Epigenetisk koppermineralisering på Finnmarksvidda.

Abstract

In the Precambrian rocks of Finnmarksvidda, one big copper deposit, Biddjovagge, and a series of small sulphide occurrences are located. The sulphides are pyrite, chalkopyrite and phyrrhotite, in some places also bornite and chalcocite. The ore deposits at Biddjovagge are formed in brecciated parts of tight anticlines, the other occurences are disseminations, either within, or at the contacts of various greenstones. Most abundant, however, are quartz-carbonate-sulphide veins within the same rocks. Granitic rocks occur at some distance, but the field relations indicate a closer genetic relationship between the ores and some late orogenic gabbroic intrusives.