Geophysical Journal | 2002 volume 24 6

Petrophysical characteristics of rocks of the western coast of Antarctic Peninsula and adjacent isles in the area of the station "Academic Vernadsky"

© T.S. Lebedev, S.I. Shepel, V.A. Korchin, P.A. Burtny, B.Y. Savenko, V.I. Shapoval, E.E. Karnaukhova

For the first time a unique information on elastic, density, electrical, magnetic and thermal properties as well as some features of the mineral composition of rocks of the western part of the Antarctic Peninsula and the adjacent isles has been obtained and summarized. The experimental samples were taken in the area of the Ukrainian Antarctic Station "Academic Vernadskyi" during wintering in 1997-1998. The petrophysical experiments were mainly made at atmospheric pressure and room temperature in laboratories of the Earth's substance Physical Properties Department of the Institute of Geophysics NAS of Ukraine (Kiev). The studies of elastic and density parameters of rocks detected some regional rules of their distribution. Relatively low elastic wave velocity and comparatively high mineral formation density values are noted. This may be due to the specifics of the genesis of rocks of the sixth continent. A definite differentiation of rocks by their electrical properties has been established. In dry state mineral formations of a vein complex appeared to be most resistant. The decrease of the specific electrical resistance of granitoids compared to that of their typical representatives in other continents has been detected. The latter may be due to their high fluid content. It is shown that among the studied samples of our antarctic collections rocks with low magnetic susceptibility and natural remanent magnetization prevail. The mean thermal conductivity coefficient is the same for most rocks studied (2,00-2,26 m-1 -1). An exception are granites of the intrusive and vein complexes (=2,56-2,58) as well as their effective analogues - liparites (=2,57 m)-1) -1).

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