The main geodynamic border and seismic visualization of plumes under the East European Platform
Journal Title: Геофизический журнал - Year 2019, Vol 41, Issue 1
Abstract
According to the Taylor approximation method of the three-dimensional P-velocity mantle model under Eurasia, seismic imaging of the manifold plumes and super-deep fluid processes of the East European Platform was carried out. As the source data, the time of the first wave of R wave entry according to the ISC bulletins from 1964 to 2006 was used. The fluid domain is defined as the region of distribution of low-speed inhomogeneities from the lower, middle mantle to the upper and spreading laterally in the upper end of its central part. The central, low-speed part of the fluid domain is defined as a plume. On the territory of the East European platform, the North-Azov, Volyn-Orsha, Moscow, Timan, Belomorsky, Varanger and Schelfteo plumes are highlighted. In the area of spreading the data of mantle domains, there are 19 super-deep mantle fluids. By the nature of the behavior of the gradient of velocity with depth, the main geodynamic boundary (the boundary between the upper and middle mantle) is constructed, which within the East European platform ranges from 525 to 700 km. According to the depths of the main geodynamic boundary, the East European platform is divided into Fennoscandia (575 km), Sarmatia (divided into two parts with depths of 575 km and 600—625 km) and Volga-Uralia (625 km). The main geodynamic boundary of the Barents Sea plate is divided into East and West (525—550 km). For the given main geodynamic boundary, the reduction of the gradient of speed (sharpness) from north to south from 0.734 s–1 in the mantle under the archipelago Medvezhy to the average is mostly £ 0.2 s–1 in the mantle North of 55° northern latitude.
Authors and Affiliations
T. A. Tsvetkova, I. V. Bugaenko, L. N. Zaets
Keywords
Related Articles
- EP ID EP485805
- DOI 10.24028/gzh.0203-3100.v41i1.2019.158868
- Views 95
- Downloads 0
Study of the piezoelectric sensor KD-35 properties on the calibration device by the method of external pulse and on a real Earth track
Microseismic monitoring of rock mass, such as mines, will provide data about condition of mass on the borders of waste areas at different levels of implementation of mining. The main problems of monitoring are the inform...
Geophysical model of the mantle ore-forming system
The paper deals with a generalized geophysical model of the mantle ore-forming system that covers three main parts: a) the area of origin of the ore substance; b) its transportation zone and c) the area of concentrated o...
Basement oil of sedimentary basins is an alternative of “shale” scenario of global FEC development (West Siberia as an example)
Concepts on structure, composition and oil presence of the West Siberia basement are considered in the paper. Information on oil and gas presence in the basement of the world is presented, its inexhaustible potential is...
Velocity typing the middle and lower mantle of Europe
We used 3D P-velocity model of the mantle of Europe. The model was constructed by V. S. Geyko proposed method of Teylor approximate solution of seismic tomography. The velocity structure of the middle and lower mantle of...
Determination of areas of gas methane accumulation in carbon-mass massives by transient electromagnetic sounding method (on the example of the San Juan coal basin; USA)
According to the results of the research with the method of point electromagnetic sounding (PEMS) of the area of the coal basin of San Juan the criteria were obtained for the allocation of plane anomalies; promising for...