'921. No. 8. ox THE ECLOGITES OF NORWAY. 65 



I had specimens of the Munchberg eclogites from Silber bach Hof, 

 nd \V e i s s e n s t e i n for comparison. Structurally they are all most like 

 ■e Duen type, though, in the foliation of the ground-mass, they approach 

 le Silden type. The garnet, unlike most of the Norwegian eclogites, con- 

 tains inclusions of quartz. 



In the Munchberg gneiss area also occur masses of serpentined 



Another eclogite-bearing tract is the gneiss and granulite area of 

 Saxony. These formations also had been interpreted as intrusive in the 

 Palezoic formations b}- C. F. Naumann, but later H. Credner, E. Dathe and 

 others re-accepted the Wernerian idea of a pre-Cambrian age of this base- 

 ment gneiss. The problem, as regards the gneiss, was settled by C. Gäbert^ 

 who gave conclusive e\'idence of its igneous and intrusive nature. Some 

 occurrences of eclogite are associated with the olivine-serpentine-rocks, but 

 far more numerous are those forming inclusions in the gneiss. A. Sauer 

 and F. Schalch-^ enumerate 54 occurrences either directly enclosed in the 

 gneiss or surrounded by amphibolite. 



In the Lower Austrian Forest region eclogite, according to 

 F. Becke"^, occurs in (igneous) gneiss as well as in the olivine-rock. The 

 former always stands m close connection with hornblende-rocks. 



H. B. Patton^ found eclogite surrounded by a zone of ampibolite, 

 embedded in gneiss at G r ü n near Marien bad in Bohemia. Olivine- 

 rock also occurs. 



The eclogites of S au alps and Koralps in Carinthia have been 

 described bv M. V. Lipoid*^. They occur as inclusions (Einlagerungen) 

 embedded in the gneiss parallel to the foliation. 



In the Back Alps^ the eclogite is enclosed in granulite and garnet- 

 bearing gneiss along with serpentines (diallage-serpentine and diallage-rock). 

 The eclogites are accompanied b}- amphibolites. 



In the Mont Blanc region eclogites, associated with amphibolites 

 and serpentines, are found within the crystalline mantle which surrounds the 



1 C. W. (iümbel, Ueber das Alter der Mûnchberger Gneiss-Partie im Fichtelgcbirgc. N". 

 Jahrb. Min. etc. 1861, 257. 



2 C. Gäbert, Die Gneise des Erzgebirges und ihre Kontaktwirkungen. Zeitsch. d. deutsch, 

 geol. Ges. 1907. 



3 A. Sauer und F. Schaloh, Ueber die Verbreitung des Eklogites im S\V-Thcile des Erz- 

 gebirges. X. Jahrb. Min. etc. 1884, II, 27. 



4 F. Becke, Die Gneissformation des niederösterreichischen Waldvierteis. T. M. P. M., 

 1882, 317. 



5 H. B. Patton, Die Serpentin- und Amphibolgesteine nördlich von Marienbad in Böhmen. 

 T. M. P. M. 9, 1888, 124. 



'' M. V. Lipoid, Die crystallinen Schiefergesteine in nordöstlichen Kärnthen. Ref. N. J. 



1858, 222. 

 ' J. A. Ippen, Zur Kenntniss der .Eklogitc und Amphibolgesteine des Bachergebirges. 



Mittheilungen d. nat.-wiss. Ver. f. Steiermark, 1892. Ref. X. Jahrb. 1894, I, 461. 



Vid.-Selsk. Skrifter. 1. M.-N. Kl. 1921- No.8. » 



