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The origin of chondrules - Experimental investigation of metastable liquids in the system Mg2SiO4-SiO2Laser-melted magnesium silicate droplets were supercooled 400-750 C below their equilibrium liquidus temperatures before crystallization and their texture was compared with that of meteoritic and lunar chondrules. Crystal morphology, width and texture were studied in relation to nucleation temperature and bulk composition. It was found that the only phase to nucleate from the forsterite-enstatite normative melts was forsterite. Highly siliceous glass, about 65% SiO2 by weight, was identified interstitially to the forsterite crystals in seven of the MgSiO4 spherules and was thought to be present in all.
Document ID
19760056430
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1016/0016-7037(76)90137-X
Authors
Blander, M. (Argonne National Laboratory Argonne, Ill., United States)
Planner, H. N. (Argonne National Lab. IL, United States)
Keil, K. (New Mexico, University Albuquerque, N. Mex., United States)
Nelson, L. S. (Argonne National Lab. IL, United States)
Richardson, N. L. (Sandia Laboratories Albuquerque, N. Mex., United States)
Date Acquired
August 8, 2013
Publication Date
August 1, 1976
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 40
Subject Category
Lunar And Planetary Exploration
Accession Number
76A39396
Funding Number(s)
CONTRACT_GRANT: NGL-32-004-063
CONTRACT_GRANT: NASA ORDER 13441
CONTRACT_GRANT: NGL-32-004-064
Distribution Limits
Public
Copyright
Other

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