This paper presents spectroscopic evidence for the presence Of CO2 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(-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 CO2 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 CO2 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 similar to 450 degrees C. The same kind of behaviour is observed for structural H2O; upon heating pitiglianoite becomes virtually anhydrous at T similar to 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.

DELLA VENTURA, G., Bellatreccia, F., Bonaccorsi, E. (2005). CO2 in minerals of the cancrinite-sodalite group: pitiglianoite. EUROPEAN JOURNAL OF MINERALOGY, 17, 847-851 [10.1127/0935-1221/2005/0017-0847].

CO2 in minerals of the cancrinite-sodalite group: pitiglianoite

DELLA VENTURA, Giancarlo;BELLATRECCIA, FABIO;
2005-01-01

Abstract

This paper presents spectroscopic evidence for the presence Of CO2 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(-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 CO2 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 CO2 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 similar to 450 degrees C. The same kind of behaviour is observed for structural H2O; upon heating pitiglianoite becomes virtually anhydrous at T similar to 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.
2005
DELLA VENTURA, G., Bellatreccia, F., Bonaccorsi, E. (2005). CO2 in minerals of the cancrinite-sodalite group: pitiglianoite. EUROPEAN JOURNAL OF MINERALOGY, 17, 847-851 [10.1127/0935-1221/2005/0017-0847].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/142564
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