Letting off steam: New insights into volatile saturation and magma degassing
|Dates:||7 February 2018|
|Times:||13:00 - 14:00|
|What is it:||Seminar|
|Organiser:||Department of Earth and Environmental Sciences|
|Who is it for:||University staff, Adults, Alumni, Current University students, General public|
Join Madeleine Humphreys from Durham University for her seminar on volatile saturation and magma degassing.
Dissolved magmatic gases (volatiles) are one of the most important controls on the chemical and physical properties of melts and magmas, on magma phase relations and mineral abundances, and on melt viscosity. The release of volatiles into bubbles is the main driver of explosive volcanic eruptions. Consequently the timing of volatile exsolution, and the style and extent of physical segregation of gas from silicate melt, are critical for understanding the potential explosivity of magmatic systems, as well as fractionation and mineralisation processes.
In this talk Madeleine will explore how hydrous minerals such as apatite and amphibole can have significant advantages over traditional melt inclusion studies in understanding volatile enrichment, saturation and degassing. Apatite is particularly sensitive to the composition of fluids in equilibrium with magma, and amphibole is a useful monitor of trace metals and oxidation state. Together, this provides new insights into the timing of volatile saturation, the conditions of magma storage and eruption, and the composition of exsolved fluids prior to volcanic eruption or magma solidification.
This seminar is open to all and is a good opportunity to meet fellow students and staff; tea and coffee will be served at 12:30pm in the lobby on the first floor of the Williamson Building beforehand.
Organisation: Durham University
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