Laser microprobe ⁴⁰Ar–³⁹Ar analysis of pseudotachylyte and host‐rocks from the Tatra Mountains, Slovakia: evidence for late Palaeogene seismic/tectonic activity

Abstract

Laserprobe 40Ar–39Ar data from fault‐related pseudotachylytes and granitic host‐rocks from the Tatra Mountains (Central Western Carpathians) resolve the controversy over the age of propagation of the sub‐Tatra detachment fault. This major structure has resulted in exhumation of crystalline basement to the north‐west, and subsidence and sediment deposition in the Palaeogene Central Carpathians Basin to the south‐east. Host‐rock biotite ages range from 331 Ma to 322 Ma, and pseudotachylyte spot ages range from 164 Ma to 28 Ma. Of these, the youngest group identify the maximum timing of the early stages of Tatra Mountains uplift, which continued in the Miocene (20–10 Ma) and culminated during the Quaternary. The wide‐ranging older ages are an artefact of an unsupported 40Ar component that is most likely a combination of both inherited and excess argon.

Age and origin of fluorapatite-rich dyke from Baranec Mt. (Tatra Mts., Western Carpathians): a key to understanding of the post-orogenic processes and element mobility

“…: Gawęda et al 2016). The U-Pb apatite age, determined in this study fits well with the 40 Ar-39 Ar age range (330 -300 Ma) obtained for micas from the High Tatra granite (Kohút and Sherlock 2003). The U-Th-Pb ages of secondary monazite-(Ce) crystals from the Western Tatra Mountains, also cluster at ~ 330 Ma (Burda & Dzierżanowski 2005) and they are in agreement (within age uncertainties) of the U-Pb fluorapatite age of 328.6 ± 2.4 Ma.…”

The petrogenesis of granitoid rocks unusually rich in apatite in the Western Tatra Mts. (S-Poland, Western Carpathians)

“…Grey square indicates the location of the section shown in Fig. 2 The present structure of the Tatra Massif reflects brittle tectonics related to Paleogene uplift of the massif and its division into small tectonic blocks at 36-28 Ma and at 20-10 Ma as revealed by fission tracks and 40 Ar-39 Ar dating (Burchart 1972;Kohut and Sherlock 2003). In the Quaternary, the massif and its Alpine sedimentary cover was tilted to the north along the currently active Sub-Tatric Fault (Fig.…”

LA-ICP-MS U-Pb dating and REE patterns of apatite from the Tatra Mountains, Poland as a monitor of the regional tectonomagmatic activity

“…Post-magmatic extension and associated shearing resulted in the formation of localized shear zones and metamorphic fabrics in the magmatic rocks, resulted in 40 Ar/ 39 Ar biotite ages of c. 322-331 Ma interval (Kohut and Sherlock, 2003).…”