Gravity models across the Transantarctic Mountain Front near New Harbour, McMurdo Sound, Antarctica

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Abstract
A Bouguer gravity map for the Transantarctic Mountains and McMurdo Sound, from Granite Harbour south to the Dailey Islands, reveals a short wavelength gravity anomaly near New Harbour, superimposed on the regional east-west gravity gradient. Gravity models of this anomaly associate it with baseme'nt rocks dipping eastwards just offshore beneath relatively lower density Cenozoic sediment infilling McMurdo Sound. Off the Bowers Piedmont Glacier, the dipping basement is interpreted as the eastern flank of a fault ridge striking subparallel to the coastline. This ridge and the adjacent fault-angle depressions are considered to be products of fault block rotation and collapse contemporaneous with subsidence of the Ross Sea and the rise of the Transantarctic Mountains.