Institutionen för geovetenskaper

Chemistry and Physics of Multiphase Magmas: Insights into Melt Extraction Processes

  • Datum: 2017-03-21 kl 15:00 16:00
  • Plats: Geocentrum Norrland I
  • Föreläsare: Dr. Mattia Pistone
  • Arrangör: Bjarne Almqvist
  • Kontaktperson: Bjarne Almqvist
  • Seminarium

Mattia Pistone is a research scientist at Lausanne University in Switzerland, who focuses on physical and chemical properties of multiphase magmas.

His research uses both experimental and field-based approaches to address how water content, gas bubbles and crystals can change the rheology of magma, with implications for the eruptive style of volcanoes. Currently he is the holder of an Ambizione fellowship in Switzerland, to study the petrology and rheology of magma in the lower continental crust, and how such knowledge may help in the seismic characterization of the continental Moho. 

Abstract 

 

 The dynamics and kinetics of melt extraction from lithospheric rocks are essential to the construction of the crust, feeding volcanic eruptions, as well as maintaining a hydrosphere and atmosphere on Earth. In my research, I focus on investigating the chemical and physical properties of multiphase magmas in experimental systems at elevated temperatures and pressures. My main goal is to link the experimental findings with the chemical and physical signatures of natural magmatic systems. Laboratory-based experiments, accompanied by high-spatial resolution analytical investigations, also provide a mean to assess the spatial and temporal dynamics of magmatic systems. I will present three scenarios in which melt extraction processes can be initiated and enhanced by: 1) water diffusion during mafic-felsic magma mixing events; 2) water exsolution in crystallising felsic mushes; 3) strain localisation in melt- and bubble-enriched portions of multiphase systems. Each mechanism will then be evaluated to determine the efficiency of melt extraction within the longevity of plutonic mushes in the Earth’s crust.