Aquamarine beryl from Zealand Station, Canada: a mineralogical and stable isotope study

Aquamarine crystals occur in crustal A-type pegmatite-aplite dykes and associated quartz veins and greisen zones at the Zealand Station Be-Mo deposit, south-central New Brunswick (Canada). Electron-probe microanalysis (EPMA) of aquamarine determined that the chromophore Fe (< 1.4 wt. % FeOT) is present in octahedral sites, with substitutions responsible for simple and oscillatory zonation (SEM-BSE imaging). Average water content (1.53 wt. %) was calculated using an empirical formula, consistent with two T-REL (>800 degrees C) of 1.3-1.4 wt. % in beryl channels. The delta O-18 of the quartz and beryl were within 1 parts per thousand, consistent with magmatic crystallization from an O-18 enriched source, and delta D values on channel water have magmatic signatures.