Iwasaki, Shinya; Kimoto, Katsunori; Okazaki, Yusuke; Ikehara, Minoru (2019): X-ray micro-CT scanning of tests of three planktic foraminiferal species to clarify dissolution process and progress [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.907942, Supplement to: Iwasaki, Shinya; Kimoto, K; Okazaki, Y; Ikehara, M (2019): Micro‐CT Scanning of Tests of Three Planktic Foraminiferal Species to Clarify DissolutionProcess and Progress. Geochemistry, Geophysics, Geosystems, 20(12), 6051-6065, https://doi.org/10.1029/2019GC008456
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Published: 2019-10-29 • DOI registered: 2019-11-28
Abstract:
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.
Coverage:
Median Latitude: 30.968833 * Median Longitude: 135.810833 * South-bound Latitude: 29.216667 * West-bound Longitude: 133.466667 * North-bound Latitude: 33.770000 * East-bound Longitude: 138.700000
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
2 datasets
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Datasets listed in this publication series
- Iwasaki, S; Kimoto, K; Okazaki, Y et al. (2019): (Table 1) X-ray micro-CT scanning of planktic foraminiferal from sediment cores. https://doi.org/10.1594/PANGAEA.907939
- Iwasaki, S; Kimoto, K; Okazaki, Y et al. (2019): (Table 2) X-ray micro-CT scanning of planktic foraminiferal from sediment cores. https://doi.org/10.1594/PANGAEA.907941