13C-18O 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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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:1941 2023-05-15T15:10:25+02:00 13C-18O isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths Tripati, A. K. Eagle, Robert A. Thiagarajan, Nivedita Gagnon, Alexander C. Bauch, Henning Halloran, Paul R. Eiler, John M. 2010-10 application/pdf http://eprints.esc.cam.ac.uk/1941/ http://eprints.esc.cam.ac.uk/1941/1/A_Tripati_sdarticle.pdf http://linkinghub.elsevier.com/retrieve/pii/S0016703710003959 https://doi.org/10.1016/j.gca.2010.07.006 en eng http://eprints.esc.cam.ac.uk/1941/1/A_Tripati_sdarticle.pdf Tripati, A. K. and Eagle, Robert A. and Thiagarajan, Nivedita and Gagnon, Alexander C. and Bauch, Henning and Halloran, Paul R. and Eiler, John M. (2010) 13C-18O isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths. Geochimica et Cosmochimica Acta, 74 (20). pp. 5697-5717. DOI https://doi.org/10.1016/j.gca.2010.07.006 <https://doi.org/10.1016/j.gca.2010.07.006> 01 - Climate Change and Earth-Ocean Atmosphere Systems Article PeerReviewed 2010 ftucambridgeesc https://doi.org/10.1016/j.gca.2010.07.006 2020-08-27T18:09:05Z 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 13C–18O 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 18O/16O (δ18O) and 13C/12C (δ13C) ratios are characterized by 13C–18O 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. Article in Journal/Newspaper Arctic Arctic Ocean Climate change Foraminifera* University of Cambridge, Department of Earth Sciences: ESC Publications Arctic Arctic Ocean Geochimica et Cosmochimica Acta 74 20 5697 5717 |
institution |
Open Polar |
collection |
University of Cambridge, Department of Earth Sciences: ESC Publications |
op_collection_id |
ftucambridgeesc |
language |
English |
topic |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
spellingShingle |
01 - Climate Change and Earth-Ocean Atmosphere Systems Tripati, A. K. Eagle, Robert A. Thiagarajan, Nivedita Gagnon, Alexander C. Bauch, Henning Halloran, Paul R. Eiler, John M. 13C-18O isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths |
topic_facet |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
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 13C–18O 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 18O/16O (δ18O) and 13C/12C (δ13C) ratios are characterized by 13C–18O 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. |
format |
Article in Journal/Newspaper |
author |
Tripati, A. K. Eagle, Robert A. Thiagarajan, Nivedita Gagnon, Alexander C. Bauch, Henning Halloran, Paul R. Eiler, John M. |
author_facet |
Tripati, A. K. Eagle, Robert A. Thiagarajan, Nivedita Gagnon, Alexander C. Bauch, Henning Halloran, Paul R. Eiler, John M. |
author_sort |
Tripati, A. K. |
title |
13C-18O isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths |
title_short |
13C-18O isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths |
title_full |
13C-18O isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths |
title_fullStr |
13C-18O isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths |
title_full_unstemmed |
13C-18O isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths |
title_sort |
13c-18o isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths |
publishDate |
2010 |
url |
http://eprints.esc.cam.ac.uk/1941/ http://eprints.esc.cam.ac.uk/1941/1/A_Tripati_sdarticle.pdf http://linkinghub.elsevier.com/retrieve/pii/S0016703710003959 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_relation |
http://eprints.esc.cam.ac.uk/1941/1/A_Tripati_sdarticle.pdf Tripati, A. K. and Eagle, Robert A. and Thiagarajan, Nivedita and Gagnon, Alexander C. and Bauch, Henning and Halloran, Paul R. and Eiler, John M. (2010) 13C-18O isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths. Geochimica et Cosmochimica Acta, 74 (20). pp. 5697-5717. DOI https://doi.org/10.1016/j.gca.2010.07.006 <https://doi.org/10.1016/j.gca.2010.07.006> |
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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1766341457006821376 |