The analysis of volatile traces such as H2O and CO2 in volcanic minerals may provide significant constraints on the genesis and evolution of magmatic systems. The analysis of water in minerals (e.g. Libowitzky and Rossman, 1997) and glasses (Ihinger et al., 1994) using FTIR spectrometry is now a relatively routine technique, however still few data exist on the H2O content and distribution in nominally-anhydrous minerals (NAMs) from volcanic environments. On the contrary, the spectroscopic analysis of CO2 is common in glasses or fluid inclusions within minerals (e.g. Linnen et al., 2004), although work on minerals has been so far restricted on few cases (see Armbruster and Bloss, 1980, Komenko and Langer, Della Ventura et al., 2005, 2007 and references therein). One additional point of extreme interest in the study of volcanic materials, is the distribution of the volatile constituent across the crystal, which can provide insight into the evolution of the crystallizing system with time; such possibility is offered by modern microscopes and spectrometers where a good spatial resolutions (20-30 µm) is coupled with computer-controlled stages or focal-plane-array (FPA) detector systems. In this work we explore the possibilities provided by the new facilities for microspectrometry recently made available at SIMBAD, INFN-LNF (Frascati, Rome), for the analysis of the distribution of water and carbon dioxide within some volcanic crystals. The specimens studied are from volcanic rocks spanning lava flows, pyroclastic deposits and volcanic ejecta, these latter representing fragments of the basement under the volcanic area (magmatic chamber or the volcanic conduct), scavenged during the explosive effusion and scattered on the surface. In particular we show here the data collected on several feldspathoids, clinopyroxenes, garnets, and cordierite. References Armbruster T. and Bloss F.D. (1980) Nature, 286, 140-141. Della Ventura, G., Bellatreccia, F., Bonaccorsi, E. (2005) Eur. J. Mineral., 17, 847-851. Della Ventura, G., Bellatreccia, F., Parodi, G.C., Cámara, F., Piccinini, M. (2007) Am. Mineral., in press. Khomenko V.M. and Langer K. (2005) Am. Mineral., 90, 1913-1917. Ihinger, P.D., Hervig, R.L., and McMillan. P.F. (1994) Rev. Mineral., 30, 67-121. Linnen, B., Keppler, H. and Sterner, S.M. (2004) Can. Mineral., 42, 1275-1282. Libowitzky, E. and Rossman, G.R. (1997) Am. Mineral., 82, 1111-1115.

DELLA VENTURA, G., Bellatreccia, F., Caprilli, E., Piccinini, M. (2007). Mapping of hydrogen and carbon in volcanic minerals: an infrared microspectrometry study, 1520-1520.

Mapping of hydrogen and carbon in volcanic minerals: an infrared microspectrometry study

DELLA VENTURA, Giancarlo;BELLATRECCIA, FABIO;
2007-01-01

Abstract

The analysis of volatile traces such as H2O and CO2 in volcanic minerals may provide significant constraints on the genesis and evolution of magmatic systems. The analysis of water in minerals (e.g. Libowitzky and Rossman, 1997) and glasses (Ihinger et al., 1994) using FTIR spectrometry is now a relatively routine technique, however still few data exist on the H2O content and distribution in nominally-anhydrous minerals (NAMs) from volcanic environments. On the contrary, the spectroscopic analysis of CO2 is common in glasses or fluid inclusions within minerals (e.g. Linnen et al., 2004), although work on minerals has been so far restricted on few cases (see Armbruster and Bloss, 1980, Komenko and Langer, Della Ventura et al., 2005, 2007 and references therein). One additional point of extreme interest in the study of volcanic materials, is the distribution of the volatile constituent across the crystal, which can provide insight into the evolution of the crystallizing system with time; such possibility is offered by modern microscopes and spectrometers where a good spatial resolutions (20-30 µm) is coupled with computer-controlled stages or focal-plane-array (FPA) detector systems. In this work we explore the possibilities provided by the new facilities for microspectrometry recently made available at SIMBAD, INFN-LNF (Frascati, Rome), for the analysis of the distribution of water and carbon dioxide within some volcanic crystals. The specimens studied are from volcanic rocks spanning lava flows, pyroclastic deposits and volcanic ejecta, these latter representing fragments of the basement under the volcanic area (magmatic chamber or the volcanic conduct), scavenged during the explosive effusion and scattered on the surface. In particular we show here the data collected on several feldspathoids, clinopyroxenes, garnets, and cordierite. References Armbruster T. and Bloss F.D. (1980) Nature, 286, 140-141. Della Ventura, G., Bellatreccia, F., Bonaccorsi, E. (2005) Eur. J. Mineral., 17, 847-851. Della Ventura, G., Bellatreccia, F., Parodi, G.C., Cámara, F., Piccinini, M. (2007) Am. Mineral., in press. Khomenko V.M. and Langer K. (2005) Am. Mineral., 90, 1913-1917. Ihinger, P.D., Hervig, R.L., and McMillan. P.F. (1994) Rev. Mineral., 30, 67-121. Linnen, B., Keppler, H. and Sterner, S.M. (2004) Can. Mineral., 42, 1275-1282. Libowitzky, E. and Rossman, G.R. (1997) Am. Mineral., 82, 1111-1115.
2007
DELLA VENTURA, G., Bellatreccia, F., Caprilli, E., Piccinini, M. (2007). Mapping of hydrogen and carbon in volcanic minerals: an infrared microspectrometry study, 1520-1520.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/174900
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