Литосфера (Apr 2016)
The nature of trend anomalies of natural radioactive element ratios on the Dzhalinda-Tommot profile
Abstract
In the southern of Far East Russia region, the principles of the constant ratio of natural radioactive elements (NRE) has been formulated by the author using a large volume of statistical data, supported by mathematical computations and affirmed by a long-term field experience. It was developed the basis for determination of geodynamic types of the magmatic (MC) and structural-substantial (SSC) complexes using trends of NRE ratios (trends of the ore type and magmatism). A field experience affirms a lot of anomalous cases that do not adhere to the stated principles; it is necessary to clarify the causes for their occurrence. The characteristics of Archean complexes of the region have almost not been taken into consideration in development of above mentioned principles; therefore, these principles are still not universal and need further improvement. For this purpose, the average values of NRE ratio in MC and SSC obtained along the reference profile Dzhalinda-Tommot are analyzed jointly with the deep modeling data (based on seismogravitational, MTS and geothermal profile data). Particular attention is paid to distinguishing the areas where MC and SSC with anomalous NRE ratio are concentrated; their relationship with the features of the deep structure of the region has been proven. The lowered requirements for the accuracy of the method and relative simplicity of processing allow using the fund materials of the past years airborne geophysical surveying scale of 1 : 200 000-1 : 5 000 000 and simplified methods for estimation of average NRE ratio characteristics.
