A Miocene (8–12 Ma) intermediate water benthic stable isotope record from the northeastern Atlantic, ODP Site 982
Oxygen and carbon isotope records are presented for the benthic foraminifer Cibicidoides wuellerstorfi from upper middle through lower upper Miocene (11.6–8.2 Ma) sediments recovered at intermediate water depth (1134 m) at Ocean Drilling Program Site 982 on Rockall Plateau. Oxygen isotopic values ge...
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Language: | English |
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American Geophysical Union
2003
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Online Access: | https://hdl.handle.net/1956/384 https://doi.org/10.1029/2001pa000657 |
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ftunivbergen:oai:bora.uib.no:1956/384 2023-05-15T17:31:17+02:00 A Miocene (8–12 Ma) intermediate water benthic stable isotope record from the northeastern Atlantic, ODP Site 982 Andersson, Carin Jansen, Eystein 2003-03-12 50007 bytes 453787 bytes 183 bytes application/pdf text/plain https://hdl.handle.net/1956/384 https://doi.org/10.1029/2001pa000657 eng eng American Geophysical Union urn:issn:0883-8305 https://hdl.handle.net/1956/384 https://doi.org/10.1029/2001pa000657 cristin:399372 Copyright 2003 the American Geophysical Union 1013 Paleoceanography 18 1 Paleoceanography Stable isotopes North Atlantic Ocean Peer reviewed Journal article 2003 ftunivbergen https://doi.org/10.1029/2001pa000657 2023-03-14T17:40:05Z Oxygen and carbon isotope records are presented for the benthic foraminifer Cibicidoides wuellerstorfi from upper middle through lower upper Miocene (11.6–8.2 Ma) sediments recovered at intermediate water depth (1134 m) at Ocean Drilling Program Site 982 on Rockall Plateau. Oxygen isotopic values generally lighter than those for the Holocene indicate significantly warmer intermediate waters and/or less global ice volume during the late middle to early late Miocene than at the present. The most depleted oxygen isotope values occurred at around 10.5 Ma. After this time a long-term increase in d18O suggests a gradual increase in global ice volume and/or cooling of intermediate waters during the late Miocene. Comparison of the intermediate depth benthic foraminiferal carbon isotope record from Site 982 and records from various North Atlantic deep sites shows that intermediate waters were generally better ventilated than deep waters between 11.6 and 9.6 Ma. During this time period, increased ventilation of intermediate waters was linked to cooling or the build up of polar ice caps. The Mi events originally proposed by Miller et al. [1991b] and Wright and Miller [1992] are difficult to identify with certainty in sediments sampled at high resolution (<104 year). Comparison of the highresolution benthic d18O records from ODP Site 982 with the low-resolution benthic d18O record from Monte Gibliscemi (Mediterranean) show that Mi events, if real, may not be of importance as a stratigraphic tool in upper Miocene sedimentary sequences. publishedVersion Article in Journal/Newspaper North Atlantic University of Bergen: Bergen Open Research Archive (BORA-UiB) Rockall Plateau ENVELOPE(-18.833,-18.833,56.333,56.333) Paleoceanography 18 1 n/a n/a |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
Paleoceanography Stable isotopes North Atlantic Ocean |
spellingShingle |
Paleoceanography Stable isotopes North Atlantic Ocean Andersson, Carin Jansen, Eystein A Miocene (8–12 Ma) intermediate water benthic stable isotope record from the northeastern Atlantic, ODP Site 982 |
topic_facet |
Paleoceanography Stable isotopes North Atlantic Ocean |
description |
Oxygen and carbon isotope records are presented for the benthic foraminifer Cibicidoides wuellerstorfi from upper middle through lower upper Miocene (11.6–8.2 Ma) sediments recovered at intermediate water depth (1134 m) at Ocean Drilling Program Site 982 on Rockall Plateau. Oxygen isotopic values generally lighter than those for the Holocene indicate significantly warmer intermediate waters and/or less global ice volume during the late middle to early late Miocene than at the present. The most depleted oxygen isotope values occurred at around 10.5 Ma. After this time a long-term increase in d18O suggests a gradual increase in global ice volume and/or cooling of intermediate waters during the late Miocene. Comparison of the intermediate depth benthic foraminiferal carbon isotope record from Site 982 and records from various North Atlantic deep sites shows that intermediate waters were generally better ventilated than deep waters between 11.6 and 9.6 Ma. During this time period, increased ventilation of intermediate waters was linked to cooling or the build up of polar ice caps. The Mi events originally proposed by Miller et al. [1991b] and Wright and Miller [1992] are difficult to identify with certainty in sediments sampled at high resolution (<104 year). Comparison of the highresolution benthic d18O records from ODP Site 982 with the low-resolution benthic d18O record from Monte Gibliscemi (Mediterranean) show that Mi events, if real, may not be of importance as a stratigraphic tool in upper Miocene sedimentary sequences. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Andersson, Carin Jansen, Eystein |
author_facet |
Andersson, Carin Jansen, Eystein |
author_sort |
Andersson, Carin |
title |
A Miocene (8–12 Ma) intermediate water benthic stable isotope record from the northeastern Atlantic, ODP Site 982 |
title_short |
A Miocene (8–12 Ma) intermediate water benthic stable isotope record from the northeastern Atlantic, ODP Site 982 |
title_full |
A Miocene (8–12 Ma) intermediate water benthic stable isotope record from the northeastern Atlantic, ODP Site 982 |
title_fullStr |
A Miocene (8–12 Ma) intermediate water benthic stable isotope record from the northeastern Atlantic, ODP Site 982 |
title_full_unstemmed |
A Miocene (8–12 Ma) intermediate water benthic stable isotope record from the northeastern Atlantic, ODP Site 982 |
title_sort |
miocene (8–12 ma) intermediate water benthic stable isotope record from the northeastern atlantic, odp site 982 |
publisher |
American Geophysical Union |
publishDate |
2003 |
url |
https://hdl.handle.net/1956/384 https://doi.org/10.1029/2001pa000657 |
long_lat |
ENVELOPE(-18.833,-18.833,56.333,56.333) |
geographic |
Rockall Plateau |
geographic_facet |
Rockall Plateau |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
1013 Paleoceanography 18 1 |
op_relation |
urn:issn:0883-8305 https://hdl.handle.net/1956/384 https://doi.org/10.1029/2001pa000657 cristin:399372 |
op_rights |
Copyright 2003 the American Geophysical Union |
op_doi |
https://doi.org/10.1029/2001pa000657 |
container_title |
Paleoceanography |
container_volume |
18 |
container_issue |
1 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1766128790044409856 |