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Title: The rheology of pore and crystal bearing magmas
Author: Coats, Rebecca
ISNI:       0000 0004 7970 5029
Awarding Body: University of Liverpool
Current Institution: University of Liverpool
Date of Award: 2019
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Magmas are viscoelastic multi-phase materials, comprising of a complex mixture of melt, vesicles (or pores) and crystals. Their rheology describes the way in which they deform - flow or fail - in response to local stresses. As magmas rise through the conduit, they are subjected to transient pressure (stress) and temperature conditions which cause their composition, componentry, and ultimately their rheology, to evolve. The dynamic nature of magmas means constraining their evolving rheology is an arduous task, and consequently failure forecasting models have disparities from observations. Knowledge gaps arise from a lack of understanding of magma behaviour as it undergoes (seismogenic) rupture, transitioning from the viscous to the brittle field. To effectively forecast volcanic hazards and thus improve risk mitigation strategies, a magma's rheological dynamism needs to be well constrained for use in magma transport and volcanic eruption models. With the aim of improving our knowledge of magma rheology, this doctoral dissertation details experimental studies carried out on natural volcanic products and synthetic silicate analogues.
Supervisor: Lavallee, Yan ; Kendrick, Jackie Evan Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral