4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4 From: Julia Hammer <jhammer@xxxxxxxxxx> 4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4 *PhD Position in Volcanology-Petrology:* *Elucidating the role of magnetite in rhyolite vesiculation* We have an opening at the Department of Earth Science at the University of Hawaii at Manoa for an outstanding student to work on a research project tackling the role of Fe-Ti oxides in controlling the degassing, ascent, and explosivity of silicic magma. *Project summary: *Magnetite crystals enhance the rate of bubble nucleation by providing energetically-favorable substrates. However, failure to detect (via standard petrographic analysis) a sufficiently high abundance of these crystals in natural pumice has supported the inference that bubble nucleation occurs homogenously. Paradoxically, when numerical ascent models are supplied with measured bubble number densities and executed specifying homogeneous bubble nucleation, the predicted decompression and ascent rates are inconsistent with independent assessments and moreover, are physically impossible! Our NSF-funded research program explores the possibility that nanometer sized magnetite particles are present in magmas prior to eruption, and that these crystals trigger bubble nucleation at much lower supersaturation values (i.e., at greater depth in the plumbing system) than would occur in their absence. The selected graduate student will gain *expertise in physical volcanology, experimental petrology, and rock magnetism, through a combination of TA and RA support*. *Qualifications: *Candidates with and without a Masterâ??s degree may apply. Some research experience in igneous petrology and/or volcanology is preferred. Excellent work ethics, problem-solving skills, and motivation are a must! *Collaborating Personnel*: The candidate will be advised primarily by *Pr. Julia Hammer* and co-supervised by *Dr. Tom Shea*, both at UH Manoa. The student will also work closely with paleomagnetism expert *Pr. Stefanie Brachfeld* at Montclair State University. *Expected starting date*: August 2019 (Fall semester) *Application*: The application material should include: a cover letter, a CV, and the contact information of three referees. Send the material directly to jhammer@xxxxxxxxxx. Inquiries about the position should be sent to the same email address. For more info about the department: http://www.soest.hawaii.edu/gg/ ============================================================== Volcano Listserv is a collaborative venture among Arizona State University (ASU), Portland State University (PSU), the Global Volcanism Program (GVP) of the Smithsonian Institution's National Museum of Natural History, and the International Association for Volcanology and Chemistry of the Earth's Interior (IAVCEI). ASU - http://www.asu.edu/ PSU - http://pdx.edu/ GVP - http://www.volcano.si.edu/ IAVCEI - http://www.iavcei.org/ To unsubscribe from the volcano list, send the message: signoff volcano to: listserv@xxxxxxx, or write to: volcano-request@xxxxxxx. To contribute to the volcano list, send your message to: volcano@xxxxxxx. Please do not send attachments. ============================================================== ------------------------------
