Szczegóły publikacji
Opis bibliograficzny
Middle Ordovician subduction of continental crust in the Scandinavian Caledonides: an example from Tjeliken, Seve Nappe Complex, Sweden / Kathrin Fassmer, Iwona Klonowska, Katarzyna WALCZAK, Barbro Andersson, Nikolaus Froitzheim, Jarosław MAJKA, Raúl O. C. Fonseca, Carsten Münker, Marian Janák, Martin Whitehouse // Contributions to Mineralogy and Petrology ; ISSN 0010-7999. — 2017 — vol. 172 iss. 11-12 art. no. 103, s. 1-21. — Bibliogr. s. 18–21, Abstr. — Publikacja dostępna online od: 2017-11-16. — J. Majka - dod. afiliacja: University of Uppsala
Autorzy (10)
- Fassmer Kathrin
- Klonowska Iwona
- AGHWalczak Katarzyna
- Andersson Barbro
- Froitzheim Nikolaus
- AGHMajka Jarosław
- Fonseca Raúl O. C.
- Münker Carsten
- Janák Marian
- Whitehouse Martin J.
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 111165 |
|---|---|
| Data dodania do BaDAP | 2018-01-10 |
| Tekst źródłowy | URL |
| DOI | 10.1007/s00410-017-1420-7 |
| Rok publikacji | 2017 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Contributions to Mineralogy and Petrology |
Abstract
The Seve Nappe Complex of the Scandinavian Caledonides is thought to be derived from the distal passive margin of Baltica which collided with Laurentia in the Scandian Phase of the Caledonian Orogeny at 430-400 Ma. Parts of the Seve Nappe Complex were affected by pre-Scandian high-and ultrahigh-pressure metamorphism, in a tectonic framework that is still unclear, partly due to uncertainties about the exact timing. Previous age determinations yielded between similar to 505 and similar to 446 Ma, with a general trend of older ages in the North (Norrbotten) than in the South (Jamtland). New age determinations were performed on eclogite and garnet-phengite gneiss at Tjeliken in northern Jamtland. Thermodynamic modelling yielded peak metamorphic conditions of 25-27 kbar/680-760 degrees C for the garnet-phengite gneiss, similar to published peak metamorphic conditions of the eclogite (25-26 kbar/650-700 degrees C). Metamorphic rims of zircons from the garnet-phengite gneiss were dated using secondary ion mass spectrometry and yielded a concordia age of 458.9 +/- 2.5 Ma. Lu-Hf garnet-whole rock dating yielded 458 +/- 1.0 Ma for the eclogite. Garnet in the eclogite shows prograde major-element zoning and concentration of Lu in the cores, indicating that this age is related to garnet growth during pressure increase, i.e. subduction. The identical ages from both rock types, coinciding with published Sm-Nd ages from the eclogite, confirm subduction of the Seve Nappe Complex in Northern Jamtland during the Middle Ordovician in a fast subduction-exhumation cycle.
