Santonian-Campanian planktonic foraminifera from Tanzania, Shatsky Rise and Exmouth Plateau : species depth ecology and paleoceanographic inferences
The Santonian-Campanian interval is of particular interest as it encompasses a cooling trend after the Late Cretaceous greenhouse maximum warmth of the Turonian as well as a possibly related major faunal turnover among planktonic foraminifera. The recovery of pristinely preserved planktonic foramini...
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Online Access: | http://hdl.handle.net/2434/250932 https://doi.org/10.1016/j.marmicro.2013.07.003 |
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ftunivmilanoair:oai:air.unimi.it:2434/250932 2024-02-11T10:08:02+01:00 Santonian-Campanian planktonic foraminifera from Tanzania, Shatsky Rise and Exmouth Plateau : species depth ecology and paleoceanographic inferences F. Falzoni M.R. Petrizzo K. G. MacLeod B. T. Huber F. Falzoni M.R. Petrizzo K.G. Macleod B.T. Huber 2013-09 http://hdl.handle.net/2434/250932 https://doi.org/10.1016/j.marmicro.2013.07.003 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000325195100002 volume:103 firstpage:15 lastpage:29 numberofpages:15 journal:MARINE MICROPALEONTOLOGY http://hdl.handle.net/2434/250932 doi:10.1016/j.marmicro.2013.07.003 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84882783488 info:eu-repo/semantics/closedAccess Ecological interval Late cretaceou Paleo-habitat Paleoceanography Planktonic foraminifera Stable isotope Oceanography Paleontology Settore GEO/01 - Paleontologia e Paleoecologia info:eu-repo/semantics/article 2013 ftunivmilanoair https://doi.org/10.1016/j.marmicro.2013.07.003 2024-01-23T23:29:40Z The Santonian-Campanian interval is of particular interest as it encompasses a cooling trend after the Late Cretaceous greenhouse maximum warmth of the Turonian as well as a possibly related major faunal turnover among planktonic foraminifera. The recovery of pristinely preserved planktonic foraminifera from Santonian-Campanian sequences in southeastern Tanzania allows examination of faunal changes and documentation of species-specific stable isotope (δ13C and δ18O) signatures. These isotopic data are ideal for inferring species paleoecological preferences and for tracing major paleoceanographic changes. This study reports the first δ18O and δ13C data generated on "glassy" specimens of Marginotruncana coronata, M. undulata, M. marginata, and M. pseudolinneiana and Sigalia carpatica. Additional results from Shatsky Rise (Ocean Drilling Program Leg 198, Hole 1210B) and Exmouth Plateau (ODP Leg 122, Hole 762C) provide geographic control on species habitat preferences and paleoceanographic context. Isotopic analyses suggest that double-keeled species, including Globotruncana bulloides, Contusotruncana fornicata, C. plummerae and probably marginotruncanids, inhabited the surface mixed layer, whereas the biserial Gublerina rajagopalani was a permanent thermocline dweller. Thus, our study confirms recent suggestions that the depth-distribution models based on shell morphology and analogies with modern taxa are not applicable. At all the examined localities, changes in planktonic foraminiferal assemblages are used to define several ecological intervals, each one characterized by a distinctive taxonomic composition and/or increasing/decreasing species diversity. Combined geochemical and paleontological observations suggest that, by the middle-late Campanian, a stratified upper water column developed in Tanzania while less stratified and/or mesotrophic conditions prevailed at Shatsky Rise and Exmouth Plateau. Article in Journal/Newspaper Planktonic foraminifera The University of Milan: Archivio Istituzionale della Ricerca (AIR) Marine Micropaleontology 103 15 29 |
institution |
Open Polar |
collection |
The University of Milan: Archivio Istituzionale della Ricerca (AIR) |
op_collection_id |
ftunivmilanoair |
language |
English |
topic |
Ecological interval Late cretaceou Paleo-habitat Paleoceanography Planktonic foraminifera Stable isotope Oceanography Paleontology Settore GEO/01 - Paleontologia e Paleoecologia |
spellingShingle |
Ecological interval Late cretaceou Paleo-habitat Paleoceanography Planktonic foraminifera Stable isotope Oceanography Paleontology Settore GEO/01 - Paleontologia e Paleoecologia F. Falzoni M.R. Petrizzo K. G. MacLeod B. T. Huber Santonian-Campanian planktonic foraminifera from Tanzania, Shatsky Rise and Exmouth Plateau : species depth ecology and paleoceanographic inferences |
topic_facet |
Ecological interval Late cretaceou Paleo-habitat Paleoceanography Planktonic foraminifera Stable isotope Oceanography Paleontology Settore GEO/01 - Paleontologia e Paleoecologia |
description |
The Santonian-Campanian interval is of particular interest as it encompasses a cooling trend after the Late Cretaceous greenhouse maximum warmth of the Turonian as well as a possibly related major faunal turnover among planktonic foraminifera. The recovery of pristinely preserved planktonic foraminifera from Santonian-Campanian sequences in southeastern Tanzania allows examination of faunal changes and documentation of species-specific stable isotope (δ13C and δ18O) signatures. These isotopic data are ideal for inferring species paleoecological preferences and for tracing major paleoceanographic changes. This study reports the first δ18O and δ13C data generated on "glassy" specimens of Marginotruncana coronata, M. undulata, M. marginata, and M. pseudolinneiana and Sigalia carpatica. Additional results from Shatsky Rise (Ocean Drilling Program Leg 198, Hole 1210B) and Exmouth Plateau (ODP Leg 122, Hole 762C) provide geographic control on species habitat preferences and paleoceanographic context. Isotopic analyses suggest that double-keeled species, including Globotruncana bulloides, Contusotruncana fornicata, C. plummerae and probably marginotruncanids, inhabited the surface mixed layer, whereas the biserial Gublerina rajagopalani was a permanent thermocline dweller. Thus, our study confirms recent suggestions that the depth-distribution models based on shell morphology and analogies with modern taxa are not applicable. At all the examined localities, changes in planktonic foraminiferal assemblages are used to define several ecological intervals, each one characterized by a distinctive taxonomic composition and/or increasing/decreasing species diversity. Combined geochemical and paleontological observations suggest that, by the middle-late Campanian, a stratified upper water column developed in Tanzania while less stratified and/or mesotrophic conditions prevailed at Shatsky Rise and Exmouth Plateau. |
author2 |
F. Falzoni M.R. Petrizzo K.G. Macleod B.T. Huber |
format |
Article in Journal/Newspaper |
author |
F. Falzoni M.R. Petrizzo K. G. MacLeod B. T. Huber |
author_facet |
F. Falzoni M.R. Petrizzo K. G. MacLeod B. T. Huber |
author_sort |
F. Falzoni |
title |
Santonian-Campanian planktonic foraminifera from Tanzania, Shatsky Rise and Exmouth Plateau : species depth ecology and paleoceanographic inferences |
title_short |
Santonian-Campanian planktonic foraminifera from Tanzania, Shatsky Rise and Exmouth Plateau : species depth ecology and paleoceanographic inferences |
title_full |
Santonian-Campanian planktonic foraminifera from Tanzania, Shatsky Rise and Exmouth Plateau : species depth ecology and paleoceanographic inferences |
title_fullStr |
Santonian-Campanian planktonic foraminifera from Tanzania, Shatsky Rise and Exmouth Plateau : species depth ecology and paleoceanographic inferences |
title_full_unstemmed |
Santonian-Campanian planktonic foraminifera from Tanzania, Shatsky Rise and Exmouth Plateau : species depth ecology and paleoceanographic inferences |
title_sort |
santonian-campanian planktonic foraminifera from tanzania, shatsky rise and exmouth plateau : species depth ecology and paleoceanographic inferences |
publishDate |
2013 |
url |
http://hdl.handle.net/2434/250932 https://doi.org/10.1016/j.marmicro.2013.07.003 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000325195100002 volume:103 firstpage:15 lastpage:29 numberofpages:15 journal:MARINE MICROPALEONTOLOGY http://hdl.handle.net/2434/250932 doi:10.1016/j.marmicro.2013.07.003 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84882783488 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.marmicro.2013.07.003 |
container_title |
Marine Micropaleontology |
container_volume |
103 |
container_start_page |
15 |
op_container_end_page |
29 |
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1790606935827939328 |