The broad objectives of the research sponsored by the Office of Naval Research under contract N00014-85-K-0583 were to increase our understanding of the fundamental tectonic and petrological processes which determine the genesis and evolution of the oceanic lithosphere. In order to achieve these objectives, our research has been focused on the two main types of plate boundaries found in the ocean basins: (a) accretionary boundaries along mid-ocean ridges, and (b) transform boundaries. Both themes have been approached in two areas: (a) the central and northern Red Sea, where the earliest stages of development of an oceanic accretionary plate boundary and transform boundaries can be observed; (b) the equatorial Mid Atlantic Ridge, where a mature system of short spreading ridge axis segments are offset by some of the largest active transforms of the entire mid-ocean ridge system. We have attempted in our research to combine as much as possible a morphotectonic with a geochemical/petrological approach, in order to achieve broader answers to our objectives. Keywords: Military publications, Periodical.