Master of Science (MS)
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Second Advisor's Name
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Cordon Caulle, Volcano, historic eruptions, temperature, water content
Date of Defense
For better understanding of Plinian-hybrid eruptive events, I analyzed the variables that affect the pre-eruptive conditions of the latest three eruptive events of the Puyehue Cordon Caulle Volcanic Complex (PCCVC). The analysis was done by performing a petrological study of lava samples followed by Electron Probe Microanalysis (EPMA) on selected mineral phases. Mineral data were then used in established mathematical models to calculate pre-eruptive magma temperature and water content. The acquired data are compared to bulk measured water content, and the difference is utilized to estimate viscosities and evaluate the degassing regime. Results indicate that the historic eruptive events have similar bulk composition and pre-eruptive variables; the 2011 event has slightly lower temperature and higher water content. However, the differences do not suggest that the eruptive style varies in accordance with the variable changes but instead is controlled by external factors such as the regional tectonic regime. The influence of deep heat source is also possible.
Mingo, Mauro Andres, "Evaluation of Pre-eruptive Conditions for Cordon Caulle Rhyo-Dacitic Historic Eruptions" (2019). FIU Electronic Theses and Dissertations. 4228.
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