The Deep Proterozoic Crust in the North Atlantic Provinces: (158 NATO Science Series C)

The Proterozoic terrains of South Scandinavia and the Grenville Province in North-America have many common features : Regional high­ grade metamorphism (Granulite-facies), anorthosites, etc. They are separated by the Caledonian orogeny and, above all, by the Atlantic Ocean. During the time of the great continental drift controversy, few people were ready to admit that both sides on the Atlantic were once an unique province. Now everybody agrees on the Post-paleozoic age of the Atlantic and, consequently, on the intrinsic homogeneity of the much older. rocks which occur around it. But a detailed comparison is not easy. The Grenville Province is much larger than South Scandinavia, both regions have been investigated by a great number of different schools, using various methods, approaches and concepts. After several attempts, and long discussion, it was felt by a small group of individuals, that literature study would not be enough and that nothing could re­ place the direct contact, in the field, of specialists who had a first­ hand knowledge of all involved regions. The formula of a NATO Advanced Study Institute, which gives a unique opportunity to meet and mix people of various origin and levels, came almost by itself. Much work was needed, much help has been obtained, as detailed in the "Acknowledgements".

Table of Contents:
The Deep Proterozoic Crust in the North-Atlantic Provinces.- 1. Opening address.- 2. Precambrian geodynamical constraints.- 3. Seismic reflection results from Precambrian Crust.- 4. Proterozoic anorthosite massifs.- 5. Sm-Nd isotopic studies of Proterozoic anorthosites: systematics and implications.- 6. Temperature, pressure and metamorphic fluid regimes in the amphibolite facies to granulite facies transition zones.- 7. Fluid enhanced mass transport in deep crust and its influence on element abundances and isotope systems.- 8. C-O-H fluid calculations and granulite genesis.- The Proterozoic Provinces in North America and Greenland.- 9. Tectonic framework of the Grenville Province in Ontario and western Quebec, Canada.- 10. A 1650 Ma orogenic belt within the Grenville Province of northeastern Canada.- 11. A reassessment of the Grenvillian Orogeny in western Labrador.- 12. Geological evolution of the Adirondack mountains: A review.- 13. Polymetamorphism in the Adirondacks: wollastonite at contacts of shallowly intruded anorthosite.- 14. Pb-isotopic studies of Proterozoic igneous rocks, West Greenland, with implications on the evolution of the Greenland shield.- 15. Correlations between the Grenville Province and Sveconorwegian orogenic belt — implications for Proterozoic evolution of the southern margins of the Canadian and Baltic Shields.- The Proterozoic Provinces in South Scandinavia: Geological Evolution and Structure.- 16. The evolution of the South Norwegian Proterozoic as revealed by the major and mega-tectonics of the Kongsberg and Bamble sectors.- 17. Tectonic environment and age relationships of the Telemark Supracrustals, southern Norway.- 18. Geotectonic evolution of southern Scandinavia in light of a late-Proterozoic plate-collision.- 19. TheMandal-Ustaoset line, a newly discovered major fault zone in South Norway.- 20. Terrane displacement and Sveconorvegian rotation of the Baltic shield: A working hypothesis.- 21. Proterozoic development of Bohuslän, south-western Sweden.- 22. Late Presveconorwegian magmatism in the Östfold-Marstrand Belt, Bohuslän, SW Sweden.- 23. The West Uusimaa complex, Finland: an early Proterozoic thermal dome.- The Proterozoic Provinces in South Scandinavia: Geochronology and Geochemistry.- 24. Geochronological framework for the Late-Proterozoic evolution of the Baltic Shield in South Scandinavia.- 25. Isotope geochronology of the Proterozoic crustal segment of southern Norway: A review.- 26. Neodymium isotope evidence for the age and origin of the Proterozoic of Telemark, South Norway.- 27. The Rogaland anorthosites: facts and speculations.- 28. Metamorphic zoning in the high-grade Proterozoic of Rogaland-Vest Agder, SW Norway.- 29. Geothermometry and geobarometry in Rogaland and preliminary results from the Bamble area, South Norway.- 30. Fluid regime in southern Norway: The record of fluid inclusions.- 31. Geochemical constraints on the evolution of the Proterozoic continental crust in southern Norway (Telemark Sector).- 32. Geochemical evolution of the 1.6 - 1.5 Ga-old amphibolite-granulite facies terrain, Bamble Sector, Norway: dispelling the myth of Grenvillian high-grade reworking.- 33. A preliminary study of REE elements and fluid inclusions in the Homme granite, Flekkefjord, South Norway.