ABUNDANCE OF VOLATILES IN HAWAIIAN THOLEIITIC SUBMARINE BASALTS

High-temperature mass spectrometric studies have been made to determine the distribution of volatiles within glassy rims of submarine pillow basalts dredged from the east rift zone of Kilauea volcano, Hawaii. The CO2/H2O mole ratio for glass-vapor inclusions within olivine phenocrysts in the glassy rims is greater than 30 : 1 compared to 0.06 for matrix glasses. Enclosing matrix glasses contain 0.53-0.74 wt.% H2O, 0.02-0.04 wt.% carbon, 0.08-0.12 wt.% sulfur, 0.012-0.028 wt.% chlorine and 0.012-0.077 wt.% fluorine. © 1979.