Multi-textured garnets from a single growth event: an example from northern Norway |
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| Authors: | AHN RICE D ROBERTS |
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| Institution: | Geology Department, University College Cardiff, Cardiff CF1 1XL, Wales, UK;Norges Geologiske Undersøkelse, Boks 3006, N-7001, Trondheim, Norway |
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| Abstract: | Abstract Textural relationships between porphyroblasts of biotite and garnet in metasediments in the Nordkinn Peninsula area of the Finnmarkian Caledonides of North Norway are apparently complex. There is evidence for two textural zones in both mineral phases and superficially the development of these appears to have overlapped, at least in part, in time and space. This apparently complex porphyroblast growth history can be considerably simplified if only one period of garnet growth occurred and if different inclusion fabrics developed where garnet replaced biotite porphyroblasts and where it overgrew the matrix foliation. The possibility that porphyroblasts with textural evidence for multiphase growth histories actually grew during a single crystallization event is of importance in the interpretation and elucidation of tectonometamorphic relationships. |
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| Keywords: | Key words: biotite Caledonides garnet Norway replacement textures |
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