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Yamato-793605: A new lherzolitic shergottite from the Japanese Antarctic meteorite collection
https://doi.org/10.15094/00005887
https://doi.org/10.15094/00005887b64c49ec-dc9a-4c85-bcf6-02043a93b562
名前 / ファイル | ライセンス | アクション |
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||||||
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公開日 | 1997-09-01 | |||||||||
タイトル | ||||||||||
タイトル | Yamato-793605: A new lherzolitic shergottite from the Japanese Antarctic meteorite collection | |||||||||
言語 | ||||||||||
言語 | eng | |||||||||
資源タイプ | ||||||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||
資源タイプ | departmental bulletin paper | |||||||||
ID登録 | ||||||||||
ID登録 | 10.15094/00005887 | |||||||||
ID登録タイプ | JaLC | |||||||||
ページ属性 | ||||||||||
内容記述タイプ | Other | |||||||||
内容記述 | P(論文) | |||||||||
著者名(英) |
Mikouchi,Takashi
× Mikouchi,Takashi
× Miyamoto,Masamichi
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著者所属(英) | ||||||||||
en | ||||||||||
Mineralogical Institute, Graduate School of Science, University of Tokyo/Mineralogical Institute, Graduate School of Science, University of Tokyo | ||||||||||
抄録(英) | ||||||||||
内容記述タイプ | Other | |||||||||
内容記述 | Y-793605 is a new martian meteorite from Antarctica that can be classified as a lherzolitic shergottite. Y-793605 mainly shows a poikilitic texture (large pyroxene oikocryst with enclosed olivine and chromite), but partly contains non-poikilitic areas (mainly maskelynite, olivine, and pigeonite). Olivine in the non-poikilitic area is more Fe-rich and shows a narrower compositional distribution than that in the poikilitic area. Low-Ca pyroxenes in the non-poikilitic area are also more Fe-rich (En_<65>Fs_<28>Wo_7∿En_<60>Fs_<27>Wo_<13>) than those in the poikilitic area (En_<76>Fs_<21>Wo_3∿En_<66>Fs_<23>Wo_<11>). Augites in the poikilitic area are usually present rimming the oikocrysts (En_<52>Fs_<16>Wo_<32> to En_<49>Fs_<14>Wo_<37>). The crystallization sequence of minerals in Y-793605 is considered to have begun by initial crystallization of cumulus phases (olivine and chromite) from the parent magma. Then, low-Ca pyroxenes and later augite poikilitically enclosed cumulus phases, and became a large oikocryst. Due to accumulation of phases, small interstitial melts formed between the oikocryst boundaries, and plagioclase crystallized from the Ca-Fe-rich melt along with pigeonite. After minor augite crystallization in the non-poikilitic area, all phases experienced re-equilibration (e. g., homogenization of olivine). Y-793605 shows a close relationship to previously known lherzolitic shergottites ALH77005 and LEW88516. Especially, olivine composition of Y-793605 is nearly identical to that of LEW88516. Pyroxene and maskelynite compositions are almost the same among these three meteorites. Although it is hardly possible to consider that Y-793605 is paired with ALH77005 or LEW88516 in the sense that Y-793605 was in the same fall with them, it can be concluded that Y-793605 originated from the same igneous body or rock in Mars as ALH77005 and LEW88516. | |||||||||
雑誌書誌ID | ||||||||||
収録物識別子タイプ | NCID | |||||||||
収録物識別子 | AA11182426 | |||||||||
書誌情報 |
Antarctic meteorite research 巻 10, p. 41-60, 発行日 1997-09 |
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出版者 | ||||||||||
出版者 | National Institute of Polar Research |