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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2019
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| Online Access: | https://doi.org/10.1594/PANGAEA.907942 |
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| _version_ | 1867170474684841984 |
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| author | Iwasaki, Shinya Kimoto, Katsunori Okazaki, Yusuke Ikehara, Minoru |
| author_facet | Iwasaki, Shinya Kimoto, Katsunori Okazaki, Yusuke Ikehara, Minoru |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Evaluation of foraminiferal test dissolution in deep-sea sediments facilitates reconstruction of seawater chemistry. Here we observed test dissolution processes of the planktic foraminifera Trilobatus sacculifer, Globigerinoides ruber, and Neogloboquadrina dutertrei from mid-latitudes of the western North Pacific; in these three species, we tested the ability of a new dissolution index using data from X-ray micro-computed tomography scanning (XMCT). Although the dissolution process of foraminiferal tests differed slightly among species, dissolution of all species was equally assessed by the calcite density distribution (%Low-CT-number calcite volume) calculated from the CT number histogram. As for T. sacculifer and G. ruber, the test area density, a conventional proxy for assessing test condition based on weight measurement, is affected by variance in the thickness of the outermost chamber wall; thus, this conventional proxy can be affected by sea surface conditions during test calcification. In contrast, the relationship between the %Low-CT-number calcite volume of tests and the deep seawater calcite saturation state suggests that XMCT scanning is applicable for evaluating the intensity of foraminiferal test dissolution at the under-saturated deep seafloor in this area and is an invaluable proxy for detecting deep seawater carbonate ion concentration changes on glacial-interglacial timescales. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_907942 |
| institution | PANGAEA |
| language | en |
| publishDate | 2019 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | X-ray micro-CT scanning of tests of three planktic foraminiferal species to clarify dissolution process and progress Iwasaki, Shinya Kimoto, Katsunori Okazaki, Yusuke Ikehara, Minoru Carbonate; Dissolution; planktic foraminifera; X-ray micro-CT Evaluation of foraminiferal test dissolution in deep-sea sediments facilitates reconstruction of seawater chemistry. Here we observed test dissolution processes of the planktic foraminifera Trilobatus sacculifer, Globigerinoides ruber, and Neogloboquadrina dutertrei from mid-latitudes of the western North Pacific; in these three species, we tested the ability of a new dissolution index using data from X-ray micro-computed tomography scanning (XMCT). Although the dissolution process of foraminiferal tests differed slightly among species, dissolution of all species was equally assessed by the calcite density distribution (%Low-CT-number calcite volume) calculated from the CT number histogram. As for T. sacculifer and G. ruber, the test area density, a conventional proxy for assessing test condition based on weight measurement, is affected by variance in the thickness of the outermost chamber wall; thus, this conventional proxy can be affected by sea surface conditions during test calcification. In contrast, the relationship between the %Low-CT-number calcite volume of tests and the deep seawater calcite saturation state suggests that XMCT scanning is applicable for evaluating the intensity of foraminiferal test dissolution at the under-saturated deep seafloor in this area and is an invaluable proxy for detecting deep seawater carbonate ion concentration changes on glacial-interglacial timescales. |
| title | X-ray micro-CT scanning of tests of three planktic foraminiferal species to clarify dissolution process and progress |
| topic | Carbonate; Dissolution; planktic foraminifera; X-ray micro-CT |
| url | https://doi.org/10.1594/PANGAEA.907942 |