Tectonics and Geophysics of Continental Rifts : Volume Two of the Proceedings of the NATO Advanced Study Institute Paleorift Systems with Emphasis on the Permian Oslo Rift, Held in Oslo, Norway, July 27 – August 5, 1977

Proceedings of the NATO Advanced Study Institute, Oslo, Norway, July 27-August 5, 1977 Front Matter....Pages i-xv Evolution of Continental Rift Systems in the Light of Plate Tectonics....Pages 1-9 Evolution of the Earth’s Crust....Pages 11-28 The Origin and Evolution of Rifts and Rift Valley Structures: A Mechanistic Interpretation....Pages 29-37 Experimental Model Studies of Rift-Valley Systems....Pages 39-40 Rates of Sedimentation and Vertical Subsidence in Neorifts and Paleorifts....Pages 41-47 Deep Structure and Evolution of the Baikal Rift Zone....Pages 49-61 Two Stages Rhinegraben Rifting....Pages 63-71 The Rio Grande Rift and a Diapiric Mechanism for Continental Rifting....Pages 73-80 Owens Valley — A Major Rift between the Sierra Nevada Batholith and Basin and Range Province, U.S.A.....Pages 81-88 Rift Systems in the Western United States....Pages 89-110 The Late Precambrian Central North American Rift System — A Survey of Recent Geological and Geophysical Investigations....Pages 111-123 An Early Paleozoic Continental Rift System in Galicia (NW Spain)....Pages 125-132 The Midland Valley as a Rift, Seen in Connection with the Late Palaeozoic European Rift System....Pages 133-147 Main Geologic Features of the Oslo Graben....Pages 149-165 The Tectonic History of the Oslo Region....Pages 167-194 The Oslo Region during the Early Palaeozoic....Pages 195-202 The Margin South of Australia — A Continental Margin Paleorift....Pages 203-219 Passive Continental Margins and Intra-Cratonic Rifts, A Comparison....Pages 221-227 Observations on the Margin Off Norway (66–70°N) and the History of Early Cenozoic Rifting....Pages 229-236 Pelagic Sedimentation in Immature Ocean Basins....Pages 237-248 North Sea Rift and Basin Development....Pages 249-277 A Comparison of Magnetic Anomalies in the Red Sea and the Gulf of Aden....Pages 279-287 Palaeomagnetism in the Oslo Rift Zone....Pages 289-296 Seismic Mapping of the Fennoscandian Lithosphere and Asthenosphere with Special Reference to the Oslo Graben Region....Pages 297-311 The Ideal-Body Concept in Interpretation of the Oslo Rift Gravity Data and their Correlation with Seismic Observations....Pages 313-327 Comparison of the East African Rift System and the Permian Oslo Rift....Pages 329-345 A Comparison between the Older (Karroo) Rifts and the Younger (Cenozoic) Rifts of Eastern Africa....Pages 347-350 Main Features of Evolution and Magmatism of Continental Rift Zones in the Cenozoic....Pages 351-366 The St. Lawrence Paleo-Rift System: A Comparative Study....Pages 367-384 Some Problems of Rifting Development in the Earth’s History....Pages 385-399 Rift Valleys on Earth, Mars and Venus....Pages 401-408 Paleorifts — Concluding Remarks....Pages 409-424 Back Matter....Pages 425-444 The NATO Advanced Study Institute "Paleorift Systems with Emphasis on the Permian Oslo Rift" was held at Sundvollen near Oslo, Norway, 26. July - 5. August, 1977. The meeting included 6 field trips to various parts of the Oslo Region. 70 official participants and 16 observers from 14 countries attended the meeting. The majority of the invited lectures, short research papers and progress reports presented at the meeting are published in two volumes, of which this is volume No. II. A table of con tents for both volumes is include8 herein. The field trip guide is being published in the Nor~gian Geological Survey Series, Vol. 327 (1978). We are especially pleased to acknowledge the efforts of the many authors of contributed papers, and the able assistance of secretaries, proof-readers and other staffmembers without whose help these volumes would not have been possible. Oslo, 20. February 1978. Ivar B. Ramberg Else-Ragnhild Neumann xi Organizing Committee members: O. Eldholm Department of Geology, University G. Grønlie of Oslo J. Naterstad I.B. Ramberg (chairman) J.A. Dons Mineralogical-Geological Museum, B.T. Larsen (secretary) University of Oslo E.-R. Neumann (secretary) K.S. Heier (chairman) Norwegian Geological Survey S. Huseby B. Sundvoll M.A. Sellevoll Seismological Observatory, University of Bergen K. Storetvedt Geophysics Institute, University of Bergen P.M. Ihlen Geological Institute, University of Chr. Oftedahl Trondheim F.M. Vokes E.S. Husebye NTNF/NORSAR, 2007 Kjeller This volume is Scientific Report No. 40 of the Geodynamics Project