SEDIMENTARY FEATURES OF THE LATE PRECAMBRIAN – EARLY CAMBRIAN TERRIGENOUS-CARBONATE DEPOSTS IN THE DZIDOTIAN GUYOT

The Dzhida zone of the southern Baikal region comprises andesite-basalt and sedimentary-volcanic rocks of the Khokhyurt formation and the sandy-shale flyschoid Dzhida formation. This paper presents the results of lithogeochemical study of terrigenous deposits of the Khokhyurt and Dzhida formations, which demonstrate the evolution of terrigenous sedimentation during the geological development of the Dzhida guyot. Thin sandstone lenses of the Khokhyurt formation and turbidite sequences from the Dzhida formation contain mafic or intermediate clasts and fragments of carbonate rocks that composed the guyot caps. New geochemical data indicate that the flyschoid sequence from the Dzhida formation is similar in characteristics to the deposits of active rather than passive margins. Geochemical characteristics and highly fractionated REE patterns of sandstones suggest erosion of island-arc complexes that were contaminated with ancient crustal material during the early stages of their emplacement. Carbonate clasts of the Dzhida formation contain fragments of the Late Riphean and Early Cambrian carbonate formations, but lack the fragments of the Vendian formations that form the closely located margin of the Siberian craton. Nothing in the geochemical data suggests a direct supply of detrital material from the craton. The terrigenous strata of the Khokhyurt and Dzhida formations formed in deep-water fore-arc/back-arc basin settings on the active margin of the Paleo-Asian Ocean. The obtained data indicate that the Dzhida paleobasin was located at a considerable distance from the Siberian craton in the Late Precambrian and Early Paleozoic.

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