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Доповіді НАН України. – 2008. – N 1. – С. 115–118.
Возраст литосферного источника вендских траппов Волыни
Л.В. Шумлянский, А.А. Носова
Abstract
The paper deals with comparison of the Sm–Nd model ages of the whole-rock
samples of Vendian (ca. 550 Ma) continental flood basalts of the Volyn
region and 207Pb/206Pb ages of zircons isolated from basalts.
Sm–Nd model ages vary between 2050 and 1090 Ma with two spikes at
1500–1700 and ca. 2000 Ma. 207Pb/206Pb zircon ages form four
groups: ca. 2000, 1820, 1470 Ma, and (549 ± 29) Ma. The former age
corresponds to the time of basalt eruption. Sm–Nd model and
207Pb/206Pb zircon ages reveal good correspondence to the age of
crust formation and stabilization of the lithospheric mantle in the western
(svecofenian) part of the East-European craton and evidence about a
significant role of the lithospheric source. Role of the plume material was
impaired but increased drastically at the latest stages of magmatism.
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