d13C values measured by Secondary Ion Mass Spectrometry in shells of the planktic foraminifer Morozovella allisonensis from the PETM section of ODP Site 865 (Central Pacific)


Foraminiferal shells of the species M. allisonensis from the PETM section of ODP Site 865, Central Pacific, were cast with 3 grains of UWC-3 calcite standard (Kozdon et al., 2009) in the center of a 25 mm round epoxy mount, ground to the level of best exposure, polished, cleaned, and Au-coated. Prior to geochemical analysis, shells were examined by Scanning Electron Microscopy (SEM) to identify subdomains suitable for in-situ d13C and Mg/Ca ratio measurements and to avoid diagenetically altered zones within each shell. In-situ d13C measurements were performed with ~7 µm beam spot size in the WiscSIMS Laboratory at UW-Madison by a CAMECA ims-1280 large radius multicollector ion microprobe) using the protocols described in a previous study (Kozdon et al., 2018). The in-situ d13C microanalyses primarily targeted subdomains located at the base of pustular outgrowths (muricae) along the chamber walls of each shell. Previous studies have shown that these subdomains are less susceptible to post-depositional alteration than the rest of the shell (Kozdon et al., 2011; Kozdon et al., 2013). Between one and five SIMS d13C microanalyses were performed for each shell. Reproducibility of the individual spot analysis of UWC-3 standard (d13C = -0.91‰ V-PDB, Kozdon et al., 2011) bracketing samples is on average 0.7‰ (± 2 SD).

DOI https://doi.org/10.1594/PANGAEA.967641
Related Identifier References https://doi.org/10.1029/2010PA002056
Related Identifier References https://doi.org/10.1002/palo.20048
Related Identifier References https://doi.org/10.1002/2017PA003314
Related Identifier References https://doi.org/10.1016/j.chemgeo.2008.10.032
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.967641
Creator Kozdon, Reinhard (ORCID: 0000-0001-6347-456X); Kelly, Daniel Clay
Publisher PANGAEA
Publication Year 2024
Funding Reference National Science Foundation https://doi.org/10.13039/100000001 Crossref Funder ID 1405224 https://www.nsf.gov/awardsearch/showAward?AWD_ID=1405224 Reconciling substrate specific differences in the carbon isotope excursion marking the Paleocene-Eocene thermal maximum; National Science Foundation https://doi.org/10.13039/100000001 Crossref Funder ID 2004618 https://www.nsf.gov/awardsearch/showAward?AWD_ID=1405524 Facility Support: The WiscSIMS National Ion Microprobe
Rights Creative Commons Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Resource Type Dataset
Format text/tab-separated-values
Size 35 data points
Discipline Earth System Research
Spatial Coverage (-179.555 LON, 18.440 LAT); North Pacific Ocean
Temporal Coverage Begin 1992-04-04T01:30:00Z
Temporal Coverage End 1992-04-04T14:15:00Z