Origin of polymict breccias on asteroids deduced from their pyroxene fragments

Details Origin of polymict breccias on asteroids deduced from their pyroxene fragments Origin of polymict breccias on asteroids deduced from their pyroxene fragments

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999m%26ps...34..271s&link_type=abstract

Meteoritics & Planetary Science, vol. 34, no. 2, pp. 271-283 (1999).

Computer Science

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Scientific paper

Cumulate eucrite, noncumulate eucrite, and diogenite meteorites are considered to have come from the crust of one (or similar) parent asteroids. Howardites are regarded as regolith breccias of eucrites and diogenites, and polymict eucrites are regarded as polymict breccias of eucrites. These polymict breccias show many textural and chemical features. In order to gain a better understanding of the origin of polymict breccias and the origin of their components, we investigated four polymict breccias, Yamato(Y)791439, Y791192, Y82009 and Y82049 by a SEM equipped with a chemical mapping system and by electron probe microanalysis (EPMA). We analyzed all pyroxene grains with chemical maps, classified them by chemical composition, and observed their chemistry and mineralogy in detail. The characteristics of pyroxenes suggest that the polymict breccias were generated by gathering locally ordinary eucrites and cumulate eucrites. The chemical-evolutionary features of the pyroxenes, such as homogenization, chemical zoning, and exsolution lamellae, suggest that there were at least two long annealing events and one short (or low temperature) annealing event separated by mixing events. Local heterogeneity on the asteroidal crust is also suggested.

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