No 4-5 (2006): Ukrainian Antarctic Journal
Articles

Crustal inhomogeneities of Bransfield Strait (West Antarctica). New geophysical data

S. Levashov
Institute of the applied problems of Ecology, Geophysics and Geochemistry, Kyiv
I. Korchagin
S. I. Subbotin Institute of geophysics of NAS of Ukraine, Kyiv
Yu. Kozlenko
S. I. Subbotin Institute of geophysics of NAS of Ukraine, Kyiv
V. Solovyov
S. I. Subbotin Institute of geophysics of NAS of Ukraine, Kyiv
Published December 15, 2006

Abstract

The Ukrainian Antarctic expeditions provided new geophysical data for many West Antarctica bottom structures. Gravity, magnetic- and electromagnetic surveys near the Antarctic Peninsula enabled to specify the age of the formation of some blocks, separate local crustal inhomogeneities of Bransfield Strait and continental margin of Antarctica. The similar results obtained by three different methods assure the notable magmatic activity of Bransfield Trough that forms in the conditions of structural transformations and rifting processes migrating NE-SW war along Bransfield Strait. It is quite probable that this area is dominated by diffusion tension process but not by the expansion of a mid-oceanic ridge in a back of a volcanic arc.