Genetic relationship between eclogite and hornblende + plagioclase pegmatite in western Norway |
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| Authors: | David H Green Bjørn O Mysen |
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| Institution: | 1. Department of Geophysics and Geochemistry, Australian National University, Canberra, Australia;2. Mineralogisk-Geologisk Museum, Sars gt. 1, Oslo 5, Norway |
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| Abstract: | The role of water during metamorphism of eclogites and surrounding quartzofeldspathic gneisses in western Norway has been studied. The appearance of small patches and veinlets of hornblende+plagoclae+quartz(+biotite+garnet) is attributed to partial meltiing of gneisses adjacent to eclogite in a high pressure metamorphic terrain (P > 8 kb, T > 600°C, approx.). This melting is responsible for the lowering of PH2O during metamorphism whereby the interlayered mafic were pre- or synmetamorphic mafic intrusions and accumulates which retained an essentially anhydrous character during metamorphism. |
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