Studty On The Mineralization And Prognosis In Western Mt.Xiong’er Silver-Lead-Zinc Deposit, Henan Provice

The dissertation briefly describes the regional geology, geophysical and geochemical background of western Xiong’er metallogenic province, summarizes the Ag-Pb-Zn polymetallic ore field geological characteristics of strata, structure, magma, geophysics and geochemistry etc. Especially expounds the rock and mineralization controlling characteristics of metamorphic core complex. After studying the Yanshanian period granite geology, petrology, rock geochemistry, trace and REE earth elements etc, making sure that the granite were formed by the partially melting of lower crust and then contaminated by upper crust. The REE partially melting mathematic quantitative model simulation showing that the Yanshanian period granite with post-orogenic type tectonic environment background comes from the30%melting of Taihua group rock. In geophysical aspect, gravity low anomalies indicates the existence of concealed rock bodies while IP anomalies accurately indicates the occurrence and mineralization scale of Ag-Pb ore bodies. In geochemical aspect, this region is in the excellent metallogenic background geochemical enrichment zone which centers on Zhaiwa rock annular high temperature element composite anomalies and revolve around by three secondary ring-shaped middle and low temperature element composite anomalies in east, north and south direction. By researching geological, mineralization, ore structure, metallogenic stage and wall rock alteration characteristics of typical deposits such as Tieluping, Haopinggou and Shagou, summarising that the Ag-Pb-Zn deposit general characteristics are larger veins, thin and shorter single ore body with higher Ag grade. The ore structure is relatively simple and the metallogenic stage can be divided into three stages. The wall rock alteration are symmetric development centers on veins with siliconization mainly. Deposite is obviously controlled by the geological structure and can be classed as low temperature, low salinity and hypabyssal deposite. The main metallogenic time is Yanshanian period with immediately after the I-type granite intrusion. The ore Pb, S, H and O isotope studying resultes all support magmatic and meteoric water mixture viewpoint. Based on system summary of the deposit exploration, building the prospecting models in this area. Through evaluation and studying the Ag resources potentiality based on MRAS system, estimation the Ag resource in this region, then proposing1A category target,2B category targets and1C category target.