Journal
DOKLADY EARTH SCIENCES
Volume 431, Issue 1, Pages 318-323Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S1028334X10030128
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Funding
- Russian Academy of Sciences [2.3.2009]
- Russian Foundation for Basic Research [08-05-98815-r_sever_a]
- Arizona Laserchrone Center [NSF-EAR 0443387, 0732436]
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Using local procedures, the new results on the isotope ages and composition of mineral inclusions were obtained for detrital zircons from Paleoproterozoic Jatulian terrigenous quartzites and polymictic conglomerates in Central and Western Karelia. For Eastern Laurasia, signs of the existence of Hadean and ancient Eoarchean matter were found for the first time (zircon grains of 3871 +/- 38.6 and 3837 +/- 42.1 Ma concordant ages). The multimodal distribution of ages within 3.45-2.61 Ga was revealed. The discovery of the oldest zircon grains provides the conditions for valid global correlations of geological events that determined the deposition and formation of the continental crust of the North Atlantic supercraton.
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