Abstract
Paper discusses the results of U–Th–Pb (LA-ICP-MS) geochronological studies of detrital zircon and Sm–Nd isotopic studies of metaterrigenous rocks of the Udokan complex of the Nizhnekhani graben-syncline in the western part of the Aldan Shield. Based on the data obtained, it was found that the accumulation of terrigenous deposits of the Nizhnekhani graben-syncline occurred after 2.65 and up to 1.9 Ga, probably at the Paleoproterozoic stage of the development of the region. The igneous and metamorphic rocks formed at ca. 2.65, 2.71, 2.82–2.86, 2.99, 3.10–3.21, and probably 3.26–3.42 Ga ago within the Chara-Olekma geoblock, the zone of its junction with the West Aldan megablock and the Kurulta block of the Stanovoi suture zone, were the sources of detrital material. Metaterrigenous rocks of the Nizhnekhani graben-syncline were formed from sources with the Paleo- and Mesoarchean Nd model ages, while a significant contribution of the Paleoproterozoic juvenile material was established for the metasedimentary rocks of the Kodar-Udokan trough. Significant differences in the age and Nd isotopic characteristics of terrigenous deposit sources of the Nizhnekhani graben-syncline and the Kodar-Udokan trough suggest that they accumulated in isolated basins.
Published Version
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