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The grain growth of iron - Implications for the thermal conditions in a lunar ejecta blanketThe times and temperatures for the growth of single-domain to multidomain iron have been determined in a synthetic glass of Apollo 11 composition. All single-domain iron grows to multidomain iron under the following conditions: at 975 C in about 5 hours; at 900 C in about 18 days; at 810 C in about 320 days; and at 700 C in about 1100 years (extrapolated). The results, together with thermal constraints on the metamorphism of lunar breccias, indicate cooling rates of breccias containing single domain iron are appropriate for formation in an ejecta blanket.
Document ID
19750055506
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Usselman, T. M.
(NASA Johnson Space Center Houston, Tex., United States)
Pearce, G. W.
(Toronto, University Toronto, Canada)
Date Acquired
August 8, 2013
Publication Date
January 1, 1974
Subject Category
Lunar And Planetary Exploration
Meeting Information
Meeting: Lunar Science Conference
Location: Houston, TX
Start Date: March 18, 1974
End Date: March 22, 1974
Accession Number
75A39578
Distribution Limits
Public
Copyright
Other

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