@article{oai:nipr.repo.nii.ac.jp:00005978,
 author = {Ikeda,Yukio and Prinz,M. and Nehru,C.E.},
 journal = {Antarctic meteorite research},
 month = {Mar},
 note = {P(論文), Essentially all of the lithic and mineral clasts in DAG 319,a new polymict ureilite, were studied in order to determine their petrographic and mineralogical characteristics and their petrologic relationships to one another. Most of the clasts are identifiably from the ureilite parent body or appear to be shock-modified clasts from that body. Others appear to be projectiles derived from other bodies. The many kinds of lithic and mineral clasts found were classified into seven major groups, from A to G. The coarse-grained mafic lithic clasts (A) include three types of ureilitic lithology : type I ureilites, the predominant type, are similar to the common monomict ureilites; type II ureilites are a rare type with an olivine-orthopyroxene-augite lithology with essentially no carbon, and contain magmatic inclusions in the olivines and orthopyroxenes (similar to those in the Hughes 009 ureilite); a third type are magnesian ureilites with an mg >0.90,which are shock-produced. Fine-grained mafic lithic clasts (B) may have been derived from typical ureilites by shock, recrystallization, reduction, and/or melting. Felsic lithic clasts (C) are rare and important plagioclase-bearing igneous lithologies, which may represent the so-called missing basaltic melts separated during the formation of the ureilites. These represent several different lithic components. Dark clasts (D) consist mainly of phyllosilicates and sulfides, as well as magnetite (sometimes as framboidal clusters) and carbonates (dolomite, magnesite); some phyllosilicates occur as veins. Sulfide or metal-rich clasts (E) are shock-related, fine-grained lithologies to which sulfide and/or metal has been added; metal-rich clasts may have formed by reduction, and sulfide-rich clasts by oxidation. Rare chondrules and chondritic fragments (F) may be from projectiles which collided with the DAG 319 parent body, and they have characteristics that are more closely related to ordinary than to carbonaceous chondrites. Isolated mineral clasts (G) include many kinds of minerals produced by disaggregation of lithic clasts, but the origin of some of these minerals is uncertain. This paper describes all of these clasts, and is intended as a comprehensive study of the petrologic and mineralogical features of polymict ureilites. Such a description is a necessary prelude to a more complete understanding of the origin of the ureilitic meteorites.},
 pages = {177--221},
 title = {Lithic and mineral clasts in the Dar Al Gani (DAG) 319 polymict ureilite},
 volume = {13},
 year = {2000}
}