Stephan Mueller Special Publication Series www.stephan-mueller-spec-publ-ser.net 1868-4556 1868-4564 4 Geology, geophysics and tectonics of Northeastern Russia: a tribute to Leonid Parfenov 2009 10.5194/smsps-4-85-2009 http://www.stephan-mueller-spec-publ-ser.net/4/85/2009/ http://www.stephan-mueller-spec-publ-ser.net/4/85/2009/smsps-4-85-2009.html http://www.stephan-mueller-spec-publ-ser.net/4/85/2009/smsps-4-85-2009.pdf 85 96 2009-09-17 Geotectonic setting of the Tertiary Uyandina and Indigirka-Zyryanka basins, Republic Sakha (Yakutia), Northeast Russia, using coal rank data H.-J. Paech hans.paech@arcor.de Federal Institute for Geosciences and Natural Resources, Hannover, Germany now retired Outcrops along the Inach River in the Uyandina basin and those along the Myatis' River in the Indigirka-Zyryanka basin were studied in detail and sampled for coal rank determinations. The Uyandina basin is an intramontane pull-apart basin characterized by extensional structures within the Moma rift system. The coal rank is below 0.3% vitrinite reflectance (<i>R_r</i>), which indicates shallow, immature conditions of basin formation and very low subsidence. The Myatis' River coal-bearing outcrops in the Indigirka-Zyryanka basin reveal compression induced by continent collision. The compressive deformation includes also lowermost Pliocene strata. Due to the position in the Verkhoyansk-Chersky fold belt adjacent to the Kolyma-Omolon microcontinent the Indigirka-Zyryanka basin has much in common with a foredeep, i.e. the asymmetry in thickness and tectonic structure. The vitrinite reflectance data (<i>R_r</i>) which range from 0.25% to more than 5% reinforce the accepted models that describe basin subsidence and geothermal history and the tectonic deformation. Fujita, K., Stone, D. B., Layer, P. W., Parfenov, L. M., and Koz'min, B. 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