NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
A unique, (almost) unaltered spinel-rich fine-grained inclusion in KainsazA unique, spinel-rich, extremely porous fine-grained inclusion in the Kainsaz (CO3) meteorite is reported. This inclusion is the least altered fine-grained inclusion yet discovered, having escaped almost entirely the secondary alterations experienced by Allende fine-grained inclusions. The inclusion is comprised of loosely packed 5-30 microns spinel grains mantled by thin layers of melilite, anorthite, and diopsidic pyroxene. The inclusion, which has over 30 vol pct void space, is one of the most spinel-rich, most porous fine-grained inclusions seen to date. The mineralogy of the inclusion matches that which has been predicted for a precursor of the altered mineral assemblages of Allende fine-grained inclusions, though a lack of interstitial material in the Kainsaz inclusion reduces the likelihood of a direct genetic relationship between the two (Allende fine-grained inclusions contain abundant interstitial material). Its mineralogical composition confirms that the precursors of other, more altered, fine-grained inclusions were assemblages of refractory minerals exclusively.
Document ID
19920063680
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Holmberg, B. B.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Hashimoto, A.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
August 15, 2013
Publication Date
June 1, 1992
Publication Information
Publication: Meteoritics
Volume: 27
Issue: 2 Ju
ISSN: 0026-1114
Subject Category
Lunar And Planetary Exploration
Accession Number
92A46304
Funding Number(s)
CONTRACT_GRANT: NAG9-28
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available