Rapid Assembly of the 25.4 ka Oruanui magma body, Taupo Volcanic Center, NZ by Tyler David Schlieder

Tyler David Schlieder

UC Davis | Montgomery St. Foundation Endowment Fund

I am working to better constrain the pre-eruptive thermal and physical state of silicic magmatic systems of different size and eruption style/magnitude. In order to investigate these topics, I integrate multiple chronometers in volcanic crystals, including Uranium-series disequilibria and diffusion modeling of trace element concentration profiles, with compositional information recorded within crystal and melt components of erupted lavas. My field areas include Mount St. Helens, Washington State, USA and the Taupo Volcanic Center, New Zealand.


Volcanic systems play a critical role in the evolution of continental crust, the recycling of volatile elements from mantle to atmosphere, and pose significant hazard to modern civilization. Despite their societal significance many aspects of silicic magmatic systems remain poorly understood. Age and compositional analysis of crystals extracted from volcanic rocks are one means by which we can investigate the evolution of large silicic magma bodies. We report new U-Th age and trace-element data for zircons separated from the 25.4 ka Oruanui eruption (the world’s most recent known super-eruption). These data provide a more complete record of zircon crystallization than previous analyses, which were restricted to whole-rock (WR) zircon interiors, and demonstrate that plagioclase-hosted zircons and whole-rock hosted zircon rims both record processes obscured in the WR zircon interior data.


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