Thermal history of magmas; the low pressure reference point

Abstract
A simple model of volcanic plumbing, which predicts that many observed mineralogical and geochemical features of basalts are products of near-surface fractional crystallization, also predicts that erupted lavas may be 100-250 °C cooler than the parental magma entering the magma chamber, as well as considerably reduced in mass. Observations of the energy of erupted lavas do not, therefore, form a useful reference point from which to attempt to reconstruct the thermal budget of the igneous process and provide only a lowest estimate of the rate at which thermal energy could be extracted from an active volcano on a long term basis.

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