A unique, (almost) unaltered spinel-rich fine-grained inclusion in Kainsaz

Details A unique, (almost) unaltered spinel-rich fine-grained inclusion in Kainsaz A unique, (almost) unaltered spinel-rich fine-grained inclusion in Kainsaz

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992metic..27..149h&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 27, no. 2, June 1992, p. 149-153.

Mathematics

Logic

4

Carbonaceous Chondrites, Inclusions, Meteoritic Composition, Spinel, Allende Meteorite, Meteoritic Microstructures, Pyroxenes

Scientific paper

A 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.

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