Abstract
Three different types of plate boundaries are found on the three sides of the Gulf of Oman in the north-west Indian Ocean. The structure and tectonics of each these boundaries is discussed using mainly marine geophysical data obtained from cruises in the region between 1975 and 1980. To the north lies the Makran subduction zone which has developed an excellent example of an accretionary prism on the over-riding (Eurasian) plate. On the south-western boundary is the passive continental margin of Oman, exhibiting large tilted crustal blocks formed during rifting of the margin of the Arabian plate and now completely buried by sediment. Thirdly, the Murray Ridge to the south-east forms a continuation of the Owen Fracture Zone separating the oceanic parts of the Indian and the Arabian plates, but is presently undergoing extension.
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