New data on the age of eclogites from the Belomorian mobile belt at Gridino settlement area |
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Authors: | S G Skublov B Yu Astaf’ev Yu B Marin A V Berezin A E Mel’nik and S L Presnyakov |
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Abstract: | The repeated isotopic and geochemical study of zircons of the eclogite from Stolbikha Island (Gridino settlement area) allows
one to interpret the U-Pb age value of about 2700 Ma by central parts of zircon grains as a magmatic event time, probably
rejuvenated to a degree by intense manifestation of the eclogite metamorphism of about 1880 Ma age. The Svecofennian high-pressure
metamorphism caused a partial recrystallization of zircons of magmatic origin and the appearance of their rims showing typical
geochemical characteristics of eclogite zircons. |
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