Ore Deposit Geological Characteristics And Prospecting Direction Of Dongsheng Ultra-poor Magnetite Ore Deposit In Mulan County,Heilongjiang Province

Dongsheng ultra-poor magnetite ore deposit is the new discovered deposit in Mulan county in recent years.As of April 30,2014,Dongsheng ultra lean magnetite ore deposit cumulative ascertain reserves of iron ore resources about 35 million tons,and the average grade of mFe is 8.81%.Proven intrinsic economic resources?331?is 24 million tons and the average grade of mFe is 8.61%;Control of intrinsic economic res-ources?332?is1.4364 million tons and the average grade of mFe is 8.83%;Inference of intrinsic economic resources?333?is 9.9267 million tons and the average grade of mFe is 8.89%.With the rapid development of national economy,the demand of iron ore are also growing.Although the iron ore price vo latility is larger in recent years,iron ore prices are still generally run on high.So there are important significance about development of Dongsheng iron ore in Mulan county for local economic growth.Although the grade of Dongsheng deposit is low,it is easy to choose and the scale is large,still regard it as a kind of mineral to development.Due to the low research degree of the deposit and weak theoretical research,deposit geological characteristics is not clear and the prospecting direction of fuzzy factors restricted the ore-prospecting work in progress.So the deposit need a comprehensive study.This article provide theoretical guidance for next step prospecting work by the study of geological characteristics,and determine the research direction of prospecting in the area.Mining area tectonic position is in Tianshan-geosynclinal area,southern black fold system Mulan-yichun fold belt.Evolutionary stages of the mine area is geosyncline stage of development,and tectonic movement is strong.Mainly include north east,north and south and north west tectonic belt.The outcropped formation in the mining area:the ordovician xiaojingou group?O₂x?,jianxing group?K₁jn?,lower quaternary overbank accumulation?Q₄²?.Strata outcropped in the mining area is basically monoclinal structure,strata are leaning to the south west,north west direction,dip Angle is 40°-50°,the local affected by intrusion into change steep dip Angle in more than 70°.The fracture in the mining area basically divided into two groups:one group is 30°to 35°towards the north east.Another is to the north west of 320°-320°.In the hornblende rock mass and metamorphic rock near the contact zone are all in development and become channels of dike and ore fluid activities.Ore body is mainly produced in hornblende rock mass,the ore body is layered,occurrence nearly level.Metal minerals are magnetite,titanium magnetite;Nonmetal minerals are mainly hornblende,tremolite and altered pyroxene.Ore structure is granular structure and sideronitic structure.Surrounding rock occur chloritization,epidotization,etc.The genesis of deposit is basic magma differentiation iron deposit.The aeromagnetic feature of Dongsheng deposit performance was low and oval-shaped magnetic anomaly zone,medium-sized,the abnormal central intensity was in600-1000nt.Further,use the 1:10000 precision magnetic measurements,found that high-precision magnetic survey results can effectively distinguish magmatic rocks and strata,as well as revealing the regional tectonic,by analyzing the relevance of the regional metallogenic geological conditions with the magnetic field,we can effectively use high-precision magnetic anomalies indicate magnetite body.This article is circled with 11magnetic anomalies,and combine with the geological research curtained 6 emphasis prospecting target.And the positive magnetic anomaly raised is the nineralization favorable position.This paper determines the prospecting marks of the deposit such as structure,magmatic rocks by summarize geological,geophysical and geochemical information Then regard the corresponding high magnetic anomaly zone and chloritization,epidotization mineralized alteration as the next step prospecting direction.