Computer Science
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.112...61p&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 112, no. 1-4, Aug. 1992, p. 61-73.
Computer Science
18
Actinide Series Compounds, Crystal Growth, Magma, Radioactive Decay, Volcanoes, Degassing, Radiochemistry, Steady State
Scientific paper
A new geochemical method for determining magma residence times (tau) below active volcanoes is presented. Equations are derived which permit the calculation of tau for any steady-state, crystallizing system. This method requires the measurement of short-lived actinide series disequilibria in freshly erupted lavas, and may be applied to steady-state magma systems of any composition. The calculated value of tau can be used to determine the volume of magma beneath actively erupting volcanoes, and to obtain quantitative crystal growth rates. The few data available suggest that the magma chamber residence time below several volcanoes today (Etna, Stromboli, Oldoinyo Lengai) is between 10 and 100 years. The annual magma output from any one of these volcanoes represents only 1-10 percent of the volume of magma in the chamber.
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