Metallogenetic Model And Prospectings Of The Pb-Zn-Ag Deposit In The De'rbugan Metallogenic Belt,Inner Mongolia

Consist of several middle-large scale Pb-Zn-Ag deposit such as the De'rbuer,the Jiawula,the Chaganbulagen,the Erdaohezi and the Biliyagu deposit,the De'rbuer metallogenic belt located in the Manzhouli and E'rguna area,northeastern of Inner Mongolia.The E'rguna massif in which the De'rbugan metallogenic belt distributed experienced complicated tectonics such as the Paleo-Asian ocean orogeny,the Mongol-Okhotsk ocean orogeny and the Paleo-Pacific ocean orogeny.The Mongol-Okhotsk orogenic belt had significant meanings to the Mesozoic Pb-Zn-Ag mineralization in the metallogenic belt.Achievments below was based on our detail feildwork on typical deposit geological features,testings on geochemistry characteristics,geochronology,metallogenic models,and delineation on the Pb-Zn-Ag metallogenic prospectings.The typical deposit,De'rbuer Pb-Zn-Ag deposit distributed as veins and stratiform-like in the Talugangou formation andesite,in which sphlerite,galena and electrum were the main ore-bearing minerals.The ore-bearing fluid shows lowintermediate teperature and low salnities NaCl-H₂O-CO₂±CH₄ features,and mainly mixture of evolutionary meteoric and magma water due to the D-O isotopic tests on metallogenic quartz.Ore-forming materials might derive from crust by the sulfides S and Pb isotopic features.The De'rbuer Pb-Zn-Ag deposit shares lots of resemblance with the Jiawula and Chaganbulagen deposit,for instance,geological features,ore minerals assemblage,ore-bearing fluid and ore-forming minerals.These features revealed the Pb-Zn-Ag mineralization in the metallogenic belt were the same type,all showed typical epithermal Pb-Zn-Ag deposit characteristics.The Pb-Zn-Ag deposit porspecting model is established by summary of the prospecting and exporation work in the region.NW compress-crushed zone which connected with the NE fault zone is favorate tectonic space.Yanshanian intrusions such as quartz porphyry and feldspar porphyry had relations with Pb-Zn-Ag mineralization.Pb?Zn?Ag?Cu?Mo?As composite anomaies are directly instructions of the mineralization.Induced polarization anomaly and circle magnetic anomaly are also indication of deposits.Several Pb-Zn-Ag metallogenic prospecting areas are delineated,the Mo'rdaoga prospecting area,the Xiahulin-Xijinuo,the Wuma-badaoka in the E'rguna region,the Hulunhuxi,Kelulun-Shandengnao prospecting area in the Manzhouli-Kelulun region.Further mineral resources prospecting work were taken and got some achievments in the Mo'rdaoga Pb-Zn-Ag-Au prospecting area of the E'rguna region.