TECTONIC IMPLICATIONS FROM THE LITHOLOGY OF LOWER PROTEROZOIC DEPOSITS OF THE UGUI TROUGH (Southern Yakutia)
Yu. V. Davydov
Institute of Geology of Diamond and Noble Metals, Siberian Branch of the RAS, 39 prosp. Lenina, Yakutsk, 677891, Russia
Keywords: Lower Proterozoic, Ugui trough, tectonic setting
Pages: 292-302
Abstract
Mineralogical, petrographic, and petrochemical studies of Lower Proterozoic nonmetamorphosed sandstones and tuffites (Udokan complex) of the Ugui trough were carried out. The Dickinson and Bhatia methods were applied to reconstruct the tectonic settings of provenances. The sequence of Lower Proterozoic petrofacies of the Ugui trough is the same as the sequence of petrofacies of the foreland basin bordering a recycled orogen. The basement of the complex is composed of volcanosedimentary and arkosic petrofacies of rift phase. Above are petrofacies of quartzy and subarkosic arenites transported from the continental block. The section of Lower Proterozoic deposits is crowned with lithic and arkosic arenites supplied from the recycled orogen.
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