Comment on “Valence state of titanium in the Wark–Lovering rim of a Leoville CAI as a record of progressive oxidation in the early Solar Nebula” by K.A. Dyl, J.I. Simon and E.D. Young

Dyl et al. (2011) state that their results confirm the conclusion of J. Simon et al. (2005) that the pyroxene in Wark–Lovering rims (Wark and Lovering, 1977) found on Ca-, Al-rich refractory inclusions has lower Ti3+/Titot ratios than the primary pyroxene in the interiors of inclusions. While true,...

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Bibliographic Details
Published in:Geochimica et cosmochimica acta 2012-05, Vol.85 (5, 2012), p.373-376
Main Authors: Simon, S.B., Grossman, L., Sutton, S.R.
Format: Article
Language:English
Subjects:
calcium
GEOSCIENCES
OXIDATION
SILICATE MINERALS
SOLAR NEBULA
TITANIUM
VALENCE
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Summary:Dyl et al. (2011) state that their results confirm the conclusion of J. Simon et al. (2005) that the pyroxene in Wark–Lovering rims (Wark and Lovering, 1977) found on Ca-, Al-rich refractory inclusions has lower Ti3+/Titot ratios than the primary pyroxene in the interiors of inclusions. While true, the claim is misleading because J. Simon et al. (2005) concluded that there was no Ti3+ in the rims, whereas Dyl et al. (2011) found Ti3+ in 41 of 42 new rim analyses. In addition, J. Simon et al. (2005) concluded that rims formed under much more oxidizing conditions, log fO2⩾IW-1, or ⩾6–7logunits higher, than inclusion interiors. The conclusions of J. Simon et al. (2005) were disputed by S. Simon et al. (2007) and are not supported by the new data of Dyl et al. (2011). The present work is intended for clarification of this and other issues.
ISSN:0016-7037
1872-9533
DOI:10.1016/j.gca.2012.01.041