The Relationship Between Lithology Characteristics And Mineralization Of Xutangkeng Molybdenum Mineral Deposit In Longyan City, Fujian Province

The west-south area of Fujian is an important metallogenic concentration zone in the east-south region of our country.The complex structure architecture pattern and intensive magmation contributed to the mineralization and ore-forming such as iron,copper and molybdenum mineral deposit.The Xuetangkeng molybdenum mineral deposit locates in Sankeng village,Shizhong town,Longyan city,Fujian province.As far as region is concerned,Xuetangkeng molybdenum mineral deposit sits on the contacting belt which is between Zhenhe-Dapu regional fault and the biotite granite mass.So it is superior in the ore-forming condition,and the foreground is of advantage in prospecting molybdenum poly-metal mineral deposit.Applying the multi-subject knowledge such as petrology,structure, gitology,geochemistry of trace elements and mineral deposit geochemistry and contrasting to the geological characteristics of exiting molybdenum mineral deposits,the relationship between lithology of granite and mineralization has been systematically studied.The granite mass in the district is the 3rd intrusion rock in early-Yanshanianand belongs to the Dayang granite mass.At the aspect of the lithology,it is mainly biltite monzonitic granite,and it is abundant of silicon and alkali but deficient of iron and calcium.Contrasting with the other molybdenum,this granite mass is convenient to the mineral enrichment,so the area has a good prospect.Based on the analysis,following conclusions have been induced. Firstly,because of the multi-time and frequent tectonic activities,a series faults had been formed.Secondly,because the magma of the Dayang granite mass got a thoroughly evolution and contributed to the enrichment of the metallogenic matters and the lithology of the granite is compacting, so it became a good "blocking bed".Accompany with the activities of volatile component such as F~-,Cl~-,the bearing mineral hydrothermal fluid developed on the contacting belt of rock mass and wall rock and the faults of the wallrock.As a result,a molybdenum mineral deposit of skam type was formed.Based on the analysis above,the metallogenic matters mainly originated from the Dayang granite mass and it is the matrix of the molybdenum mineral deposit.