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Radiation Damage and Helium Diffusion in Mineral Chronometers


Abstract A mineral’s helium content reflects a balance between two competing processes: accumulation by radioactive decay and temperature-dependent diffusive loss. (U-Th)/He dating of zircon and other uranium and thorium-bearing minerals provides insight into the temperature histories of rocks at or near Earth’s surface that informs geoscientists’ understanding of tectonic and climate-driven exhumation, magmatic activity, and other thermal events. The crystal structure and chemistry of minerals affect helium diffusion kinetics, recorded closure temperatures, and interpretations of (U-Th)/He datasets. I used empirical and experimental methods to investigate helium systematics in two minerals chronometers: zircon and xenotime.

The same radioactivity ... (more)
Created Date 2019
Contributor Anderson, Alyssa Jordan (Author) / Hodges, Kip (Advisor) / van Soest, Matthijs (Committee member) / Till, Christy (Committee member) / Shim, Sang-Heon (Committee member) / Sharp, Tom (Committee member) / Arizona State University (Publisher)
Subject Geology / Geochemistry / helium diffusion / radiation damage / thermochronology / xenotime / zircon
Type Doctoral Dissertation
Extent 222 pages
Language English
Copyright
Note Doctoral Dissertation Geological Sciences 2019
Collaborating Institutions Graduate College / ASU Library
Additional Formats MODS / OAI Dublin Core / RIS


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Description Dissertation/Thesis