Dataset: Iodine:calcium ratios in planktic foraminifera in the eastern Pacific through the last deglaciation determined from core MAZ-1E-04 collected on cruise MAZ-I aboard the R/V El Puma in April 2015

Please see Alcorn et al. (2026) for a more detailed methodology.

Core MAZ-1E-04 (MAZ-I E04G) was collected on the oceanographic cruise MAZ-I aboard the R/V "El Puma" on April 28, 2015 using a gravity corer.

Approximately 30 Neogloboquadrina dutertrei (urn:lsid:marinespecies.org:taxname:113473) individuals >300 µm (~1 mg) from each sample were cleaned and prepared following the clay removal and oxidative steps from Barker et al. (2003). This procedure has been successfully applied to I/Ca analyses (Winkelbauer et al., 2023). The samples were gently crushed between glass slides to open the tests and allow debris to escape during cleaning. Subsequent steps include ultrasonication in Milli-Q water, methanol, and hydrogen peroxide to remove clay and organic matter. Samples were then sent to Michigan State University and analyzed using the Thermo Scientific ICAP Q quadrupole Inductively Coupled Plasma Mass Spectrometer.