Lithium-to-calcium ratios in Modern, Cenozoic, and Paleozoic articulate brachiopod shells
Li/Ca ratios in modern brachiopod shells generally correlate inversely with growth temperature, ranging from ∼20 µmol/mol at 30°C to ∼50 µmol/mol at 0°C with no apparent interspecific offsets. Causes of the temperature effect on Li/Ca ratios are not yet understood. Cenozoic brachiopod Li/Ca ratios a...
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1989
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ftoceanrep:oai:oceanrep.geomar.de:29490 2023-05-15T18:00:55+02:00 Lithium-to-calcium ratios in Modern, Cenozoic, and Paleozoic articulate brachiopod shells Delaney, M. L. Popp, B. N. Lepzelter, C. G. Anderson, T. F. 1989 text https://oceanrep.geomar.de/id/eprint/29490/ https://oceanrep.geomar.de/id/eprint/29490/1/Delaney.pdf https://doi.org/10.1029/PA004i006p00681 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/29490/1/Delaney.pdf Delaney, M. L., Popp, B. N., Lepzelter, C. G. and Anderson, T. F. (1989) Lithium-to-calcium ratios in Modern, Cenozoic, and Paleozoic articulate brachiopod shells. Paleoceanography, 4 (6). pp. 681-691. DOI 10.1029/PA004i006p00681 <https://doi.org/10.1029/PA004i006p00681>. doi:10.1029/PA004i006p00681 cc_by_3.0 Article PeerReviewed 1989 ftoceanrep https://doi.org/10.1029/PA004i006p00681 2023-04-07T15:20:25Z Li/Ca ratios in modern brachiopod shells generally correlate inversely with growth temperature, ranging from ∼20 µmol/mol at 30°C to ∼50 µmol/mol at 0°C with no apparent interspecific offsets. Causes of the temperature effect on Li/Ca ratios are not yet understood. Cenozoic brachiopod Li/Ca ratios average ∼30 µmol/mol, similar to the average observed in modern brachiopods. Relatively constant Li/Ca ratios for Eocene to Pleistocene nonluminescent brachiopod shells, consistent with previous observations of Cenozoic planktonic foraminifera, support the conclusion of little variation in Cenozoic seawater Li/Ca. Nonluminescent portions of Permian and Carboniferous brachiopods have Li/Ca ratios substantially lower (generally <10 µmol/mol) than modern, Cenozoic, or Devonian samples. Mass balance considerations, constrained by δ18O of brachiopods, suggest that low Li concentrations in Permo-Carboniferous seawater could be the result of a lower flux of dissolved Li from the continents and/or a higher flux of Li from seawater to clastic marine sediments. Nonluminescent Devonian brachiopods from a single hand specimen have Li/Ca ratios around 70% of the modern average. These Li/Ca ratios can be explained by either somewhat higher temperature with constant seawater Li/Ca, somewhat lower seawater Li/Ca at constant temperature, or a combination of slightly elevated temperature and slightly lower seawater Li/Ca. Article in Journal/Newspaper Planktonic foraminifera OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Paleoceanography 4 6 681 691 |
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English |
description |
Li/Ca ratios in modern brachiopod shells generally correlate inversely with growth temperature, ranging from ∼20 µmol/mol at 30°C to ∼50 µmol/mol at 0°C with no apparent interspecific offsets. Causes of the temperature effect on Li/Ca ratios are not yet understood. Cenozoic brachiopod Li/Ca ratios average ∼30 µmol/mol, similar to the average observed in modern brachiopods. Relatively constant Li/Ca ratios for Eocene to Pleistocene nonluminescent brachiopod shells, consistent with previous observations of Cenozoic planktonic foraminifera, support the conclusion of little variation in Cenozoic seawater Li/Ca. Nonluminescent portions of Permian and Carboniferous brachiopods have Li/Ca ratios substantially lower (generally <10 µmol/mol) than modern, Cenozoic, or Devonian samples. Mass balance considerations, constrained by δ18O of brachiopods, suggest that low Li concentrations in Permo-Carboniferous seawater could be the result of a lower flux of dissolved Li from the continents and/or a higher flux of Li from seawater to clastic marine sediments. Nonluminescent Devonian brachiopods from a single hand specimen have Li/Ca ratios around 70% of the modern average. These Li/Ca ratios can be explained by either somewhat higher temperature with constant seawater Li/Ca, somewhat lower seawater Li/Ca at constant temperature, or a combination of slightly elevated temperature and slightly lower seawater Li/Ca. |
format |
Article in Journal/Newspaper |
author |
Delaney, M. L. Popp, B. N. Lepzelter, C. G. Anderson, T. F. |
spellingShingle |
Delaney, M. L. Popp, B. N. Lepzelter, C. G. Anderson, T. F. Lithium-to-calcium ratios in Modern, Cenozoic, and Paleozoic articulate brachiopod shells |
author_facet |
Delaney, M. L. Popp, B. N. Lepzelter, C. G. Anderson, T. F. |
author_sort |
Delaney, M. L. |
title |
Lithium-to-calcium ratios in Modern, Cenozoic, and Paleozoic articulate brachiopod shells |
title_short |
Lithium-to-calcium ratios in Modern, Cenozoic, and Paleozoic articulate brachiopod shells |
title_full |
Lithium-to-calcium ratios in Modern, Cenozoic, and Paleozoic articulate brachiopod shells |
title_fullStr |
Lithium-to-calcium ratios in Modern, Cenozoic, and Paleozoic articulate brachiopod shells |
title_full_unstemmed |
Lithium-to-calcium ratios in Modern, Cenozoic, and Paleozoic articulate brachiopod shells |
title_sort |
lithium-to-calcium ratios in modern, cenozoic, and paleozoic articulate brachiopod shells |
publisher |
AGU (American Geophysical Union) |
publishDate |
1989 |
url |
https://oceanrep.geomar.de/id/eprint/29490/ https://oceanrep.geomar.de/id/eprint/29490/1/Delaney.pdf https://doi.org/10.1029/PA004i006p00681 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
https://oceanrep.geomar.de/id/eprint/29490/1/Delaney.pdf Delaney, M. L., Popp, B. N., Lepzelter, C. G. and Anderson, T. F. (1989) Lithium-to-calcium ratios in Modern, Cenozoic, and Paleozoic articulate brachiopod shells. Paleoceanography, 4 (6). pp. 681-691. DOI 10.1029/PA004i006p00681 <https://doi.org/10.1029/PA004i006p00681>. doi:10.1029/PA004i006p00681 |
op_rights |
cc_by_3.0 |
op_doi |
https://doi.org/10.1029/PA004i006p00681 |
container_title |
Paleoceanography |
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4 |
container_issue |
6 |
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681 |
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691 |
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