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Seafloor Depth of George VI Sound, Antarctic Peninsula, From Inversion of Aerogravity Data
Author(s) -
Constantino Renata R.,
Tinto Kirsty J.,
Bell Robin E.,
Porter David F.,
Jordan Tom A.
Publication year - 2020
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2020gl088654
Subject(s) - geology , sound (geography) , ridge , oceanography , seafloor spreading , bathymetry , peninsula , circumpolar deep water , ice shelf , antarctic intermediate water , inversion (geology) , structural basin , sea ice , deep water , geomorphology , paleontology , north atlantic deep water , cryosphere , archaeology , history
George VI Sound is an ~600 km‐long curvilinear channel on the west coast of the southern Antarctic Peninsula separating Alexander Island from Palmer Land. The Sound is a geologically complex region presently covered by the George VI Ice Shelf. Here we model the bathymetry using aerogravity data. Our model is constrained by water depths from seismic measurements. We present a crustal density model for the region, propose a relocation for a major fault in the Sound, and reveal a dense body, ~200 km long, flanking the Palmer Land side. The southern half of the Sound consists of two distinct basins ~1,100 m deep, separated by a −650 m‐deep ridge. This constricting ridge presents a potential barrier to ocean circulation beneath the ice shelf and may account for observed differences in temperature‐salinity (T‐S) profiles.