Age estimation of tectonically exposed surfaces using cation-ratio dating of rock varnish

Abstract

Cation-ratio dating (RCD) is a non-destructive and rapid means of dating rock varnish. This study explored that use of rock varnish RCD as a means of aging tectonically exposed surfaces in a semi-arid region of northwestern Greece with varying degrees of tectonic activity. Tectonic structures in the study region were identified and aged using conventional dating techniques, and faults were classified as active, potentially active, or inactive. A stringent field sampling methodology was adopted which successfully determined the concentrations of calcium, potassium, and titanium cations in rock varnish on the exposed surfaces of these faults. Results showed that RCD was a valuable tool for dating tectonic structures, and could be used to determine their activation age. The rapidly obtained results of this study could be used to expedite the identification of active and potentially active faults. Furthermore, these findings would contribute to neotectonic mapping efforts and other studies that relate to the tectonics of a specific area. The RCD method was less destructive and more accurate compared to alternative numerical dating methods and was a rapid means of identifying tectonically active faults. It has the potential to be employed in managing future disasters and mitigating serious economic repercussions from tectonic activity.