Yunnan The Qiaojia Pine Beam Pb-zn Deposit Geological Features And Tectonic Geochemical Anomaly Model,

The Songliang Zn-Pb deposit occurs in Dengying Formation(Sinian)which is located in the Sichuan-Yunnan-Guizhou lead-zinc mineralization district,and is under control of fault strictly.Based on a study of the geological characteristics of Songliang lead-zinc deposit,this article has primarily researched the geochemical characteristics and primary halo of tectonite and so on.The cluster analyses of trace elements in dolomite and tectonite show that the associations of elements are in concordant with the geological significance that it represents.The ore-forming fluid which is rich in Zn,Cd,Ga,Cu and poor in Pb,Ge, In,lays a foundation of the ore-forming and the enrichment of dispersed elements with the dolomite.The source of ore-forming material of tectonite is the same,resulting from that the REE chondrite normatization model is the same and with a small range of their parameters.But the REE chondrite normalization model of dolomite is completely different from that of tectonite,which indicates that the material of ore-forming does not completely originate from dolomite.The result of factor analysis of R type about tectonite in F5 Fault also shows that the material of ore-forming such as Zn and Pb is partly from hydrothermal fluid.The analysis of geochemical characteristics of tectonite shows that:The direction of ore-forming fluid is from south to north,and it may experience superimposition of multiple ore-forming stages;The baritezation is closely linked with the Pb-Zn mineralization and that is the main indicators of prospecting.The axial zonal elemental sequence:Li-P-Cu-Ba-Cd-Ga-Zn-V-Ag-Mn-Ge-In~2â†'U-Sn-Th-Be-∑REE-Pb-Biâ†'Cs-In-Ta-Tl-Ti-Co-Nb-Mo-W-Li~2-V~2â†'Zr-Ni-Sr-Rb-Hf-Cr-Cs~2-∑REE~2,primary halo in the Songliang lead and zinc deposit is concluded,which indicates that the structure of primary halo is complex,the No.1 body may be superposed by many intermittent orebody,and the ore-forming process may experience more than one Stage of mineralization.The analyses also forecast that the No.1 body may has a good extend and there may exist concealed orebody in the deep of No.1 body.