Lithology of Callovian-Oxfordian deposits in various facies districts of the West Siberian Plate
P. A. Yan, L. G. Vakulenko, O. V. Burleva, T. P. Aksenova, and I. K. Mikulenko
Keywords: Lithology, sedimentation settings, lithofacies zonation, Jurassic, West Siberia
Pages: 1897-1907
Abstract
The structure, composition, and formation settings of the Callovian-Oxfordian deposits of the Pur-Irtysh, Taz-Kheta, and Silgin facies districts of West Siberia are considered. In the first of them the Callovian-Oxfordian deposits include the Vasyugan and Abalak Formations; in the second, the Tochino and Sigovsk Formations; and in the third, the Naunak Formation. The variability of the Vasyugan Formation in the southeastern areas of the West Siberian Plate, in the latitudinal Ob' region, and in the Nadym-Taz interfluve has been shown by lithological and mineralogy-petrographical studies invoking production geophysics and geochemical and paleontological evidence. This allows recognition of three facies subdistricts: Ob'-Tara, Ob'-Agan, and Nadym-Pur. In addition, the Yamal-Nadym facies subdistrict, where the Abalak Formation occurs, has been recognized.
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