Ore Genesis And Finding Prediction Of The Akeshayi Iron Polymetallic Ore Deposit,West Kunlun

West Kunlun is located in the northwest margin of the Qinghai Tibet plateau and southwestern margin of Tarim Basin,which is the binding site of the paleo-Asian tectonic domain and Tethys tectonic domain.The Akeshayi iron polymetallic deposit is located in the west of Hongliu beach in Xinjiang Province,which is the intersection of the Paleozoic composite trench arc belt and the Mesozoic continental margin of the Kunlun southern Qinling Mountains.The geological tectonic in the area is complex,the metamorphic rocks are widely distributed,the magmatic activity is frequently,and the prospecting potential is huge.This paper is based on the summary of the geological characteristics,mineralogy,petrology,geochemistry and stable isotope geochemistry research,through the study of original rocks in metamorphic rock history of evolution,metamorphic rocks of metamorphic rock protolith and evolution history of the recovery,in combination with the geochemical characteristics of the deposit,then analyze the ore genesis.The Akeshayi iron polymetallic deposit is hosted in metamorphic clastic sedimentary rocks of Kangxiwa group,the protolith is shale-sandstone formation,consisting mainly of biotite-quartz schist and mica-quartz schist,but also within the mining area of the ore bearing strata.Iron and zinc ore bodies are mainly layered like layer and lens.Ore minerals are mainly hematite,magnetite,galena,sphalerite,a small amount of limonite,goethite and pyrite;gangue minerals are mainly quartz,calcite,muscovite,chlorite.Ore structure mainly comprises euhedral-semi euhedral crystal structure and ore structure mainly disseminated structure and block structure;epigenetic lead silver and copper ore body is output in vein or lenticular.Ore minerals are mainly galena and chalcopyrite,a small amount of goethite and pyrite,vein minerals are mainly quartz,calcite,biotite,chlorite.The metamorphic rocks of mining area are distributed widely,including mica-quartz schist,biotite-quartz schist,mica-quartz schist,schist,biotite-plagioclase gneiss and hornfelsed.After a comprehensive analysis of the geological survey,petrography and geochemistry of metamorphic rocks in this area,the protolith has been restored.Among them,the protolith of muscovite-quartz schist is granite,the protolith of biotite-quartz schist is argillaceous rocks,the protolith of mica-quartz schist and hornfelsed is graywacke,the protolith of biotite-plagioclase schist is acidic intrusive rocks and the protolith of green schist is basalts.The source component of wall-rock in this deposits are mainly the felsic rocks,which also contains igneous provenance and ancient sediment recycling.The tectonic environment of original rock ore schist may be formed with subduction of continental arc or back arc basin on.The sulfur and lead isotope studies indicate that the lead isotopic model ages is much later than the host rock age,so it is a epigenetic lead silver deposit.Sulfur and lead isotope indicate that epigenetic lead silver deposit has the characteristics of hydrothermal ore deposits.Compared with the typical SEDEX type deposit,the Akeshayi iron polymetallic deposit has two mineralization stages,the early submarine exhalative sedimentary metamorphism of metamorphic sedimentary Fe,Pb,Zn deposit,exhalative sedimentation is the main mineralization stage,late superimposed hydrothermal silver lead mine.In the comprehensive analysis of geological and geochemical information on the basis of a Keshayitieduo metal deposit prospecting area ii.In the Second District,two geochemical anomalies of the north and South are found,the abnormal strength is high,and the prospecting potential is huge.