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Spectroscopic characterization and thermal recrystallization study of an unknown metamict phase from Tuften Quarry, Southern Norway

Dariusz Malczewski, Maria Dziurowicz, Tomasz Krzykawski and Agnieszka Grabias
Spectroscopic characterization and thermal recrystallization study of an unknown metamict phase from Tuften Quarry, Southern Norway (in A tribute to Milan Novak, Radek Skoda (editor), Pietro Vignola (editor), Axel Mueller (editor) and Lee A. Groat (editor))
The Canadian Mineralogist (July 2018) 56 (4): 365-373

Abstract

This paper presents the results of (super 57) Fe Mossbauer spectroscopy, SEM-EDS analysis, gamma-ray spectrometry, and X-ray diffraction (XRD) patterns for an unknown metamict phase (UMP) from a syenite pegmatite at Tuften quarry, southern Norway. The sample exhibits (super 232) Th and (super 238) U activities of 137 and 2.6 Bq g (super -1) , respectively, and a calculated total absorbed alpha -dose of 8X10 (super 15) alpha -decay mg (super -1) . Its chemical composition falls generally between chevkinite-(Ce)-perrierite-(Ce) and allanite-(Ce)-ferriallanite-(Ce) mineral compositions. The Mossbauer spectrum of an untreated UMP sample can be fitted to two Fe (super 2+) and Fe (super 3+) quadrupole doublets assigned to octahedral coordination with a relative Fe (super 2+) /Sigma Fe ratio of 0.11. A sample of the UMP was also annealed in argon for one hour at 1273 K. Powder of the completely recrystallized sample was subjected to XRD analysis and indexed to the P121 space group with unit-cell dimensions of a 8.179 Aa, b 14.16 Aa, c 4.291 Aa, and beta = 96.71 degrees . The corresponding Mossbauer spectrum is characterized by the presence of three quadrupole doublets also assigned to Fe (super 2+) and Fe (super 3+) in octahedral coordination with a relative Fe (super 2+) /Sigma Fe ratio of 0.15. One of the Fe (super 3+) doublets shows extremely high quadrupole splitting of 2.60 mm s (super -1) , implying extreme distortion of the coordination octahedra.


ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 56
Serial Issue: 4
Title: Spectroscopic characterization and thermal recrystallization study of an unknown metamict phase from Tuften Quarry, Southern Norway
Title: A tribute to Milan Novak
Author(s): Malczewski, DariuszDziurowicz, MariaKrzykawski, TomaszGrabias, Agnieszka
Author(s): Skoda, Radekeditor
Author(s): Vignola, Pietroeditor
Author(s): Mueller, Axeleditor
Author(s): Groat, Lee A.editor
Affiliation: University of Silesia, Faculty of Earth Sciences, Poland
Pages: 365-373
Published: 201807
Text Language: English
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
Meeting name: PEG2017; 8th international symposium on Granitic pegmatites
Meeting location: Kristiansand, NOR, Norway
Meeting date: 20170613June 13-15, 2017
References: 34
Accession Number: 2019-003873
Categories: Mineralogy of silicatesIgneous and metamorphic petrology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
N59°02'20" - N59°02'20", E09°51'21" - E09°51'21"
Secondary Affiliation: Institute of Electronic Materials Technology, POL, Poland
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, copyright, Mineralogical Association of Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201902
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