Ca-Al-Fe-rich inclusion in the Vigarano CV3 chondrite

Details Ca-Al-Fe-rich inclusion in the Vigarano CV3 chondrite Ca-Al-Fe-rich inclusion in the Vigarano CV3 chondrite

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011m%26ps...46..690m&link_type=abstract

Meteoritics & Planetary Science, Volume 46, Issue 5, pp. 690-700.

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Scientific paper

An anomalous Ca-Al-Fe-rich spherical inclusion (CAFI) was found in the Vigarano CV3 chondrite. The CAFI has an igneous texture and contains large amounts of almost pure and coarse-grained hercynite grains (approximately 56 vol%) as well as refractory phases such as grossite and perovskite. However, melilite and Mg-spinel, which are common in ordinary Ca-Al-rich inclusions, are very rare (<1 vol%). Another unique characteristic of the CAFI is the presence in its core of dmitryivanovite (CaAl2O4), which was formed by shock metamorphism of a low-pressure form of CaAl2O4 that was originally crystallized from a molten droplet. The fine-grained hercynite and unidentified aluminous phase in the rim of the CAFI may have been produced from grossite during aqueous alteration in the Vigarano parent body.

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