IR Spectroscopy of Olivine from Kimberlitic Magma

File(s)
Date
2012-04Author
Hughes, Cameron A.
Advisor(s)
Ihinger, Phillip D.
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Show full item recordAbstract
Olivine, the most common mineral in the upper mantle, represents a major component in most
mafic magmas. Olivine crystals derived from mantle xenoliths contain hydroxyl impurities and are thought to represent the major reservoir for water in the high-pressure mantle environment.
However, olivine crystals sampled from tholeiitic basalts do not contain measurable water. Non-stoichiometric water is observed in a variety of nominally anhydrous crustal minerals, such as
quartz and feldspar. Incorporation of water into these minerals is generally attributed to kinetic
effects associated with non-equilibrium growth. Silica-poor magmas are typically volatile-rich and
have extremely low viscosities promoting rapid crystal growth during transport and emplacement. The purpose of this study was to test the hypothesis that olivine crystals formed in silica-undersaturated, water-rich magmas incorporate measurable hydrous impurities due to their rapid growth.
Subject
Spectrum analysis
Olivine
Magmas
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http://digital.library.wisc.edu/1793/63362Type
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Color poster with text, diagrams, images, photographs, and graphs.