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Measuring metamorphic history of unequilibrated ordinary chondritesMeasurements performed by a thermoluminescence sensitivity technique of the degree of metamorphism experienced by unequilibrated ordinary chondrites are reported. Samples of type 3 chondrites were ground and heated to 500 C to remove their natural thermoluminescence, then irradiated with either 50 krad from a Co-60 gamma ray source or 25 krad from a Sr-90 beta source. The resulting thermoluminescence measured as a function of temperature is found to differ as much among some type 3 chondrites as between type 3 and other types, leading to the proposal of scheme for subdividing type 3 ordinary chondrites based on their thermoluminescence sensitivity.
Document ID
19810027148
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Sears, D. W.
(California Univ. Los Angeles, CA, United States)
Grossman, J. N.
(California, University Los Angeles, Calif., United States)
Melcher, C. L.
(California Univ. Los Angeles, CA, United States)
Ross, L. M.
(Washington University St. Louis, Mo., United States)
Mills, A. A.
(Leicester, University Leicester, United Kingdom)
Date Acquired
August 11, 2013
Publication Date
October 30, 1980
Publication Information
Publication: Nature
Volume: 287
Subject Category
Lunar And Planetary Exploration
Accession Number
81A11552
Funding Number(s)
CONTRACT_GRANT: NGR-05-007-329
CONTRACT_GRANT: NSF EAR-78-22440
Distribution Limits
Public
Copyright
Other

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