Abstract
Fluid inclusions in minerals provide a source of geologically significant fluids. A new computerized mass spectrometric technique for analyzing volatiles in individual inclusions has been developed. The inclusions are opened by decrepitation in vacuum, and the computer recognizes the abrupt rise in pressure and controls the mass spectrometer. This scans continuously from 1 to 65 amu every 25 ms, which is within the time constraints of a bursting inclusion. The peak height for each mass in each spectrum is measured and stored along with the background data. Data are reduced after analysis. Each mass number is assigned its own attenuation factor by the computer in a preliminary analysis. This permits the determination of trace components down to 1 part in 10,000. With this system it is possible to analyze up to 225 inclusions in 1 h using a 10-mg sample of quartz, calcite, plagioclase, pyroxene, galena, or other mineral.
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