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MASS SPECTROMETRIC ANALYSIS OF VOLATILES IN FLUID INCLUSIONS DECREPITATED BY CONTROLLED HEATING UNDER VACUUM

Damien Gaboury, Moussa Keita, Jayanta Guha and Huan-Zhang Lu

Sciences de la Terre, Centre d’étude sur les ressources minérales, Université du Québec à Chicoutimi, 555 boul. de l’Université, Chicoutimi, Québec, Canada G7H 2B1

Corresponding author: e-mail, dgaboury{at}uqac.ca

We report analyses by mass spectrometry of gases released from decrepitating fluid inclusions during progressive and controlled heating under vacuum. The results are presented graphically as gas abundance (AMU) relative to the temperature of decrepitation. Such data establish the composition of fluid inclusion assemblages with similar temperatures of decrepitation. A description of the technique, characteristics of the apparatus, analytical procedures, data treatment, and interpretation are presented. The advantages over the traditional gas analysis approaches by mass spectroscopy are also discussed.