Scientific journal
Scientific Review. Geographical Sciences

Personal portfolio

ZONING OF PRIMARY GEOCHEMICAL HALO OF THE TYKOTLOVSKY PYRITE-POLYMETALLIC OCCURRENCE

Лебедев Г.В., Аптыков А.Р.
Object of study is located in the area of the polar Ural megantiklinory. Ore-bearing sedimentary-volcanic sequences of early Ordovician age split into under-ore, ore and upper-ore horizons. Steeply dipping ore deposits occur in accordance with the host rocks. They have reservoir lenticular shape, length to drop of tens meters and thickness up to a few meters. Study zoning of dispersion halos was conducted on materials lithochemical sampling (2374 samples) of 13 exploratory boreholes. Compilation of information was carried out by statistical and graphical methods using a standard program (MS Excel). On the results of the calculations of correlation coefficients there were identified three paragenetic associations of elements: 1) Cu-Zn-Pb-Ag-Cd – Typomorphic; 2) Co-V-Ti-Ni-Sc-Mn-Cr which are characteristic for the basic rocks of enclosing complex; 3) Ba-Y-Yb-Zr-Nb which related with magmatic rocks of high alkalinity. Zoning of halos was detected by charting of changes in the content of elements and indicators of multiplicative association elements in wells. Also there was carried out the calculation of indicators of zoning and zoning gradient. The maximum accumulation of Ni, Co, V, Ti, Mn, Sc in upper-ore horizon, Cu, Zn, Pb, Ag, Yb - in the ore, and Zr, Cr, Cd, Ba, Y, Nb - in under-ore. Fixed of range zoning has the following form (bottom-up): Ba-Nb-Y-Cr-Zr-Cd-Ag-Pb-Zn-Yb-Cu-Bi-Sc-Ni-Mn-Ti-Co-V. He fundamentally contradicts with series zoning characteristic of massive sulfide deposits. The authors suggest that the reason for the contradiction is the ore-bearing stratum of ore is overturned bedding. Under-ore and upper-ore horizon are respectively upper-ore and under-ore horizon. The resulting range of zoning should read exactly the opposite: V-Co-Ti-Mn-Ni-Sc-Bi-Cu-Yb-Zn-Pb-Ag-Cd-Zr-Cr-Y-Nb-Ba. Zoning range can be used in the search for massive sulfide deposits in the region of study.