Geochemistry of planktonic foraminifera from DSDP sites in the Atlantic and Pacific Ocean, supplement to: Delaney, Margaret Lois; Boyle, Edwards A (1986): Lithium in foraminiferal shells: implications for high-temperature hydrothermal circulation fluxes and oceanic crustal generation rates. Earth and Planetary Science Letters, 80(1-2), 91-105
The lithium content of planktonic foraminiferal calcite has been determined to evaluate temporal variability of seawater Li concentrations over the past 116 m.y. Mean foraminiferal calcite lithium/calcium in each time interval is no more than 16% greater nor 25% less than the mean Li/Ca of all sampl...
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1986
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ftdatacite:10.1594/pangaea.715079 2023-05-15T18:01:06+02:00 Geochemistry of planktonic foraminifera from DSDP sites in the Atlantic and Pacific Ocean, supplement to: Delaney, Margaret Lois; Boyle, Edwards A (1986): Lithium in foraminiferal shells: implications for high-temperature hydrothermal circulation fluxes and oceanic crustal generation rates. Earth and Planetary Science Letters, 80(1-2), 91-105 Delaney, Margaret Lois Boyle, Edwards A 1986 application/zip https://dx.doi.org/10.1594/pangaea.715079 https://doi.pangaea.de/10.1594/PANGAEA.715079 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1016/0012-821x(86)90022-1 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Drilling/drill rig Composite Core Leg30 Leg32 Leg41 Leg74 Glomar Challenger Deep Sea Drilling Project DSDP Collection article Supplementary Collection of Datasets 1986 ftdatacite https://doi.org/10.1594/pangaea.715079 https://doi.org/10.1016/0012-821x(86)90022-1 2021-11-05T12:55:41Z The lithium content of planktonic foraminiferal calcite has been determined to evaluate temporal variability of seawater Li concentrations over the past 116 m.y. Mean foraminiferal calcite lithium/calcium in each time interval is no more than 16% greater nor 25% less than the mean Li/Ca of all samples. Li/Ca minima are observed for samples from 50-60 m.y. and 80-90 m.y., with Li/Ca about 25% lower than in adjacent time intervals. At no time during the past 40 m.y does mean Li/Ca appear to be higher than that at present. Subject to the limitations imposed by sample coverage and diagenesis, a similar conclusion holds for the past 116 m.y. Coupled with an oceanic mass balance model for Li, these data suggest that: (1) oceanic Li concentrations and, therefore, high-temperature hydrothermal circulation fluxes during the past 40 m.y. (and perhaps the past 100 m.y.) have not been more than perhaps 30-40% greater than at present for intervals any longer than a million years at most, and (2) these fluxes were not a factor of two higher 100 m.y. ago. By inference, variations in oceanic crustal generation rates over these time periods are similarly limited. Decreases in hydrothermal circulation fluxes and crustal generation rates or fluctuations up to 20% in these rates of a few million years duration are not necessarily ruled out by the Li/Ca data. The lack of variability in Li/Ca over time is not unequivocal evidence that hydrothermal fluxes have not varied because the rates of removal processes may be linked to changes in input fluxes. Article in Journal/Newspaper Planktonic foraminifera DataCite Metadata Store (German National Library of Science and Technology) Pacific |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Drilling/drill rig Composite Core Leg30 Leg32 Leg41 Leg74 Glomar Challenger Deep Sea Drilling Project DSDP |
spellingShingle |
Drilling/drill rig Composite Core Leg30 Leg32 Leg41 Leg74 Glomar Challenger Deep Sea Drilling Project DSDP Delaney, Margaret Lois Boyle, Edwards A Geochemistry of planktonic foraminifera from DSDP sites in the Atlantic and Pacific Ocean, supplement to: Delaney, Margaret Lois; Boyle, Edwards A (1986): Lithium in foraminiferal shells: implications for high-temperature hydrothermal circulation fluxes and oceanic crustal generation rates. Earth and Planetary Science Letters, 80(1-2), 91-105 |
topic_facet |
Drilling/drill rig Composite Core Leg30 Leg32 Leg41 Leg74 Glomar Challenger Deep Sea Drilling Project DSDP |
description |
The lithium content of planktonic foraminiferal calcite has been determined to evaluate temporal variability of seawater Li concentrations over the past 116 m.y. Mean foraminiferal calcite lithium/calcium in each time interval is no more than 16% greater nor 25% less than the mean Li/Ca of all samples. Li/Ca minima are observed for samples from 50-60 m.y. and 80-90 m.y., with Li/Ca about 25% lower than in adjacent time intervals. At no time during the past 40 m.y does mean Li/Ca appear to be higher than that at present. Subject to the limitations imposed by sample coverage and diagenesis, a similar conclusion holds for the past 116 m.y. Coupled with an oceanic mass balance model for Li, these data suggest that: (1) oceanic Li concentrations and, therefore, high-temperature hydrothermal circulation fluxes during the past 40 m.y. (and perhaps the past 100 m.y.) have not been more than perhaps 30-40% greater than at present for intervals any longer than a million years at most, and (2) these fluxes were not a factor of two higher 100 m.y. ago. By inference, variations in oceanic crustal generation rates over these time periods are similarly limited. Decreases in hydrothermal circulation fluxes and crustal generation rates or fluctuations up to 20% in these rates of a few million years duration are not necessarily ruled out by the Li/Ca data. The lack of variability in Li/Ca over time is not unequivocal evidence that hydrothermal fluxes have not varied because the rates of removal processes may be linked to changes in input fluxes. |
format |
Article in Journal/Newspaper |
author |
Delaney, Margaret Lois Boyle, Edwards A |
author_facet |
Delaney, Margaret Lois Boyle, Edwards A |
author_sort |
Delaney, Margaret Lois |
title |
Geochemistry of planktonic foraminifera from DSDP sites in the Atlantic and Pacific Ocean, supplement to: Delaney, Margaret Lois; Boyle, Edwards A (1986): Lithium in foraminiferal shells: implications for high-temperature hydrothermal circulation fluxes and oceanic crustal generation rates. Earth and Planetary Science Letters, 80(1-2), 91-105 |
title_short |
Geochemistry of planktonic foraminifera from DSDP sites in the Atlantic and Pacific Ocean, supplement to: Delaney, Margaret Lois; Boyle, Edwards A (1986): Lithium in foraminiferal shells: implications for high-temperature hydrothermal circulation fluxes and oceanic crustal generation rates. Earth and Planetary Science Letters, 80(1-2), 91-105 |
title_full |
Geochemistry of planktonic foraminifera from DSDP sites in the Atlantic and Pacific Ocean, supplement to: Delaney, Margaret Lois; Boyle, Edwards A (1986): Lithium in foraminiferal shells: implications for high-temperature hydrothermal circulation fluxes and oceanic crustal generation rates. Earth and Planetary Science Letters, 80(1-2), 91-105 |
title_fullStr |
Geochemistry of planktonic foraminifera from DSDP sites in the Atlantic and Pacific Ocean, supplement to: Delaney, Margaret Lois; Boyle, Edwards A (1986): Lithium in foraminiferal shells: implications for high-temperature hydrothermal circulation fluxes and oceanic crustal generation rates. Earth and Planetary Science Letters, 80(1-2), 91-105 |
title_full_unstemmed |
Geochemistry of planktonic foraminifera from DSDP sites in the Atlantic and Pacific Ocean, supplement to: Delaney, Margaret Lois; Boyle, Edwards A (1986): Lithium in foraminiferal shells: implications for high-temperature hydrothermal circulation fluxes and oceanic crustal generation rates. Earth and Planetary Science Letters, 80(1-2), 91-105 |
title_sort |
geochemistry of planktonic foraminifera from dsdp sites in the atlantic and pacific ocean, supplement to: delaney, margaret lois; boyle, edwards a (1986): lithium in foraminiferal shells: implications for high-temperature hydrothermal circulation fluxes and oceanic crustal generation rates. earth and planetary science letters, 80(1-2), 91-105 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
1986 |
url |
https://dx.doi.org/10.1594/pangaea.715079 https://doi.pangaea.de/10.1594/PANGAEA.715079 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
https://dx.doi.org/10.1016/0012-821x(86)90022-1 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.715079 https://doi.org/10.1016/0012-821x(86)90022-1 |
_version_ |
1766170447302361088 |