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Dynamic crystallization of silicate meltsTwo types of furnaces with differing temperature range capabilities were used to provide variations in melt temperatures and cooling rates in a study of the effects of heterogeneous nucleation on crystallization. Materials of chondrule composition were used to further understanding of how the disequilibrium features displayed by minerals in rocks are formed. Results show that the textures of natural chondrules were duplicated. It is concluded that the melt history is dominant over cooling rate and composition in controlling texture. The importance of nuclei, which are most readily derived from preexisting crystalline material, support an origin for natural chondrules based on remelting of crystalline material. This would be compatible with a simple, uniform chondrule forming process having only slight variations in thermal histories resulting in the wide range of textures.
Document ID
19850006465
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Russell, W. J. (Lunar and Planetary Inst. Houston, TX, United States)
Date Acquired
September 5, 2013
Publication Date
August 10, 1984
Subject Category
Astrophysics
Report/Patent Number
NAS 1.26:174103
NASA-CR-174103
Accession Number
85N14774
Funding Number(s)
CONTRACT_GRANT: NASW-3389
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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