Abstract
New data on the geology and stratigraphy of the Upper Jurassic-Lower Cretaceous deposits of the eastern part of the Oloy zone (upper reaches of the Oloy, Ilguveem, Aluchin rivers), including the description of sections, lithological-petrographic and paleontological characteristics of volcaniclastic sedimentary deposits, the results of petrological-geochemical study of volcanic rocks and their isotopic dating are presented. Two concordant dates were obtained using the zircon U-Pb method: 147±2 Ma (Elomskaya Formation) and 140±2 Ma (Glukhovskaya Formation). The island-arc nature of the studied formations is proved, the accumulation conditions and geodynamic settings of all stages of the formation of the volcanic-sedimentary complex in various structural-facies zones are characterized.
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