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AbstractSpectroscopic measurements of water in glass inclusions in pyroxene from boninite samples from the Bonin Islands conclusively document the high (2.83.2wt%) primary water contents of boninite magmas. Associated quenched glass from pillow lava rims have slightly lower (2.22.4wt%) water contents, suggesting that minor amounts of degassing occurred between the time of melt entrapment in the orthopyroxenes...