ST. PETERSBURG - Cristina Subt, a student of Dr. Brad Rosenheim, will receive a 2014 GSA Graduate Student Research Grant.
Her research project, "Chronology of Antarctic sediments during the last glaciation using ramped pyrolysis radiocarbon analyses," involves the investigation of the ramped pyrolysis (RP) dating method on a regional scale relative to available dating methods for Antarctic sediments. She will apply radiocarbon analysis using ramped pyrolysis, bulk AIO, as well as carbonates to Antarctic sediment samples from equal depths.
The purpose of this project is to understand the differences and relationships between the three dating methods and determine if the RP 14C dates are consistently closer to the carbonate ages, which could affect how dates are constrained for Antarctic sediments, where carbonates are usually quite rare. Improved timing constraints will be useful in constructing more accurate models of ice sheet advance and retreat during the LGM.