Oxygen and carbon isotopic compositions of foraminifers at DSDP Hole 72-517
Oxygen and carbon isotope analyses were performed on monospecific or mixed-species samples of benthic foraminifers, as well as on the planktonic species Globigerinoides ruber from a 24-m hydraulic piston core raised on the western flank of the Rio Grande Rise, at DSDP Site 517 (30°56.81'S and 3...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.811807 2023-05-15T13:42:11+02:00 Oxygen and carbon isotopic compositions of foraminifers at DSDP Hole 72-517 Vergnaud-Grazzini, Colette Grably, M Pujol, Claude Duprat, Josette M LATITUDE: -30.946800 * LONGITUDE: -38.041200 * DATE/TIME START: 1980-03-30T00:00:00 * DATE/TIME END: 1980-03-30T00:00:00 1983-05-20 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.811807 https://doi.org/10.1594/PANGAEA.811807 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.811807 https://doi.org/10.1594/PANGAEA.811807 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Vergnaud-Grazzini, Colette; Grably, M; Pujol, Claude; Duprat, Josette M (1983): Oxygen isotope stratigraphy and paleoclimatology of southwestern Atlantic Quaternary sediments (Rio Grande Rise) at Deep Sea Drilling Project Site 517. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 871-884, https://doi.org/10.2973/dsdp.proc.72.143.1983 72-517 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg72 South Atlantic/FLANK Dataset 1983 ftpangaea https://doi.org/10.1594/PANGAEA.811807 https://doi.org/10.2973/dsdp.proc.72.143.1983 2023-01-20T07:33:00Z Oxygen and carbon isotope analyses were performed on monospecific or mixed-species samples of benthic foraminifers, as well as on the planktonic species Globigerinoides ruber from a 24-m hydraulic piston core raised on the western flank of the Rio Grande Rise, at DSDP Site 517 (30°56.81'S and 38°02.47'W, water depth 2963 m) in the southwestern Atlantic. This site is presently located in the core of North Atlantic Deep Water (NADW). This is the first long isotopic record of Quaternary benthic foraminifers; it displays at least 30 isotopic stages, 25 of them readily correlated with the standard sequence of Pacific Core V28-239. The depths of both the Bruhnes/Matuyama boundary and the Jaramillo Event based on oxygen isotope stratigraphy agree well with paleomagnetic results. Quaternary faunal data from this part of the Atlantic are dated through isotopic stratigraphy and partially contradict data previously published by Williams and Ledbetter (1979). There was a substantial increase in the size of the earth's major ice sheets culminating at Stage 22 and corresponding to a l per mil progressive increase of d18O maximal values. Further, ice volume-induced isotopic changes were not identical for different glacial cycles. Oxygen and carbon isotope analyses of benthic foraminifers show that during Pleistocene glacial episodes, NADW was cooler than today and that Mediterranean outflow might still have contributed to the NADW sources. The comparison of coiling ratio changes of Globorotalia truncatulinoides with planktonic and benthic oxygen isotope records shows that there might have been southward excursions of the Brazil Current during the Pleistocene, perhaps related to Antarctic surface water surges. The question of the location of NADW sources during glacial maxima remains open. Dataset Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Pacific ENVELOPE(-38.041200,-38.041200,-30.946800,-30.946800) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
72-517 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg72 South Atlantic/FLANK |
spellingShingle |
72-517 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg72 South Atlantic/FLANK Vergnaud-Grazzini, Colette Grably, M Pujol, Claude Duprat, Josette M Oxygen and carbon isotopic compositions of foraminifers at DSDP Hole 72-517 |
topic_facet |
72-517 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg72 South Atlantic/FLANK |
description |
Oxygen and carbon isotope analyses were performed on monospecific or mixed-species samples of benthic foraminifers, as well as on the planktonic species Globigerinoides ruber from a 24-m hydraulic piston core raised on the western flank of the Rio Grande Rise, at DSDP Site 517 (30°56.81'S and 38°02.47'W, water depth 2963 m) in the southwestern Atlantic. This site is presently located in the core of North Atlantic Deep Water (NADW). This is the first long isotopic record of Quaternary benthic foraminifers; it displays at least 30 isotopic stages, 25 of them readily correlated with the standard sequence of Pacific Core V28-239. The depths of both the Bruhnes/Matuyama boundary and the Jaramillo Event based on oxygen isotope stratigraphy agree well with paleomagnetic results. Quaternary faunal data from this part of the Atlantic are dated through isotopic stratigraphy and partially contradict data previously published by Williams and Ledbetter (1979). There was a substantial increase in the size of the earth's major ice sheets culminating at Stage 22 and corresponding to a l per mil progressive increase of d18O maximal values. Further, ice volume-induced isotopic changes were not identical for different glacial cycles. Oxygen and carbon isotope analyses of benthic foraminifers show that during Pleistocene glacial episodes, NADW was cooler than today and that Mediterranean outflow might still have contributed to the NADW sources. The comparison of coiling ratio changes of Globorotalia truncatulinoides with planktonic and benthic oxygen isotope records shows that there might have been southward excursions of the Brazil Current during the Pleistocene, perhaps related to Antarctic surface water surges. The question of the location of NADW sources during glacial maxima remains open. |
format |
Dataset |
author |
Vergnaud-Grazzini, Colette Grably, M Pujol, Claude Duprat, Josette M |
author_facet |
Vergnaud-Grazzini, Colette Grably, M Pujol, Claude Duprat, Josette M |
author_sort |
Vergnaud-Grazzini, Colette |
title |
Oxygen and carbon isotopic compositions of foraminifers at DSDP Hole 72-517 |
title_short |
Oxygen and carbon isotopic compositions of foraminifers at DSDP Hole 72-517 |
title_full |
Oxygen and carbon isotopic compositions of foraminifers at DSDP Hole 72-517 |
title_fullStr |
Oxygen and carbon isotopic compositions of foraminifers at DSDP Hole 72-517 |
title_full_unstemmed |
Oxygen and carbon isotopic compositions of foraminifers at DSDP Hole 72-517 |
title_sort |
oxygen and carbon isotopic compositions of foraminifers at dsdp hole 72-517 |
publisher |
PANGAEA |
publishDate |
1983 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.811807 https://doi.org/10.1594/PANGAEA.811807 |
op_coverage |
LATITUDE: -30.946800 * LONGITUDE: -38.041200 * DATE/TIME START: 1980-03-30T00:00:00 * DATE/TIME END: 1980-03-30T00:00:00 |
long_lat |
ENVELOPE(-38.041200,-38.041200,-30.946800,-30.946800) |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
op_source |
Supplement to: Vergnaud-Grazzini, Colette; Grably, M; Pujol, Claude; Duprat, Josette M (1983): Oxygen isotope stratigraphy and paleoclimatology of southwestern Atlantic Quaternary sediments (Rio Grande Rise) at Deep Sea Drilling Project Site 517. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 871-884, https://doi.org/10.2973/dsdp.proc.72.143.1983 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.811807 https://doi.org/10.1594/PANGAEA.811807 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.811807 https://doi.org/10.2973/dsdp.proc.72.143.1983 |
_version_ |
1766164476339421184 |