APPEND IX REPORT OF THE STUDY GROUP "VARISCAN OROGENY IN EUROPE" H. J. Zwart, Chairman

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1 APPEND IX REPORT OF THE STUDY GROUP "VARISCAN OROGENY IN EUROPE" H. J. Zwart, Chairman Instituut Aardwetenschappen, Rijksuniversiteit Utrecht, Netherlands The study group "Variscan Orogeny in Europe" with H. J. Zwart as Chairman was established at a meeting of Working Group 9 during the 24th International Geological Congress (Montreal, 1972). After a rather slow start, consisting mainly of correspondence with a number of geologists in Europe, the program for the European Variscides got well underway in 1975 when a full-time assistant for 3 1/2 years became available. U.F. Dornsiepen was appointed to this position funded by the Netherlands Organisation for Pure Research (ZWO). An informal group of geologists was formed in the course of time from the following countries: Austria (A. Fenniger, H. P. Schoenlaub), Belgium (F. Geukens), Czechoslovakia (M. Suk), Federal Republic of Germany (H. J. Behr, U. F. Dornsiepen, P. Giese, R. Maass, O. H. Walliser, K. Weber), France (J. J. Chauvel, J. Cogne, Ph. Matte), German Democratic Republic (B. Jubitz, G. Mathe, M. Schwab), Great Britain (P. Hancock, S. C. Matthews), Hungary (B. Jantsky), Ireland (D. Naylor), Italy (T. Cocozza, N. Minzoni), Portugal (A. Ribelto), Spain (M. Julivert) Switzerland (J. F. von Raumer) and The Netherlands (T. V. Perekalina, E. den Tex, H. J. Zwart). The members of the group undertook to contribute to the project with profiles through the following parts of the Variscan belt of Europe: Southern Ireland, South Wales - Cornwall, Armorican Massif, Iberian Massif E-W and N-S, Sardinia, Pyrenees, Massif Central, Ardennes, Rheinisches Schiefergebirge, Harz Mountains - Ore Mountains, Bohemian Massif E-W and N-S, Western Alps, Eastern Alps, and the Pannonian Basin. Maps were promised to show plutonism, volcanism, metamorphism, basement, tectonics and Transatlanic correlation. The study group met several times: in Leiden in May 1976, in Goettingen in September 1977, and again in Leiden in September The last meeting was followed by an excursion through the Variscan chain, starting in the Ardennes, going through Odenwald, Black Forest, Western Alps, Massif Central and ending in the Montagne Noire. Some scientific communications of the 1976 meeting were included in Krystalinikum vol. 14 published in 1979: 1. Centre Armoricain d'etude structurale des $ocles (coordinator J. J. Chauvel) A cross section through the Armorican blassif 2. U. F. Dornsiepen Rb-Sr whole rock ages within the European Hercynian. A review. 3. M. Julivert Hercynian orogeny and Carboniferous paleogeography in northwestern Spain: a model of deformation-sedimentation relationships. 4. S.C. Matthews Caledonian Connections of Variscan Tectonism. 5. T. V. Perekalina Der Magmatismus des variszischen Europas. 6. H. P. Schoenlaub and S. M. Scharbert The early history of the Eastern Alps. 7. K. Weber Das Bewegungsbild im Rhenoherzynikum - Abbild einer varistischen Subfluenz. The second meeting of the European Geological Societies (MEGS II) in Amsterdam 1977 provided the opportunity for a tentative synthesis of the development of the European Variscides, which has been published in Geologie en Mijnbouw, vol. 57 (H. J. Zwart and U. F. Dornsiepen, The tectonic framework of central and western Europe). The final results were discussed in 1978 and since then the maps, profiles and accompanying text have been assembled for publication in a special issue of Geologie in Mijnbouw, vol. 60. Unfortunately not all members were able to send in their contributions and it is regrettable that the Armorican Massif and the French Central Mas- sif are not represented in this final report, also a paper on the crustal structure of the Variscides by P. Giese and U. F. Dornsiepen is still in preparation. The following contributions are published in this volume: 1. L. Carmignani, T. Cocozza, N. Minzoni, and P. C. Pertusati. Structural, paleographic and petrographic lineaments of the Variscan cycle in Sardinia. 2. F. Ebner, A. Fenniger and H. P. Schoenlaub The Variscan in Austria. 3. F. Geukens

2 Cross sections through the Belgian Variscan 10. R. Maass Massif. The Variscan Black Forest. 4. M. Julivert 11. S. C. Matthews A cross section through the northern part of A cross section through southwest England. the Iberian Massif: its position within the Her- 12. D. Naylor, G. D. Sevastopulo, A. G. Sleeman cynian fold belt. and T. A. Reilly. 5. Ph. Matte The Variscan fold belt in Ireland. Structure of the southern part of the Massif 13. T. V. Perekalina Central Francais. Variscan volcanism of central and western 6. D. Naylor and G. D. Sevastopulo The Hercynian "front" in Ireland. 7. J. F. Savage The Hercynian orogeny in the Cantabrian Mountains, North Spain. 8. M. Suk Hauptprobleme des tiefen Unterbaues des Boh- mischen Masse. 9. E. den Tex A pre-variscan continental rift system in NW Spain. Of the papers presented to the 1977 Gottingen meeting as below the first five appeared in Zeitshrift der deutschen eologischen Gesellschaft, vol. 129 and include: 1. H. J. Behr Subfluenz-Prozesse im Grundgebirõs-Stockwerk Mitteleuropas. 2. J.P. Burg and Ph. Matte A cross section through the French Massif Central and the scope of its Variscan geodynamic evolution. 3. L. Carmignani, T. Cocozza, N. Minzoni and P. C. Pertusati. The Hercynian orogenic revolution in Sardinia. 4. J. Chab and M. Suk Metamorphic Gliederung der Boehmischen Masse. 5. U. F. Dornsiepen Ein Uberblick uber die europaischen Varisziden. 6. P. Giese Die Krustenstruktur des Varistikums und das Problem der Krustenverkuerzung. 7. P. L. Hancock, W. M. Dunne and M. E. Tringham Variscan structures in southwest Wales. 8. B. Jantsky Geological characterization of the Variscan and pre-variscan in Hungary. 9. M. Julivert A cross section through the northern part of the Iberian Massif. Europe. 14. J. F. yon Raumer Variscan events in the Alpine region. 15. A. Ribeiro A Geotraverse through the Variscan Fold Belt in Portugal. 16. J. F. Savage Geotectonic cross sections through the Cantabrian mountains northern Spain. 17. M. Schwab and G. Mathe A geological cross section through the Variscides in the German Democratic Republic (Eastern Erzgebirge, Central SaxonJan Lineament, SaxonJan Granulite Complex, Harz Mountain). 18. M. Suk and J. Weiss Geological section through the Variscan Orogen in the Bohemian Massif. 19. E. den Tex A geological section across the Hesperian Massif in western and central Galicia. 20. O. H. Walliser The geosynclinal development of the Rheinische Schiefergebirge (Rhenohercynian Zone of the Variscides; Germany). 21. K. Weber The structural development of the Rheinische Schiefergebirge. 22. H. O. Zwart Three profiles through the Central Pyrenees. Several members of the study group also contributed to the volume Geology of Europe, 26th International Geological Congress (Paris 1980). The support of the Netherlands Organisation for Pure Research both for providing an assistant and for a subsidy towards the printing costs of the Geologie en Mijnbouw special issue is gratefully acknowledged. Moreover, thanks are due to Chevron Oil Company, Mobil Oil N. V. and the Leidse Universiteits Fonds for financial support of the Leiden Meetings. 310

Introduction. Table 27. Median concentrations of Eu in the FOREGS samples and in some reference data sets.

Introduction. Table 27. Median concentrations of Eu in the FOREGS samples and in some reference data sets. Eu Europium Introduction See section on Rare Earth Elements (REEs). Table 27 compares the median concentrations of Eu in the FOREGS samples and in some reference datasets. Table 27. Median concentrations