Using diamict and glacio-tectonised samples to determine previous glacial overriding in the Allan Hills nunatak

The Sirius Group is an ancient glacial deposit that crops out at high elevations throughout the Transantarctic Mountains (TAM). Sirius diamicts (50) were sampled for analysis using the micromorphology technique to understand the character and regime of the Sirius glaciations.

A bulk texture analysis samples was also taken in concert with every micromorphology sample. The samples came from 40 different sites, all of which were triangulated, photographed and given a context description. The description and quantification of glacio-tectonised bedrock from a recent (non-Sirius) advance of the local Manhaul Glacier was conducted and a diamict associated with these glacio-tectonised bedrock features was collected for micromorphology (and bulk texture) analysis so to provide an in situ investigation of the only non-Sirius diamict found in the Allan Hills.