Szczegóły publikacji
Opis bibliograficzny
Ba- and Ti-enriched dark mica from the UHP metasediments of the Seve Nappe Complex, Swedish Caledonides / Jarosław MAJKA, Łukasz Kruszewski, Åke Rosén, Iwona Klonowska // Mineralogia / Mineralogical Society of Poland ; ISSN 1899-8291. — Tytuł poprz.: Mineralogia Polonica. — 2015 — vol. 46 no. 1–2, s. 41–50. — Bibliogr. s. 49–50, Abstr. — Publikacja dostępna online od: 2017-02-10. — J. Majka - pierwsza afiliacja: Uppsala University, Sweden
Autorzy (4)
- AGHMajka Jarosław
- Kruszewski Łukasz
- Rosén Åke
- Klonowska Iwona
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 104331 |
|---|---|
| Data dodania do BaDAP | 2017-03-10 |
| Tekst źródłowy | URL |
| DOI | 10.1515/mipo-2017-0001 |
| Rok publikacji | 2015 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Mineralogia |
Abstract
We report on the occurrence of peculiar Ba- and Ti-enriched dark mica in metasedimentary rocks that underwent high-pressure metamorphism in the diamond stability field followed by decompression to granulite facies conditions. The mica occurs as well-developed preserved laths in a quartzofeldspathic matrix. The mean concentrations of BaO and TiO2 in the mica are 11.54 and 7.80wt%, respectively. The maximum amounts of these components are 13.38wt% BaO and 8.45wt% TiO2. The mean crystallochemical formula can be expressed as (K0.54Ba0.39Na0.02Ca0.01)Σ0.96(Fe1.37Mg0.85Ti0.50Al0.29Mn0.01Cr0.01)Σ3.03(Si2.59Al1.41)Σ4.00O10(OH1.30O0.66F0.02S0.01)Σ1.99, with oxyannite, oxy-ferrokinoshitalite and siderophyllite as dominating end-members. Based on the petrographical observations, it is proposed that the dark mica was formed at a rather late stage in the evolution of the parental rock, i.e. under granulite facies conditions.
