Structure and sedimentary formations of the northern Yana-Kolyma Fold System, Yakutia |
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Authors: | A A Konstantinovsky and L N Lipchanskaya |
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Abstract: | The structure, geodynamics, and sedimentary formations of the northern Yana-Kolyma Fold System and the adjacent part of the
Verkhoyansk Fold System are considered on the basis of the published sheets of the State Geological Map on a Scale of 1: 200000,
field observations of the authors, and literature sources. The important structure-forming role of the frontal uplift of the
Kolyma-Omolon Superterrane that was thrust over in the northwestern direction is shown. The at-least-twofold shortening, thrust
faulting, and large-scale offsets of the large blocks of the distal part of the Verkhoyansk continental margin and the Nagondzha
paleotrough are related to this effect. An attempt is made to settle some debatable questions concerning the tectonic position
of the Kular Uplift, the cause of the inconsistent structural patterns of the Jurassic and Triassic sequences at the southwestern
margin of the Polousnyi Synclinorium, the counter vergence of folds in its northern and southern zones, the regional tectonic
evolution in the Late Jurassic, and the eastward change in the composition of the heavy clastic mineral assemblages contained
in the Upper Triassic and Jurassic rocks. |
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