Ukrainian Antarctic journal

No 10-11 (2012): Ukrainian Antarctic Journal
Articles

On the geodynamic of the tectonics of Drake Passage and Scotia Sea, Southern Ocean

G. B. Udintsev
Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academу of Sciences, Moscow
A. F. Beresnev
Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academу of Sciences, Moscow
A. V. Koltsova
Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academу of Sciences, Moscow
L. G. Domoratskaya
Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academу of Sciences, Moscow
H. W. Schenke
Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremen
N. Ott
Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremen
A. Bayer
Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremen
V. G. Bakhmutov
Institute of Geophysics of National Academy of Science of Ukraine, Kyiv
V. D. Solovyov
Institute of Geophysics of National Academy of Science of Ukraine, Kyiv
Keywords
  • Drake Passage,
  • Scotia Sea,
  • crustal structure,
  • ocean plates,
  • geophysical data

Abstract

Analyses of the results of complexes investigations  in Drake Passage and Scotia Sea region are reveal the presence of the major fragments of destructive intercontinental bridge between South America and West Antarctica which undergo  the cracking and local spreading. The dynamics of its development was determined as a result of a hot upper mantle substance (mantle plume) due to the moderate spreading between South America and Western Antarctic blocks. It was accompanied by regional plateau-basalts (ocean type) and local basalts (MORB type) magmatism  in the young local rifts. There are some evidences of continental blocks crushing and crustal blocks breaking in Drake Passage as well as progressive successive submergence of such blocks in Scotia Sea.