Abstract

The eastern Mesabi district of Minnesota is economically important because of the current large scale utilization of the magnetite-bearing Biwabik Fe-formation as a source of Fe ore. The Animikie group of sediments, consisting of the Pokegama, Biwabik, and Virginia formations, were deposited successively over the Giants Range granite. These sediments were subsequently intruded by small diabase bodies and the Duluth gabbro. The 4 well-established members of the Biwabik Fe-formation have been further subdivided into 22 submembers, which are briefly described. This paper establishes the stratigraphic framework upon which the generalized distribution of minerals of the metamorphosed Biwabik Fe-formation can be presented. The discussion of the metamorphic mineral paragenesis, extensive metasomatic activity and related subjects will be presented in later papers.,

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