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Genesis of recent silicic magmatism in the Medicine Lake Highland, California - Evidence from cognate inclusions found at Little Glass MountainSparse, granular inclusions of early-formed minerals found within the Little Glass Mountain rhyolite flows in northern California are shown to provide a means of characterizing the physical conditions, at depth, beneath the Medicine Lake Highland during the latest phase of volcanic activity. Mineral compositions, in combination with thermodynamic calculations and experiments, suggest crystalization at a pressure of 5,200 bars within a 966-836 C temperature range; implying that mineral segregation and equilibration occurred at a depth of 15-18 km beneath the surface. In addition, mass balance calculations indicate that the Medicine Lake flow is a close approximation to the parental magma for the latest silicic lavas.
Document ID
19810064023
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mertzman, S. A.
(Franklin and Marshall College Lancaster, PA, United States)
Williams, R. J.
(NASA Johnson Space Center Geochemistry Branch, Houston, TX, United States)
Date Acquired
August 11, 2013
Publication Date
September 1, 1981
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 45
Subject Category
Geophysics
Accession Number
81A48427
Distribution Limits
Public
Copyright
Other

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