Investigation of the Weathering Effect on Rb-Sr Systematics and Trace Element Abundances in Antarctic and Non-Antarctic Meteorites--A Case of H-Chondrites (表面電離法による同位体比測定<特集>)
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概要
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In order to examine weathering effects on chondritic meteorites in Antarctic and non-Antarctic environments, the Rb-Sr isotopic ratios and abundances of REE, Ba, Sr, Rb, and K were determined for 8H-group chondrites (Yamato-790986 [H3], Yamato-74492 [H3], Grady [H3], Brownfield [H3], Clovis (No. 1) [H3], Yamato-74155 [H4], Allegan [H5] [one whole-rock and two chondrules], and Yamato-74371 [H5]), and partly for the Etter (L5) chondrite.The Allegan whole-rock shows a flat REE pattern with a large negative Eu anomaly and Sr depletion. Analyses of Rb-Sr systematics of one whole-rock and two chondrules show somewhat younger age 4.38±0.12 b.y. It is suggested that REE and Rb-Sr were redistributed during the early thermal metamorphism.Except for Allegan, most other H-chondrites (finds) show the perturbation of the Rb-Sr systematics, indicating recent loss of Rb. It was found that the weathering degree is related with the Rb-Sr disturbance in Antarctic H-chondrite. In spite of different degrees of weathering, all the Antarctic H-chondrites studied (including heavily weathered ones) show flat REE patterns normal as H-chondrite with occasional occurrence of minor Eu anomalies, indicating the tough resistance of REE in H-chondrites to the Antarctic weathering. On the other hand, non-Antarctic finds (particularly the weathered chondrites) indicate light-REE enriched patterns with a large negative Ce anomaly and extreme enrichment of Ba, suggestive of terrestrial contaminations.
- 日本質量分析学会の論文
著者
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KAGAMI Hiroo
Institute for Study of Earth's Interior, Okayama University
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Misawa Keiji
Department of Earth & Planetary Sciences, Faculty of Science, and Division of the Nature of the Eart
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Okano Osamu
Department Of Earth Sciences Okayama University
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Nakamura Noboru
Department Of Earth & Planetary Sciences Kobe University
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Nishikawa Yoshiyuki
Department Of Internal Medicine And Clinical Research National Shikoku Cancer Center Hospital
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Yamamoto Koshi
Department Of Earth And Environmental Sciences Graduate School Of Environmental Studies Nagoya Unive
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Misawa Keiji
Department of Earth Sciences, Faculty of Science, Kobe University
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Okano Osamu
Department of Earth Sciences, Faculty of Science, Kobe University
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