| The Yingzuishan tectonic altered rock type gold deposit, located in North Qilian Caledonian Orogenic Belt, is one of the important mineral deposits in western Gansu formed the "Golden Triangle". With years of mining, the deposit come to face a serious crisis of resources.looking up follow-up resources has become a serious problem. In this paper, geochemical exploration methods as key to predict in deep and peripheral, on the basis of metallogenic geological background we deepened. The main research results are as follows:This paper, according to the vein intercalated relationship, mineral assemblages and metasomatic relations, determine that mineralization has the characteristics of multiphase multi-stage stack, and the ore-forming process is divided into primary mineralization stage and supergene stage, primary mineralization period is also divide d into three metallogenic stages:a、pyrite-quartz stage;b、quartz-pyrite stage; c、 quartz-polymetallic sulfide stage. Wall rock alteration from the ceiling to the floor has a certain zonation, they are sericitization'silicification, pyritized'carbonation' serpentinization, talcization.Through the debris survey inzone Ⅰ, primary superimposed halo measurement inzone Ⅱ and stream sediment survey inzone Ⅲ, found out the distribution characteristics of regional geochemical elements.Through the methods of mathematical statistics, determined the optimum geochemical metallogenic logo elements combination. Principal component analysis extracted five factors, Fl:Au、 As、Sb、Hg、Sn(Pb、Ag); F2:Cu、Pb、Zn. Bi;F3:Ti、V、W; F4:Co、 Ni; F5:Mn、B. Using factor analysis method to judge element combination results are basically the same to correlation analysis, cluster analysis.Background value and geochemical anomaly threshold determination is the basic problem, related to whether the survey identified information related to mineralization mineralization. This paper select debris survey Au element as an example,and compare the difference between the mean standard deviation method, cumulative frequency method, histogram method and multi-fractal method in terms of determining the background value and the anomaly threshold, and select suitable method for determining and delineat anomalies.An integral axial zoning sequence of primary halo is established by using Grigorian’s method, and zoning sequence from bottom to top is Au-W-Mn-Zn-Hg-Sb-Cu-Co-V-Ti-Ni-Ag-B-Pb-Bi-As-Sn-Mo, zoning sequence is complex and confusing, also appears anti-zoning phenomenon and indicates multi-additive effect of hydrothermal mineralization. Geochemical parameters emerge complicated trend of decreases'ncreases'decreases from the surface to the deep.Combined with ore grade contours trend, indicating a large ore body extends to the deep or existing deep blind ore body with good prospecting potential.Through the study of Yingzuishan gold deposit geochemical parameters and primary superimposed halo, summed up the deposit primary superimposed halo model features and deep prediction flag.Finally, the prospecting targets were determined by combining geochemical anomaly and geological phase for metallogenic prediction, part of which had been selected to verify the project to determine the effectiveness of geochemical prospecting guide. The typical deposit by primary superimposed halo (primary halo) model and prospecting mark of determination, can provide a reference value for the regional metallogenic prediction of the same type. |
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