Revisiting the compositions and volatile contents of olivine-hosted melt inclusions from the Mount Shasta region: implications for the formation of high-Mg andesites

DM Ruscitto, PJ Wallace, AJR Kent - Contributions to Mineralogy and …, 2011 - Springer
Primitive chemical characteristics of high-Mg andesites (HMA) suggest equilibration with
mantle wedge peridotite, and they may form through either shallow, wet partial melting of the
mantle or re-equilibration of slab melts migrating through the wedge. We have re-examined
a well-studied example of HMA from near Mt. Shasta, CA, because petrographic evidence
for magma mixing has stimulated a recent debate over whether HMA magmas have a
mantle origin. We examined naturally quenched, glassy, olivine-hosted (Fo 87–94) melt …
被引用次数：56 相关文章 所有 9 个版本

Revisiting the compositions and volatile contents of olivine-hosted melt inclusions from the Mount Shasta region

D Ruscitto, P Wallace - AGU Fall Meeting Abstracts, 2008 - ui.adsabs.harvard.edu
Recent controversy over the origin of high-Mg andesites from the Mount Shasta region has
prompted us to re-examine olivine-hosted melt inclusions from this area. We analyzed
olivine-hosted (Fo88-94) melt inclusions from tephra of the S17 cinder cone (N flank
Whaleback), north of Mount Shasta, using FTIR and electron microprobe. The melt inclusion
compositions (uncorrected for post-entrapment crystallization) range from 54-63 wt% SiO2
and 4.0-6.7 wt% MgO, and they can be divided into high (> 12 wt%) and low (< 10 wt%) CaO …
被引用次数：3 相关文章
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