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On the irradiation history and origin of gas-rich meteoritesTransmission electron microscope study of the track density gradients and irradiation geometries of track-rich grains and chondrules in sections of Fayetteville and Kapoeta, and in sections of lunar breccias and grains from lunar soil. A substantial fraction (50 to 90%) of the meteoritic track-rich grains and chondrules show evidence of having been irradiated anisotropically in their different faces, as would be expected for irradiation on the surface of a parent body. The observations thus support the hypothesis that the irradiation of these grains and chondrules took place on the regoliths of asteroidal-sized bodies. Measurements of steepest track density gradients indicate that, while there are finite differences between spectra exhibited by individual gas-rich meteorites, the average solar flare spectral shapes have been similar over the last 4 b.y. or so.
Document ID
19740047016
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Rajan, R. S.
(California, University Berkeley, Calif., United States)
Date Acquired
August 7, 2013
Publication Date
May 1, 1974
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 38
Subject Category
Space Sciences
Accession Number
74A29766
Funding Number(s)
CONTRACT_GRANT: NGL-05-003-410
Distribution Limits
Public
Copyright
Other

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