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An experimental investigation of agglutinate melting mechanisms - Shocked mixtures of Apollo 11 and 16 soilsMixtures of chemically contrasting lunar soils have been shocked at pressures ranging from 18.2-62.0 GPa. Other than the generation of impact melts, modal and textural changes caused by shock include destruction of pore space and fused soil clasts and conversion of plagioclase to maskelynite. The loss of the fused soil component in these runs indicates that low agglutinate contents in shocked and/or compacted regolith breccias cannot be considered by themselves to be evidence of formation from immature regolith. From the petrographic and chemical data it appears that the impact glass formed mainly from the fine fraction and the fused soil component in the target, with relatively minor contributions from the other coarse clasts. The impact glasses exhibit the same chemical enrichments and depletions as their corresponding fine fractions and plot on or near a mixing line between the bulk and fine fraction of the soil in which they were formed. From this as well as several other studies it appears that the fusion of the finest fraction model is valid and that it accurately predicts the chemical systematics of impact glass formed from lunar soil. In addition, fusion of agglutinates present in the target soil is an important process.
Document ID
19870038377
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Simon, S. B.
(South Dakota School of Mines and Technology Rapid City, SD, United States)
Papike, J. J.
(South Dakota School of Mines and Technology Rapid City, United States)
Horz, F.
(NASA Johnson Space Center Houston, TX, United States)
See, T. H.
(Lockheed Engineering and Management Services Co., Inc. Houston, TX, United States)
Date Acquired
August 13, 2013
Publication Date
November 30, 1986
Publication Information
Publication: Journal of Geophysical Research
Volume: 91
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
87A25651
Funding Number(s)
CONTRACT_GRANT: NAG9-22
Distribution Limits
Public
Copyright
Other

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