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Cooling rate estimations based on kinetic modelling of Fe-Mg diffusion in olivineA finite one-dimensional kinetic model was developed to estimate the cooling rates of lunar rocks. The model takes into consideration the compositional zonation of olivine and applies Buening and Buseck (1973) data on ion diffusion in olivine. Since the 'as-solidified' profile of a given olivine is not known, a step-function, with infinite gradient, is assumed; the position of this step is based on mass balance considerations of the measured compositional profile. A minimum cooling rate would be associated with the preservation of a given gradient. The linear cooling rates of lunar rocks 12002 and 15555 were estimated by use of the olivine cooling-rate indicator to be 10 C/day and 5 C/day, respectively. These values are lower than those obtained by dynamic crystallization studies (10-20 C/day).
Document ID
19780057742
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Taylor, L. A.
(Tennessee, University Knoxville, Tenn., United States)
Onorato, P. I. K.
(Tennessee Univ. Knoxville, TN, United States)
Uhlmann, D. R.
(MIT Cambridge, Mass., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1977
Subject Category
Lunar And Planetary Exploration
Meeting Information
Meeting: Lunar Science Conference
Location: Houston, TX
Start Date: March 14, 1977
End Date: March 18, 1977
Accession Number
78A41651
Funding Number(s)
CONTRACT_GRANT: NGR-22-009-646
CONTRACT_GRANT: NGL-43-001-140
Distribution Limits
Public
Copyright
Other

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