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Magnetic properties of Apollo 14 breccias and their correlation with metamorphism.The magnetic properties of Apollo 14 breccias can be explained in terms of the grain size distribution of the interstitial iron which is directly related to the metamorphic grade of the sample. In samples 14049 and 14313 iron grains less than 500 A in diameter are dominant as evidenced by a Richter-type magnetic aftereffect and hysteresis measurements. Both samples are of lowest metamorphic grade. The medium metamorphic-grade sample 14321 and the high-grade sample 14312 both show a logarithmic time-dependence of the magnetization indicative of a wide range of relaxation times and thus grain sizes, but sample 14321 contains a stable remanent magnetization whereas sample 14312 does not. This suggests that small multidomain particles (less than 1 micron) are most abundant in sample 14321 while sample 14312 is magnetically controlled by grains greater than 1 micron. The higher the metamorphic grade, the larger the grain size of the iron controlling the magnetic properties.
Document ID
19730035037
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Gose, W. A.
(Lunar Science Institute Houston, Tex., United States)
Pearce, G. W.
(Lunar Science Institute, Houston, Tex.; Toronto, University Toronto, Canada)
Strangway, D. W.
(NASA Manned Spacecraft Center Geophysics Branch, Houston, Tex., United States)
Larson, E. E.
(Colorado, University Boulder, Colo., United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1972
Subject Category
Space Sciences
Meeting Information
Meeting: Lunar Science Conference
Location: Houston, TX
Start Date: January 10, 1972
End Date: January 13, 1972
Accession Number
73A19839
Funding Number(s)
CONTRACT_GRANT: NSR-09-051-001
Distribution Limits
Public
Copyright
Other

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