| The study area is situated in Qilian Orogenic Belt, this orogenic beltexperienced a long period of tectonic evolution, development of the multi-phasemulti-stage tectonic magmatic activity, and therefore, the study area regional tectonic,magmatic rocks developmental. This master thesis research work, on the basis of thestudy area to collect all previous geological, geophysical, geochemical and otherinformation on the conduct of the lead wins1:50000regional geological survey andin-depth understanding of the study area strata, magmatic and tectonicfeatures.Carrying out regional remote sensing geological, geophysical andgeochemical geological works, find a comprehensive abnormalities, combined withtypical regional metallogenic study of geological conditions, geologicalcharacteristics of the deposit and ore-controlling factors detailed investigation andresearch, a comprehensive analysis of ore-forming geological conditions in the studyarea.Comprehensive Evaluation of the study area may form types of mineral resourcesand prospecting potential,conductingYinsheng regional metallogenic prospectdivisions.The study area is mainly exposed strata：Paleoproterozoic Huangyuan rocksgroup’s Dongchagou Formation and Liujiatai Formation,Proterozoic Huangzhongrocks group’s Moshigou Formation,Qingshipo Formation and KesuerFormation,palaeozoic Yingou rocks group.Magmatic activity and development in theregion, mainly developed Jinningian Caledonian and mainly intermediate to felsicintrusions. Magmatic activities and stratigraphic contact extensively contactmetamorphism, development of double metasomatismgeological processes.Occurrenceof multi-stage and multi-metallic mineral tectonic mineralization in the region-isclosely related to magmatic activity, for all types of deposits formed to provide a veryfavorable geological conditions.The magma activity development, mainly inCaledonian period and Jinning period acidic rock mass is given priority to, magmaticactivity has a certain influence on formation and mineralization of the metals within the closely connected to the magmatic activity many times, for all kinds of ore depositsformation provides extremely favourable geological conditions.Fracture structuredevelopment in this area, Zalonggou,Kaerzuo,Jiadaogou Fracture structuresare givenpriority to, Mainly in the northwest, southeast and east-west distribution, thses havecontrol of the strata, rock mass distribution pattern in the study area, secondary fracturestructures derived from deep major fault have more closely relationshipwith mineralization,both regional metallogenic fluid migration channels and the orematching space of ore-forming fluid crystallization precipitation mineralization.Mineral resources in the study area currently found in lead, zinc, tungsten, iron,copper and polymetallic mineral-based, iron, lead and zinc have been foundpolymetallic deposit, and22ore points, and the size is generally small (small andmedium-scale), the type and quantity of minerals in the study area is less visible.up tonow the regional geological survey and mineral research, discovery of various typesand exploration of abnormal signs are not so obvious, the depositshave been found inthe degree of geological exploration is generally low.Summarized results of previousstudies found that the main mineral in Yinsheng regional obviouslycontrolled by thestratigraphy, tectonics, magmatism.Mineral distribution in the region has the followingcharacteristics: Black metal ore mainly distributed in the northern and central strata,mines and more with the formation, fracture and acidic granite rock about; nonferrousmetals mainly in the northern part of the study area, the main mineralization producedin Kesuer Formation and the contact area of granite rocks and it,having thecharacteristics of skarn deposits.Forming deposits in the study area, mainly areGashenjiang lead-zinc deposit,Daxigou magnetite and Shangjiakepyritedeposit,therefore,this paper ontypical deposits mineralization, genetic model andore-controlling factors in this area have general researched,and choose Gashenjianglead-zinc and Daxigou magnetite deposit to research in detail.Gashenjiang lead and zinc deposit is located in Qilian uplift in the northern margin ofthe eastern zone.Mineralized bodies produced in the contact areaof the kesuerformation and granite rocks. Exposed stratigraphic distribution in east-west wasmetamorphic carbonates,slate,schist and quartzite of middle Proterozoic.Magmaticrocks are mainly Caledonian acidic intrusive granite, granodiorite.Mineralizationtakes the shape of an irregular zonal distribution, the mineralized body significantlyaffected the dual control of formation and structure, enriched in fault fracture zone,thejoints and structural interchange.The ores are mainly composed of sphalerite andgalena, block structure and disseminated. Wall rock alteration are mainly skarnization,angle of lithification,silicification, flash petrochemical.It istypical andrelated granitoidsSkarn hydrothermal lead-zinc deposits.Daxigoumagnetitedeposit is located in the south wing of syncline core in Qiliancentral uplift belt.Outcropping strata are mainly Qingshipo Group and MoshigouGroup,the relationship is conformable contact.Lithology are mainly medium-deepmetamorphic quartzite, magnetite quartzite clipped in marble, schist.The main orebody is controlled by the occurrence formations, magnetite is closely associated withquartzite, Ore minerals are mainly magnetite, mainly for the crystal structure, blockstructure, Magnetite is in fine grained crumb inlaid between quartz grains.Wall rockalteration is given priority to with angle of flash petrochemical and diopside inpetrochemical.It belongs BIF magnetite.Through the detailed study of the geological characteristics and ore-controllingfactors of Gashenjiang lead and zincdeposit and Daxigou magnetite deposit in studyarea,regional metallogenic geological conditions in Yinsheng region launched apreliminary analysis,based on systematic study of the characteristics of the regionalstratigraphy, structure, igneous rocks,types of mineral resources in the study area maybe formed were discussed.The in-depth analysis of the above two typical ore depositsbased on the main ore-controlling factors,preliminary summary and study the laws ofmineralization and mineralization geological conditions in Yinsheng region,this papercombines the study area geological survey, geophysical and geochemical andgeological remote sensing work,the potential of Yinsheng region launched apreliminary evaluation of prospecting and mineralization prospect zoning through acomprehensive analysis of multivariate information,and comprehensive prospectinganomalies delineated,therefore,three prospect proposal areas have been initiallydivided. |
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