Partial melting of mantle and crustal rocks is an important process for the genesis of a suite of igneous rocks seen at the surface of the earth. These rocks preserve the imprints of the complex physico-chemical processes in the earth’s interior in the form of their distinct end-member geochemical and isotopic compositions. Spatial and temporal variations in temperature, pressure, fluid mass and concentration of chemical species basically control the petrological property of rocks. This chapter describes basic framework of petrological modelling approach to quantify the deeper processes. Most frequently used equations for geotherm construction for continental and oceanic lithosphere, degree of partial melting and its distribution with depth due to perturbation in geotherms, partition of trace elements and radioactive elements in various partial melting models, crustal evolution and chemical geodynamics models are presented with their derivations.
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RNS is grateful to INSA, India for the award of a Senior Scientists scheme to him. Contribution under PSC0204 (INDEX) and MLP6107-28 (AM).
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