Литосфера (Feb 2017)
New geological and geophysical interpretation of potential fields in the area of Middle Urals transect. Article 2. East of the Urals and Western Siberia
Abstract
A new 2D model had been built for the geological structure of the Urals and West Siberia along the eastern part of Europrobe seismic reflection profiling in the Urals (ESRU) up to the depth of 15 km. For the first time at the cost of anomalous fields analysis on the parallel profiles applicability of the method was evaluated in the course of density and magnetic susceptibility modeling. The fulfilled studies have confirmed high quality of works of the ESRU’s authors under guidance A.V. Rybalka. Our model makes more concrete ideas on earth crust structure along ESRU. It is shown that actual width of the Platinum Bearing belt is much bigger than shown on geological maps. Into Serov fault zone two meridional ultrabasites plates of different degree of serpentinization were singled out. In the most eastern one according to the model can assume the presence of chromites. The most significant difference of the West Siberia part of ESRU (beginning approximately from 390 km of the model) from more western “Uralian” parts is the bigger “stretching” of entire structures of earth crust. We suppose that this structure stretching and raising of deep metamorphic rocks is a consequence of early Triassic stretching accompanied by forming Triassic systems of West Siberia graben-rifts.
