@article{oai:nipr.repo.nii.ac.jp:00010198,
 author = {Shin, Ozawa and Masaaki, Miyahara and Eiji, Ohtani and Makoto, Kimura and Yoshinori, Ito and Shin, Ozawa and Masaaki, Miyahara and Eiji, Ohtani and Makoto, Kimura and Yoshinori, Ito},
 issue = {4},
 journal = {Polar science, Polar science},
 month = {Jan},
 note = {Yamato 984028 (Y984028) is a newly identified lherzolitic shergottite, recovered from the Yamato Mountains, Antarctica, in 1999. As part of a consortium study, we conducted petrographic observations of Y984028 and its melt vein in order to investigate its shock metamorphism. The rock displays the typical non-poikilitic texture of lherzolitic shergottite, characterized by a framework of olivine, minor pyroxene (pigeonite and augite), and interstitial maskelynite. Shock metamorphic features include irregular fractures in olivine and pyroxene, shock-induced twin-lamellae in pyroxene, and the complete conversion of plagioclase to maskelynite, features consistent with those found in other lherzolitic shergottites. The melt vein is composed of coarse mineral fragments (mainly olivine) entrained in a matrix of fine-grained euhedral olivine (with several modes of compositional zoning) and interstitial glassy material. Some coarse olivine fragments consist of an assemblage of fine-grained euhedral to subhedral olivine crystals, suggesting shock-induced fragmentation, recrystallization, and/or a process of sintering. The implication is that the fine-grained olivine crystals in the matrix of the melt vein represent complicated crystallization environments and histories., レルゾライト質シャーゴッタイトYamato 984028 (Y984028) の岩石学的記載を行った。衝撃による変成組織として、鉱物中の不規則な割れ目、輝石の双晶ラメラ、斜長石のマスケリナイト化などが認められ、これらの特徴は他のレルゾライト質シャーゴッタイトと類似していた。また、Y984028には幅1.5 mm程度の溶融脈が含まれており、その内部は、粗粒の鉱物片（主にかんらん石）、細粒の自形かんらん石結晶、およびケイ酸塩ガラスで構成されていた。粗粒のかんらん石片は、より細粒のかんらん石結晶が多数集合した特異な組織を示しており、また、細粒・自形のかんらん石結晶には、複雑な結晶化過程を示唆する様々な種類・組成の累帯構造が認められた。},
 pages = {550--557},
 title = {Petrography of Yamato 984028 lherzolitic shergottite and its melt vein: Implications for its shock metamorphism and origin of the vein},
 volume = {4},
 year = {2011}
}