Ba- and Ti-enriched dark mica from the UHP metasediments of the Seve Nappe Complex, Swedish Caledonides

• Autorzy: Majka J. , Kruszewski Ł. , Rosen A. , Klonowska I.

Identyfikatory

DOI

10.1515/mipo-2017-0001

• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

oxyannite; oxy-ferrokinoshitalite; calcic gneiss; Scandinavian Caledonides

• Wydawca: Mineralogical Society of Poland
• Czasopismo: Mineralogia
• Rocznik: 2015
• Tom: Vol. 46, iss. 1/2
• Strony: 41--50
• Opis fizyczny: Bibliogr. 36 poz., rys., tab., wykr.

Twórcy

autor

Majka J.

• Uppsala University, CEMPEG – Department of Earth Sciences, Villavägen 16, SE – 752 36 Uppsala, Sweden
• AGH – University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection, al. Mickiewicza 30, 30-059 Kraków, Poland

autor

Kruszewski Ł.

• Polish Academy of Sciences, Institute of Geological Sciences, ul. Twarda 51/55, 00-818 Warszawa, Poland

autor

Rosen A.

• University of Bern, Institute of Geological Sciences, Baltzerstrasse 1+3, CH-3012 Bern, Switzerland

autor

Klonowska I.

• Uppsala University, CEMPEG – Department of Earth Sciences, Villavägen 16, SE – 752 36 Uppsala, Sweden

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