50th Anniversary of the International Geophysical Year
and Electronic Geophysical Year
16-19 September 2007 • Suzdal, Russia
Complex model of tectonic evolution of the earth crust structural blocks and radioactive waste disposals locationsS. V. Belov1, A. D. Gvishiani1, E. N. Kamnev2, V. N. Morozov1, and V. N. Tatarinov1 1Geophysical Center, Russian Academy of Sciences, Moscow, Russia 2VNIPI Promtechnology, Moscow, Russia
Disposal of high level radioactive wastes (HLRW) in geological formations for a time of 104–105 years is, at present, the only possibility of its removal from the biosphere. Therefore, selection of crust sites, in which the ecological safety of HLRW isolation is ensured for its lifetime, is an acute problem in Russia, as well as in: many developed countries. Evaluation of geodynamic and tectonic processes velocity with time, as well as their effects on isolation properties of structural tectonic blocks is a principal condition ensuring safety of HLRW disposal. From practical viewpoint, it is important (area of Krasnoyarsk in Siberia) to predict crust blocks evolution of Nizhnekansky granitoid massif in Russia where work is being carried out to select a site of underground laboratory construction. At the same time, it is well known that this area belongs to the zone of active orogenesis and its long-term geodynamic stability has not been studied yet. The methods to predict tectonic blocks evolution when selecting sites HLW disposal sites is based on the following principles:
1. Evolution of the Earth's crust is related to the intensity of tectonic processes development in the region. The decisive factor is the initial level of effective tectonic stresses, block structure of the environment and physical and mechanical features of a rock massif.
2. Tectonic stress field varies in time and space retaining the inherited tendencies of the preceding period of the region tectonic development. Corresponding indicator is the degree of dislocations, geomorphologic characteristics and other features of the geological environment.
3. Modern stress and strain of the geological environment combined with the inherited time-space variation of local fields of tectonic stress determine the development of geomechanical processes of deformation and destruction in each individual region and the possibility of forming new tectonic faults or activating existing faults (zones of weakness and others). It is planned to develop a dedicated finite-element program complex as a calculating tool of modeling stress and strain variation in rocks with time.
The study is supported by RFFI (grant no. 05-05-64975) and ISTC (project no. 2764).Citation: S. V. Belov, A. D. Gvishiani, E. N. Kamnev, V. N. Morozov, and V. N. Tatarinov (2007), Complex model of tectonic evolution of the earth crust structural blocks and radioactive waste disposals locations, in: Materials of the International Conference '50th Anniversary of the International Geophysical Year and Electronic Geophysical Year', GC RAS, Moscow, doi:10.2205/2007-IGY50conf. © 2007 Geophysical Center RAS and authors