Kozdon, Reinhard; Kelly, Daniel Clay (2024): Mg/Ca ratios measured by Electron Probe Microanalyzer in shells of the planktic foraminifer Morozovella velascoensis from ODP Site 865 (Central Pacific) across the PETM (~56 Ma) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.967579
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Published: 2024-05-03 • DOI registered: 2024-06-01
Abstract:
Foraminiferal shells of the species M. velascoensis from sediments spanning ~650 ka across the PETM section of ODP Site 865, Central Pacific, were embedded in epoxy and polished to midsection. Suitable, well-preserved domains for in-situ analysis were identified by scanning electron microscopy. In-situ measurements of the Mg/Ca ratios were performed using a CAMECA SX-51 electron microprobe housed in the Cameron and Wilcox Microbeam Laboratory at the UW-Madison Department of Geoscience. Depending on the number of suitable targets for analysis, between one and seven Mg/Ca measurements were performed for each shell. Fully quantitative microanalyses (mineral standards, background subtracted, and matrix corrected) were performed using Probe for EPMA software (Probe Software, Inc.). The natural carbonate standards Delight Dolomite and Callender Calcite were used for Mg and Ca, respectively. Mg-K alpha X-rays were measured on two spectrometers and aggregated. Carbon was calculated within the matrix correction, being allocated as one atom of carbon to 3 atoms of oxygen, and oxygen by stoichiometry to the cations measured, thus analytical totals of 98 – 100.5 wt. % are a measure of accuracy. Analyses featuring analytical totals below 98 wt. % or above 100.5 wt. % were excluded from the data set.
Related to:
Kozdon, Reinhard; Kelly, Daniel Clay (2024): Hot Tropical Temperatures During the Paleocene‐Eocene Thermal Maximum Revealed by Paired In Situ δ 13 C and Mg/Ca Measurements on Individual Planktic Foraminifer Shells. Paleoceanography and Paleoclimatology, 39(8), e2023PA004834, https://doi.org/10.1029/2023PA004834
Funding:
National Science Foundation (NSF), grant/award no. 1405224: Reconciling substrate specific differences in the carbon isotope excursion marking the Paleocene-Eocene thermal maximum
National Science Foundation (NSF), grant/award no. EAR-2004618: Facility Support: The WiscSIMS National Ion Microprobe
Coverage:
Latitude: 18.440400 * Longitude: -179.555000
Date/Time Start: 1992-04-04T01:30:00 * Date/Time End: 1992-04-04T14:15:00
Minimum DEPTH, sediment/rock: 100.50 m * Maximum DEPTH, sediment/rock: 105.00 m
Event(s):
143-865C * Latitude: 18.440400 * Longitude: -179.555000 * Date/Time Start: 1992-04-04T01:30:00 * Date/Time End: 1992-04-04T14:15:00 * Elevation: -1528.0 m * Penetration: 136.3 m * Recovery: 114.11 m * Location: North Pacific Ocean * Campaign: Leg143 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 15 cores; 136.3 m cored; 0 m drilled; 83.7 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Kozdon, Reinhard | |||
| 2 | Sample code/label | Sample label | Kozdon, Reinhard | DSDP/ODP/IODP sample designation | ||
| 3 | Hole | H | Kozdon, Reinhard | Hole/core | ||
| 4 | Section | Sect | Kozdon, Reinhard | |||
| 5 | Interval | Interval | Kozdon, Reinhard | cm | ||
| 6 | DEPTH, sediment/rock | Depth sed | m | Kozdon, Reinhard | Geocode – mbsf | |
| 7 | Identification | ID | Kozdon, Reinhard | Shell # | ||
| 8 | Size fraction | Size fraction | Kozdon, Reinhard | µm | ||
| 9 | Morozovella velascoensis, Magnesium/Calcium ratio | M. velascoensis Mg/Ca | mmol/mol | Kozdon, Reinhard | Electron microprobe, CAMECA, SX-51 |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
371 data points