40Ar-39Ar analyses of a lumar meteorite (Yamato-86032) and a few LL3 and LL4 chondrites from Antarctica
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- Kaneoka Ichiro
- Earthquake Research Institute, University of Tokyo
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- Nagao Keisuke
- Institute for Study of Earth's Interior, Okayama University
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Abstract
^<40>Ar-^<39>Ar analyses were performed for a lunar meteorite (Yamato-86032), two LL3 (Y-790448,Allan Hills-764) and one LL4 (Y-74442) chondrites from Antarctica. The lunar meteorite Y-86032 shows a scattered ^<40>Ar-^<39>Ar age spectrum with anomalously high ages in the higher temperature fractions, indicating a shock effect on the analyzed sample. Among the three LL chondrites analyzed, the sample Y-790448 indicates a plateau ^<40>Ar-^<39>Ar age of 4521±28Ma in the lower temperature fractions (600-800℃). The other two LL chondrites show inverse staircase spectra in the higher temperature fractions. In the LL chondrite group, un-equilibrated chondrites seem to show older ^<40>Ar-^<39>Ar ages compared with equilibrated ones, which may be related to the differences in the thermal history of each portion of their parent body.
Journal
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- Proceedings of the NIPR Symposium on Antarctic Meteorites
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Proceedings of the NIPR Symposium on Antarctic Meteorites 6 88-99, 1993-05
National Institute of Polar Research
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Details
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- CRID
- 1570854176796732672
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- NII Article ID
- 110000029971
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- NII Book ID
- AA10784627
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- ISSN
- 09145621
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- Text Lang
- en
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- Data Source
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- CiNii Articles