Planetary-type rare gases in an upper mantle-derived amphibole |
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| Authors: | Kazuo Saito Asish R Basu E Calvin Alexander |
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| Institution: | Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455 U.S.A. |
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| Abstract: | All twenty-three stable rare gas isotopes have been measured in a mantle-derived amphibole, kaersutite. The elemental abundance pattern of the rare gases is similar to the “planetary” rare gas pattern as defined by carbonaceous chondrites. The3He/4He ratio, (4.9 ± 0.6) × 10?5, is suggestive of primordial He degassing from the mantle. Excess21Ne is present. The measured40Ar/36Ar ratio,400 ± 5, may represent a mantle40Ar/36Ar ratio <240 when corrected for radiogenic40Ar. The heavy isotopes of Kr and t0he Xe isotopes are within error of the atmosphere values. |
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