Structural meaning of the Sava folds


  • Ladislav Placer



The Sava folds are situated in the triangle between the W-E striking Periadriatic tectonic zone, the NW-SE Idrija tectonic zone, and the WSW-ENE Mid-Hungarian tectonic zone. The forming of folds is associated with shaping of the intersecting area between two important tectonic zones called the Idrija - Mid-Hungarian trans-section zone which is characterized by a typical parquet structure and by an absence of dominant direction of shear displacements. In this way in the triangular segment between the Idrija and Mid-Hungarian tectonic zones called by us the Sava compressive wedge a field of N-S directed increased normal tensions was formed that resulted into the folding of the W-E oriented Sava folds. Owing to folding the compressive wedge shortened in the N-S direction for about 20 km which led to the shift of the Periadriatic tectonic zone to the south, and to its narrowing. The beginning of intense folding of Sava folds could not be more precisely determined as being younger than Miocene, or presumingly Pliocene. The compression is associated with folding and uplift of the compressive wedge and the forming of the antecedent valley of the Sava river between the Ljubljana and Krško basins. This means the process of compression was at work also in the Quaternary, and could be hypothetically active even at present.


How to Cite

Placer, L. (1998). Structural meaning of the Sava folds . Geologija, 41(1), 191–221.