Production of synthetic fluid inclusions in the H2O-CH4-NaCl system using laser-ablation in fluorite and quartz
Dubessy, Jean; Guillaume, Damien; Buschaert, Stéphane; Fabre, Cécile; Pironon, Jacques
European Journal of Mineralogy Volume 12 Number 6 (2000), p. 1083 - 1091
published: Nov 17, 2000
manuscript accepted: May 18, 2000
manuscript received: Mar 10, 2000
ArtNo. ESP147051206003, Price: 29.00 €
Abstract Synthesis of fluid inclusions is made by the pre-formation of cavities with a diameter greater than 10 μm by laser ablation using a Nd-YAG pulsed laser focused through a Cassegrain objective. Ablation cavities inside the crystals are connected to the surface by microcracks, which serve as the fluid channels. In fluorite crystals, the microcracks heal at 200°C during four-week experiments and produce large inclusions corresponding to the ablation cavities and smaller ones in the microcracks. In quartz crystals, cavity sealing occurs by quartz overgrowths on faces perpendicular to the c axis at 300°C during four weeks. No cavity sealing occurs at 200°C in quartz. Microthermometric data demonstrate that fluid inclusions have trapped representative samples of the experimental fluids. Raman and infrared spectra indicate that fluid inclusions synthesised by our laser technique may be suitable for spectroscopic analysis.