1921. No. 8. ON THE i:cLO(;iTi:s ok norw.w. hj 



Contents. 



Prt-face 



Page 

 3 



Introduction . 



\ 



On the methods 6 



Eclogites in Nordljord an More 14 



Pctrological sketch of the gneiss area in Nordfjord and More 14 



Introduction. The Gneiss 14 



The limestone 18 



The olivine-rock or dunite 19 



The labradorite-rock 23 



The eclogite 26 



Quantitative investigations on the eclogites 27 



The eclogite from Rodhaugen, Almklovdalen, Sondmorc 27 



The chloromelanite-eclogite of Duen type from VaneK^sdalen, Sundmore 31 



The eclogite from Lyngenes, Sorpoll, Selje, Nordfjord 36 



The eclogite from Silden, Nordfjortl 37 



The eclogite from Saltkjæl, Nordfjord 40 



The eclogite-hornblendegabbro from Romsdalshorn 43 



Structural types of eclogite 45 



Mineralogical varieties of eclogite 50 



The eclogite in the olivine-rock 51 



Mode of occurrence and general characters 51 



Eclogite in olivine-rocks in other countries 54 



The eclogite in the gneiss 59 



Mode of occurrence 5^ 



The inclusions of eclogite compared with other "dark inclusions" in gneiss 



and granite 61 



Eclogite in gneiss in other countries 64 



On the genetic relations between the eclogites, dunites and labradorite-rocks ... 66 



Alteration of the eclogites 7 o 



The myrmekite-Hkj pligioklase-diopside-symplectite formed from the clino- 



pyroxene 7° 



The kelyphite 74 



The amphibolitization 75 



Change of faciès during crystallization 1° 



Amphibole-eclogite 7^^ 



Eclogite-hornblendegabbro '^tk> ''^ 



On the age of the gneiss formation of Nordfjord and MJ^iplfci. 80 



Garnet in the labradorite-rocks of the Sogn area '• 81 



Inclusions of olivine-rock in labradorite-rock near Aurlandsljord in Indre Sogn.. 81 



Garnet in labradorite-rock in Indre Sogn 85 



Garnet-gabbro from Aardal, Sogn 87 



Eclogite and garnet in the labradorite-rocks of the Bergen region 9« 



Synopsis of the labradorite-rock series after C. F. Kolderup 9» 



The author's observations on garnet-labradorite-rock in the Bergen region 95 



Scapolite-bearing labradorite-rock 95 



The alteration of the minerals in the garnet-labradorite-rock 97 



