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CO (sub 2) in minerals of the cancrinite-sodalite group; pitiglianoite

Giancarlo Della Ventura, Fabio Bellatreccia and Elena Bonaccorsi
CO (sub 2) in minerals of the cancrinite-sodalite group; pitiglianoite (in Micro- and mesoporous mineral phases, S. Merlino (editor))
European Journal of Mineralogy (December 2005) 17 (6): 847-851

Abstract

This paper presents spectroscopic evidence for the presence of CO (sub 2) molecules within the structural channels of a member of the cancrinite-sodalite group of feldspathoids. The study was carried out using single-crystal micro-FTIR spectroscopy on a sample of pitiglianoite from Monte Cavalluccio (Bonaccorsi & Orlandi, 1996). A sharp and prominent band is observed in the medium-infrared range at 2351 cm (super -1) , which can be assigned to carbon dioxide molecules in the studied sample. Polarized-light FTIR spectra collected on a 112-mu m-thick [001] section show maximum absorption with E (perpendicular to) c, suggesting that the linear CO (sub 2) molecules are oriented perpendicular to the crystallographic c axis, as in beryl (Wood & Nassau, 1967) or cordierite (Armbruster & Bloss, 1980). In situ high-T FTIR data collection up to 550 degrees C shows that the CO (sub 2) band decreases in intensity and broadens with increasing T; release of carbon dioxide from the structure starts at T > 250 degrees C and is complete at approximately 450 degrees C. The same kind of behaviour is observed for structural H (sub 2) O; upon heating pitiglianoite becomes virtually anhydrous at T approximately 500 degrees C. These data suggest that the extraframework volatile composition of cancrinite-type minerals is strongly T dependent, hence the analysis of pitiglianoite may provide geothermometric information on the genetic environment (typically late-stage volcanic) of these minerals.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 17
Serial Issue: 6
Title: CO (sub 2) in minerals of the cancrinite-sodalite group; pitiglianoite
Title: Micro- and mesoporous mineral phases
Author(s): Della Ventura, GiancarloBellatreccia, FabioBonaccorsi, Elena
Author(s): Merlino, S.editor
Affiliation: Universita Roma Tre, Dipartimento di Scienze Geologiche, Rome, Italy
Pages: 847-851
Published: 200512
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
Meeting name: Micro- and mesoporous mineral phases
Meeting location: Rome, ITA, Italy
Meeting date: 20041206Dec. 6-7, 2004
References: 24
Accession Number: 2006-015607
Categories: Mineralogy of silicates
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus.
N41°13'60" - N42°49'60", E11°30'00" - E14°00'00"
Secondary Affiliation: Universita di Pisa, ITA, Italy
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200608
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