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Rare earth elements in some igneous rocks in the Oslo rift, Norway |
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| Authors: | Else-Ragnhild Neumann Arild O Brunfelt Kjell G Finstad |
| Institution: | a Mineralogisk-Geologisk Museum, Sarsgt. 1, Oslo 5, Norway b SAGA Petroleum Company, 1300, Sandvika, Norway |
| Abstract: | Rare earth element (REE) concentrations have been determined for 27 plutonic rocks in the Permian Oslo rift, including kjelsåsite/larvikites, lardalites, nordmarkites, ekerites and Drammen granites. The kjelsåsite/larvikites from different parts of the rift have very similar REE concentrations and must be derived from a source or sources homogeneous with respect to REE. The genetic relations between the kjelsåsite/larvikites and the other rocks were tested by comparing observed REE enrichment factors with calculated ones based on hypothetical fractionation relations derived from petrographic mixing calculations. Several of the analyzed nordmarkites may be derived from kjelsåsitic/larvikitic parent magmas: the ekerites are closely related to the nordmarkites. |
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