Abstract
Sm–Nd dating of minerals in several Norwegian country-rock eclogites reported here indicates that the rocks crystallized ∼425 Myr ago. The isotopic composition of both Nd and Sr in these eclogites suggests that they formed from much older crustal rocks. The high-pressure metamorphism of which the eclogites are relics probably involved subduction of the continental Baltic plate as it was overridden by the Greenland plate during the Caledonian orogeny.
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Griffin, W., Brueckner, H. Caledonian Sm–Nd ages and a crustal origin for Norwegian eclogites. Nature 285, 319–321 (1980). https://doi.org/10.1038/285319a0
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DOI: https://doi.org/10.1038/285319a0
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