Busemann, H. and Eugster, O.
Plutonium-Xenon systematics of Angrites.
In: 66th Annual Meeting of the Meteoritical Society, 28 July - 1 August 2003, Munster, Germany.
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Introduction: Angrites are igneous meteorites that crystallized very early in the solar system, ~10 Ma after CAIs, as also implied by the presence of now extinct short-lived radionuclides such as 53Mn, 146Sm and 244Pu . Fission Xe was used to calculate 244Pu-136Xeretention ages of eucrites, relative to that of Angra dos Reis (AdoR) . AdoR has an absolute Pb-Pb age of 4557.8 Ma [see 1 for ref.]. Most eucrites, being as old as angrites, experienced various parent body processes leading to ages ranging from ~20 Ma before, to ~100 Ma after AdoR . Angrites, however, remained largely unaltered after differentiation. Here, we examine whether Xe isotopic characteristics
allow determining an age sequence for angrites.
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