Szczegóły publikacji
Opis bibliograficzny
Zircon and monazite reveal late Cambrian/early Ordovician partial melting of the Central Seve Nappe Complex, Scandinavian Caledonides / Christopher J. Barnes, Michał Bukała, Riccardo CALLEGARI, Katarzyna WALCZAK, Ellen Kooijman, Melanie Kielman-Schmitt, Jarosław MAJKA // Contributions to Mineralogy and Petrology ; ISSN 0010-7999. — 2022 — vol. 177 iss. 9 art. no. 92, s. 1–23. — Bibliogr. s. 20–23, Abstr. — Publikacja dostępna online od: 2022-09-14. — R. Callegari, J. Majka - dod. afiliacja: Department of Earth Sciences, Uppsala University, Uppsala, Sweden
Autorzy (7)
- Barnes Christopher
- Bukała Michał
- AGHCallegari Riccardo
- AGHWalczak Katarzyna
- Kooijman Ellen
- Kielman-Schmitt Melanie
- AGHMajka Jarosław
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 142215 |
|---|---|
| Data dodania do BaDAP | 2022-09-20 |
| Tekst źródłowy | URL |
| DOI | 10.1007/s00410-022-01958-x |
| Rok publikacji | 2022 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Contributions to Mineralogy and Petrology |
Abstract
The Seve Nappe Complex (SNC) comprises continental rocks of Baltica that were subducted and exhumed during the Caledonian orogeny prior to collision with Laurentia. The tectonic history of the central SNC is investigated by applying in-situ zircon and monazite (Th-)U–Pb geochronology and trace element analysis to (ultra-)high pressure (UHP) paragneisses in the Avardo and Marsfjället gneisses. Zircons in the Avardo Gneiss exposed at Sippmikk creek exhibit xenocrystic cores with metamorphic rims. Cores show typical igneous REE profiles and were affected by partial Pb-loss. The rims have flat HREE profiles and are interpreted to have crystallized at 482.5 ± 3.7 Ma during biotite-dehydration melting and peritectic garnet growth. Monazites in the paragneiss are chemically homogeneous and record metamorphism at 420.6 ± 2.0 Ma. In the Marsfjället Gneiss exposed near Kittelfjäll, monazites exhibit complex zoning with cores enveloped by mantles and rims. The cores are interpreted to have crystallized at 481.6 ± 2.1 Ma, possibly during garnet resorption. The mantles and rims provide a dispersion of dates and are interpreted to have formed by melt-driven dissolution-reprecipitation of pre-existing monazites until 463.1 ± 1.8 Ma. Depletion of Y, HREE, and U in the mantles and rims compared to the cores record peritectic garnet and zircon growth. Altogether, the Avardo and Marsfjället gneisses show evidence of late Cambrian/early Ordovician partial melting (possibly in (U)HP conditions), Middle Ordovician (U)HP metamorphism, and late Silurian tectonism. These results indicate that the SNC underwent south-to-north oblique subduction in late Cambrian time, followed by progressive north-to-south exhumation to crustal levels prior to late Silurian continental collision.
