Rare earth element geochemistry of the Fen alkaline complex,Norway |
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| Authors: | Roger H Mitchell Arild O Brunfelt |
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| Institution: | 1. Mineralogisk-Geologisk Museum, Oslo, Norway
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| Abstract: | Determination of rare earth element (REE) abundances in rocks of the Fen complex has shown that within rocks of the first magmatic series REE abundances increase in the order urtiteFen magmas are discussed and it is considered that parental magmas had relatively high La/Yb ratios (40–60). Utilizing petrological evidence from other alkaline complexes coupled with experimental studies it is considered that the parental magma was a carbonated nephelinite produced by limited (<10%) partial melting of the mantle. All the Fen rocks are placed in a petrogentic scheme in which a carbonated nephelinite magma undergoes liquid immiscibility, differentiation and volatile transport. |
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