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Caledonian Sm–Nd ages and a crustal origin for Norwegian eclogites


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).

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