Planktonic foraminiferal biostratigraphy and stable carbon isotope ratios of late middle Eocene sediments from Blake Plateau, West Atlantic Ocean
The muricate planktonic foraminiferal genera Morozovella and Acarinina were abundant and diverse during the upper Palaeocene to middle Eocene and dominated the tropical and subtropical assemblages. A significant biotic turnover in planktonic foraminifera occurred in the latest middle Eocene with a n...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.678249 2024-05-19T07:44:50+00:00 Planktonic foraminiferal biostratigraphy and stable carbon isotope ratios of late middle Eocene sediments from Blake Plateau, West Atlantic Ocean Wade, Bridget S LATITUDE: 29.951333 * LONGITUDE: -76.626778 * DATE/TIME START: 1997-01-30T00:00:00 * DATE/TIME END: 1997-01-30T00:00:00 2004 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.678249 https://doi.org/10.1594/PANGAEA.678249 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.678249 https://doi.org/10.1594/PANGAEA.678249 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Wade, Bridget S (2004): Planktonic foraminiferal biostratigraphy and mechanisms in the extinction of Morozovella in the late middle Eocene. Marine Micropaleontology, 51(1-2), 23-38, https://doi.org/10.1016/j.marmicro.2003.09.001 171-1052 Blake Nose North Atlantic Ocean COMPCORE Composite Core Joides Resolution Leg171B Ocean Drilling Program ODP Dataset 2004 ftpangaea https://doi.org/10.1594/PANGAEA.67824910.1016/j.marmicro.2003.09.001 2024-04-30T23:34:34Z The muricate planktonic foraminiferal genera Morozovella and Acarinina were abundant and diverse during the upper Palaeocene to middle Eocene and dominated the tropical and subtropical assemblages. A significant biotic turnover in planktonic foraminifera occurred in the latest middle Eocene with a notable reduction in the acarininid lineage and the extinction of the morozovellids. These genera are extensively employed as palaeoclimatic and biostratigraphic markers and, therefore, this turnover episode is an important event in the record of the Cenozoic planktonic foraminifera. Sediments from the western North Atlantic (Ocean Drilling Program Site 1052) were examined in order to investigate these extinction events, in terms of both timing and mechanisms. Biostratigraphic events of the middle and late Eocene have been examined with a sampling resoluti on of approximately 3 kyr. These have been calibrated to the magneto- and astrochronology to accurately define the timing of key biostratigraphic events, particularly the extinction of Morozovella spinulosa which is a distinct biomarker for late middle Eocene sediments. High-resolution biostratigraphy reveals that the extinctions in the muricate group occurred in a stepwise form. The large acarininids (Acarinina praetopilensis) terminate 10 kyr prior to the extinction of M. spinulosa and small acarininids (Acarinina medizzai and Acarinina echinata) continue into the upper Eocene. High-resolution stable isotope analyses have been conducted on planktonic and benthic foraminifera from the western North Atlantic to reconstruct sea surface temperatures (SSTs) and deep water temperatures and the structure of the water column around this major biotic turnover. Whilst the extinctions of M. spinulosa and A. praetopilensis occur during a long-term cooling trend, the biotic turnover in the muricate group does not appear to be related to significant climatic change. Sea surface temperatures decrease slowly prior to the extinction events, and there is no evidence for a ... Dataset North Atlantic Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-76.626778,-76.626778,29.951333,29.951333) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
171-1052 Blake Nose North Atlantic Ocean COMPCORE Composite Core Joides Resolution Leg171B Ocean Drilling Program ODP |
spellingShingle |
171-1052 Blake Nose North Atlantic Ocean COMPCORE Composite Core Joides Resolution Leg171B Ocean Drilling Program ODP Wade, Bridget S Planktonic foraminiferal biostratigraphy and stable carbon isotope ratios of late middle Eocene sediments from Blake Plateau, West Atlantic Ocean |
topic_facet |
171-1052 Blake Nose North Atlantic Ocean COMPCORE Composite Core Joides Resolution Leg171B Ocean Drilling Program ODP |
description |
The muricate planktonic foraminiferal genera Morozovella and Acarinina were abundant and diverse during the upper Palaeocene to middle Eocene and dominated the tropical and subtropical assemblages. A significant biotic turnover in planktonic foraminifera occurred in the latest middle Eocene with a notable reduction in the acarininid lineage and the extinction of the morozovellids. These genera are extensively employed as palaeoclimatic and biostratigraphic markers and, therefore, this turnover episode is an important event in the record of the Cenozoic planktonic foraminifera. Sediments from the western North Atlantic (Ocean Drilling Program Site 1052) were examined in order to investigate these extinction events, in terms of both timing and mechanisms. Biostratigraphic events of the middle and late Eocene have been examined with a sampling resoluti on of approximately 3 kyr. These have been calibrated to the magneto- and astrochronology to accurately define the timing of key biostratigraphic events, particularly the extinction of Morozovella spinulosa which is a distinct biomarker for late middle Eocene sediments. High-resolution biostratigraphy reveals that the extinctions in the muricate group occurred in a stepwise form. The large acarininids (Acarinina praetopilensis) terminate 10 kyr prior to the extinction of M. spinulosa and small acarininids (Acarinina medizzai and Acarinina echinata) continue into the upper Eocene. High-resolution stable isotope analyses have been conducted on planktonic and benthic foraminifera from the western North Atlantic to reconstruct sea surface temperatures (SSTs) and deep water temperatures and the structure of the water column around this major biotic turnover. Whilst the extinctions of M. spinulosa and A. praetopilensis occur during a long-term cooling trend, the biotic turnover in the muricate group does not appear to be related to significant climatic change. Sea surface temperatures decrease slowly prior to the extinction events, and there is no evidence for a ... |
format |
Dataset |
author |
Wade, Bridget S |
author_facet |
Wade, Bridget S |
author_sort |
Wade, Bridget S |
title |
Planktonic foraminiferal biostratigraphy and stable carbon isotope ratios of late middle Eocene sediments from Blake Plateau, West Atlantic Ocean |
title_short |
Planktonic foraminiferal biostratigraphy and stable carbon isotope ratios of late middle Eocene sediments from Blake Plateau, West Atlantic Ocean |
title_full |
Planktonic foraminiferal biostratigraphy and stable carbon isotope ratios of late middle Eocene sediments from Blake Plateau, West Atlantic Ocean |
title_fullStr |
Planktonic foraminiferal biostratigraphy and stable carbon isotope ratios of late middle Eocene sediments from Blake Plateau, West Atlantic Ocean |
title_full_unstemmed |
Planktonic foraminiferal biostratigraphy and stable carbon isotope ratios of late middle Eocene sediments from Blake Plateau, West Atlantic Ocean |
title_sort |
planktonic foraminiferal biostratigraphy and stable carbon isotope ratios of late middle eocene sediments from blake plateau, west atlantic ocean |
publisher |
PANGAEA |
publishDate |
2004 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.678249 https://doi.org/10.1594/PANGAEA.678249 |
op_coverage |
LATITUDE: 29.951333 * LONGITUDE: -76.626778 * DATE/TIME START: 1997-01-30T00:00:00 * DATE/TIME END: 1997-01-30T00:00:00 |
long_lat |
ENVELOPE(-76.626778,-76.626778,29.951333,29.951333) |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_source |
Supplement to: Wade, Bridget S (2004): Planktonic foraminiferal biostratigraphy and mechanisms in the extinction of Morozovella in the late middle Eocene. Marine Micropaleontology, 51(1-2), 23-38, https://doi.org/10.1016/j.marmicro.2003.09.001 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.678249 https://doi.org/10.1594/PANGAEA.678249 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.67824910.1016/j.marmicro.2003.09.001 |
_version_ |
1799484719284355072 |