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PKNTTi f:.skola. M.-.\. Kl. 



ECLOGITES IN NORDFJORD AND MØRE. 



Petrologicai Sketch of the Gneiss Area 

 in Nordfjord and Møre. 



Introduction. 



I he eclogite-bearing gneiss area in western Norway comprises the 

 northern part or the Nordfjord district of Sogn og Fjor da ne Fylke 

 (formerly Nordre Bergen h us A m ti and almost the whole of the Møre 

 Fylke (formerly Romsdals Amt) to which belong two districts: the 

 southern called Sen dm ere and the northern called Nordmøre. 



This part of the Norwegian coast region is a highland cut by numerous 

 deep fjords. It may well be spoken of as an elevated and re-eroded 

 peneplain, and its geological architectonics are remarkabh' simple: all the 

 vast masses of mountains belong to a deep-seated formation mainly con- 

 sisting of igneous gneiss, within which occur numerous smaller masses ot 

 olivine-rock, labradorite-rock and eclogite, in evident genetical connection 

 with one another, and, moreover, crystalline limestone. 



The first and so far the best geologic description of the gneiss area 

 in Sondmore and Nordfjord was given by H. Reusch in 1877'. The 

 geological map (fig. 2) is, in part, a copy of that accompanying the treatise 

 just quoted, and in part drawn according to J. H. L. Vogt^ and the occur- 

 rences of limestone according to C. Bugge -^. My own observations on the 

 occurences of eclogite, olivine-rock and labradorite-rock ha\e also been utilized. 



The gneiss. 



The gneiss of Nordtjord and Mere really presents a series of struc- 

 tural varieties from a non-foliated coarse-grained porphyritic granite through 

 augengneiss to different kinds of foliated gneiss, as e. g. veined gneisses 

 or arterites, fine-grained, schistose mica-gneisses, often with almandite, and 



1 H. H. Reusch, Grundfjeldet i Sondre Søndmore og en del av Nordfjord. Forhandlinger 

 i Videnskapsselskapet i Christiania 1877. 



2 J. H. L. Vogt, Olivinstenen i indre og sondre Sondmore. Nyt Magazin for Naturviden- 

 skabene, 1883. 



3 C. Bugge, Kalksten og marmor i Romsdals amt. Norges Geol. Undersogelse, Aarbog 

 1905, VI. 



