Abstract
The iodine xenon system has been analyzed in samples of 7 chondrules from the CB chondrites Gujba and Hammadah al Hamra (HaH) 237. One sample from Gujba defined a high temperature iodine xenon isochron corresponding to closure 1.87 ± 0.4 Ma before closure of Shallowater enstatite. Motivated by this result, we employ outlier rejection to re evaluate the Shallowater age, leading to a modified value of 4562.3 ± 0.4 Ma (1σ). In this process, the datum obtained by combining our I Xe age for Gujba with the literature Pb Pb age is rejected as an outlier, indicating that in this sample the I Xe system closed earlier than the accepted Pb Pb age of chondrules from CB chondrites. The need for a formation environment distinct from that of chondrules from other meteorites is thus reduced. © The Meteoritical Society, 2009.
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Gilmour, J. D., Crowther, S. A., Busfield, A., Holland, G., & Whitby, J. A. (2009). An early I Xe age for CB chondrite chondrule formation, and a re evaluation of the closure age of Shallowater enstatite. Meteoritics and Planetary Science, 44(4), 573–579. https://doi.org/10.1111/j.1945-5100.2009.tb00752.x
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