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A large array of inselbergs on a continuation of the sub-Cambrian peneplain in the Baltic Basin : evidence from seismic data, Wes ern Lithuania

Grendaité Milda, Michelevičius Dainius, Radzevičius Sigitas

Geological Quarterly

2022

Vol. 66, No. 1

art. no. 2

The sub-Cambrian peneplain is well-known in Scandinavia, outcropping in Finland, Sweden and Norway. This peneplain is thought to have formed within the Baltic Sea region in Cryogenian and Ediacaran/early Cambrian time, when Baltica, a part of Rodinia for most of that time, experienced tectonic stability, strong sheet-wash weathering and glaciations. While the peneplain outcrops in the Baltic Shield region, it continues beneath Phanerozoic strata of the Baltic Basin. This buried part of the sub-Cambrian peneplain is known to have several isolated inselbergs. We interpret newly acquired 2D and 3D seismic data and show that the sub-Cambrian peneplain extends at least to Western Lithuania where the palaeotopography of the Precambrian basement changes its character from peneplain-like flat to hilly terrain with a large array of inselbergs. Even though some of the largest features of this palaeotopography have been known before, they are here demonstrated for the first time within the regional context of the sub-Cambrian peneplain.

The engineering geological and geotechnical conditions of Gediminas Hill (Vilnius, Lithuania) : an update

Skuodis Šarūnas, Michelevičius Dainius, Damušytė Aldona, Valivonis Jouzas, Medzvieckas Jurgis, Šneideris Arnoldas, Jokubaitis Aidas, Daugevičius Mykolas

Geological Quarterly

2021

Vol. 65, No. 3

art. no. 42

We provide an update of engineering geological and geotechnical conditions at Gediminas Hill in Vilnius (Lithuania) from 1955 till 2020, which allows evaluation of the stability of its slopes. Active geological processes are still observed on Gediminas Hill. The latest landslides appeared on March 22, 2004 and on March 8, 2008 on the eastern slope above the hiking trail, as well on February 11, 2016 and February 13, 2016 on the northern part of the slope. The latest landslide (involving ~40 m3 of soil) took place on March 7, 2017 between the eastern and southern slopes. Eight hydrogeological units were distinguished in 2017. During 2019-2020 many engineering geological and geotechnical investigations have allowed determination of the possibilities and methods of slope stabilization.