--> Abstract: Structure and Tectonophysics of the Ust’-Olenek anticline (Olenek foldbelt, Northern Siberian Craton), by Dmitry Vasiliev; #90177 (2013)

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Structure and Tectonophysics of the Ust’-Olenek anticline (Olenek foldbelt, Northern Siberian Craton)

Dmitry Vasiliev

The northern, near-shelf part of the Siberian platform is promising for the discovery of hydrocarbon accumulations. A series of anticlines considered as potential structural traps extend along the arctic coast of the Laptev Sea. They are combined into a single structure – the Olenek foldbelt, complicating the northern side of the Lena-Anabar depression of the Siberian platform. Analysis of spatial orientation of folds and faults, reconstruction of main paleostress axes, and interpretation of seismic data permitted developing a model of formation of the Ust’-Olenek anticline, one of the largest in the Olenek foldbelt. The early stage is marked by the formation of bedding thrusts, normal faults and NW- striking quartz veins oriented parallel to folding. At the second stage, normal faults, both parallel and orthogonal to fold axis, as well as cross-cutting thrusts and reverse faults form. At the final stage, normal faults of NE-strike prevail. NE-trending strike- slip faults also form at the final stage of folding in the region. The described deformations are presumed to be post-Albian - Senomanian since the rocks of this age are the youngest of all deformed in the area. It cannot be excluded that some normal faults of NW-strike formed much later than folds and that their origin was related to Mesozoic-Cenozoic extension upon opening of the Eurasian ocean basin. This study was partly supported by TGS-NEOPEC Geophysical Company and RFBR grants 13-05-00700 and 12-05-33018.

AAPG Search and Discovery Article #90177©3P Arctic, Polar Petroleum Potential Conference & Exhibition, Stavanger, Norway, October 15-18, 2013