Computer Science
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998m%26ps...33..435l&link_type=abstract
Meteoritics & Planetary Science, vol. 33, no. 2, pages 435-446.
Computer Science
12
Scientific paper
Many Ca-Al-rich inclusions were once-molten, and the question of what their precursors consisted of is controversial. In this paper, we report a new type of Anorthite-Spinel-rich inclusion (ASI) in the Ningqiang carbonaceous chondrite. The modal and bulk compositions of the ASIs are similar to those of Type C inclusions, but with non-molten textures. The ASIs are proposed to be the precursors of Type C inclusions. The ASIs show alteration textures, with melilite being replaced by anorthite and Ca-pyroxene. Furthermore, compositions of the melilites and the calculated modal and bulk compositions of the possible precursors of the ASIs are close to those of the spinel-rich Type A inclusions in the Ningqiang meteorite, suggesting that ASIs formed by alteration of the latter in the solar nebula. Petrography and mineral chemistry of one Type C inclusion in Ningqiang are also reported.
Kimura Masahiro
Lin Yangtin
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