MORPHOTECTONICS OF THE BASEMENT SURFACE OF THEWEST SIBERIAN BASIN WITHIN NADYM-TAZ INTERFLUVE

作者：DEYEVE.V. ZINOVIEVS.V.

摘要：The map of reflecting horizon A, plotted on the basis of regional geophysical materials, yieldsinformation about the bottom topography of sedimentary cover of the West-Siberian Basin within Nadym-Taz interfluve. Through morphotectonic analysis about this surface, the authors are able tounderstand the distribution characteristics of the main topographic irregularities, with the blockstructure of the lower cover floors and underlying complexes as the focus.The largest irregularities are caused by the presence of three regional altitude steps, which show a regional tendency of basement being submerged in the north-north-east direction. Within these irregularities, the authors have distinguished some regions, which can be divided, based on the characteristics of morphostructural distribution, into two groups, i.e., areal (Nadym, Tol'ka, Urengoy)and belt (Tarko-Sale, Russko-Chasel'ka and Messoyakha). The first ones represent quasihomogeneous blocks, whose surfaces are complicated by irregular low-amplitude elevations and troughs and low-gradient zones with gradient values being up to 0.03, or they submerge stepwise, with the leveled areas being separated by zones with high gradients (0.07-0.15). The morphostructure of the other group of regions is characterized by the en-echelon distribution of contrastingly positive and negative elements with high values of slope gradients (higher than 0.1-0.2).

发文机构：InstituteofGeologySBRAS

关键词：低壳形态西伯利亚地区西部盆地江河分水区底层表面地球物理数据边缘地盖确定盆地研究morphotectonicsbasementSiberiainterfluve

分类号： P542[天文地球—构造地质学][天文地球—地质学]