Yu. V. Kozlenko, M. V. Kozlenko. DETERMINATION OF THE TIMING OF THE FORMING THE BRANSFIELD STRAIGHT (WESTERN ANTARCTICA) FROM GPR OBSERVATIONS

Yu. V. Kozlenko, M. V. Kozlenko
Institute of Geophysics of NAS of Ukraine, Kyiv
DETERMINATION OF THE TIMING OF  THE FORMING THE BRANSFIELD STRAIGHT (WESTERN ANTARCTICA) FROM GPR OBSERVATIONS 
Applying GPSmonitoring data it's calculated that the Bransfield Strait forming as a rift structure may have been start within the interval 26—37 Ma last ago, i.e. the Late Paleogene — Early Neogene. Trough valley border displacement vectors analysis relatively to rift axis allowed to precise the term of the Strait forming — 28.4 Ma. (N1a Neogene Aquitanian age). 
Ris. 1. Batimetricheskaya karta rajona issledovanij. Punktirnoj liniej oboznachen sredin nyj hrebet 
Ris. 2. Sejsmicheskie modeli po profilyam GSZ: a — № 3, b — № 17 po [Janik, 1997]. Znacheniya Vr v km/s 
Ris. 3. Sovmeshchenie bortov troga Bransfild. Sushchestvuyushchee polozhenie: 1 — beregovoj li nii; 2 — brovki shel'fa. Smeshchennoe polozhenie: 3 — beregovoj linii; 4 — brovki shel'fa. 5 — predpolagaemaya liniya raskola troga; 6 — vektory otnositel'nogo peremeshcheniya na punk tah GPSnablyudenij v rajone antarkticheskih stancij: A — Artigas, D — Dzhubani, P — Ka pitan Arturo Prat, U — Grejt Uoll; 7 — smeshchenie stancij 
Ris. 4. Opredelenie vremeni obrazovaniya proliva Bransfild putem rascheta raskhozhdeniya protivopolozhnyh bortov troga. 1 — beregovaya liniya sovremennaya; 2 — brovka shel'fa sovre mennaya; 3 — beregovaya liniya peremeshchennaya; 4 — brovka shel'fa peremeshchennaya; 5 — liniya riftovogo raskola sovremennaya; 6 — liniya riftovogo raskola pervonachal'naya; 7 — vektory obshchego peremeshcheniya So otdel'nyh tochek v hode ehvolyucii; 8 — vektory riftinga Sri; 9 — vektory rotacionnogo dvizheniya Sro 
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