REE adundances and Rb-Sr geochronology of Yamato-791197

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The REE abundances and the Sr isotopic compositions were determined for the separated samples and the clast sample of the "lunar meteorite", Yamato-791197. Most of the features of the REE patterns are similar to those of the lunar highland samples, especially a kind of anorthosites. And the positive Ce-anomalies, shown in all REE patterns, appear characteristic of the lunar origin. The age obtained from the Rb-Sr system is 3.89±0.36 b. y. and it is considered that this age shows the time when these materials underwent an event, such as brecciation or impact melting. However, as a noticeable point, the initial ^<87>Sr/^<86>Sr is significantly low, even lower than BABI or LUNI. This result suggests that the source material of these samples might have had very low ^<87>Sr/^<86>Sr and Rb/Sr abundance ratios. The clast sample from the chip subordinate No. 109 has the distinct REE pattern and Sr-isotope ratio. Therefore, this clast can be considered to have been formed by different evolution process from the other samples, and was mingled later with them.

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  • Memoirs of National Institute of Polar Research. Special issue

    Memoirs of National Institute of Polar Research. Special issue 41, 96-105, 1986-07

    国立極地研究所

各種コード

  • NII論文ID(NAID)
    110000010102
  • NII書誌ID(NCID)
    AA00733561
  • 本文言語コード
    ENG
  • ISSN
    03860744
  • データ提供元
    NII-ELS 
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