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Ilmenite as a Source for Zirconium during High-grade Metamorphism? Textural Evidence from the Caledonides of Western Norway and Implications for Zircon Geochronology |
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| Authors: | BINGEN BERNARD; AUSTRHEIM HAKON; WHITEHOUSE MARTIN |
| Institution: | 1GEOLOGICAL SURVEY OF NORWAY, LEIV EIRIKSSONS VEI 39, N-7491 TRONDHEIM, NORWAY 2MINERALOGISK GEOLOGISK MUSEUM, UNIVERSITY OF OSLO, N-0562 OSLO, NORWAY 3SWEDISH MUSEUM OF NATURAL HISTORY, SE-104 05 STOCKHOLM, SWEDEN |
| Abstract: | The Proterozoic Lindås Nappe, part of the Caledonidesof western Norway, was affected by penetrative Sveconorwegiangranulite-facies metamorphism, followed by a fluid-driven eclogite-and amphibolite-facies Caledonian overprint, spatially restrictedalong fractures and shear zones. In mafic granulites and amphibolites,a luminescent anhedral zircon overgrowth, which gives an averageage of 924 ± 58 Ma (Th/U = 0·52; secondary ionmass spectrometry data), surrounds a magmatic zoned core withan age of 952 ± 32 Ma (Th/U = 1·27). In the granulites,a continuous rim of zircon or a discontinuous corona of |
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