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Noble gas and oxygen isotope studies of aubrites : a clue to origin and histories

https://hiroshima.repo.nii.ac.jp/records/2006928
https://hiroshima.repo.nii.ac.jp/records/2006928
56041771-bdc7-4aa8-96f9-106cfbbc50a1
名前 / ファイル ライセンス アクション
GCA_71_251.pdf GCA_71_251.pdf (506.5 KB)
Item type デフォルトアイテムタイプ_(フル)(1)
公開日 2023-03-18
タイトル
タイトル Noble gas and oxygen isotope studies of aubrites : a clue to origin and histories
言語 en
作成者 Miura, Yayoi N.

× Miura, Yayoi N.

en Miura, Yayoi N.

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Hidaka, Hiroshi

× Hidaka, Hiroshi

en Hidaka, Hiroshi

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Nishiizumi, Kunihiko

× Nishiizumi, Kunihiko

en Nishiizumi, Kunihiko

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Kusakabe, Minoru

× Kusakabe, Minoru

en Kusakabe, Minoru

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アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利情報
権利情報 Copyright (c) 2007 Elsevier Ltd.
主題
主題Scheme NDC
主題 450
内容記述
内容記述 Noble gas measurements were performed for nine aubrites: Bishopville, Cumberland Falls, Mayo Belwa, Mt. Egerton, Norton County, Pena Blanca Spring, Shallowater, ALHA 78113 and LAP 02233. These data clarify the origins and histories, particularly cosmic-ray exposure and regolith histories, of the aubrites and their parent body(ies). Accurate cosmic-ray exposure ages were obtained using the 81Kr-Kr method for three meteorites: 52 ± 3, 49 ± 10 and 117 ± 14 Ma for Bishopville, Cumberland Falls and Mayo Belwa, respectively. Mayo Belwa shows the longest cosmic-ray exposure age determined by the 81Kr-Kr method so far, close to the age of 121 Ma for Norton County. These are the longest ages among stony meteorites. Distribution of cosmic-ray exposure ages of aubrites implies 4-9 break-up events (except anomalous aubrites) on the parent body. Six aubrites show “exposure at the surface" on their parent body(ies): (i) neutron capture 36Ar, 80Kr, 82Kr and/or 128Xe probably produced on the respective parent body (Bishopville, Cumberland Falls, Mayo Belwa, Pena Blanca Spring, Shallowater and ALHA 78113); and/or (ii) chondritic trapped noble gases, which were likely released from chondritic inclusions preserved in the aubrite hosts (Cumberland Falls, Pena Blanca Spring and ALHA 78113). The concentrations of 128Xe from neutron capture on 127I vary among four measured specimens of Cumberland Falls (0.5-76 × 10-14 cm3STP/g), but are correlated with those of radiogenic 129Xe, implying that the concentrations of (128Xe)n and (129Xe)rad reflect variable abundances of iodine among specimens. The ratios of (128Xe)n/(129Xe)rad obtained in this work are different for Mayo Belwa (0.045), Cumberland Falls (0.015), and Shallowater (0.001), meaning that neutron fluences, radiogenic 129Xe retention ages, or both, are different among these aubrites. Shallowater contains abundant trapped Ar, Kr and Xe (2.2 × 10-7, 9.4 × 10-10 and 2.8 × 10-10 cm3STP/g, respectively) as reported previously (Busemann and Eugster, 2005, MAPS 37, 1865-189
言語 en
出版者
出版者 Elsevier
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 journal article
出版タイプ
出版タイプ AO
出版タイプResource http://purl.org/coar/version/c_b1a7d7d4d402bcce
関連情報
識別子タイプ DOI
関連識別子 10.1016/j.gca.2006.07.040
関連情報
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 http://dx.doi.org/10.1016/j.gca.2006.07.040
収録物識別子
収録物識別子タイプ ISSN
収録物識別子 0016-7037
収録物識別子
収録物識別子タイプ NCID
収録物識別子 AA00655038
開始ページ
開始ページ 251
書誌情報 Geochimica et Cosmochimica Acta
Geochimica et Cosmochimica Acta

巻 71, 号 1, p. 251-270, 発行日 2007-01-01
旧ID 17076
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