Potassium argon dating principles techniques and applications to geochronology
Phenocrysts of orthopyroxene, hornblende and plagioclase are interpreted to have occluded argon within their mineral structures deep in the magma chamber and to have retained this argon after emplacement and solidification of the dacite.
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The third dacite lava dome began to appear on 18 October 1980 above the lip of a 25-metre-diameter feeding conduit.Experimental data from the assemblage of minerals in the dacite indicate that just prior to the eruption the upper part of the magma chamber was at a temperature of 930°C and at a depth of about 7.2 km.
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