Geochemical Identification Marks Of Yanshanian Ore-bearing Intermediate-acid Rock About Cu-Mo Deposit In The South Of Chengde

The tectonic setting of the study area belongs to Yanshan platform folding zone in the southern Chengde,the area of the Neoproterozoic and Paleozoic sedimentary cover is very developed,and strong fold and fault happened.Yanshan period Magmatic activity in the region was very strong,has formed a large number of acid-intermediate bodies of Yanshanperiod that is directly linked to endogenous precious metal and polymetallic deposit,and has become an important symbol for finding copper and molybdenum polymetallic deposit in northern Hebei region.However,previous studies mainly focus on single intermediate-acid rock mass,affect the prospecting results.This study provides scientific guidance for better prospecting ideas and improving the prospecting effect,and provides the theory support and basis for the metallogenic regularity and prospecting direction of the Chengde Cu-Mo polymetallic deposit in a more systematicenrichment zone.Through to many aspects study for ore rock of Shouwangfen?Xiaosigou?Taipingcun,including analysis of major elements and rare earth elements,trace elements and isotopic data,were contrasted the ore bearing rock with ore bearing rock,Geochemical identification marks of Yanshanian ore-bearing intermediate-acid rock about Cu-Mo deposit in the south of chengde:associated with copper-based rock is mainly intermediate-acid rock,the content of SiO₂ is 60%-70%,potassium content is slightly lower than that of sodium content in the rock;The mantle source involved in more;Eu negative anomaly degree significantly weakened.And with molybdenum,lithology is mainly acidic rock,the content of SiO₂ is generally greater than 70%,and the rock is characterized by enrichment potassium;Mantle source involved in less,belonging to the product of the anatexis of the lower crust;negative Eu anomaly is significant.At the same time,the joint parameters of SiO₂-Al₂O₃/?K₂O+CaO+Na₂O?,ore-forming elements content and coefficient of variation coefficient,single biotite minerals containing magnesium?MF?,iron coefficient?F?can be used as identification of rock mass containing ore.According to using to the establishedgeochemicalidentificationmarksofYanshanianore-bearing intermediate-acid rock,it is concluded potential Cu-Mo-Au polymetallic and precious metal deposits:Wufenglou?Liubadian?Majiagou?Wazidian?Suiliandong?Xichanggou?Zhangjiagou?Sanzuodian.In addition,through comparing geological and geochemical characteristics of Yanshan intermediate-acid rock with domestic typical ore rock mass,combined with the tectonic location in the study area and the regional metallogenic condition,it is concluded that the formation of a copper metallogenic conditions is weak,but the mineralization of forming molybdenum deposit in this area is favorable.