METHOD OF PREDICTING BLIND ORE BODY ASSOCIATED WITH GRANITOIDS

摘要

FIELD: physics.SUBSTANCE: method includes constructing a "zero" depth model for potential ore-bearing areas based on a database of physical properties of rocks making up the model section, and materials of small-scale gravitational and magnetic exploration. The "zero" depth model is in the form of depth sections on which all detected bodies are assigned corresponding intervals of variation of density and magnetic characteristics. The depth model is interactively selected by solving a series of inverse problems. When selecting the depth mode, the shape of separate model bodies and physical parameters thereof (density and magnetisation) are varied until the calculated gravitational and magnetic fields almost match the observed fields. The obtained non-uniform distribution of rock density and magnetisation is interpreted using reference genetic models of the ore-magnetic systems, with construction of geologic-geophysical profiles. On -geophysical profiles with a sharp change or displacement of isolines of the density and magnetisation fields, large faults and regions of low-density nonmagnetic rocks are selected as residual sources of cotectic granites (sources of fluids, ore substances and energy), and off-shoots therefrom are delineated as the predicted ore deposit zones.EFFECT: predicting a blind ore body associated with granitoids with high reliability.8 dwg