Warren, Clare J.; Parrish, Randall R.; Waters, David J. and Searle, Michael P.
(2005).
| URL: | http://www.springerlink.com/content/u7212864773783... |
|---|---|
| DOI (Digital Object Identifier) Link: | https://doi.org/10.1007/s00410-005-0028-5 |
| Google Scholar: | Look up in Google Scholar |
Abstract
Eclogites from the deepest structural levels beneath the Semail ophiolite, Oman, record the subduction and later exhumation of the Arabian continental margin. Published ages for this high pressure event reveal large discrepancies between the crystallisation ages of certain eclogite-facies minerals and apparent cooling ages of micas. We present precise U-Pb zircon (78.95 ± 0.13 Ma) and rutile (79.6 ± 1.1 Ma) ages for the eclogites, as well as new U-Pb zircon ages for trondhjemites from the Semail ophiolite (95.3 ± 0.2 Ma) and amphibolites from the metamorphic sole (94.48 ± 0.23 Ma). The new eclogite ages reinforce published U-Pb zircon and Rb-Sr mineral-whole rock isochron ages, yet are inconsistent with published interpretations of older 40Ar/39Ar phengite and Sm-Nd garnet dates. We show that the available U-Pb and Rb-Sr ages, which are in tight agreement, fit better with the available geological evidence, and suggest that peak metamorphism of the continental margin occurred during the later stages of ophiolite emplacement.
| Item Type: | Journal Item |
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| ISSN: | 0010-7999 |
| Academic Unit/School: | Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences Faculty of Science, Technology, Engineering and Mathematics (STEM) |
| Item ID: | 10616 |
| Depositing User: | Users 2315 not found. |
| Date Deposited: | 17 Apr 2008 |
| Last Modified: | 07 Dec 2018 09:10 |
| URI: | http://oro.open.ac.uk/id/eprint/10616 |
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