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

Journal Article · Tue May 29 00:00:00 EDT 2012 · Geochimica et Cosmochimica Acta

DOI:https://doi.org/10.1016/j.gca.2012.01.041· OSTI ID:1039060

Simon, S B; Grossman, L; Sutton, S R ^[1]

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1. UC

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⁺/Ti^tot 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 ≥ 6-7 log units 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.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
• Sponsoring Organization: National Aeronautics and Space Administration (NASA)
• OSTI ID: 1039060
• Journal Information: Geochimica et Cosmochimica Acta, Vol. 85, Issue 05, 2012; ISSN 0016-7037
• Publisher: The Geochemical Society; The Meteoritical Society
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

58 GEOSCIENCES
OXIDATION
SILICATE MINERALS
SOLAR NEBULA
TITANIUM
VALENCE