@article{oai:nipr.repo.nii.ac.jp:00004534, author = {Takeda, Hiroshi and Saito, Jun and Yanai, Keizo and Kojima, Hideyasu}, journal = {Proceedings of the NIPR Symposium on Antarctic Meteorites}, month = {Mar}, note = {P(論文), Yamato (Y)-793274 is a fragmental breccia with some regolith components and is rich in pyroxene fragments. Chemical variation of pyroxenes in Y-793274 can be interpreted in terms of chemical zoning similar to those found in a rare basaltic clast in Apollo 16 breccia, 60019. Some pyroxene fragments show thin exsolution lamellae. The most magnesian gabbroic clast found consists of nearly homogeneous olivine, plagioclase, and pigeonite with fine exsolution. Plagioclase fragments show much wider variation in An contents than other lunar meteorites. All these data indicate that Y-793274 is a regolith breccia with components suggestive of mare origin (or non-highland). The mare components are not always surficial basalts, and may be a coarse-grained rock similar to the basaltic clast with chemically zoned pyroxenes in 60019,which is different from the mare basalt samples collected by the Apollo missions.}, pages = {3--11}, title = {Consortium reports of lunar meteorite Yamato-793274}, volume = {4}, year = {1991} }