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)