Oxygen isotope exchange during thermal dehydration of copper selenate pentahydrate

Silica hydrate preserved with δ18O-rich quartz in high-temperature hydrothermal quartz in the high sulfidation copper-gold deposit at El Indio, Chile

“…The extreme isotopic shifts produced by non-equilibrium fractionation resulting from dehydration have been experimentally quantified at high-temperature (up to 600°C) for brucite, serpentine, carbonaceous chondrite (Clayton and Mayeda, 2009) and metal hydrates (Yapp, 1990;Hevroni and Danon, 2010 The precise history of isotopic zonation within quartz microcrystals is difficult to resolve, since the spot size of in situ analyses is greater than the fine oscillatory growth bands, resulting in isotopic mixing of multiple growth zones (Fig. 7).…”