Analysis Of Metallogenic Potential Of Fuquanshan Rock Mass In Dexing,Jiangxi Province

The Qinhang metallogenic belt is an important multi-metal metallogenic belt in China.It is located at the splicing site of yangzi plate and Huaxia plate.Its metallogenic period is mainly Yanshan period,and it is closely related to granite.Fuquanshan rock mass is located in the East section of the metallogenic zone and is located in the deep fault zone of northeastern Jiangxi.This paper studies Fuquanshan rock mass from its geological features,petrology,geochemistry and LA-ICP-MS zirconite U-Pb dating,and discusses its similarity with the metallogenic rock mass of typical deposits in the region.Then analyze its metallogenic potential,and make the following research progress:(1)Fuquanshan rock mass is a rocky plant,and the rock type is spotted black mica granite.It invades into the shallow Metamorphic rock system of the Neoproterozoic.The contact zone develops thermal contact erosion,and its rock type is feldspar quartz hornfels.The keratinous rocks and diagenetic thousands of rocks.The northern part of the rock mass is in contact with the carbonate rock formation of the Carboniferous Huanglong Formation,and the contact zone is calcified.The rock type is Garnet calciferous.The southern surrounding rock of fuquan mountain rock mass has a sliding structure and a series of northeastbound fault structures.The petrochemical composition of Fuquanshan rock mass is shown to be high potassium calcium alkaline granite series,which has the characteristics of high Silicon,high alkali,high potassium,low calcium and low magnesium.The Nb/Ta ratio is much lower than the average crustal value and the corresponding value of the original mantle;The total amount of rare earth elements is very low,and there is a downward trend from the Dongjiawu unit to the left unit,with a significant Eu negative anomaly,?Eu value is 0.12~0.14,light and rare earth fractionation is obvious,light rare earth enrichment,and heavy rare earth loss.(La/Yb)_N value is 7.9~12.7.The results of the zircon U-Pb dating analysis of the rock mass showed that the ages of the two groups were 129±1.4 Ma and 133±1.5 Ma,respectively,indicating that the Fuquanshan rock mass was formed in the Early Cretaceous of the extension environment of the Jiangnan orogenic belt and was formed by magma activity in the late Yanshan period.Based on the analysis of petrology and geochemical characteristics,the source area of the rock mass may be the shallow Metamorphic sedimentary rocks of the Neoproterozoic Wannian group and a small amount of medium-acid magmatic rocks,with a small amount of mantle material involved.(2)Fuquanshan rock mass is compared with the metallogenic rock mass of Zhuxi tungsten copper mine.It is highly similar in the characteristics of rock mass,main elements,trace elements and rare earth elements,as well as rock mass diagenesis era and tectonic environment,and has Geological conditions for the formation of tungsten ore beds.(3)In the northern part of Fuquanshan rock mass and the tectonic deformation area of the southern surrounding rock,there are tungsten occurrences and good tungsten anomalies,indicating that tungsten ore metallogenic potential is relatively large in these parts.