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Geology; October 2003; v. 31; no. 10; p. 889-892; DOI: 10.1130/G19666.1
© 2003 Geological Society of America
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Dating the subduction of the Arabian continental margin beneath the Semail ophiolite, Oman

Clare J. Warren*,1, Randall R. Parrish*,2, Michael P. Searle*,3 and David J. Waters*,3

1 Department of Earth Sciences, Oxford University, Parks Road, Oxford OX1 3PR, UK
2 National Environment Research Council Isotope Geoscience Laboratories, Keyworth, Nottingham NG12 5GG, UK, and Department of Geology, Leicester University, Leicester LE1 7RH, UK
3 Department of Earth Sciences, Parks Road, Oxford University, Oxford OX1 3PR, UK

The presence of high-pressure (P) eclogites along the northeast margin of the Arabian continental plate beneath the Semail ophiolite demonstrates that subduction of thinned continental crust to pressures of 20 kbar (~80 km depth) has occurred. Current debate centers on whether this high-P metamorphism occurred prior to, during, or following ophiolite emplacement, which is known to have started ca. 95–93 Ma. Five concordant U-Pb zircon ages from a garnet-clinopyroxene-phengite-crossite eclogite from As Sifah, northeast Oman, precisely constrain the age of high-P metamorphism at 79.1 ± 0.3 Ma. This age demonstrates that high-P metamorphism occurred during continental subduction 15 m.y. after formation of the ocean floor that subsequently became the Semail ophiolite.

Key Words: Oman ophiolite • subduction • Arabian margin • eclogites • U-Pb geochronology




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