A new hypothesis for the origin of diamonds in ureilite and its experimental evidence

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  • MATSUDA Jun-ichi
    Department of Earth and Space Science, Faculty of Science, Osaka University

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Other Title
  • ユレイライト中のダイヤモンドの新成因説とその実験的検証 (1992年度日本地球化学会賞受賞記念)
  • ユレイライトチュウ ノ ダイヤモンド ノ シン セイインセツ ト ソノ ジッケ

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Abstract

We synthesized vapor-growth diamonds and shock-produced diamonds, and examined elemental abundances and isotopic compositions of noble gases in them. The trapping mechanism of noble gases in these synthetic diamonds has been verified from this study. We have examined various features of diamonds in ureilites and compared with those in synthetic diamonds, and concluded that the vapor-growth hypothesis is better than the impact-shock hypothesis for the origin of diamonds in ureilites. The diamond (and graphite, amorphous carbon, too) have been deposited on early condensate such as Re, Ir, W etc. in the primitive solar nebula, which explains the chemical features of vein material in ureilites. The vapor-growth model shows that nebular processes are primarily responsible for the chemical composition of ureilites.

Journal

  • Chikyukagaku

    Chikyukagaku 27 (2), 141-160, 1993

    The Geochemical Society of Japan

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