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A shock-induced phase change in iron-silicate garnet.Hugoniot measurements on iron-silicate garnet demonstrate that above a shock pressure of about 205 kbar transition to a high-pressure phase(s), having an apparent zero-pressure density and bulk modulus of 4.44 g/cu cm and 3.3 Mbar, occurs. Crystal chemical systematics and Debye-Scherrer X-ray patterns of a recovered phase(s), which may be the shock-induced high-pressure form, suggest possible formation of a phase with a density of 4.48/cu cm. Occurrence of such a polymorph of garnet in the mantle would give rise to an increase in density and seismic velocity below 600 km in the earth.
Document ID
19720042858
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ahrens, T. J.
Graham, E. K.
(California Institute of Technology Pasadena, Calif., United States)
Date Acquired
August 6, 2013
Publication Date
February 1, 1972
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 14
Subject Category
Geophysics
Accession Number
72A26524
Funding Number(s)
CONTRACT_GRANT: NSF GA-21396
CONTRACT_GRANT: NGL-05-002-105
Distribution Limits
Public
Copyright
Other

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