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Millet, M.-A.; Dauphas, N.; Greberb, N.D.; Burton, K.W.; Dale, C.W.; Debret, B.; Macpherson, C.G.; Nowell, G.M.; Williams, H.M. (2016)
Publisher: Elsevier
Journal: Earth and Planetary Science Letters
Types: Unknown,Article
Subjects: QE, sub-05
We present titanium stable isotope measurements of terrestrial magmatic samples and lunar mare basalts with the aims of constraining the composition of the lunar and terrestrial mantles and evaluating the potential of Ti stable isotopes for understanding magmatic processes. Relative to the OL–Ti isotope standard the d49Ti values of terrestrial samples vary from -0.05 to +0.55‰ whereas those of lunar mare basalts vary from -0.01 to +0.03‰ (the precisions of the double spike Ti isotope measurements are ca. ±0.02‰ at 95 confidence). The Ti stable isotope compositions of differentiated terrestrial magmas define a well defined positive correlation with SiO2 content which appears to result from the fractional crystallisation of Ti bearing oxides with an inferred isotope fractionation factor of ?49Tioxide–melt = -0.23‰×10^6/T^2. Primitive terrestrial basalts show no resolvable Ti isotope variations and display similar values to mantle derived samples (peridotite and serpentinites) indicating that partial melting does not fractionate Ti stable isotopes and that the Earth's mantle has a homogeneous d49Ti composition of +0.005 ± 0.005 (95 c.i. n=29n=29). Eclogites also display similar Ti stable isotope compositions suggesting that Ti is immobile during dehydration of subducted oceanic lithosphere. Lunar basalts have variable d49Ti values; low Ti mare basalts have d49Ti values similar to that of the bulk silicate Earth (BSE) while high Ti lunar basalts display small enrichment in the heavy Ti isotopes. This is best interpreted in terms of source heterogeneity resulting from Ti stable isotope fractionation associated with ilmenite–melt equilibrium during the generation of the mantle source of high Ti lunar mare basalts. The similarity in d49Ti between terrestrial samples and low Ti lunar basalts provides strong evidence that the Earth and Moon have identical stable Ti isotope compositions.
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  • NSF | Magma Structure and Anharmo...
  • RCUK | The oxygen fugacity of cor...
  • SNSF | Stable Isotope Investigati...
  • NSF | Collaborative project: CSED...
  • NSF | Redox and Structural Contro...

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