Not all eucrites are monomict breccias

Details Not all eucrites are monomict breccias Not all eucrites are monomict breccias

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1601y&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 601.

Mathematics

Logic

1

Meteoritic Composition, Breccia, Petrology, Basalt, Pyroxenes, Minerals, Petrogenesis

Scientific paper

We have made a petrologic study of two PTSs of the meteorite Sioux County and conclude that it is a typical fragmental polymict breccia, composed of coarse- to very fine-grained basaltic clasts, breccia clasts, and mineral fragments. Three types of pigeonite (type 4, 5, and 6), plus orthopyroxene, and augite are present. One clast contains large orthopyroxene grains with blebby augites, which might be a fragment of a cumulate eucrite. We did not find any diogenitic and other exotic components. This suggests that Sioux County is a mixture of several kinds of equilibrated eucritic components. We conclude that this polymict eucrite experienced both metamorphism and multistage impact events. The lesson from Sioux County is that almost all eucrites are metamorphic rocks and/or breccias, and the pristinity of eucrites should be reexamined carefully before using them as a representative magma type.

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