Gujba: A new Bencubbin-like meteorite fall from Nigeria

Gujba is a new Bencubbin-like meteorite fall enriched in N-15 and consisting (in vol.%) of 41% metal nodules, 20% large light-colored silicate nodules and 39% dark-colored, C- and silicate-rich matrix

Oxygen isotopic compositions of petrographically described inclusions from Antarctic unequilibrated ordinary chondrites

Several inclusions from the Antarctic unequilibrated ordinary chondrites (ALH-764 (LL3), ALH-77015 (L3) and Y-790448 (L3)) were excavated and their petrography, chemical and oxygen isotopic compositions were determined. The coherent data indicates that precursors of the ordinary chondrites consist of a mixture of two different solid materials. One is a pre-existing solid enriched in albite component and depleted in ^O component and the other is a solid depleted in albite component and enriched in ^O component. The latter solid material may be an evaporation residue of the former solid material in an ambient gas