| Autor: |
POTOČNÝ, TOMÁŠ, MÉRES, ŠTEFAN, PLAŠIENKA, DUŠAN |
| Předmět: |
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| Zdroj: |
Mineralia Slovaca; 2020, Vol. 52 Issue 2, p83-102, 20p |
| Abstrakt: |
The investigated area represents a segment of the contiguous Veporic-Gemeric zone characterized by the presence of several major superposed and/or juxtaposed tectonic units, exhibiting contrasting structural and metamorphic histories. Based on the structural, petrological and geochronological (EMPA dating of mona-zites) investigations, the principal Alpine tectono-metamorphic evolutionary stages were distinguished. Besides Variscan ages from the Veporic granitoids and skarnoids, the monazite dating provided evidence for the latest Jurassic-earliest Cretaceous event (150-140 Ma) in the Meliatic Bôrka Nappe, which was related to its exhumation and thrusting over the Gemeric units. Younger Cretaceous ages (110-85 Ma) were detected in all units involved and were connected with the ongoing shortening and onset of the orogen-parallel extensional exhumation of the Veporic metamorphic dome. Exhumation was governed by the kinematically linked sinistral shearing along the WSW-ENE trending Veporic-Gemeric contact zone (Lubeník and Hrádok fault zones) and by NNW-SSE oriented and east-dipping system of low-angle detachment normal faults that facilitated unroofing of the Veporic dome. Both segments reactivated in different ways the original overthrust contact between the Veporic lower plate and the Gemeric-Meliatic-Turnaic-Silicic upper plate. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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