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
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
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DOI：
10.1016/j.gca.2012.01.041
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发表时间：
2012-05
影响因子：
5
通讯作者：
S. Simon;L. Grossman;S. Sutton
中科院分区：
文献类型：
--
作者：
S. Simon;L. Grossman;S. Sutton
Dyl等人（2011年）指出，他们的结果证实了J. Simon等人（2005年）的结论，即在富Ca-、Al耐火夹杂物上发现的Wark-Lovering边缘（Wark和Lovering，1977年）中的辉石具有比夹杂物内部的原生辉石更低的Ti 3 +/Titotratios。虽然这一说法是正确的，但它具有误导性，因为J. Simon等人（2005）得出结论，轮辋中没有Ti 3+，而Dyl等人（2011）在42项新轮辋分析中的41项中发现了Ti 3+。此外，J. Simon等人（2005年）得出结论，边缘在氧化性更强的条件下形成，log fO 2 IW-1，或比内含物内部高106 - 7 logunits。Simon et al.（2005）的结论受到S. Simon等人（2007年），Dyl等人（2011年）的新数据不支持。目前的工作是为了澄清这个问题和其他问题。
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+/Titotratios 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.