Planktonic foraminiferal 87Sr/86Sr ratios of sediment cores from the Pacific and Indian Ocean
Fluctuations in the 87Sr/86Sr ratio of seawater accompanying glacial/interglacial climate changes have been reported in recent studies but remain highly controversial. To investigate these potential fluctuations we present very high precision (13 ppm) 87Sr/86Sr measurements on planktonic foraminifer...
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1994
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.712123 2023-05-15T18:01:14+02:00 Planktonic foraminiferal 87Sr/86Sr ratios of sediment cores from the Pacific and Indian Ocean Henderson, Gideon M Martel, D J O'Nions, R K Shackleton, Nicholas J MEDIAN LATITUDE: 1.672267 * MEDIAN LONGITUDE: 125.114542 * SOUTH-BOUND LATITUDE: -1.467000 * WEST-BOUND LONGITUDE: 90.167000 * NORTH-BOUND LATITUDE: 5.384067 * EAST-BOUND LONGITUDE: 160.480000 * DATE/TIME START: 1971-03-23T00:00:00 * DATE/TIME END: 1988-06-15T00:00:00 1994-02-03 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.712123 https://doi.org/10.1594/PANGAEA.712123 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.712123 https://doi.org/10.1594/PANGAEA.712123 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Henderson, Gideon M; Martel, D J; O'Nions, R K; Shackleton, Nicholas J (1994): Evolution of seawater 87Sr/86Sr over the last 400 ka: the absence of glacial/interglacial cycles. Earth and Planetary Science Letters, 128(3-4), 643-651, https://doi.org/10.1016/0012-821X(94)90176-7 121-758 COMPCORE Composite Core Indian Ocean Joides Resolution Leg121 Ocean Drilling Program ODP PC Piston corer RC14 RC14-37 RC17 RC17-177 Robert Conrad V28 V28-238 Vema Dataset 1994 ftpangaea https://doi.org/10.1594/PANGAEA.712123 https://doi.org/10.1016/0012-821X(94)90176-7 2023-01-20T07:31:22Z Fluctuations in the 87Sr/86Sr ratio of seawater accompanying glacial/interglacial climate changes have been reported in recent studies but remain highly controversial. To investigate these potential fluctuations we present very high precision (13 ppm) 87Sr/86Sr measurements on planktonic foraminifera from Indian Ocean and Pacific cores. 87Sr/86Sr ratios from three different foraminiferal species are indistinguishable from one another in both core-top and 50 ka samples, demonstrating that changes due to diagenesis or contamination do not influence the measurements. Average 87Sr/86Sr ratios for Pacific Ocean and Indian Ocean samples are also indistinguishable at three intervals (core-top, 50 ka and 300-370 ka), demonstrating that the oceans have remained well mixed with respect to Sr. Also, 87Sr/86Sr ratios are not affected by changes in the precleaning of samples. Measurements from Pacific core V28-238, that used in the study of Dia et al. (1992, doi:10.1038/356786a0), do not reproduce the cycles seen in the previous study and are statistically well explained by a linear increase in the seawater 87Sr/86Sr ratio. It seems likely that an analytical artefact caused the cycles in the previous study. Measurements from two key sections of core from ODP site 758, that used in the study of Clemens et al. (1993, doi:10.1038/363607a0), do not reproduce the largest shifts seen in the previous study, despite the considerably better precision reported here. The apparent cyclicity in the Clemens et al. (1993) data is also suggested to be due to an unknown analytical artefact. The 48 measurements presented here are a statistically good fit to a straight line defined by Delta 87Sr (ppm) = -0.0613 * age (ka). At the 13 ppm level of precision no evidence for a glacial/interglacial variation in the seawater 87Sr/86Sr ratio is seen. Glacial/interglacial variation may still exist but this data constraints its maximum amplitude to 6-9 ppm, which would correspond to changes in the riverine Sr flux of c. 30%. Dataset Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science Indian Pacific ENVELOPE(90.167000,160.480000,5.384067,-1.467000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
121-758 COMPCORE Composite Core Indian Ocean Joides Resolution Leg121 Ocean Drilling Program ODP PC Piston corer RC14 RC14-37 RC17 RC17-177 Robert Conrad V28 V28-238 Vema |
spellingShingle |
121-758 COMPCORE Composite Core Indian Ocean Joides Resolution Leg121 Ocean Drilling Program ODP PC Piston corer RC14 RC14-37 RC17 RC17-177 Robert Conrad V28 V28-238 Vema Henderson, Gideon M Martel, D J O'Nions, R K Shackleton, Nicholas J Planktonic foraminiferal 87Sr/86Sr ratios of sediment cores from the Pacific and Indian Ocean |
topic_facet |
121-758 COMPCORE Composite Core Indian Ocean Joides Resolution Leg121 Ocean Drilling Program ODP PC Piston corer RC14 RC14-37 RC17 RC17-177 Robert Conrad V28 V28-238 Vema |
description |
Fluctuations in the 87Sr/86Sr ratio of seawater accompanying glacial/interglacial climate changes have been reported in recent studies but remain highly controversial. To investigate these potential fluctuations we present very high precision (13 ppm) 87Sr/86Sr measurements on planktonic foraminifera from Indian Ocean and Pacific cores. 87Sr/86Sr ratios from three different foraminiferal species are indistinguishable from one another in both core-top and 50 ka samples, demonstrating that changes due to diagenesis or contamination do not influence the measurements. Average 87Sr/86Sr ratios for Pacific Ocean and Indian Ocean samples are also indistinguishable at three intervals (core-top, 50 ka and 300-370 ka), demonstrating that the oceans have remained well mixed with respect to Sr. Also, 87Sr/86Sr ratios are not affected by changes in the precleaning of samples. Measurements from Pacific core V28-238, that used in the study of Dia et al. (1992, doi:10.1038/356786a0), do not reproduce the cycles seen in the previous study and are statistically well explained by a linear increase in the seawater 87Sr/86Sr ratio. It seems likely that an analytical artefact caused the cycles in the previous study. Measurements from two key sections of core from ODP site 758, that used in the study of Clemens et al. (1993, doi:10.1038/363607a0), do not reproduce the largest shifts seen in the previous study, despite the considerably better precision reported here. The apparent cyclicity in the Clemens et al. (1993) data is also suggested to be due to an unknown analytical artefact. The 48 measurements presented here are a statistically good fit to a straight line defined by Delta 87Sr (ppm) = -0.0613 * age (ka). At the 13 ppm level of precision no evidence for a glacial/interglacial variation in the seawater 87Sr/86Sr ratio is seen. Glacial/interglacial variation may still exist but this data constraints its maximum amplitude to 6-9 ppm, which would correspond to changes in the riverine Sr flux of c. 30%. |
format |
Dataset |
author |
Henderson, Gideon M Martel, D J O'Nions, R K Shackleton, Nicholas J |
author_facet |
Henderson, Gideon M Martel, D J O'Nions, R K Shackleton, Nicholas J |
author_sort |
Henderson, Gideon M |
title |
Planktonic foraminiferal 87Sr/86Sr ratios of sediment cores from the Pacific and Indian Ocean |
title_short |
Planktonic foraminiferal 87Sr/86Sr ratios of sediment cores from the Pacific and Indian Ocean |
title_full |
Planktonic foraminiferal 87Sr/86Sr ratios of sediment cores from the Pacific and Indian Ocean |
title_fullStr |
Planktonic foraminiferal 87Sr/86Sr ratios of sediment cores from the Pacific and Indian Ocean |
title_full_unstemmed |
Planktonic foraminiferal 87Sr/86Sr ratios of sediment cores from the Pacific and Indian Ocean |
title_sort |
planktonic foraminiferal 87sr/86sr ratios of sediment cores from the pacific and indian ocean |
publisher |
PANGAEA |
publishDate |
1994 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.712123 https://doi.org/10.1594/PANGAEA.712123 |
op_coverage |
MEDIAN LATITUDE: 1.672267 * MEDIAN LONGITUDE: 125.114542 * SOUTH-BOUND LATITUDE: -1.467000 * WEST-BOUND LONGITUDE: 90.167000 * NORTH-BOUND LATITUDE: 5.384067 * EAST-BOUND LONGITUDE: 160.480000 * DATE/TIME START: 1971-03-23T00:00:00 * DATE/TIME END: 1988-06-15T00:00:00 |
long_lat |
ENVELOPE(90.167000,160.480000,5.384067,-1.467000) |
geographic |
Indian Pacific |
geographic_facet |
Indian Pacific |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Supplement to: Henderson, Gideon M; Martel, D J; O'Nions, R K; Shackleton, Nicholas J (1994): Evolution of seawater 87Sr/86Sr over the last 400 ka: the absence of glacial/interglacial cycles. Earth and Planetary Science Letters, 128(3-4), 643-651, https://doi.org/10.1016/0012-821X(94)90176-7 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.712123 https://doi.org/10.1594/PANGAEA.712123 |
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.712123 https://doi.org/10.1016/0012-821X(94)90176-7 |
_version_ |
1766170623775604736 |