Contents Preface • Volcano-tectonic variability along segments of the Mid-Atlantic Ridge between Azores platform and Hayes fracture zone: evidence from submersible and high-resolution sidescan sonar data • A seismic inversion study of the axial magma chamber reflector beneath the East Pacific Rise near 10oN • Fault-controlled magma transport through the mantle lithosphere at slow-spreading ridges • Structure, petrology and seafloor spreading tectonics of the Kizildag Ophiolite, Turkey • Is the oceanic Moho a serpentinization front? • Tracing the evolution of hydrothermal fluids in the upper oceanic crust: Sr-isotopic constraints from DSDP/ODP Holes 504B and 896A • Petrological investigations of low temperature hydrothermal alteration of the upper crust, Juan de Fuca Ridge, ODP Leg 168 • The structure and controls on fluid-rock interactions in ocean ridge hydrothermal systems: constraints from the Troodos ophiolite • Rare earth element mobility in a mineralized alteration pipe within the Troodos ophiolite, Cyprus • Drilling of sediment-hosted massive sulphide deposits at the Middle Valley and Escanaba Trough spreading centres: ODP Leg 169 • Precipitation of hydrothermal sediments on the active TAG mound: implications for ochre formation • Significance of modern and ancient oceanic Mn-rich hydrothermal sediments,exemplified by Jurassic Mn-cherts from Southern Greece • Ancient vent chimney structures in the Silurian massive sulphides of the Urals • The fossil record of hydrothermal vent communities • Relics and antiquity revisited in the modern vent fauna • Index