MODEL RECONSTRUCTIONS OF SUBSIDENCE IN THE KUZNETSK SEDIMENTARY BASIN
O.P. Polyansky, V.V. Reverdatto, and A.N. Fomin*
Institute of Mineralogy and Petrography, Siberian Branch of RAS, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
* Institute of Petroleum Geology, Siberian Branch of RAS, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Sedimentary basin, burial metamorphism, vitrinite, Kuznetsk basin
Pages: 635-644
Abstract
The Paleozoic-Mesozoic history of the Kuznetsk sedimentary basin was studied in terms of a one-dimensional two-layer model for lithosphere extension. The reconstructed curves of subsidence demonstrate two stages of "rapid" downwarping of the basement of depression for about 10-20 Myr, followed by slow subsidence as a result of thermal contraction of the lithosphere for 100-120 Myr. Average horizontal extensions were estimated as 2-fold for the crust, and 5-fold, for the mantle. The maximum paleotemperatures in sedimentary rocks of the depression were estimated at under 300-400
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