Gilmour, Jamie and Crowther, Sarah and Busfield, Alli and Holland, Greg and Whitby, James (2009) An I-Xe Constraint on the Age of the CB Chondrites, and a Reevaluation of the Closure Age of Shallowater Enstatite. Meteoritics and Planetary Science, 44 (4). pp. 573-579. ISSN 1086-9379
Full text not available from this repository.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 (1s̀). 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.
| Item Type: | Article |
|---|---|
| Journal or Publication Title: | Meteoritics and Planetary Science |
| Subjects: | G Geography. Anthropology. Recreation > GE Environmental Sciences |
| Departments: | Faculty of Science and Technology > Lancaster Environment Centre |
| ID Code: | 55271 |
| Deposited By: | ep_importer_pure |
| Deposited On: | 20 Jun 2012 14:54 |
| Refereed?: | Yes |
| Published?: | Published |
| Last Modified: | 26 Jul 2012 20:37 |
| Identification Number: | |
| URI: | http://eprints.lancs.ac.uk/id/eprint/55271 |
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