Inside story: An X-ray computed tomography method for assessing dissolution in the tests of planktonic foraminifera
X-ray computed tomography (CT) provides an insight into the progression of dissolution in the tests of planktonic foraminifera. Four species of foraminifera (G. ruber [white], G. sacculifer, N. dutertrei and P. obliquiloculata) from Pacific, Atlantic and Indian Ocean core-top samples were examined b...
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:1960 2023-05-15T18:00:35+02:00 Inside story: An X-ray computed tomography method for assessing dissolution in the tests of planktonic foraminifera Johnstone, Heather J.H. Schulz, Michael Barker, Stephen Elderfield, Henry 2010-10 application/pdf http://eprints.esc.cam.ac.uk/1960/ http://eprints.esc.cam.ac.uk/1960/1/HE_Marine_Micro.pdf https://doi.org/10.1016/j.marmicro.2010.07.004 en eng http://eprints.esc.cam.ac.uk/1960/1/HE_Marine_Micro.pdf Johnstone, Heather J.H. and Schulz, Michael and Barker, Stephen and Elderfield, Henry (2010) Inside story: An X-ray computed tomography method for assessing dissolution in the tests of planktonic foraminifera. Marine Micropaleontology, 77 (1-2). p. 58. ISSN 03778398 DOI https://doi.org/10.1016/j.marmicro.2010.07.004 <https://doi.org/10.1016/j.marmicro.2010.07.004> 01 - Climate Change and Earth-Ocean Atmosphere Systems Article PeerReviewed 2010 ftucambridgeesc https://doi.org/10.1016/j.marmicro.2010.07.004 2020-08-27T18:09:05Z X-ray computed tomography (CT) provides an insight into the progression of dissolution in the tests of planktonic foraminifera. Four species of foraminifera (G. ruber [white], G. sacculifer, N. dutertrei and P. obliquiloculata) from Pacific, Atlantic and Indian Ocean core-top samples were examined by CT and SEM. Inner chamber walls began to dissolve at Δ[CO32−] values of 12–14 μmol/kg. Close to the calcite saturation horizon, dissolution and precipitation of calcite may occur simultaneously. Inner calcite of G. sacculifer, N. dutertrei and P. obliquiloculata from such sites appeared altered or replaced, whereas outer crust calcite was dense with no pores. Unlike the other species, there was no distinction between inner and outer calcite in CT scans of G. ruber. Empty calcite crusts of N. dutertrei and P. obliquiloculata were most resistant to dissolution and were present in samples where Δ[CO32−] ≈ − 20 μmol/kg. Five stages of preservation were identified in CT scans, and an empirical dissolution index, XDX, was established. XDX appears to be insensitive to initial test mass. Mass loss in response to dissolution was similar between species and sites at ~ 0.4 μg/μmol/kg. We provide calibrations to estimate Δ[CO32−] and initial test mass from XDX. Article in Journal/Newspaper Planktonic foraminifera University of Cambridge, Department of Earth Sciences: ESC Publications Pacific Indian Marine Micropaleontology 77 1-2 58 70 |
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 Johnstone, Heather J.H. Schulz, Michael Barker, Stephen Elderfield, Henry Inside story: An X-ray computed tomography method for assessing dissolution in the tests of planktonic foraminifera |
topic_facet |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
description |
X-ray computed tomography (CT) provides an insight into the progression of dissolution in the tests of planktonic foraminifera. Four species of foraminifera (G. ruber [white], G. sacculifer, N. dutertrei and P. obliquiloculata) from Pacific, Atlantic and Indian Ocean core-top samples were examined by CT and SEM. Inner chamber walls began to dissolve at Δ[CO32−] values of 12–14 μmol/kg. Close to the calcite saturation horizon, dissolution and precipitation of calcite may occur simultaneously. Inner calcite of G. sacculifer, N. dutertrei and P. obliquiloculata from such sites appeared altered or replaced, whereas outer crust calcite was dense with no pores. Unlike the other species, there was no distinction between inner and outer calcite in CT scans of G. ruber. Empty calcite crusts of N. dutertrei and P. obliquiloculata were most resistant to dissolution and were present in samples where Δ[CO32−] ≈ − 20 μmol/kg. Five stages of preservation were identified in CT scans, and an empirical dissolution index, XDX, was established. XDX appears to be insensitive to initial test mass. Mass loss in response to dissolution was similar between species and sites at ~ 0.4 μg/μmol/kg. We provide calibrations to estimate Δ[CO32−] and initial test mass from XDX. |
format |
Article in Journal/Newspaper |
author |
Johnstone, Heather J.H. Schulz, Michael Barker, Stephen Elderfield, Henry |
author_facet |
Johnstone, Heather J.H. Schulz, Michael Barker, Stephen Elderfield, Henry |
author_sort |
Johnstone, Heather J.H. |
title |
Inside story: An X-ray computed tomography method for assessing dissolution in the tests of planktonic foraminifera |
title_short |
Inside story: An X-ray computed tomography method for assessing dissolution in the tests of planktonic foraminifera |
title_full |
Inside story: An X-ray computed tomography method for assessing dissolution in the tests of planktonic foraminifera |
title_fullStr |
Inside story: An X-ray computed tomography method for assessing dissolution in the tests of planktonic foraminifera |
title_full_unstemmed |
Inside story: An X-ray computed tomography method for assessing dissolution in the tests of planktonic foraminifera |
title_sort |
inside story: an x-ray computed tomography method for assessing dissolution in the tests of planktonic foraminifera |
publishDate |
2010 |
url |
http://eprints.esc.cam.ac.uk/1960/ http://eprints.esc.cam.ac.uk/1960/1/HE_Marine_Micro.pdf https://doi.org/10.1016/j.marmicro.2010.07.004 |
geographic |
Pacific Indian |
geographic_facet |
Pacific Indian |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
http://eprints.esc.cam.ac.uk/1960/1/HE_Marine_Micro.pdf Johnstone, Heather J.H. and Schulz, Michael and Barker, Stephen and Elderfield, Henry (2010) Inside story: An X-ray computed tomography method for assessing dissolution in the tests of planktonic foraminifera. Marine Micropaleontology, 77 (1-2). p. 58. ISSN 03778398 DOI https://doi.org/10.1016/j.marmicro.2010.07.004 <https://doi.org/10.1016/j.marmicro.2010.07.004> |
op_doi |
https://doi.org/10.1016/j.marmicro.2010.07.004 |
container_title |
Marine Micropaleontology |
container_volume |
77 |
container_issue |
1-2 |
container_start_page |
58 |
op_container_end_page |
70 |
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1766169757394927616 |