Dataset: Radiocarbon measurements from planktic and benthic foraminifera in the eastern Pacific during 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.

In addition to the samples used for our age model, mainly Trilobatus sacculifer (urn:lsid:marinespecies.org:taxname:1026286) (supplemented by Neogloboquadrina dutertrei (urn:lsid:marinespecies.org:taxname:113473), Globigerinoides ruber (urn:lsid:marinespecies.org:taxname:113444), and Globigerina bulloides (urn:lsid:marinespecies.org:taxname:113434) when necessary) and benthic species Uvigerina (urn:lsid:marinespecies.org:taxname:112281) spp. were picked from 4 depths (37.5, 52.5, 65.5, 85.5 cm) from the >150 µm size fractionation. Two batches of mixed planktic foraminifera from the >150 µm size fraction were sent to the National Ocean Sciences Accelerator Mass Spectrometry Facility (NOSAMS) for analysis. A third batch of planktic foraminifera was analyzed at the Alfred Wegener Institute using their Mini Carbon Dating System. Additional benthic samples (mixed benthic species and Uvigerina spp.) from 5 depths were analyzed at the Keck Carbon Cycle Accelerator Mass Spectrometer Facility at the University of California. Ventilation ages were calculated using the difference between benthic 14C ages and MRA-corrected planktic foraminifera ages that should represent the atmospheric age. 

Planktic 14C ages were corrected to atmospheric 14C ages by subtracting Marine Reservoir Ages (MRAs) from the planktic ages. The MRA corrections are reported from previous literature close to our core (Butzin et al., 2020). The MRA-corrected planktic 14C ages were then calibrated against the IntCal20 curve using the Bchron software package (Haslett & Parnell, 2008). Midpoints of the 13 calibrated planktic 14C ages were used to create this core’s age-depth model using Bchron’s Bchronology function.