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...
Published in: | Marine Micropaleontology |
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2010
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Online Access: | https://orca.cardiff.ac.uk/id/eprint/11089/ https://doi.org/10.1016/j.marmicro.2010.07.004 |
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:11089 2023-05-15T18:00:36+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 https://orca.cardiff.ac.uk/id/eprint/11089/ https://doi.org/10.1016/j.marmicro.2010.07.004 unknown Elsevier Johnstone, Heather J. H., Schulz, Michael, Barker, Stephen https://orca.cardiff.ac.uk/view/cardiffauthors/A015364W.html orcid:0000-0001-7870-6431 orcid:0000-0001-7870-6431 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) , pp. 58-70. 10.1016/j.marmicro.2010.07.004 https://doi.org/10.1016/j.marmicro.2010.07.004 doi:10.1016/j.marmicro.2010.07.004 GC Oceanography QE Geology Article PeerReviewed 2010 ftunivcardiff https://doi.org/10.1016/j.marmicro.2010.07.004 2022-10-20T22:34:30Z 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 Cardiff University: ORCA (Online Research @ Cardiff) Indian Pacific Marine Micropaleontology 77 1-2 58 70 |
institution |
Open Polar |
collection |
Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
unknown |
topic |
GC Oceanography QE Geology |
spellingShingle |
GC Oceanography QE Geology 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 |
GC Oceanography QE Geology |
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 |
publisher |
Elsevier |
publishDate |
2010 |
url |
https://orca.cardiff.ac.uk/id/eprint/11089/ https://doi.org/10.1016/j.marmicro.2010.07.004 |
geographic |
Indian Pacific |
geographic_facet |
Indian Pacific |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
Johnstone, Heather J. H., Schulz, Michael, Barker, Stephen https://orca.cardiff.ac.uk/view/cardiffauthors/A015364W.html orcid:0000-0001-7870-6431 orcid:0000-0001-7870-6431 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) , pp. 58-70. 10.1016/j.marmicro.2010.07.004 https://doi.org/10.1016/j.marmicro.2010.07.004 doi: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 |
_version_ |
1766169761051312128 |