Multiphase Flow in Crustal Magmatic Processes

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• Joe Dufek (Georgia Institute of Technology)
• Thursday 18 February 2016, 16:00-17:00
• Seminar Room 1, Newton Institute.

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MIMW01 - From foundations to state-of-the-art in magma/mantle dynamics

Multiphase dynamics in crustal magmatic processes have analogy with many processes occurring in the mantle and span phenomena from slow, dense granular flows to rapidly shearing granular flows during volcanic eruptions. In this talk I will discuss these two end-members in the context of magma chamber dynamics and eruptive dynamics. In the magma dynamics case, the efficiency of the relative motion between melt and crystals produces distinct compositional trends that can be compared with the chemistry of melts and phase equilibria. This work will consider differentiation scenarios in both simplified magma reservoir geometries and those that are emergent with the successive input from intrusions in an open system. Evidence of open systems and assembly of magmatic systems incrementally are present in a range of plutonic and volcanic rocks. To evaluate the timescales of silicic magma production, a multiphase dynamics model will be discussed that includes heat transfer, phase equil ibria and relative motion between a melt and several crystal phases. A particular focus of this presentation is a comparison of dynamic processes to proxies used as chronometers. The other end-member considered are flows produced during explosive eruptions. During explosive eruptions the interstitial fluid is often a gas and the granular flow has significant inertia. I will compare and contrast granular stress concentration, entrainment, and fluid expulsion in this regime as well as discuss the prospects for integrating a range of laboratory experimental and numerical approaches.

This talk is part of the Isaac Newton Institute Seminar Series series.

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