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The grape cluster, metal particle 63344,1The grape cluster metal particle 63344,1 found in lunar coarse fines is examined using the scanning electron microscope (SEM), electron microprobe, and an optical microscope. This metal particle is approximately 0.5 cm in its largest dimension and consists of hundreds of metallic globules welded together to form a structure somewhat like a bunch of grapes. Electron microprobe analysis for Fe, Ni, Co, P, and S in the metal was carried out using wavelength dispersive detectors. No primary solidification structure is observed in the globules, and the particle is slow cooled from the solidification temperature (nearly 1300 C) taking days to probably months to reach 600 C. Two mechanisms for the formation of globules are proposed. One mechanism involves the primary impact of an iron meteorite which produces a metallic liquid and vapor phase. The second mechanism involves the formation of a liquid pool of metal after impact of an iron meteorite projectile followed by a secondary impact in the liquid metal pool.
Document ID
19760035229
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Goldstein, J. I.
(Lehigh University Bethlehem, Pa., United States)
Axon, H. J.
(Manchester, Victoria University Manchester, United Kingdom)
Agrell, S. O.
(Cambridge University Cambridge, United Kingdom)
Date Acquired
August 8, 2013
Publication Date
December 1, 1975
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 28
Issue: 2, De
Subject Category
Lunar And Planetary Exploration
Accession Number
76A18195
Funding Number(s)
CONTRACT_GRANT: NGR-39-007-056
Distribution Limits
Public
Copyright
Other

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