Petrogenesis of magmas in the Antillanca volcanic complex (Southern Chile) over space and time
Combine mineralogy and geochemistry to look at the magmatic evolution of Chilean volcanoes.
How do magmatic systems evolve over time? Do they become more or less complex in terms of their ‘plumbing’?
This project will examine an exceptional set of samples collected through a volcanic time sequence from southern Chile. Compositions of the volcanic material in this deposit change from evolved and amphibole-bearing to less evolved over time – what is happening in the melting region to produce those changes?
The student will examine key hand specimens and thin sections and investigate the whole rock chemistry to model the petrogenetic evolution of this sequence. Fractional crystallisation and melting will be investigated using major and trace element geochemistry.
Geochemical modelling tools and Sr-Nd isotopes will be obtained to look at the role crustal assimilation may have had on the magmas. Putting the conclusions from the geochemistry into the context of the volcanic eruption sequence will provide insight into how magmatism in this area of Chile has changed over time.