Extraction Of Geochemical Anomaly Information Of Au And Its Related Elements And Its Metallogenic Prospect In Aldan Obo, Inner Mongolia

Aldan obo area is the important placer-gold, platinum deposit, but there are no breakthroughs of finding primary gold deposit. The area is the low terrain characteristics and geomorphological features, so the paper first use systematic method of stream sediment sampling to deal with the new data with computer technology on the gold anomaly processing, and analysis and forecasts for the mineralization.The 15 elements including Au, Ag, Cu, As, Pb etc. are calculated the correlation coefficient between the variables using the method of mathematics, and analyzed reliability analysis. When the reliability is 0.5, the three elements of Au and As, Sb is relevant. And then, based on Geoexpel-technology platform, the geochemical data is processed, and for discrete data grid, drawing the distribution map of gold and other elements of the element. Through the collation of data, the threshold anomaly is determined using a different method: data mean and standard deviation to determine abnormal minimum; excluding elements of different points of the normal distribution to determine threshold anomalies; Excluding the number of different points of the lower limit of normal elements identified anomalies; Determine the minimum percentage of abnormal, and comparing the four methods. With local geological conditions, we determined the threshold, and drawn the single-element geochemical maps, abnormal anomaly map and comprehensive abnormal map. A-key target area is determined as abnormal location with classification of abnormal levels.With the geological conditions on the A-abnormal area for further analysis and interpretation of abnormal done, A-abnormal area mainly controlled by Stratum and Stratum east-west fault, the main stratum of A-key target are Jixian System, Bayan Obo Group, and Hala Huo wart group, the lithology is gray, gray ceramics containing carbon black marble, marble sheet microcrystalline green mud folder epidote schist, slate; gray, black sericite quartzite, carbonaceous sandy phyllite, metamorphic quartz sandstone laminar crystalline limestone which is sedimentary characteristics with normal sea water, and hot water sedimentary characteristics, reflecting likely the deposition of submarine hydrothermal activity and some hot water sedimentary material added. As the sedimentary rocks tectonic environment mainly is environment of passive continental margin, owning certain metallogenic potential, the possibility of the formation of large gold deposits is existed.