Analytical Investigations; Melt; Geophysics; Rheology; Numerical Simulations; Fieldwork; Segregation; Moho; Petrology
Kudrna-PrašekMarko, PistoneMattia, BakerDon, SodiniNicola, MarinoniNicoletta, LanzafameGabriele, ManciniLucia (2018), A compact and flexible induction furnace for in-situ X-ray microradiograhy and computed microtomography at Elettra: characterisation and first tests, in Journal of Synchrotron Radiation
, 25, 1172-1181.
Pistone Mattia, Muntener Othmar, Ziberna Luca, Hetényi György, Zanetti Alberto (2017), Report on the ICDP workshop DIVE (Drilling the Ivrea–Verbano zonE)
, Copernicus Publications, Scientific Drilling.
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. To date, none of the diverse research studies undertook an investigation aimed at determining both chemical and physical conditions for melt extraction from the most unexplored portion of the Earth’s continental lithosphere - the Moho transition zone - where residual hydrous, aphyric melts are thought to be extracted at the melt connectivity transition at which rock strength and viscosity dramatically decrease. To date, there are controversial hypotheses that do not sufficiently explain the physical and chemical conditions for melt extraction at the Moho. Therefore, I propose a multidisciplinary project aimed at quantifying both chemical and physical aspects of melt extraction processes at the Moho. Specifically, I propose an analytical investigation of comprehensive textures and chemistries of minerals from natural rocks collected in the Ivrea-Verbano Zone, which offers an almost complete section of the continental crust down to the upper mantle. To corroborate the analytical results, I also propose to investigate the physical mechanisms of melt extraction at the Moho through numerical simulations based on existing codes. The results produced in this project will provide a critically needed data compilation to calibrate existing geophysical data and models linking rock seismic wave velocities to the presence of melts in rocks and better unravel the Moho discontinuity from a geophysical, rheological, and petrological perspective. This research will be hosted at the Institute of Earth Sciences of the University of Lausanne for 36 months.