Geochemical Characteristics Of Ore Rock In The Luming And Cuiling Mo Deposit, Heilongjiang Province

The Lesser Xing’an Range-Zhangguangcai Range polymetallic metallogenic belt isone of the important molybdenum metallogenic belts in Heilongjiang Province.Luming-Cuiling molybdenum deposit is located in Yichun Fe-Pb-Zn-Mo-W-Sn-Cu-Agore-forming subbelt, northern section of Lesser Xing’an Range-Zhangguangcai MountainFe-Pb-Zn-Cu-Mo-Au-W-Sn Crystal pyrite metallogenic belt, Jilin-Heilongjiangmetallogenic province. It was classified as Lesser Xing’an Range-ZhangguangcaiMountain molybdenum ore-concentrated area according to the distribution pattern andcharacteristic in China by Huang Fan and Chen Yu-chuan et al. Luming porphyrymolybdenum deposit, Cuiling mineral occurrence situate in Luming Mo-Pb-Zn ore field.The porphyry molybdenum deposits in this region were mainly formed in Yanshan Periodand most age date of them were during160and197Ma, directly related to a largequantities of granitic magma intrusion activities that due to the intense subduction andsqueezing action of Pacific plate.This paper is mainly concerned on the petrology and geochemistry features in theore-concentrated area. In the meanwhile, we obtain zircon U-Pb age of the rock mass andRe-Os dating of Luming molybdenum are195-197Ma and177Ma. The date show that therock mass is the product of the subduction of Pacific plate in Yanshanian. On the basis ofanalyzing previous date and our work,we explore the regional geodynamic evolutionprocess in this ore district, summarize the metallogenic regularity of the typical porphyrymolybdenum deposits and the general features of the rock mass associated with porphyrymolybdenum deposits in the area. The rock mass belongs to calc-alkalic plutonic intrusive rocks, pertains to I-typegranite which has higher partition and oxidation degree. The petrological and geochemicalcharacteristics of the rock mass suggest that their structural environment is volcanic arc orcollision, means that they formed in convergent continental margin that related to thesubduction of circle Pacific. The ages of diagenesis are197-160Ma, primary rocksassemblage are granodiorite and monzonitic granite. The porphyry molybdenum dipositsare non-preference with host rocks, the host rocks can be granodiorite, monzonitic granite,the phase transition exists in them.Molybdenum mineralization is made up of quartz vein bearing molybdenum(fineextensional fracture, the granite is not altered)and thin layer of mineralization(granite hadunderwent alteration into sericitolite).The main direction of prospecting Porphyrymolybdenum deposit is fine stockwork type that related with intrusion of calc-alkalicseries.In conclusion, the rock masses in spatial terms belong to YichunFe-Pb-Zn-Mo-W-Sn-Cu-Ag ore-forming subzone, northern section of Lesser Xing’anRange-Zhangguangcai Range Fe-Pb-Zn-Cu-Mo-Au-W-Sn Crystal pyrite metallogenic beltin Jilin-Heilongjiang metallogenic province, magmatism and mineralization were underthe control of early yanshanian magmatism, the metallogenic epoch is early yanshanianmineralization and can classify into Mo-Fe-Pb-Zn-W-Cu deposit serious concerned withintermediate and acid magma intrusion activities in early Yanshanian. Porphyrymolybdenum deposit is of great potential considering in the researched region, especiallyin east-central Heilongjiang province, The main direction of prospecting Porphyrymolybdenum deposit is fine stockwork type that related with intrusion of calc-alkalineseries.