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CO₂ in minerals of the cancrinite-sodalite group

¹ Dipartimento di Scienze Geologiche, Università Roma Tre, Largo S. Leonardo Murialdo 1, I-00146 Roma, Italy
² Dipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria 53, I-56126 Pisa, Italy

^* E-mail: dellaven{at}uniroma3.it

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-µm-thick [001] section show maximum absorption with E 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°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°C and is complete at 450°C. The same kind of behaviour is observed for structural H₂O; upon heating pitiglianoite becomes virtually anhydrous at T 500°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.

Key-words: pitiglianoite, Monte Cavalluccio (Latium, Italy), single-crystal FTIR spectroscopy, polarized measurements, in situ HT-spectroscopy, CO₂, H₂O..

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