High temperature mass spectrometric gas-release studies of Hawaiian volcanic glass: Pele's tears

Details High temperature mass spectrometric gas-release studies of Hawaiian volcanic glass: Pele's tears High temperature mass spectrometric gas-release studies of Hawaiian volcanic glass: Pele's tears

Jun 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37.1551m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 37, Issue 6, pp.1551-1558

Computer Science

5

Scientific paper

The identification of gaseous molecular species and mechanisms of their release from glassy lava have been investigated with a high temperature mass spectrometer. Using Pele's tears as representative of quenched liquids of Hawaiian tholeiitic basalts, it was found that volatiles are released at low temperatures by a rate-limiting diffusion mechanism and, at temperatures in the softening range of the glass, by bursting of bubbles trapped near the vaporizing surface of the sphere-like particles. Gases released by bursting gave pressure surges and were found to be water vapor, CO 2 and CO. Those released principally by diffusion, and in some cases generated by thermal degradation and further reaction with the sample, include H 2 , O 2 , N 2 , S 2 , H 2 S, SO 2 , SO 3 , COS, HCl, HF and NH 3 . Average mole percent compositions of the volatiles H 2 O, CO 2 and SO 2 relative to the total gas released were found to be 95 per cent, 3·5 per cent and 1 per cent, respectively. Minor concentrations of organic constituents, previously unobserved in volcanic gas analyses, were also found. Fragmentation patterns and gas release behavior suggest that these are derived from a mixture of low-molecular weight saturated and unsaturated acyclic hydrocarbons (C 1 -C 4 ).

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