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Chemical and physical studies of type 3 chondrites. VII - Annealing studies of the Dhajala H3.8 chondrite and the thermal history of chondrules and chondritesSamples of the Dhajala meteorite were annealed at 600-1000 C for 1, 2, 10, 20 and 100 h and their thermoluminescence (TL) properties were measured. After annealing at less than 900 deg, the TL sensitivity decreased by a factor of two; at higher temperatures, it fell by an order of magnitude. Data indicate that the annealing treatment caused the low-temperature feldspar in Dhajala to be converted to feldspar of a high-temperature (disordered) form. Low-temperature feldspar was found in the meteorite's TL-sensitive chondrules which comprised about 20 percent of those separated. It is suggested that these chondrules suffered greater crystallization of their mesostasis than the other chondrules, and equilibrated to lower temperatures. Based on TL data, there appears to be no relationship between post-metamorphic cooling rate and petrologic type for the 3.5-3.9 chondrites.
Document ID
19860053228
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Keck, B. D.
(Arkansas Univ. Fayetteville, AR, United States)
Guimon, R. K.
(Arkansas Univ. Fayetteville, AR, United States)
Sears, D. W. G.
(Arkansas, University Fayetteville, United States)
Date Acquired
August 12, 2013
Publication Date
April 1, 1986
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 77
Issue: 3-4
ISSN: 0012-821X
Subject Category
Lunar And Planetary Exploration
Accession Number
86A37966
Funding Number(s)
CONTRACT_GRANT: NAG9-81
Distribution Limits
Public
Copyright
Other

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