The Telšiai Deformation Zone (TDZ) is a considerable Precambrian deformation zone
in the crystalline basement of West Lithuania. The TDZ is up to 15 km wide. It is identified by drilling at a distance of about 100 km from the Baltic Sea shore to the east and by geophysical methods recognised at a distance of a few hundred kilometres. It is mirrored by a belt of gravimagnetic lows. The crystalline basement along the TDZ is composed mainly by Palaeoproterozoic intrusive charnockitoids transformed into predominant mylonites, and subordinated cataclasites. Petrological data, granitic veins, cutting mylonites and a preliminary comparison with similar deformation zones in Sweden (Linköping-Loftahammar, Hasela etc.) suggest that the formation of TDZ as a ductile shear zone presumably started during the Svekofennian orogenic period (around 1800 Ma) and was reactivated several times in brittle conditions of the Proterozoic and Phanerozoic. The Telšiai fault, the longest tectonic feature in the Phanerozoic sedimentary cover, was formed in the Devonian time.

Issues:

2011 - Vol.53
No. 1, No. 2, No. 3

2010 - Vol.52
No. 1-4

2009 - Vol.51
No. 1-2, No. 3-4

2008 - Vol.50
No. 1, No. 2, No. 3, No. 4, No. Priedas

2007
No. 1, No. 2, No. 3, No. 4

2006
No. 1, No. 2, No. 3, No. 4

2005
No. 1, No. 2, No. 3, No. 4

2004
No. 1, No. 2, No. 3, No. 4

2003
No. 1, No. 2, No. 3, No. 4

2002
No. 1, No. 2, No. 3, No. 4

2001
No. 1, No. 2, No. 3, No. 4