruyter.com/view/j/geoca.2016.67.issue-5/geoca-2016-0028/geoca-2016-0028.pdf |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Geologica Carpathica volume 67, issue 5, page 451-462 ISSN 1336-8052 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/3.0 |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1515/geoca-2016-0028 |
container_title |
Geologica Carpathica |
container_volume |
67 |
container_issue |
5 |
container_start_page |
451 |
op_container_end_page |
462 |
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1766169261214007296 |