Journal
METEORITICS & PLANETARY SCIENCE
Volume 44, Issue 4, Pages 573-579Publisher
WILEY
DOI: 10.1111/j.1945-5100.2009.tb00752.x
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Funding
- Particle Physics and Astronomy Research Council
- Royal Society
- Science and Technology Facilities Council [ST/G003068/1, PP/D001099/1] Funding Source: researchfish
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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 (1 sigma). 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.
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