Ukrainian Antarctic journal

No 4-5 (2006): Ukrainian Antarctic Journal

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


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.


  1. Barker, D.H.N., & Austin, J.A. (1998). Rift propagation, detachment faulting and associated magnetism in Bransfield Strait, Antarctic Peninsula. Journal of Geophysical Research, 103(B10), 24017–24043.
  2. Barker, P.F., & Lawver, L.A. (1988). South American-Antarctic plate motion over the past 50 Myr, and the evolution of the South American-Antarctic Ridge. Geophysical Journal, 94, 377–386.
  3. Larter, R.D., & Barker, P.F. (1991). Effects of Ridge Crest-Trench Interaction on Antarctic-Phoenix Spreading: Forces on a Young Subducting Plate. Journal of Geophysical Research, 96(B12), 19583–19607.
  4. Ashcroft, W.A. (1972). Crustal structure of the South Shetland Islands and the Bransfield Strait. British Antarctic Survey Scientific Reports, 66, 1–43.
  5. Grad, M., Gutterch, A., & Janik, T. (1993). Seismic structure of the lithosphere across the zone of subduced Drake Plate under the Antarctic Plate, West Antarctica. Geophys. J.Int., 115, 568–600.
  6. Levashov, S.P., Yakymchuk, M.A., Korchahin, I.M., & Pishchanyi, Yu.M. (2003). Metod elektrorezonansnoho zonduvannia ta yoho mozhlyvosti pry provedenni kompleksnykh heoloho-heofizychnykh doslidzhen. [The method of electroresonance sounding and its possibilities in conducting complex geological and geophysical research]. Heoinformatyka, 1, 15–20.
  7. Veit, A. (2002). Volcanology and geochemistry of Pliocene to Recent volcanics on both sides of the Bransfield Strait (West Antarctica).
  8. Lodolo, E., Coren, F., Shreider, A., & Ceccone, G. Geophysical Evidense of a Relict Oceanic Crust in the Southwestern Scotia Sea. Marine Geophysical Research, 19, 439–450.
  9. Bakhmutov, V. G., Kozlenko, Yu. V., Korchagin, I. N. et al. (2001). Geofizicheskie issledovaniya v ukrainskix morskix antarkticheskix e`kspediciyax (pomaterialam 60-goi 61-gorejsovNIS «E`rnst Krenkel`»). [Geophysical research in Ukrainian Antarctic marine expeditions (based on the materials of the 60th and 61st cruises of the R / V Ernst Krenkel)]. Kyiv: In-t geofiziki NAN Ukrainy`, 323, Dep. v GNTB Ukrainy` 9.04.2001. № 70-Uk2001.
  10. Starostenko, V. I., Gross, S. S., Kobolev, V. P. et al. (2003). Novy`e texnologii pri provedenii gidromagnitny`x issledovanij v morskix akvatoriyax: metodika izmerenij, algoritmy` obrabotki, prakticheskie rezul`taty`. [New technologies in carrying out hydromagnetic research in marine areas: measurement technique, processing algorithms, practical results]. Geophysical journal, 25(2), 70–89.