Abstract

An alteration pattern, in many ways resembling that known from the Climax porphyry-molybdenum deposits, has been found in the central part of the Glitrevann cauldron in a late, stock-shaped intrusion consisting of aplitic granite and quartz-feldspar-porphyry. Sericitic alteration is the most dominant exposed feature of the mineralization. Below the sericitic alteration occurs a stockwork of molybdenite mineralization, which is thought to be the uppermost part of a possible orebody.The Bordvika Mo mineralization is found in a subvolcanic environment in contradistinction to that of the nearby Drammen granite where molybdenite-bearing quartz veins are found in plutonic rocks. Both the Glitrevann and the Drammen granite Mo mineralization belong to a major biotite granite complex in the central part of the Oslo rift.A classification of the granite-hosted Mo mineralization within the Oslo rift is proposed. It seems as if the Oslo rift Mo mineralization can be classified according to its apical position in the granite.

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