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首页> 外文期刊>Planetary and space science >The noble gases in five ordinary chondrites from Grove Mountains in Antarctica
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The noble gases in five ordinary chondrites from Grove Mountains in Antarctica

机译：来自南极洲的树丛山的五个普通普通普通蛋白质中的惰性气体

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摘要

Here we present the abundances and isotopic compositions of the noble gases He, Ne, Ar, Kr, and Xe in five bulk ordinary chondrites from Antarctica, namely Grove Mountains (GRV)054472, GRV053690, GRV022403, GRV023149, and GRV052243. The cosmic ray exposure (CRE) ages of the three H chondrites GRV054472 (H3), GRV053690 (H4), and GRV022403 (H4) are 3.8 +/- 0.3 Ma, 5.9 +/- 0.4 Ma, and 16.6 +/- 1.5 Ma, respectively. This finding is consistent with peaks in the exposure age histogram for H chondrites 4 Ma and 7.2 Ma, respectively and also with the broad age cluster M 15-20 Ma, which is especially pronounced for H4 chondrites. The two L6 chondrites GRV023149 and GRV052243 are most likely paired with consistent exposure ages of 17.4 +/- 1.1 Ma and 17.6 +/- 1.5 Ma that both fall into the peak M 15 Ma for L6 chondrites. The two meteorites GRV054472 and GRV053690 show significant He-3 or H-3 diffusive losses of about 10% and 20-30%, respectively. The He-4 gas retention ages for the three H chondrites are in the range 1.09-3.18 Ga, showing different degrees of degassing either M a thermal event on the parent body or during cosmic ray exposure after the ejection from the parent body. The low gas retention ages for the two L6 chondrites based on (U-Th)/He systematics are 259 Ma (mean age of two aliquots) and 320 Ma or 364 Ma (mean age of two aliquots) and 307 Ma based on K-Ar system. These ages indicate significant gas loss during the catastrophic break-up of the L-chondrite parent body. Trapped Kr in GRV054472 and GRV053690-2 is almost pure Kr-Q. In addition, other meteorites also contain Q as trapped Kr, but have discernable cosmogenic Kr. The excess Kr-82 observed in GRV052243 and GRV022403 is due to the neutron capture on Br-81. Radiogenic Xe-129* from the decay of I-129 was observed in all studied chondrites. Measured Xe isotopes in all the studied chondrites predominantly shows Q component with minor contributions from the terrestrial atmosphere. For the samples GRV053690-2 and GRV023149-2, measured Xe falls on a mixing line with Xe-SW and Xe-HL, although the later component contributes very little.
机译：在这里，我们将贵族气体的丰富和同位素组成，从南极的五种散装普通的软骨内，即树丛山（GRV）054472，GRV053690，GRV02403，GRV023149和GRV052243中的惰性气体普通的普通软骨。三个H Chondrites GRV054472（H3），GRV053690（H4）和GRV022403（H4）的宇宙射线暴露（CRE）年龄为3.8 +/- 0.3 mA，5.9 +/- 0.4 mA，16.6 +/- 1.5 mA ， 分别。该发现与H Chondrites 4 mA和7.2 mA的曝光年龄直方图的峰值一致，并且还与宽的年龄簇M 15-20mA，这对H4 Chondrites特别明显。两种L6 Chondrites GRV023149和GRV052243很可能与17.4 +/- 1.1 mA和17.6 +/- 1.5 mA的一致暴露率配对，其均落入L6 Chondrites的峰值M 15 mA。这两种陨石GRV054472和GRV053690分别显示出大约10％和20-30％的HE-3或H-3扩散损失。三个H Chondrites的HE-4气体保留年龄在1.09-3.18AG的范围内，显示出在父母身体上的父母身体上的热事件或在从父体身体喷射后的宇宙射线暴露时显示不同程度的脱气。基于（U-TH）/ He系统的两种L6 Chondrites的低气体保留年龄为259 mA（两个等分试样的平均年龄）和320mA或364mA（平均年龄为两次等分试样）和307 mA基于K-系统。这些年龄在L-Chondrite父母身体的灾难性分解期间表明了显着的气体损失。 GRV054472和GRV053690-2中的被捕获的KR几乎是纯kr-q。此外，其他陨石也含有Q作为被捕获的KR，但具有可辨别的宇宙内kr。在GRV052243和GRV022403中观察到的过量KR-82是由于BR-81上的中子捕获。在所有研究的Chondrites中观察到来自I-129衰减的辐射XE-129 *。在所有研究中测量的Xe同位素主要显示出Q组分，具有来自陆地气氛的轻微贡献。对于样品GRV053690-2和GRV023149-2，测量的XE落在与XE-SW和XE-HL的混合线上，尽管后来的组分贡献很少。

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  • 来源
    《Planetary and space science》 |2020年第11期|62-71|共10页
  • 作者

    Wang Ying; He Huaiyu; Leya Ingo; Ranjith P. M.; Su Fei; Stephenson P. C.; Zhang Chuantong; Zheng Dewen;

  • 作者单位

    China Earthquake Adm State Key Lab Earthquake Dynam Inst Geol Yard 1 Beijing 100029 Peoples R China;

    Chinese Acad Sci Inst Geol & Geophys State Key Lab Lithospher Evolut Beijing 100029 Peoples R China;

    Univ Bern Phys Inst Space Sci & Planetol Bern Switzerland;

    Chinese Acad Sci Inst Geol & Geophys State Key Lab Lithospher Evolut Beijing 100029 Peoples R China;

    Chinese Acad Sci Inst Geol & Geophys State Key Lab Lithospher Evolut Beijing 100029 Peoples R China;

    Univ Bern Phys Inst Space Sci & Planetol Bern Switzerland|Lawrence Livermore Natl Lab Nucl & Chem Sci Div Livermore CA 94551 USA;

    Guilin Univ Technol Key Lab Planetary Geol Evolut Guilin 541004 Peoples R China|Guilin Univ Technol Inst Meteorites & Planetary Mat Res Guilin 541004 Peoples R China;

    Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Isotope Geochem Guangzhou 510640 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Noble gases; Ordinary chondrites; Grove mountains; Cosmic ray exposure ages; Gas retention ages;

    机译：惰性气体;普通的chondrites;树林山;宇宙射线曝光年龄;气体保留年龄;

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