Planktonic foraminiferal biostratigraphy and quantitative analysis during the Campanian-Maastrichtian transition at the Oued Necham section (Kalâat Senan, central Tunisia)
The Oued Necham (ON) section (Kalâat Senan, central Tunisia) provides a well-exposed outcrop of a Campanian-Maastrichtian series that consists essentially of chalky limestones (i.e. the Abiod Formation) grading progressively to a marly unit (i.e. the El Haria Formation). The transitional Abiod-El Ha...
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ftdergipark2ojs:oai:dergipark.org.tr:article/390072 2023-05-15T18:01:12+02:00 Planktonic foraminiferal biostratigraphy and quantitative analysis during the Campanian-Maastrichtian transition at the Oued Necham section (Kalâat Senan, central Tunisia) SAÏDI, Ezzedine ZAGHBIB-TURKI, Dalila 2016-12-01T00:00:00Z application/pdf https://dergipark.org.tr/tr/pub/tbtkearth/issue/35155/390072 unknown TÜBİTAK TUBITAK https://dergipark.org.tr/tr/download/article-file/418988 https://dergipark.org.tr/tr/pub/tbtkearth/issue/35155/390072 Volume: 25, Issue: 6 538-572 1300-0985 1303-619X Turkish Journal of Earth Sciences Campanian/Maastrichtian boundary,planktonic foraminifera,high-resolution biostratigraphy,bioevents,central Tunisia,Rugoglobigerina scotti Subzone,Planoglobulina acervulinoides Subzone info:eu-repo/semantics/article 2016 ftdergipark2ojs 2020-08-27T17:44:47Z The Oued Necham (ON) section (Kalâat Senan, central Tunisia) provides a well-exposed outcrop of a Campanian-Maastrichtian series that consists essentially of chalky limestones (i.e. the Abiod Formation) grading progressively to a marly unit (i.e. the El Haria Formation). The transitional Abiod-El Haria succession comprises a rich hemipelagic-pelagic fauna in the study area, but ammonites (e.g., Pachydiscus neubergicus, the Campanian/Maastrichtian (C/M) boundary index taxon) are scarce to absent, thus preventing the recognition of the standard zones defined for the Tethyan realm. However, the rich planktonic foraminiferal taxa of the El Haria Formation allow us to establish an accurate biostratigraphical scheme. Accordingly, this work presents a high-resolution planktonic foraminiferal biostratigraphy that is characterised by distinct bioevents associated with the reported C/M boundary (i.e. lowest occurrences (LOs) of Rugoglobigerina scotti and Contusotruncana contusa) at the Global Stratotype Section and Point (GSSP) of the Tercis-les-Bains section, south-western France. Based on these zonal markers, the rugoglobigerinids and multiserial heterohelicids are used to define a subzonal scheme spanning the standard Gansserina gansseri Zone, including the Rugoglobigerina rotundata Subzone indicative of the late Campanian and the Rugoglobigerina scotti Subzone and the Planoglobulina acervulinoides Subzone, respectively, indicative of the early Maastrichtian. The abundance of foraminiferal assemblages allowed us to carry out high-resolution quantitative analyses that document a significant climate cooling during the early Maastrichtian intermittent with short-term warming episodes. Thus, opportunist taxa (r strategists, mostly heterohelicids) thrived during the earliest Maastrichtian cooling event, whereas specialist taxa (k strategists, mostly double-keeled) that had dominated the late Campanian assemblages declined gradually without any extinction. Opportunist and specialist taxa fluctuated in opposite phases throughout the early Maastrichtian (LO of Rugoglobigerina scotti ? LO of Abathomphalus mayaroensis), suggesting essentially variations in water temperature. Since surface dwellers dominated the assemblages, they imply continuous sea surface optimal conditions of nutrient supply and water connectivity induced from upwelling currents. Article in Journal/Newspaper Planktonic foraminifera DergiPark Akademik (E-Journals) |
institution |
Open Polar |
collection |
DergiPark Akademik (E-Journals) |
op_collection_id |
ftdergipark2ojs |
language |
unknown |
topic |
Campanian/Maastrichtian boundary,planktonic foraminifera,high-resolution biostratigraphy,bioevents,central Tunisia,Rugoglobigerina scotti Subzone,Planoglobulina acervulinoides Subzone |
spellingShingle |
Campanian/Maastrichtian boundary,planktonic foraminifera,high-resolution biostratigraphy,bioevents,central Tunisia,Rugoglobigerina scotti Subzone,Planoglobulina acervulinoides Subzone SAÏDI, Ezzedine ZAGHBIB-TURKI, Dalila Planktonic foraminiferal biostratigraphy and quantitative analysis during the Campanian-Maastrichtian transition at the Oued Necham section (Kalâat Senan, central Tunisia) |
topic_facet |
Campanian/Maastrichtian boundary,planktonic foraminifera,high-resolution biostratigraphy,bioevents,central Tunisia,Rugoglobigerina scotti Subzone,Planoglobulina acervulinoides Subzone |
description |
The Oued Necham (ON) section (Kalâat Senan, central Tunisia) provides a well-exposed outcrop of a Campanian-Maastrichtian series that consists essentially of chalky limestones (i.e. the Abiod Formation) grading progressively to a marly unit (i.e. the El Haria Formation). The transitional Abiod-El Haria succession comprises a rich hemipelagic-pelagic fauna in the study area, but ammonites (e.g., Pachydiscus neubergicus, the Campanian/Maastrichtian (C/M) boundary index taxon) are scarce to absent, thus preventing the recognition of the standard zones defined for the Tethyan realm. However, the rich planktonic foraminiferal taxa of the El Haria Formation allow us to establish an accurate biostratigraphical scheme. Accordingly, this work presents a high-resolution planktonic foraminiferal biostratigraphy that is characterised by distinct bioevents associated with the reported C/M boundary (i.e. lowest occurrences (LOs) of Rugoglobigerina scotti and Contusotruncana contusa) at the Global Stratotype Section and Point (GSSP) of the Tercis-les-Bains section, south-western France. Based on these zonal markers, the rugoglobigerinids and multiserial heterohelicids are used to define a subzonal scheme spanning the standard Gansserina gansseri Zone, including the Rugoglobigerina rotundata Subzone indicative of the late Campanian and the Rugoglobigerina scotti Subzone and the Planoglobulina acervulinoides Subzone, respectively, indicative of the early Maastrichtian. The abundance of foraminiferal assemblages allowed us to carry out high-resolution quantitative analyses that document a significant climate cooling during the early Maastrichtian intermittent with short-term warming episodes. Thus, opportunist taxa (r strategists, mostly heterohelicids) thrived during the earliest Maastrichtian cooling event, whereas specialist taxa (k strategists, mostly double-keeled) that had dominated the late Campanian assemblages declined gradually without any extinction. Opportunist and specialist taxa fluctuated in opposite phases throughout the early Maastrichtian (LO of Rugoglobigerina scotti ? LO of Abathomphalus mayaroensis), suggesting essentially variations in water temperature. Since surface dwellers dominated the assemblages, they imply continuous sea surface optimal conditions of nutrient supply and water connectivity induced from upwelling currents. |
format |
Article in Journal/Newspaper |
author |
SAÏDI, Ezzedine ZAGHBIB-TURKI, Dalila |
author_facet |
SAÏDI, Ezzedine ZAGHBIB-TURKI, Dalila |
author_sort |
SAÏDI, Ezzedine |
title |
Planktonic foraminiferal biostratigraphy and quantitative analysis during the Campanian-Maastrichtian transition at the Oued Necham section (Kalâat Senan, central Tunisia) |
title_short |
Planktonic foraminiferal biostratigraphy and quantitative analysis during the Campanian-Maastrichtian transition at the Oued Necham section (Kalâat Senan, central Tunisia) |
title_full |
Planktonic foraminiferal biostratigraphy and quantitative analysis during the Campanian-Maastrichtian transition at the Oued Necham section (Kalâat Senan, central Tunisia) |
title_fullStr |
Planktonic foraminiferal biostratigraphy and quantitative analysis during the Campanian-Maastrichtian transition at the Oued Necham section (Kalâat Senan, central Tunisia) |
title_full_unstemmed |
Planktonic foraminiferal biostratigraphy and quantitative analysis during the Campanian-Maastrichtian transition at the Oued Necham section (Kalâat Senan, central Tunisia) |
title_sort |
planktonic foraminiferal biostratigraphy and quantitative analysis during the campanian-maastrichtian transition at the oued necham section (kalâat senan, central tunisia) |
publisher |
TÜBİTAK |
publishDate |
2016 |
url |
https://dergipark.org.tr/tr/pub/tbtkearth/issue/35155/390072 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Volume: 25, Issue: 6 538-572 1300-0985 1303-619X Turkish Journal of Earth Sciences |
op_relation |
https://dergipark.org.tr/tr/download/article-file/418988 https://dergipark.org.tr/tr/pub/tbtkearth/issue/35155/390072 |
_version_ |
1766170576943054848 |