The Nilpena ureilite, an unusual polymict breccia - Implications for origin

Details The Nilpena ureilite, an unusual polymict breccia - Implications for origin The Nilpena ureilite, an unusual polymict breccia - Implications for origin

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46..893j&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, June 1982, p. 893-900.

Computer Science

12

Breccia, Meteoritic Composition, Mineralogy, Petrology, Ureilites, Carbonaceous Chondrites, Enstatite, Fusion (Melting), Olivine, Trace Elements, Meteorites, Nilpena Meteorite, Ureilites, Polymict Breccias, Origin, Characteristics, Mineralogy, Petrology, Photomicrographs, Aggregates, Matrix, Texture, Formation, Differentiation, Abundance, Enrichment, Lithopile Elements, Partial Melting, Composition, Electron Microprobe, Clasts, Fragments, Trace Elements, Rare Earth Elements, Barium, Features, Dingo Pup Dong

Scientific paper

The polymineralic aggregates of the Nilpena ureilite consist of equigranular-textured olivine and pigeonite, and exhibit evidence of shock in the form of undulose extinction and kink-banding. Monomineralic fragments consist of olivine and pigeonite, and appear to be derived by brecciation of the polymineralic aggregates. The enclave material consists of fragments of lithic granular olivine, porphyritic enstatite, olivine-clinobronzite, and eucrite-like lithic fragments. The matrix contains kamacite, scheibersite and troilite. The texture of Nilpena suggests formation by disruption of an olivine-pigeonite granular aggregate, while the presence of the diverse chondritic and achondritic enclave material suggests an origin as a surface or near-surface breccia. In light of Nilpena's enrichment in Ba and light rare earth elements, a cumulative origin seems plausible.

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