CHONDRULE TIESCHITZ XII REVISITED: READING A VERY OLD LOGBOOK.

KURAT GERO,; VARELA, M.E.; ZINNER E

Houston

Conferencia; Lunar and Planetary Science Conference; 2010

Lunar and Planetary Science Institute

Chondrule Tieschitz XII (Tie XII) was described in 1971 and its petrological and chemi-cal features (as well as those of other chondrules from the Tieschitz OC3 chondrite) were interpreted to re-cord vaporization and condensation processes [1]. We recently re-investigated this object with an ion micro-probe, an instrument not available at that time, with the objective of testing and improving our recently formu-lated ?Primary Liquid Condensation Model? (PLCM) [2]. This model aims to provide an improved under-standing of the messages encrypted by meteoritic con-stituents, including chondrules, and meteoritic rocks. So far, the model is capable of explaining most fea-tures exhibited by chondritic constituents and many non-chondritic meteoritic rocks (such as achondrites and silicates in meteoritic irons). The trace element data gathered on chondrule Tie XII perfectly fit the model and the theoretical predictions of phase conden-sation in a non-canonical solar nebula [e.g., 3]. The new data reveal the interesting history of an individual chondrule and suggest a solution to a long-existing problem