Abstract
Based on the investigation of Lower-Middle Jurassic sediments in SW Siberia, isochron reference clay and coal horizons confined to the roof of chronostratigraphic units were identified; bed series from pre-Jurassic formation bottom to U10 coal layer were divided; structural features and distribution of regional cyclites J10-J17 in the sequences and throughout the area were determined.
Highlights
Horizon markers in studied sequences are defined as coal layers (U10, U11, U12, U13, U14, U15), argillaceous formations (Togur suite and middle subsuite of Urman suite) and Jurassic sediments with crust weathering rocks – Paleozoic sediments contact
Chronostratigraphic units in correlating the sequences are cyclites wherein the top are either underlying coal marker layers of continental sedimentation and / or argillaceous formations formed in marine fresh lake basins
Regional cyclites are composed of small priority cyclites which exhibit changing composition orientation from layer to layer and complex texture, i.e. these cyclites are composed of rock layers or beds with gradual and/or sharp boundaries
Summary
The studied area is located within the south-east of Tomsk Oblast, whereas, in terms of tectonic relationship - within the SE West-Siberian platform, to the north of Kalgach meso-block, including Boltnoe, Kazan, Ponomarev, Rogalev, West-Somov and Novosomol uplifting (figure 1).
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