Metallogenic stages and chronology of the Xijiazhuang gold-lead-zinc polymetallic deposit in Mengcheng,Anhui Province
The Xijiazhuang gold-lead-zinc polymetallic deposit is a newly discovered polymetallic deposit in the western section of the Bengbu uplift.The prospecting on it has achieved a breakthrough in the deep covered areas of the northwest Anhui.The study of the metallogenic stages and chronology of ore-forming rock mass of the Xijiazhuang deposit is of great significance for understanding the genesis,prospecting direction,and regional metallogenic regularity of this deposit.Through detailed field geological observation and microscopic identifica-tion,this paper divided the mineralization of gold-lead-zinc polymetallic deposits into three mineralization peri-ods(skarn period,hydrothermal period,and supergene period)and six mineralization sub-stages(early anhydrous simple skarn stage,late water-bearing complex skarn stage,quartz sulfide stage,early carbonate stage,late car-bonate stage,and supergene stage)according to their genesis epoch,intergeneration and the relation between host-rock alteration and mineralization,among which the quartz sulfide stage and early carbonate stage are the main.Utilizing the zircon LA-ICP-MS U-Pb dating,the ages of the major ore-forming rocks such as granodiorite por-phyry and quartz monzonite porphyry in the mining area are determined to be(114.77±0.48)Ma and(113.70±0.51)Ma respectively,which indicate that it is the product of the early Cretaceous magmatism.
Xijiazhuang Au-Pb-Zn depositepisodes of mineralizationzircon U-Pb datingBengbu upliftMengcheng,Anhui Province
万方数据
维普
