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Experiments have been conducted to quantify H 2 O loss from melt inclusions during laboratory heating using Raman spectroscopy. Quartz-hosted melt inclusions from the early-erupted plinian stage of the Bishop Tuff were heated to 800 °C and 1 kbar for 4 to 1512 h (63 days). Previous studies had shown that unheated melt inclusions from this unit of the Bishop Tuff contain 4.8–6.5 wt.% H ...