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Palaeomagnetism of Lithuanian Upper Pleistocene sediments

Gaigalas A., Abrahamsen N., Kazakauskas V., Melešyte M.

Geochronometria

2002

Vol. 21

65-72

In the Lithuania, a palaeomagnetic study of Upper Pleistocene and Late Glacial sediments at five sections has been carried out. The palaeomagnetic study of the varved clays in the Maskauka, Didžiasalis and Girininkai sections cover the time interval since 18,000 to 14,000 BP and Mančiagire section covers the time interval since 12,700 to 11,630 BP. The palaeomagnetic research of the Merkine (= Eemian) Interglacial sediments (Netiesos section) cover the time interval since 112.0š25 to 101.5š11.5 ka BP. The declination (D), inclination (I) and intensity (J) of the natural remanent magnetization of glaciolacustrine clays (Maskauka, Didžiasalis and Girininkai sections), as well as Merkine (=Eemian) Interglacial deposits (Netiesos section) and interstadial sediments (Mančiagire section) were measured. The result of these studies is presented in diagrams. The study reveals that considerable palaeomagnetic information can be obtained from the varved clays.

Reconnaissance electromagnetic soundings on Bornholm

Jankowski J., Ernst T., Jóźwiak W., Lewandowski M., Abrahamsen N., Semenov V.

Acta Geophysica Polonica

2001

Vol. 49, nr 3

361-372

Two electromagnetic (magnetotelluric and geomagnetic) soundings have been made in the region of Bornholm Island (Denmark). The results of analysis suggest a very complicated, locally three-dimensional character of the conductivity distribution; however, we interpret the outcome of the soundings in terms of a two-dimensional model, additionally using other published results from the region under study. From the interpretation it follows that Bornholm belongs to the East European Platform, whereas from the south and from the west an influence of large sedimentary basins appears. The depth of the sedimentary basin adjoining the island to the south is probably much deeper than estimated so far. Also, geological structures at greater depth in this region of the Baltic Sea may be much more complicated than it could be assumed from a simple extrapolation of data obtained from the surface geology.