Abstract
Conductiometric titrations can be used to simulate subduction-setting volcanism. The addition of saline solution from a burette to an initial amount of solution of lower salinity represents the replenishment of an upper-crustal magma chamber by more mafic material. This addition can either be continuous to represent direct addition of subducted material or discontinuous, thereby representing replenishment by rising diapirs. Fractionation can be simulated by dilution; eruption by withdrawal of samples. Comparison of conductance-titre plots with geochemical-parameter vs. age plots of real systems indicates that diapirically replenished chambers and fractionation-dominant chambers are monotonic increasing and monotonic decreasing functions. Suggestions are made as to the use of this technique in teaching volcanic mechanisms and geochemical indications of tectonic setting.
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