During the revolution in earth science that has taken place in recent years, studies of the North Atlantic ocean floor and of Iceland have played an increasingly significant role. Icelandic geoscientists have followed, and taken part in, these studies with a keen interest; one of the first tasks of the Geoscience Society of Iceland was to organize an Icelandic symposium on "Iceland and Mid-Ocean Ridges" in 1967. At the suggestion of Dr. G. Pfuason, the Society and various local research institutions formed in 1972 an Organizing Committee for an international meeting on earth science. It was decided that it should be devoted to examining the various expressions of geo~namical forces in the North Atlantic area, in particular at the ocean ridges passing through Iceland. Apart from the scientific content of such a meeting, the organizers also felt it was highly important for scientists from both sides of the Atlantic to meet in Iceland, to become acquainted with recent progress in earth science research there and to coordinate their future research projects in the area. The meeting was held in Reykj avik 1 - 7 July, 1974, and was followed by field trips in Iceland. Generous financial support from the NATO Scient'ific Affairs Division, the Inter-Union Com­ mission on Geodynamics, and many other sources, is gratefully acknowledged.

Inhalt

Continental Drift in the Atlantic and the Arctic.- The Reykjanes Ridge - a Summary of Geophysical Data.- Deep Structure, Evolution and Origin of the Icelandic Transverse Ridge.- Morphology of the Mid-Ocean Ridge between Iceland and the Arctic.- The Azores-Gibraltar Plate Boundary.- Deep Drill Investigations of the Oceanic Crust in the North Atlantic.- The Iceland Phenomenon: Imprints of a Hot Spot on the Ocean Crust, and Implications for Flow Below the Plates.- Tertiary Basalts of Baffin Bay: Geochemical Evidence for a Fossil Hot-Spot.- Petrochemistry of the Volcanic Rocks of the North Atlantic Ridge System.- Chemistry of Tholeiitic Basalts from Iceland, and their Relation to the Kverkfjöll Hot Spot.- The Petrologic Nature of the Lower Oceanic Crust and Upper Mantle.- The Structure of Eastern Iceland.- Eruptive Mechanisms in Iceland.- On the Topography of the Volcanic Zones in Iceland (Abstract).- Focal Mechanism Solutions of Intraplate Earthquakes and Stresses in the Lithosphere.- Seismicity of Iceland.- Vertical Crustal Movement in Iceland.- Crustal Movements in the Myvatn- and in the Thingvallavatn-Area.- Marine Heat Flow Measurements in the Norwegian-Greenland Sea and in the Vicinity of Iceland.- Heat Flow and Hydrothermal Activity in Iceland.- The Composition of Thermal Fluids in Iceland and Geological Features Related to the Thermal Activity.