REE, Ba, Sr and Rb abundances in some unique Antarctic achondrites
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概要
- 論文の詳細を見る
Rare-earth elements (REE), Ba, Sr and Rb were determined for an Antarctic mesosiderite and seven Antarctic achondrites including some unique ones. The meteorite samples analyzed are Y-74450 (eucrite), Y-75032 (diogenite), ALH-77256 (diogenite), ALH-78113 (aubrite), Y-74123 (ureilite), ALH-77257 (ureilite), ALH-77005 (unique) and ALH-77219 (mesosiderite). A positive Ce anomaly (18%) is observed for Y-74450 eucrite. REE contents of Y-75032 and ALH-77256 diogenites are higher than those of Yamato recrystallized diogenites analyzed thus far. Particularly, in REE pattern of Y-75032 which is considered as intermediate between diogenites and eucrites, Leedey chondritenormalized values are 1.8-2.7. Two ureilites, Y-74123 and ALH-77257,show curved REE patterns similar to those of diogenites and inclinations of light REE slopes of these ureilites are more gentle than those observed in Kenna, Goalpara and Novo Urei ureilites. REE patterns of ALH-77219 mesosiderite and ALH-78113 aubrite are composed of some rectilinear lines, having some deviated points, respectively. Unique achondrite ALH-77005 shows an S-shaped REE pattern having positive Ce irregularity. The pattern of REE concentration ratios between ALH-77005 and Nakhla suggests a genetically intimate relationship between those two meteorites, indicative of coexisting solid-and-liquid relation.
- 国立極地研究所の論文
著者
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Shimizu Hiroshi
Department Of Bioinformatic Engineering Graduate School Of Information Science And Technology Osaka
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Masuda Akimasa
Department Of Chemistry Faculty Of Science The University Of Tokyo
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SHIMIZU HIROSHI
Department of Anatomy, School of Medicine, Tokushima University
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