The role of shear heating in producing crystal-poor obsidian
Public Deposited- Last Modified
- March 22, 2019
- Creator
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Curry, Adam Charles
- Affiliation: College of Arts and Sciences, Department of Geological Sciences
- Abstract
- The reasons for obsidian's lack of phenocrysts (2 vol%) contain plagioclase and sanidine but sometimes lack quartz. Crystal-poor samples contain dominantly rounded phenocrysts indicative of resorption, whereas phenocrysts in crystal-rich samples contain sharp, defined corners. Thermal models of ascending, high-silica magma were run using COMSOL Multiphysics to assess temperature increases caused by shear heating, which could potentially resorb crystals. Models show large (>300 K) temperature increases at the conduit edges capable of resorbing crystals. Though model dike geometry is unrealistic, obsidian mineralogy and thermal modeling are consistent with shear heating-induced resorption during ascent of high-silica magmas.
- Date of publication
- December 2013
- Keyword
- DOI
- Resource type
- Rights statement
- In Copyright
- Note
- Includes one supplemental Excel file.
- Advisor
- Glazner, Allen F.
- Degree
- Master of Science
- Graduation year
- 2013
- Language
- Publisher
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This work has no parents.
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The role of shear heating in producing crystal-poor obsidian | 2019-04-09 | Public | Download |
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The role of shear heating in producing crystal-poor obsidian--Supplemental Exce | 2019-04-09 | Public | Download |