Oxygen and carbon isotopic composition in Eocene and Oligocene planktonic and benthic foraminifera from DSDP sediments
Oxygen and carbon isotope ratios in Eocene and Oligocene planktonic and benthic foraminifera have been investigated from Atlantic, Indian, and Pacific Ocean locations. The major changes in Eocene-Oligocene benthic foraminiferal oxygen isotopes were enrichment of up to 1 per mil in 18O associated wit...
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Format: | Other/Unknown Material |
Language: | English |
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PANGAEA
1986
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.719183 https://doi.org/10.1594/PANGAEA.719183 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.719183 |
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openpolar |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
10-94 12-116 17-167 2-10 22-214 22-217 23-219 26-253 29-277 31-292 3-19 39-357 40-362 40-363 41-366 48-401 80-548 90-592 90-593 95-612 9-77B Antarctic Ocean/PLATEAU Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Gulf of Mexico/SCARP Indian Ocean//RIDGE Indian Ocean/Arabian Sea/RIDGE Leg10 Leg12 Leg17 Leg2 Leg22 Leg23 Leg26 Leg29 Leg3 Leg31 Leg39 Leg40 Leg41 Leg48 Leg80 Leg9 Leg90 Leg95 North Atlantic/BASIN North Atlantic/CONT RISE |
spellingShingle |
10-94 12-116 17-167 2-10 22-214 22-217 23-219 26-253 29-277 31-292 3-19 39-357 40-362 40-363 41-366 48-401 80-548 90-592 90-593 95-612 9-77B Antarctic Ocean/PLATEAU Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Gulf of Mexico/SCARP Indian Ocean//RIDGE Indian Ocean/Arabian Sea/RIDGE Leg10 Leg12 Leg17 Leg2 Leg22 Leg23 Leg26 Leg29 Leg3 Leg31 Leg39 Leg40 Leg41 Leg48 Leg80 Leg9 Leg90 Leg95 North Atlantic/BASIN North Atlantic/CONT RISE Keigwin, Lloyd D Corliss, Bruce H Oxygen and carbon isotopic composition in Eocene and Oligocene planktonic and benthic foraminifera from DSDP sediments |
topic_facet |
10-94 12-116 17-167 2-10 22-214 22-217 23-219 26-253 29-277 31-292 3-19 39-357 40-362 40-363 41-366 48-401 80-548 90-592 90-593 95-612 9-77B Antarctic Ocean/PLATEAU Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Gulf of Mexico/SCARP Indian Ocean//RIDGE Indian Ocean/Arabian Sea/RIDGE Leg10 Leg12 Leg17 Leg2 Leg22 Leg23 Leg26 Leg29 Leg3 Leg31 Leg39 Leg40 Leg41 Leg48 Leg80 Leg9 Leg90 Leg95 North Atlantic/BASIN North Atlantic/CONT RISE |
description |
Oxygen and carbon isotope ratios in Eocene and Oligocene planktonic and benthic foraminifera have been investigated from Atlantic, Indian, and Pacific Ocean locations. The major changes in Eocene-Oligocene benthic foraminiferal oxygen isotopes were enrichment of up to 1 per mil in 18O associated with the middle/late Eocene boundary and the Eocene/Oligocene boundary at locations which range from 1- to 4-km paleodepth. Although the synchronous Eocene-Oligocene 18O enrichment began in the latest Eocene, most of the change occurred in the earliest Oligocene. The earliest Oligocene enrichment in 18O is always larger in benthic foraminifera than in surface-dwelling planktonic foraminifera, a condition that indicates a combination of deep-water cooling and increased ice volume. Planktonic foraminiferal d18O does not increase across the middle/late Eocene boundary at our one site with the most complete record (Deep Sea Drilling Project Site 363, Walvis Ridge). This pattern suggests that benthic foraminiferal d18O increased 40 m.y. ago because of increased density of deep waters, probably as a result of cooling, although glaciation cannot be ruled out without more data. Stable isotope data are averaged for late Eocene and earliest Oligocene time intervals to evaluate paleoceanographic change. Average d18O of benthic foraminifera increased by 0.64 per mil from the late Eocene to the early Oligocene d18O maximum, whereas the average increase for planktonic foraminifera was 0.52 per mil. This similarity suggests that the Eocene/Oligocene boundary d18O increase was caused primarily by increased continental glaciation, coupled with deep sea cooling by as much as 2°C at some sites. Average d18O of surface-dwelling planktonic foraminifera from 14 upper Eocene and 17 lower Oligocene locations, when plotted versus paleo-latitude, reveals no change in the latitudinal d18O gradient. The Oligocene data are offset by ~0.45 per mil, also believed to reflect increased continental glaciation. At present, there are too few deep sea ... |
format |
Other/Unknown Material |
author |
Keigwin, Lloyd D Corliss, Bruce H |
author_facet |
Keigwin, Lloyd D Corliss, Bruce H |
author_sort |
Keigwin, Lloyd D |
title |
Oxygen and carbon isotopic composition in Eocene and Oligocene planktonic and benthic foraminifera from DSDP sediments |
title_short |
Oxygen and carbon isotopic composition in Eocene and Oligocene planktonic and benthic foraminifera from DSDP sediments |
title_full |
Oxygen and carbon isotopic composition in Eocene and Oligocene planktonic and benthic foraminifera from DSDP sediments |
title_fullStr |
Oxygen and carbon isotopic composition in Eocene and Oligocene planktonic and benthic foraminifera from DSDP sediments |
title_full_unstemmed |
Oxygen and carbon isotopic composition in Eocene and Oligocene planktonic and benthic foraminifera from DSDP sediments |
title_sort |
oxygen and carbon isotopic composition in eocene and oligocene planktonic and benthic foraminifera from dsdp sediments |
publisher |
PANGAEA |
publishDate |
1986 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.719183 https://doi.org/10.1594/PANGAEA.719183 |
op_coverage |
MEDIAN LATITUDE: 1.604262 * MEDIAN LONGITUDE: -155.069514 * SOUTH-BOUND LATITUDE: -52.223800 * WEST-BOUND LONGITUDE: 9.046700 * NORTH-BOUND LATITUDE: 57.496000 * EAST-BOUND LONGITUDE: -8.810300 * DATE/TIME START: 1968-11-02T00:00:00 * DATE/TIME END: 1983-08-26T00:00:00 |
long_lat |
ENVELOPE(9.046700,-8.810300,57.496000,-52.223800) |
geographic |
Antarctic Antarctic Ocean Indian Pacific |
geographic_facet |
Antarctic Antarctic Ocean Indian Pacific |
genre |
Antarc* Antarctic Antarctic Ocean North Atlantic Planktonic foraminifera |
genre_facet |
Antarc* Antarctic Antarctic Ocean North Atlantic Planktonic foraminifera |
op_source |
Supplement to: Keigwin, Lloyd D; Corliss, Bruce H (1986): Stable isotopes in late middle Eocene to Oligocene foraminifera. Geological Society of America Bulletin, 97(3), 335-345, https://doi.org/10.1130/0016-7606(1986)97%3C335:SIILME%3E2.0.CO;2 |
op_relation |
GSA data repository - Appendix I - Eocene-Oligocene data tables, Appendix II - Paleodepth determination [dataset]. ftp://rock.geosociety.org/pub/reposit/1986/8605.pdf https://doi.pangaea.de/10.1594/PANGAEA.719183 https://doi.org/10.1594/PANGAEA.719183 |
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.71918310.1130/0016-7606(1986)97%3C335:SIILME%3E2.0.CO;2 |
_version_ |
1811644292982112256 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.719183 2024-09-30T14:25:17+00:00 Oxygen and carbon isotopic composition in Eocene and Oligocene planktonic and benthic foraminifera from DSDP sediments Keigwin, Lloyd D Corliss, Bruce H MEDIAN LATITUDE: 1.604262 * MEDIAN LONGITUDE: -155.069514 * SOUTH-BOUND LATITUDE: -52.223800 * WEST-BOUND LONGITUDE: 9.046700 * NORTH-BOUND LATITUDE: 57.496000 * EAST-BOUND LONGITUDE: -8.810300 * DATE/TIME START: 1968-11-02T00:00:00 * DATE/TIME END: 1983-08-26T00:00:00 1986 application/zip, 21 datasets https://doi.pangaea.de/10.1594/PANGAEA.719183 https://doi.org/10.1594/PANGAEA.719183 en eng PANGAEA GSA data repository - Appendix I - Eocene-Oligocene data tables, Appendix II - Paleodepth determination [dataset]. ftp://rock.geosociety.org/pub/reposit/1986/8605.pdf https://doi.pangaea.de/10.1594/PANGAEA.719183 https://doi.org/10.1594/PANGAEA.719183 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Keigwin, Lloyd D; Corliss, Bruce H (1986): Stable isotopes in late middle Eocene to Oligocene foraminifera. Geological Society of America Bulletin, 97(3), 335-345, https://doi.org/10.1130/0016-7606(1986)97%3C335:SIILME%3E2.0.CO;2 10-94 12-116 17-167 2-10 22-214 22-217 23-219 26-253 29-277 31-292 3-19 39-357 40-362 40-363 41-366 48-401 80-548 90-592 90-593 95-612 9-77B Antarctic Ocean/PLATEAU Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Gulf of Mexico/SCARP Indian Ocean//RIDGE Indian Ocean/Arabian Sea/RIDGE Leg10 Leg12 Leg17 Leg2 Leg22 Leg23 Leg26 Leg29 Leg3 Leg31 Leg39 Leg40 Leg41 Leg48 Leg80 Leg9 Leg90 Leg95 North Atlantic/BASIN North Atlantic/CONT RISE dataset publication series 1986 ftpangaea https://doi.org/10.1594/PANGAEA.71918310.1130/0016-7606(1986)97%3C335:SIILME%3E2.0.CO;2 2024-09-03T23:52:03Z Oxygen and carbon isotope ratios in Eocene and Oligocene planktonic and benthic foraminifera have been investigated from Atlantic, Indian, and Pacific Ocean locations. The major changes in Eocene-Oligocene benthic foraminiferal oxygen isotopes were enrichment of up to 1 per mil in 18O associated with the middle/late Eocene boundary and the Eocene/Oligocene boundary at locations which range from 1- to 4-km paleodepth. Although the synchronous Eocene-Oligocene 18O enrichment began in the latest Eocene, most of the change occurred in the earliest Oligocene. The earliest Oligocene enrichment in 18O is always larger in benthic foraminifera than in surface-dwelling planktonic foraminifera, a condition that indicates a combination of deep-water cooling and increased ice volume. Planktonic foraminiferal d18O does not increase across the middle/late Eocene boundary at our one site with the most complete record (Deep Sea Drilling Project Site 363, Walvis Ridge). This pattern suggests that benthic foraminiferal d18O increased 40 m.y. ago because of increased density of deep waters, probably as a result of cooling, although glaciation cannot be ruled out without more data. Stable isotope data are averaged for late Eocene and earliest Oligocene time intervals to evaluate paleoceanographic change. Average d18O of benthic foraminifera increased by 0.64 per mil from the late Eocene to the early Oligocene d18O maximum, whereas the average increase for planktonic foraminifera was 0.52 per mil. This similarity suggests that the Eocene/Oligocene boundary d18O increase was caused primarily by increased continental glaciation, coupled with deep sea cooling by as much as 2°C at some sites. Average d18O of surface-dwelling planktonic foraminifera from 14 upper Eocene and 17 lower Oligocene locations, when plotted versus paleo-latitude, reveals no change in the latitudinal d18O gradient. The Oligocene data are offset by ~0.45 per mil, also believed to reflect increased continental glaciation. At present, there are too few deep sea ... Other/Unknown Material Antarc* Antarctic Antarctic Ocean North Atlantic Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Antarctic Ocean Indian Pacific ENVELOPE(9.046700,-8.810300,57.496000,-52.223800) |