Other
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979gecoa..43.1663h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 43, Oct. 1979, p. 1663-1665, 1667-1673.
Other
11
Achondrites, Breccia, Meteoritic Composition, Petrology, Cobalt, Melts (Crystal Growth), Metal Crystals, Nickel, Troilite, Meteorites, Howardites, Composition, Origin, Metals, Nickel, Grains, Melts, Rocks, Matrix, Nickel/Cobalt, Element Ratios, Breccias, Analysis, Clasts, Data, Crystals, Textures, Phosphorus, Contamination, Metamorphism, Thermal History
Scientific paper
The metal compositions of howardite breccias are examined and the significance of variations in metal content to meteorite origins is discussed. It is shown that metals in howardites are found primarily in Ni-poor components, associated with primary clasts and similar in composition to pristine lunar anorthosite metal, and in Ni-rich grains, associated with glassy melt rocks and possibly derived from the projectiles which caused the melting. Variations in primary clast metal compositions among the howardite and the identities of matrix and clast metal contents within many howardites suggest that each howardite is derived from a distinct source region. Evidence of thermal metamorphism in Petersburg is interpreted as the results of deeper burial than in other howardites.
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