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Role of shear along horizontal plane in the formation of helicoidal structures

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Abstract

An unusual structural paragenesis, complicated by brachyanticlines, is revealed for the first time in the sedimentary cover of the West Siberian Plate by 3D seismic surveying. These are linear (in plan view) systems of en-echelon arranged low-amplitude normal faults related to wrench faults in the basement. On different sides off a wrench fault, the planes of normal faults dip in opposite directions, forming a helicoidal structure that resembles the blades of a propeller. In the section parallel to the wrench fault, the boundaries of the beds and normal fault planes dip in opposite directions as well. In the section across the strike of the normal faults converging toward the basement, the beds take the shape of an antiform with a crest sagged along the normal faults (flower structure). This structural assembly was formed as a result of interference of stress fields of horizontal shear in the vertical plane (induced by faulting in the basement) and in the horizontal plane (caused by gravity resistance of the cover). In this case, the displacements along the normal faults develop in both the vertical and, to a greater extent, horizontal directions, so that the faults in cover are actually characterized by normal-strike-slip kinematics. The regional N-S-trending compression of the West Siberian Plate is the main cause of shearing along the NW- and NE-trending faults in the basement, which make up a rhomb-shaped system in plan view. Petroliferous brachyanticlines, whose axes, notwithstanding tectonophysical laws, are oriented in the direction close to the maximum compression axis, are known in the large wrench fault zones of Western Siberia. Our experiments with equivalent materials showed that a local stress field arising at the ends of echeloned Riedel shears within a wrench fault zone may be a cause of the formation of such brachyanticlines. The progressive elongation of Riedel shears leads to the corresponding elongation of the brachyanticlines located between their ends. The performed study has shown that the known types of interference of elementary geodynamic settings such as horizontal shear along the vertical plane + horizontal compression (transpression) and horizontal shear along the vertical plane + horizontal extension (transtension) may be supplemented by combination of horizontal shears along the vertical and horizontal planes, resulting in tectonic lamination. By analogy, we propose to name this type of interference of elementary shear settings translamination. Petroliferous helicoidal structures arise in the given geodynamic setting of translamination.

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Correspondence to M. A. Goncharov.

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Original Russian Text © N.V. Koronovsky, G.N. Gogonenkov, M.A. Goncharov, A.I. Timurziev, N.S. Frolova, 2009, published in Geotektonika, 2009, No. 5, pp. 50–64.

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Koronovsky, N.V., Gogonenkov, G.N., Goncharov, M.A. et al. Role of shear along horizontal plane in the formation of helicoidal structures. Geotecton. 43, 379–391 (2009). https://doi.org/10.1134/S0016852109050033

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