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First Permian–Early Triassic zircon ages for tin‐bearing granites from the Gemeric unit (Western Carpathians, Slovakia): connection to the post‐collisional extension of the Variscan orogen and S‐type granite magmatism
Author(s) -
Poller Ulrike,
Uher Pavel,
Broska Igor,
Plasienka Dusan,
Janák Marian
Publication year - 2002
Publication title -
terra nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.353
H-Index - 89
eISSN - 1365-3121
pISSN - 0954-4879
DOI - 10.1046/j.1365-3121.2002.00385.x
Subject(s) - geology , zircon , geochemistry , partial melting , permian , metamorphism , crust , orogeny , continental crust , anatexis , magmatism , early triassic , petrology , paleontology , tectonics , structural basin
This study presents the first preliminary U–Pb zircon data on tin‐bearing S‐type granites from the Gemeric unit of the Western Carpathians (Slovakia). U–Pb single zircon dating controlled by cathodoluminescence suggests crystallization of the Gemeric granites during Permian to Early Triassic (303–241 Ma) time. Post‐crystallization, low‐temperature metamorphic overprint is reflected by partial Pb loss in zircons. These Gemeric granites are younger than the highly fractionated, S‐type, tin‐ and rare‐element‐bearing leucogranites in the European Variscides. They may have resulted from partial melting, triggered by increased heat flow from the mantle below the continental crust, and most probably intruded during the post‐collisional extension and initial rifting of the Variscan orogenic belt. During Alpine orogeny, the Gemeric granites were affected by a low‐temperature deformation and metamorphism.