Constraining the mass-dependent Ti isotope composition of the chondritic reservoir – An inter-laboratory comparison study
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2024-05-01
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Journal Article
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Abstract
Titanium isotopes are a promising tracer for planetary differentiation processes. The application of this tracer is, however, currently hampered by the lack of a robust estimate for the chondritic reservoir. Here, we conducted an inter-comparison Ti isotope study of three laboratories with the aim of providing an accurate and precise estimate for the chondritic reservoir. While previous estimates may suffer from heterogeneities on the sampling scale, we chose ordinary chondrites to minimise uncertainties associated with the necessary corrections for nucleosynthetic isotope variations in chondrites, and to allow the analysis of sufficiently large sample sizes representative for bulk meteorites. Titanium isotope data reported by the different laboratories are in good agreement with each other. Ordinary chondrites of different subgroups (H, L, LL) and petrologic types (3–6) display identical Ti isotope compositions within uncertainties (average δ⁴⁹Ti = +0.023 ± 0.009 ‰, 2SE, n = 20; permille deviation of ⁴⁹Ti/⁴⁷Ti from the OL-Ti standard). The average Ti isotope composition of ordinary chondrites is within 2SE identical to that of OIBs (+0.029 ± 0.005 ‰, 2SE, n = 52) and all pre 2.7 Ga mafic and komatiitic rocks (+0.019 ± 0.006 ‰, 2SE, n = 58), indicating that the δ⁴⁹Ti values of the bulk silicate Earth and ordinary chondrites are indistinguishable. Furthermore, our average Ti isotope composition of ordinary chondrites overlaps with those of the Moon, Mars and Vesta, suggesting a homogeneous inner Solar System in terms of mass-dependent Ti isotopes.
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published
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Volume
372
Pages / Article No.
171 - 180
Publisher
Elsevier
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Subject
Titanium isotopes; Mass-dependent isotope fractionation; Chondritic reservoir; Bulk silicate Earth; Inter-laboratory comparison
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03946 - Schönbächler, Maria / Schönbächler, Maria
03946 - Schönbächler, Maria / Schönbächler, Maria
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Funding
179129 - Tracking planet formation, differentiation and the moon-forming giant impact: an integrated approach using non-traditional stable isotopes (SNF)
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