| Abstrakt: |
For determining the absolute age of the terrace deposits, a geomorphosite was selected, located on the left side of Someşul Mare River, southeast of Rebrişoara, which includes a fragment of the tread of the 3rd terrace (20 m relative altitude) and the cuesta slope, facing north, of the Făgetului Hills. Since the beginning of the 20th century, the question of the fluvial terraces age has been long debated in Romanian geomorphological literature. A large number of geomorphologists have carried out studies where the question of the age of the terraces both inside the Carpathian curvature and outside, was raised. Most of the studies carried out for the terraces on the rivers of the Transylvanian Basin indicated the age of the 3rd terrace as Wurmian (Brătescu, 1941; Dragoman, 1955; Posea, 1961; Fuchs and Konya, 1967; Jakab and Sipos, 1970). Moreover (Savu, Mac and Tudoran, 1970 states that the 3rd terrace was formed in the Middle Weichselian (Würm II). Until recently, most assumptions related to the age of the terraces were based on the correlation between them and/or by dating the paleontological fossils discovered in the terrace deposits. Recent studies, on the other hand, use highprecision methods to determine the ages of terrace formations. Researchers as: Bălescu, 2003, Necea et al., 2013, Armaş, 2018, use methods as the Infrared-stimulated luminescence dating (IRSL) and SAR-OSL (Optically Stimulated Luminescence). The present study focuses on the attempt to determine the age of the 3rd terrace in the corridor of the Someșul Mare River. In the alluvial formations of this terrace, two geologic drilling operations were carried out from where several samples were collected. They were subjected to OSL analysis at the Luminescence Dating Laboratory, Department of Geoinformatics, Physical and Environmental Geography, University of Szeged, Hungary. The results showed an older age of 3rd terrace than was believed until now. [ABSTRACT FROM AUTHOR] |
