UNDERSTANDING ANTARCTIC TILL PROVENANCE THROUGH POWDER X-RAY DIFFRACTION
One sample from each of six moraines along Reedy Glacier was analyzed, with the addition of 3 sub-site samples from Strickland Nunatak, located at the head of the glacier. An additional 11 samples from ice stream cores were analyzed. These sample locations were chosen to investigate the variability between the Reedy Glacier, draining the East Antarctic Ice Sheet, and ice stream samples from West Antarctica, whilst providing constraints for ice stream positions in the Ross Embayment during the LGM.
Many similarities were found when comparing the < 2mm fraction with existing coarse sand petrology data. For example, the Strickland Nunatak samples were classified as quartzite using sand petrology. RockJock found abundant quartz, ranging from 42.3% to 53.5%, but also provided greater detail with respect to other minerals. For example, RockJock identified multiple feldspars (oligoclase, andesine, and albite), which were missed in the sand fraction and identified kaolin minerals. Further analyses will reveal whether consistent differences can be identified between these East and West Antarctic tills.