Zircon and Plagioclase Chronicles of Volcano-Magmatic Evolution
Unraveling dynamics of volcano-magmatic systems remains a great challenge due to absence of direct observations of magma formation, storage or eruptions. Recent advances in analyzing minerals like zircon or plagioclase offer a window into these hidden processes.

Zircon, a remarkably resistant mineral, can grow for many thousands of years within slowly cooling magma chambers. Despite this slow crystallization, these crystals retain signatures of disequilibrium trace element partitioning (e.g., Hf, Y, U, Th) and Zr isotopic fractionation due to diffusion. Simulation of these processes transforms zircon crystals to thermometers and clocks, recording the thermal evolution of individual magma parcels.
Plagioclase, another key witness, offers insights into pre-eruptive magma ascent and storage conditions. Core-to-rim variations in Anorthite content, Sr, and Ba concentrations reflect changes in pressure and temperature providing valuable clues about the complex dynamics leading up to an eruption.
Date: 31 May 2024, 12:00 (Friday, 6th week, Trinity 2024)
Venue: Department of Earth Sciences, South Parks Road OX1 3AN
Venue Details: Lecture Theatre
Speaker: Prof Oleg Melnik (Oxford)
Organising department: Department of Earth Sciences
Part of: Earth Sciences departmental seminars
Booking required?: Not required
Audience: Public
Editor: Maria Petrunova