Experimental determination of carbonate-associated sulfate δ^(34)S in planktonic foraminifera shells
Understanding the coupling of oxygen, carbon, and sulfur cycles in the past is critical for reconstructing the history of biogeochemical cycles, paleoclimatic variations, and oceanic chemistry. The abundance of sulfur isotopes (δ^(34)S) in sulfate from ancient marine carbonates, or carbonate-associ...
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Online Access: | https://doi.org/10.1002/2014GC005295 |
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ftcaltechauth:oai:authors.library.caltech.edu:je510-12g80 2024-09-15T18:31:06+00:00 Experimental determination of carbonate-associated sulfate δ^(34)S in planktonic foraminifera shells Paris, Guillaume Fehrenbacher, Jennifer S. Sessions, Alex L. Spero, Howard J. Adkins, Jess F. 2014-04 https://doi.org/10.1002/2014GC005295 unknown American Geophysical Union https://doi.org/10.1002/2014GC005295 oai:authors.library.caltech.edu:je510-12g80 eprintid:46546 resolverid:CaltechAUTHORS:20140627-090728672 info:eu-repo/semantics/openAccess Other Geochemistry, Geophysics, Geosystems, 15(4), 1452-1461, (2014-04) sulfur isotopes foraminifera MC-ICP-MS paleoenvironment info:eu-repo/semantics/article 2014 ftcaltechauth https://doi.org/10.1002/2014GC005295 2024-08-06T15:35:04Z Understanding the coupling of oxygen, carbon, and sulfur cycles in the past is critical for reconstructing the history of biogeochemical cycles, paleoclimatic variations, and oceanic chemistry. The abundance of sulfur isotopes (δ^(34)S) in sulfate from ancient marine carbonates, or carbonate-associated sulfate (CAS), is commonly used, along with other archives (mainly evaporites and barite), to estimate the δ^(34)S of seawater throughout Earth history. Analyses of CAS from hand-picked foraminifera are potentially valuable because this group of organisms is used in numerous paleoceanographic studies. They could provide coupled, high-resolution records of δ^(13)C, δ^(18)O, and δ^(34)S isotopic changes directly linked to orbitally tuned records of climate change through the Cenozoic. Such measurements have not previously been possible due to limitations of sensitivity in conventional IRMS-based techniques. However, the recent development of CAS analysis by multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS) now allows us to work on samples containing just a few nmol of sulfur with accuracy for δ^(34)S values approaching 0.1‰ and, consequently, to analyze hand-picked samples of foraminifera shells. Here we report the results of culture experiments with the planktonic species Orbulina universa, that establish a shell:seawater δ^(34)S calibration for future applications to the fossil record. Our new method uses <650 μg of carbonate (∼15 shells) per analysis. The results show that S isotopes are fractionated consistently by −1‰ between seawater and O. universa tests. We also demonstrate that O. universa faithfully records the [SO^(2−)_(4)]/[Ca^(2+)] ratio of the seawater in which it grew. © 2014 American Geophysical Union. Received 11 February 2014; Accepted 2 April 2014; Accepted article online 4 April 2014; Published online 29 April 2014. We gratefully acknowledge the field assistance of Kate Holland, Jordan Snyder, and Lael Vetter and the staff of the Wrigley Marine ... Article in Journal/Newspaper Planktonic foraminifera Caltech Authors (California Institute of Technology) Geochemistry, Geophysics, Geosystems 15 4 1452 1461 |
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Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
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unknown |
topic |
sulfur isotopes foraminifera MC-ICP-MS paleoenvironment |
spellingShingle |
sulfur isotopes foraminifera MC-ICP-MS paleoenvironment Paris, Guillaume Fehrenbacher, Jennifer S. Sessions, Alex L. Spero, Howard J. Adkins, Jess F. Experimental determination of carbonate-associated sulfate δ^(34)S in planktonic foraminifera shells |
topic_facet |
sulfur isotopes foraminifera MC-ICP-MS paleoenvironment |
description |
Understanding the coupling of oxygen, carbon, and sulfur cycles in the past is critical for reconstructing the history of biogeochemical cycles, paleoclimatic variations, and oceanic chemistry. The abundance of sulfur isotopes (δ^(34)S) in sulfate from ancient marine carbonates, or carbonate-associated sulfate (CAS), is commonly used, along with other archives (mainly evaporites and barite), to estimate the δ^(34)S of seawater throughout Earth history. Analyses of CAS from hand-picked foraminifera are potentially valuable because this group of organisms is used in numerous paleoceanographic studies. They could provide coupled, high-resolution records of δ^(13)C, δ^(18)O, and δ^(34)S isotopic changes directly linked to orbitally tuned records of climate change through the Cenozoic. Such measurements have not previously been possible due to limitations of sensitivity in conventional IRMS-based techniques. However, the recent development of CAS analysis by multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS) now allows us to work on samples containing just a few nmol of sulfur with accuracy for δ^(34)S values approaching 0.1‰ and, consequently, to analyze hand-picked samples of foraminifera shells. Here we report the results of culture experiments with the planktonic species Orbulina universa, that establish a shell:seawater δ^(34)S calibration for future applications to the fossil record. Our new method uses <650 μg of carbonate (∼15 shells) per analysis. The results show that S isotopes are fractionated consistently by −1‰ between seawater and O. universa tests. We also demonstrate that O. universa faithfully records the [SO^(2−)_(4)]/[Ca^(2+)] ratio of the seawater in which it grew. © 2014 American Geophysical Union. Received 11 February 2014; Accepted 2 April 2014; Accepted article online 4 April 2014; Published online 29 April 2014. We gratefully acknowledge the field assistance of Kate Holland, Jordan Snyder, and Lael Vetter and the staff of the Wrigley Marine ... |
format |
Article in Journal/Newspaper |
author |
Paris, Guillaume Fehrenbacher, Jennifer S. Sessions, Alex L. Spero, Howard J. Adkins, Jess F. |
author_facet |
Paris, Guillaume Fehrenbacher, Jennifer S. Sessions, Alex L. Spero, Howard J. Adkins, Jess F. |
author_sort |
Paris, Guillaume |
title |
Experimental determination of carbonate-associated sulfate δ^(34)S in planktonic foraminifera shells |
title_short |
Experimental determination of carbonate-associated sulfate δ^(34)S in planktonic foraminifera shells |
title_full |
Experimental determination of carbonate-associated sulfate δ^(34)S in planktonic foraminifera shells |
title_fullStr |
Experimental determination of carbonate-associated sulfate δ^(34)S in planktonic foraminifera shells |
title_full_unstemmed |
Experimental determination of carbonate-associated sulfate δ^(34)S in planktonic foraminifera shells |
title_sort |
experimental determination of carbonate-associated sulfate î´^(34)s in planktonic foraminifera shells |
publisher |
American Geophysical Union |
publishDate |
2014 |
url |
https://doi.org/10.1002/2014GC005295 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Geochemistry, Geophysics, Geosystems, 15(4), 1452-1461, (2014-04) |
op_relation |
https://doi.org/10.1002/2014GC005295 oai:authors.library.caltech.edu:je510-12g80 eprintid:46546 resolverid:CaltechAUTHORS:20140627-090728672 |
op_rights |
info:eu-repo/semantics/openAccess Other |
op_doi |
https://doi.org/10.1002/2014GC005295 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
15 |
container_issue |
4 |
container_start_page |
1452 |
op_container_end_page |
1461 |
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1810472713666428928 |