Noble gas distribution in oceanic basalt glasses

Computer Science

Scientific paper

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Scientific paper

The distribution of noble gases has been investigated in six MORB glass samples using stepwise heating, vacuum crushing and the analysis of grain size fractions. These experiments indicate a strong noble gas partitioning into CO 2 -filled vesicles. An inhomogeneous distribution of argon isotopes within individual glasses is observed in several cases and is believed to result from the combined effects of the deep-seated component partitioning into vesicles and the contamination of the residual component dissolved in the glass by atmospheric noble gases. Using a mixing diagram, we are able to discriminate against atmospheric contamination and estimate the Ar partition coefficients. These coefficients are in qualitative agreement with the Henry's law constant for silicate melts.

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