| Summary: | P(論文) An inclusion in ALH-77004 (H4 chondrite) consists of four different constituents with varying degree of recrystallization; (1) moderately to highly recrystallized lithic and chondrule fragments (fayalite-rich group), (2) unequilibrated chondrules (fayalite-poor group), (3) fine-grained dark clastic matrix, and (4) particles of Fe-Ni metal, troilite, and chromite. From petrological examinations of these constituents, it is suggested that the inclusion was a surface regolith of the L chondrite parent body formed by repetitive impact cratering processes extended to various depths of the body. departmental bulletin paper
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