6o 



F'ENTTI F.SKOLA. 



M.-N. Kl. 



It would l)c of i^icat interest to know whether all the basic inclusions 

 in the gneiss are or once have been — eclogite. I studied the fairly 



w( 11 exposed shore-rocks near Bryggen rather carefully and soon arrived 

 at the conclusion that such is the case, excepting some coarse-grained 

 (lioiitie fragments, of a more acid composition than the eclogites. Some 

 of them are now composed mainly of biotite and epidote. All the more 

 basic fragments show eclogitic kernels or, if entirely amphibolitized, prove 

 by their sti'iicture to be altered eclogite. 



Inclusions of eclogite, more or less amphibolitized, were found in all 

 the x-arieties of the gneiss: in the almost non-foliated gneiss-granite as well 



Fig. 8. Lenses of eclogite with boundary-zones of amphibolite. Small lenses have altered 

 thoroughly into amphibolite. Bryggen, Nordfjord. 



as in the veined and banded gneisses. In some tracts, however, no eclogitic 

 inclusions can be found. Thus I walked four kilometers from Torsvik to 

 the church of Vanelven and almost 20 kilometers from Almklovsaeter to 

 Omelfot near Dalstjorden without seeing any one enclosure of eclogite. In 

 one case the reason was, that there are no basic inclusions whatever, and 

 in the other case, that all the eclogites have been thoroughly amphibolitized 

 — or primarily consolidated as hornblende-gabbros. The arteritization, or 

 development of veins, was here too effective during the last stage of con- 

 solidation of the gneiss, and the result was a migmatite in which the older 

 portions are hornblende-bearing gneisses. 



By this I do not mean that such mixed rocks would necessarily 

 have contained inclusions of eclogite, but that their amphibolitic portions 

 have some genetic similarity to such inclusions: What in one case appears 



