Geochemistry of glasses from ODP Site 125-786, supplement to: Newman, Sally; van der Laan, Sieger R (1992): Volatile contents of Izu-Bonin Forearc volcanic glasses. In: Fryer, P; Pearce, JA; Stokking, LB; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 125, 131-139

Sally Newman & Sieger R van der Laan
Eleven glasses recovered from Holes 786A and 786B were fresh enough for volatile analysis by infrared spectroscopy. The compositions of these glasses range from boninitic to rhyolitic. The glasses from the boninites contain 1.4 to 1.7 wt% H2O, while the rhyolitic glasses contain 2 to 6 wt% H2O, and all glasses have less than 30 to 40 ppm CO2. The highest H2O contents are probably the result of seawater alteration. The unaltered dacitic to rhyolitic...
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