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IR Spectroscopy of Olivine from Kimberlitic Magma

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Author(s)
Hughes, Cameron A.
Advisor(s)
Ihinger, Phillip D.
Date
Apr 2012
Subject(s)
Spectrum analysis; Olivine; Magmas; Posters
Series
USGZE AS589
Abstract
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.
Description
Color poster with text, diagrams, images, photographs, and graphs.
Sponsor(s)
University of Wisconsin--Eau Claire Office of Research and Sponsored Programs.
Permanent link
http://digital.library.wisc.edu/1793/63362 
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