Niobium-Zirconium Chronometry and Early Solar System Development.

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    • Subject Terms:
      NIOBIUM; ZIRCONIUM; NUCLEOSYNTHESIS; SOLAR system
    • Abstract:
      Niobium-92 ([sup 92]Nb) decays to zirconium-92 ([sup 92]Zr) with a haft-life of 36 million years and can be used to place constraints on the site of p-process nucleosynthesis and the timing of early solar system processes. Recent results have suggested that the initial [sup 92]Nb/[sup 93]Nb of the solar system was high (>10[sup −3]). We report Nb-Zr internal isochrons for the ordinary chondrite Estacado (H6) and a clast of the mesosiderite Vaca Muerta, both of which define an initial [sup 92]Nb/ [sup 93]Nb ratio of ∼10[sup −5]. Therefore, the solar system appears to have staked with a ratio of <3 × 10[sup −5], which implies that Earth's initial differentiation need not have been as protracted as recently suggested. [ABSTRACT FROM AUTHOR]
    • Abstract:
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