Geochemistry and petrology of glaucophane-bearing eclogites and associated rocks from Sunnfjord, Western Norway |
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| Authors: | Erling J Krogh |
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| Institution: | Mineralogisk-Geologisk Museum, Sarsgt. 1, Oslo 5, Norway |
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| Abstract: | Country-rock eclogites and amphibolites in the Sunnfjord area occur as pods, lenses and layers within gneisses of granitic to tonalitic composition. The contacts towards the enclosing gneisses are mostly tectonic, although apparent primary intrusive contacts occur. Geochemical data show that central parts of eclogitic bodies represent fairly undisturbed magmatic compositions, while the margins of such bodies show varying degrees of contamination. Exchange of components with the enclosing gneisses occurred at both a pre-eclogitic and a post-eclogitic stage. Petrographical and petrological data show that the eclogites developed from garnet amphibolites to eclogites during a prograde stage, and that a subsequent uplift/decompression period took place at fairly constant temperatures. The data presented here are compatible with an in situ model for the genesis of Norwegian country-rock eclogites. |
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