Response to the Comment by S.B. Simon, L. Grossman, and S.R. Sutton on 鈥淰alence state of titanium in the Wark-Lovering rim of a Leoville CAI as a record of progressive oxidation in the early Solar Nebula鈥?/span>

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• 作者：Edward D. Young^a ; Kathryn A. Dyl^b ; ^{kdyl@imperial.ac.uk} ; ^{katie.dyl@gmail.com} ; Justin I. Simon^c
• 刊名：Geochimica et Cosmochimica Acta
• 出版年：2012
• 期刊代码：27_00167037
• 类别：ear
• 出版时间：15 May, 2012
• 卷：85
• 期：Complete
• 页码：377-382
• 文件大小：358 K

摘要

S. Simon et al. incorrectly suggest that in earlier work we claimed there was no Ti³⁺ in Wark-Lovering rim pyroxenes. In neither the paper by nor the subsequent paper by did we assert that there was no Ti³⁺ in rim pyroxenes. Rather, we found that many pyroxenes have Ti³⁺ below detection while others have lower Ti³⁺/Ti⁴⁺ than is typical of CAI interiors, indicating rim formation in a relatively oxidizing environment. showed through exhaustive testing that the suggestion by that EMPA data in the paper by were flawed is incorrect. Here we consider each point raised in the comment by S. Simon et al. and reiterate that our electron microprobe data and the XANES data of agree and demonstrate a statistically significant (鈭?蟽) or greater difference between rim and interior pyroxene Ti³⁺/Ti⁴⁺. We show that the oxidation states of Ti in Wark-Lovering rim pyroxenes, the chemistry of rim pyroxenes, and the modal abundances of rim minerals are best explained by reaction between the CAI and gas that was orders of magnitude more oxidizing than the solar-like gas from which the CAIs originally formed.