Tracing the Initiation of the Tribeč Mountain Exhumation by Laser-Probe ⁴⁰Ar/³⁹Ar Dating of Seismogenic Pseudotachylytes (Western Carpathians, Slovakia)

Kohút, Milan and Sherlock, Sarah C. (2016). Tracing the Initiation of the Tribeč Mountain Exhumation by Laser-Probe ⁴⁰Ar/³⁹Ar Dating of Seismogenic Pseudotachylytes (Western Carpathians, Slovakia). Journal of Geology, 124(2) pp. 255–265.

DOI: https://doi.org/10.1086/684443

Abstract

The seismogenic pseudotachylytes from the Tribeč Mountains (Western Carpathians, Slovakia) were dated by means of the laser microprobe ⁴⁰Ar/³⁹Ar method. The Tribeč Mountain crystalline basement was buried to 5–7.5-km depths, where it experienced approximately >110°C and <210°C thermal conditions. The dated pseudotachylytes have spot ages between 58 ± 1 and 46 ± 1 Ma with a weighted mean age of 49.7 ± 1.3 Ma, indicating that seismic activity caused their origin, the propagation of subvertical basement marginal faults, and/or the inception of basement unroofing processes in the southern part of the Central Carpathian Paleogene Basin. The extensional tectonics were responsible for the exhumation of basement highs and the opening of the intramontane depressions on the northwest margin of the Pannonian Basin.

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