Abstract:

It presented acidic volcanic rocks at upper Jurassic Manketouebo Group.According to the lithologic characteristics，it can be divided into eruption facies，the overflow facies and volcanic sedimentary facies，moreover，mineralized alteration mainly showed silicification，sericitization，chloritization，epidotization，carbonatization，but pyritization and molybdenum mineralization in local area.Volcanic rocks exposed and it was found that Mo and Ag elements in surrounding area exhibited 1∶50 000 chemical exploration anomaly with high strength and large scale； through the anomalies，Mo element peak was 433.4 μg/g and Ag element peak was 3.09 μg/g.Additionally，Mo and Ag elements has the feature of obvious enrichment and strong differentiation in volcanic rock and soil samples with main elements of SiO₂ whoes content is 72.30%~74.26%，overall，it showed high silicon，aluminum，high degree of differentiation，high potassium calc-alkaline series.The amount of rare earth elements（ΣREE） was high with an average of 173.38×10^-6，moderate negative europium anomaly，light and heavy rare earth obvious fractionation，enrichment of light rare earth.After comprehensive analysis，we concluded that the study area has formed potential of molybdenum and silver associated with late Mesozoic acidic volcanic rock and ground.

Key words: comprehensive geochemical anomalies, acidic volcanic rock, geochemical characteristics, anomaly verification, molybdenum and silver deposit