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    National Tsing Hua University Institutional Repository > 歷任校長 > 沈君山 (1994-1997) > 會議論文 >  Re-Os Diffusion into Massive Schreibersite and Possible Internal Isochrons for Iron Meteorites


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/80829


    Title: Re-Os Diffusion into Massive Schreibersite and Possible Internal Isochrons for Iron Meteorites
    Authors: D.A. Papanastassiou;G.J. Wasserburg;J.J. Shen
    教師: 沈君山
    Date: 1996
    Publisher: Lunar and Planetary Institute (LPI)
    Relation: 27th Lunar and Planetary Science Conference, March 18-22, 1996, Pages 993-994
    Keywords: CHRONOLGY
    RHENIUM-OSMIUM
    METEORITES
    IRON
    SCHREIBERSITE
    Abstract: For age determinations it is essential to obtain a reasonable range of parent-daughter physical-chemical fractionation between whole rock samples for the determination of whole rock isochrons, and between constituent phases for the possible determination of internal isochrons. For the application of Re-Os to iron meteorite evolution, the stages of evolution which can, in principle, result in Re-Os fractionation include: (a) condensation of PGE and of FeNi in the solar nebula; (b) subsequent oxidation of part of the Fe by reaction with S; (c) segregation of massive FeS during melting on parent planetesimals; (d) melting and fractional crystallization of the metal phase; (e) element redistribution during subsolidus phase transformations, including the precipitation and exsolution of schreibersite. Shen et al. have reported on analytical techniques which yield replicate analyses of Re-Os which are in good agreement, within +/-2.5 per mil. For whole samples of iron meteorites the results show a well defined correlation line on a ^187Re-^187Os evolution diagram for iron meteorites from groups IA, IIA, IIIA, IVA, and IVB, taken together. This correlation line yields a slope of 0.07848 +/- 0.00018 (2 sigma) and initial ^187Os/^188Os = 0.09563 0.00011 (2 sigma). The corresponding age is 4.61 +/- 0.01 AE using lambda (^187Re = 1.64 x 10^-11 a^-1). Re-Os data on sulphides from two iron meteorites (Group IA) show that the sulphides are extremely depleted in Re and Os. These workers concluded that sulphide formation and segregation, in the presence of FeNi, does not affect the Re-Os system (except as a diluent) and that sulphide is not useful for the possible determination of internal isochrons.
    Relation Link: http://adsabs.harvard.edu/full/1996LPI....27..993P
    http://www.lpi.usra.edu/
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/80829
    Appears in Collections:[沈君山 (1994-1997)] 會議論文
    [物理系] 會議論文

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