Igneous Petrogenesis

Module code: GL3120

Petrogenetic studies of igneous rocks involve the characterisation of magma source regions, the conditions of partial melting, and the extent of subsequent modification of primary magmas during transport and storage in magma reservoirs. A central aim is to understand the factors that control the compositional diversity of magmatic rocks.

In this module, you will explore the nature and composition of the Earth’s mantle and develop a quantitative understanding of magmatism at mid-ocean ridges, large igneous provinces (continental and oceanic), and island arcs.

You will examine the fundamental principles of magma formation, including the structure of silicate liquids, the role of partition coefficients during partial melting, and crystal fractionation processes using phase diagrams and melt modelling. You will also investigate the processes that modify primary magmas, including assimilation and magma mixing, and evaluate their importance in different tectonic settings.

The module emphasises the interpretation of whole-rock and mineral chemical data, including stable and radiogenic isotopes, alongside specialised isotope systems such as noble gases. Through workshops and guided data-driven exercises, you will develop the skills to analyse and interpret petrological and geochemical datasets, and apply these to reconstruct magmatic processes and the evolution of the solid Earth.