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Stephan Mueller Special Publication Series An open-access serial publication for refereed proceedings and special publications
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Articles | Volume 4
Stephan Mueller Spec. Publ. Ser., 4, 85–96, 2009
Stephan Mueller Spec. Publ. Ser., 4, 85–96, 2009

  17 Sep 2009

17 Sep 2009

Geotectonic setting of the Tertiary Uyandina and Indigirka-Zyryanka basins, Republic Sakha (Yakutia), Northeast Russia, using coal rank data

H.-J. Paech H.-J. Paech
  • Federal Institute for Geosciences and Natural Resources, Hannover, Germany
  • now retired

Abstract. 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 (Rr), 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 (Rr) which range from 0.25% to more than 5% reinforce the accepted models that describe basin subsidence and geothermal history and the tectonic deformation.

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