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Geological Society, London, Special Publications; 1992; v. 60; p. 39-63;
DOI: 10.1144/GSL.SP.1992.060.01.03
© 1992 Geological Society of London

Ridge axial segmentation in the Oman ophiolite: evidence from along-strike variations in the sheeted dyke complex

C. J. MacLeod1

1 Laboratoire de Tectonophysique, Université de Montpellier II, Place Eugène Bataillon, 34060 Montpellier cedex, France
Department of Earth Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
Institute of Oceanographic Sciences Deacon Laboratory, Wormley, Godalming, Surrey GU8 5UB, UK

D. A. Rothery2

2 Department of Earth Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK

Evidence from along-strike variations in the sheeted dyke complex shows that the spreading axis at which the Oman ophiolite formed was segmented by first- and/or second-order discontinuities, most probably propagating rifts and overlapping spreading centres. We identify at least four, possibly up to seven, of these discontinuities along the c.500 km ridge-parallel length of the ophiolite, but recognize no unequivocal transform fault structures. We show that the discontinuities in the sheeted dyke complex can be related to aspects of segmentation previously deduced from mantle flow fabrics and deep crustal structure, and conclude that the Oman palaeo-spreading axis was segmented on a scale of 50–100 km, comparable with that of a modern fast-spreading axis such as the East Pacific Rise.





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