Permian A-type rhyolites of the Muráň Nappe, Inner Western Carpathians, Slovakia: in-situ zircon U–Pb SIMS ages and tectonic setting

• Main Authors: Ondrejka Martin, Li Xian-Hua, Vojtko Rastislav, Putis Marian, Uher Pavel, Sobocký Tomas
• Format: Article
• Language: English
• Published: Earth Science Institute, Slovak Academy of Sciences, Slovakia 2018-04-01
• Series: Geologica Carpathica
• Subjects: Permian volcanism; Western Carpathians; Muráň Nappe; A-type rhyolites; zircon; SIMS U–Pb age
• Online Access: http://www.degruyter.com/view/j/geoca.2018.69.issue-2/geoca-2018-0011/geoca-2018-0011.xml?format=INT
• ISSN: 1336-8052

Three representative A-type rhyolitic rock samples from the Muráň Nappe of the inferred Silicic Unit of the Inner Western Carpathians (Slovakia) were dated using the high-precision SIMS U–Pb isotope technique on zircons. The geochronological data presented in this paper is the first in-situ isotopic dating of these volcanic rocks. Oscillatory zoned zircon crystals mostly revealed concordant Permian (Guadalupian) ages: 266.6 ± 2.4 Ma in Tisovec-Rejkovo (TIS-1), 263.3 ± 1.9 Ma in Telgárt-Gregová Hill (TEL-1) and 269.5 ± 1.8 Ma in Veľká Stožka-Dudlavka (SD-2) rhyolites. The results indicate that the formation of A-type rhyolites and their plutonic equivalents are connected to magmatic activity during the Permian extensional tectonics and most likely related to the Pangea supercontinent break-up.