Titanium isotopes and the radial heterogeneity of the solar system

Maria Schonbachler, Ingo Leya, Maria Schönbächler, Uwe Wiechert, Urs Krähenbühl, Alex N. Halliday

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The solar system is assumed to be uniform on a large scale in terms of the isotope composition of refractory elements. Here we show that the titanium (Ti) isotope compositions of carbonaceous chondrites differ from those of ordinary chondrites, eucrites, mesosiderites, ureilites, the Earth, Moon, and Mars, all of which are indistinguishable. Leachates and mineral separates demonstrate that this feature is homogeneously distributed within a range of phases in the carbonaceous chondrites Allende and Renazzo. The data therefore indicate that the solar nebula that fed planetesimals between ∼ 1 AU and ∼ 2.4 AU, e.g. Earth, Moon, Mars and the parent bodies of ordinary chondrites, eucrites, ureilites, and mesosiderites, was homogeneous for Ti (and Sr, Ba, Nd, Sm) isotopes. In contrast, carbonaceous chondrites, which probably formed beyond ∼ 2.7 AU appear to have acquired a distinct mix of primitive components, which is consistent with their lack of depletion in volatile elements and late formation. © 2007 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)233-244
    Number of pages11
    JournalEarth and Planetary Science Letters
    Volume266
    Issue number3-4
    DOIs
    Publication statusPublished - 29 Feb 2008

    Keywords

    • early solar system
    • isotope heterogeneities
    • solar nebula
    • Ti-isotopes

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