Szczegóły publikacji
Opis bibliograficzny
Combined garnet and zircon geochronology of the ultra-high temperature metamorphism: Constraints on the rise of the Orlica-Śnieżnik Dome, NE Bohemian Massif, SW Poland / Katarzyna WALCZAK, Robert Anczkiewicz, Jacek Szczepański, Daniela Rubatto, Jan Košler // Lithos ; ISSN 0024-4937. — 2017 — vol. 292–293, s. 388–400. — Bibliogr. s. 399–400, Abstr. — Publikacja dostępna online od: 2017-09-28. — K. Walczak - dod. afiliacja: Polish Academy of Sciences, Kraków Research Centre
Autorzy (5)
- AGHWalczak Katarzyna
- Anczkiewicz Robert
- Szczepański Jacek
- Rubatto Daniela
- Košler Jan
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 112842 |
|---|---|
| Data dodania do BaDAP | 2018-03-26 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.lithos.2017.09.013 |
| Rok publikacji | 2017 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Lithos |
Abstract
Garnet and zircon geochronology combined with trace element partitioning and petrological studies provide tight constraints on evolution of the UHT-(U)HP terrain of the Orlica-snieznik Dome (OSD) in the NE Bohemian massif. Lu-Hf dating of peritectic garnet from two mesocratic granulites constrained the time of its initial growth at 346.9 +/- 12 and 3483 +/- 2.0 Ma recording peak 2.5 GPa pressure and 950 degrees C temperature. In situ, U-Pb SHRIMP dating of zircon from the same granulite gave a younger age of 341.9 +/- 3.4 Ma. Ti-in-zircon thermometry indicates crystallization at 810-860 degrees C pointing to zircon formation on the retrograde path. Lu partitioning between garnet rim and zircon suggest equilibrium growth and thus U-Pb zircon age constrain the terminal phase of garnet crystallization which lasted about 6 Ma. All Sm-Nd garnet ages obtained for mesocratic and mafic granulites are identical and consistently younger than the corresponding Lu-Hf dates. They are interpreted as reflecting cooling of granulites through the Sm-Nd closure temperature at about 337 Ma. The estimated PTt path documents the ca. 10 Ma evolution cycle of the OSD characterized by two distinct periods: (1) 347 - >342 Ma period corresponds to nearly isothermal decompression resulting from crustal scale folding and vertical extrusion of granulites, and (2) at >342-337 Ma which corresponds to a fast, nearly isobaric cooling.
