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Did diogenites form from diogenites?: A case of Yamato diogenites Masuda, Akimasa Nakamura, Noboru Shimizu, Hiroshi Tanaka, Tsuyoshi P(論文) It has been found that the REE distribution in Y-74010 is considerably different between two adjacent fragments, sizes of which are at least 500mg, a fact indicative of patchy heterogeneity. In addition, it is worthwhile to note that the abundance ratios between two fragments in question are a linear function of atomic number. On the other hand, Y-74013 can be interpreted as a mixture of two distinct constituents, i.e., relatively coarse-grained pyroxene and much finer pyroxenic remnant component. It is noted that these two constituents of Y-74013 can correspond to two different kinds of parts represented by macroscopically separated patches of Y-74010 mentioned above. These observations coupled with the basically linear abundance ratios relative to atomic number suggest that (1) intense melting took place for a parental body of the Yamato diogenites, (2) two separate components reflect the coexisting solid and liquid phases and (3) the solid phase was formed from liquid, transiently as a low-Ca clinopyroxene, which subsequently changed into orthopyroxene as a finally stable form. Also it is an interesting fact that the apparent REE partition function pertaining to Y-692 appears to show discrete (quantum-like) effect. 1981-12 eng departmental bulletin paper https://nipr.repo.nii.ac.jp/records/1206 AA00733561 Memoirs of National Institute of Polar Research. Special issue 20 100 105 https://nipr.repo.nii.ac.jp/record/1206/files/KJ00000011732.pdf application/pdf 778.8 kB 1981-12-01