^(13)C–^(18)O isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths
Accurate constraints on past ocean temperatures and compositions are critical for documenting climate change and resolving its causes. Most proxies for temperature are not thermodynamically based, appear to be subject to biological processes, require regional calibrations, and/or are influenced by f...
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ftcaltechauth:oai:authors.library.caltech.edu:gapy7-xk844 2024-10-13T14:05:40+00:00 ^(13)C–^(18)O isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths Tripati, Aradhna K. Eagle, Robert A. Thiagarajan, Nivedita Gagnon, Alexander C. Bauch, Henning Halloran, Paul R. Eiler, John M. 2010-10-15 https://doi.org/10.1016/j.gca.2010.07.006 unknown Elsevier https://doi.org/10.1016/j.gca.2010.07.006 eprintid:20566 info:eu-repo/semantics/closedAccess Other Geochimica et Cosmochimica Acta, 74(20), 5697-5717, (2010-10-15) info:eu-repo/semantics/article 2010 ftcaltechauth https://doi.org/10.1016/j.gca.2010.07.006 2024-09-25T18:46:40Z Accurate constraints on past ocean temperatures and compositions are critical for documenting climate change and resolving its causes. Most proxies for temperature are not thermodynamically based, appear to be subject to biological processes, require regional calibrations, and/or are influenced by fluid composition. As a result, their interpretation becomes uncertain when they are applied in settings not necessarily resembling those in which they were empirically calibrated. Independent proxies for past temperature could provide an important means of testing and/or expanding on existing reconstructions. Here we report measurements of abundances of stable isotopologues of calcitic and aragonitic benthic and planktic foraminifera and coccoliths, relate those abundances to independently estimated growth temperatures, and discuss the possible scope of equilibrium and kinetic isotope effects. The proportions of ^(13)C–^(18)O bonds in these samples exhibits a temperature dependence that is generally similar to that previously been reported for inorganic calcite and other biologically precipitated carbonate-containing minerals (apatite from fish, reptile, and mammal teeth; calcitic brachiopods and molluscs; aragonitic coral and mollusks). Most species that exhibit non-equilibrium ^(18)O/^(16)O (δ^(18)O) and ^(13)C/^(12)C (δ^(13)C) ratios are characterized by ^(13)C–^(18)O bond abundances that are similar to inorganic calcite and are generally indistinguishable from apparent equilibrium, with possible exceptions among benthic foraminiferal samples from the Arctic Ocean where temperatures are near-freezing. Observed isotope ratios in biogenic carbonates can be explained if carbonate minerals generally preserve a state of ordering that reflects the extent of isotopic equilibration of the dissolved inorganic carbon species. © 2010 Elsevier Ltd. Received 12 August 2009; accepted 1 July 2010. Associate editor: Clark Johnson. Available online 15 July 2010. Support for this project was provided by the UCLA Division of ... Article in Journal/Newspaper Arctic Arctic Ocean Climate change Foraminifera* Caltech Authors (California Institute of Technology) Arctic Arctic Ocean Geochimica et Cosmochimica Acta 74 20 5697 5717 |
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Caltech Authors (California Institute of Technology) |
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description |
Accurate constraints on past ocean temperatures and compositions are critical for documenting climate change and resolving its causes. Most proxies for temperature are not thermodynamically based, appear to be subject to biological processes, require regional calibrations, and/or are influenced by fluid composition. As a result, their interpretation becomes uncertain when they are applied in settings not necessarily resembling those in which they were empirically calibrated. Independent proxies for past temperature could provide an important means of testing and/or expanding on existing reconstructions. Here we report measurements of abundances of stable isotopologues of calcitic and aragonitic benthic and planktic foraminifera and coccoliths, relate those abundances to independently estimated growth temperatures, and discuss the possible scope of equilibrium and kinetic isotope effects. The proportions of ^(13)C–^(18)O bonds in these samples exhibits a temperature dependence that is generally similar to that previously been reported for inorganic calcite and other biologically precipitated carbonate-containing minerals (apatite from fish, reptile, and mammal teeth; calcitic brachiopods and molluscs; aragonitic coral and mollusks). Most species that exhibit non-equilibrium ^(18)O/^(16)O (δ^(18)O) and ^(13)C/^(12)C (δ^(13)C) ratios are characterized by ^(13)C–^(18)O bond abundances that are similar to inorganic calcite and are generally indistinguishable from apparent equilibrium, with possible exceptions among benthic foraminiferal samples from the Arctic Ocean where temperatures are near-freezing. Observed isotope ratios in biogenic carbonates can be explained if carbonate minerals generally preserve a state of ordering that reflects the extent of isotopic equilibration of the dissolved inorganic carbon species. © 2010 Elsevier Ltd. Received 12 August 2009; accepted 1 July 2010. Associate editor: Clark Johnson. Available online 15 July 2010. Support for this project was provided by the UCLA Division of ... |
format |
Article in Journal/Newspaper |
author |
Tripati, Aradhna K. Eagle, Robert A. Thiagarajan, Nivedita Gagnon, Alexander C. Bauch, Henning Halloran, Paul R. Eiler, John M. |
spellingShingle |
Tripati, Aradhna K. Eagle, Robert A. Thiagarajan, Nivedita Gagnon, Alexander C. Bauch, Henning Halloran, Paul R. Eiler, John M. ^(13)C–^(18)O isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths |
author_facet |
Tripati, Aradhna K. Eagle, Robert A. Thiagarajan, Nivedita Gagnon, Alexander C. Bauch, Henning Halloran, Paul R. Eiler, John M. |
author_sort |
Tripati, Aradhna K. |
title |
^(13)C–^(18)O isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths |
title_short |
^(13)C–^(18)O isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths |
title_full |
^(13)C–^(18)O isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths |
title_fullStr |
^(13)C–^(18)O isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths |
title_full_unstemmed |
^(13)C–^(18)O isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths |
title_sort |
^(13)c–^(18)o isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths |
publisher |
Elsevier |
publishDate |
2010 |
url |
https://doi.org/10.1016/j.gca.2010.07.006 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Climate change Foraminifera* |
genre_facet |
Arctic Arctic Ocean Climate change Foraminifera* |
op_source |
Geochimica et Cosmochimica Acta, 74(20), 5697-5717, (2010-10-15) |
op_relation |
https://doi.org/10.1016/j.gca.2010.07.006 eprintid:20566 |
op_rights |
info:eu-repo/semantics/closedAccess Other |
op_doi |
https://doi.org/10.1016/j.gca.2010.07.006 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
74 |
container_issue |
20 |
container_start_page |
5697 |
op_container_end_page |
5717 |
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1812811724132188160 |