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Study On The Characteristics Of Structural Deformation And Ore-controlling Structure In Hadamengou Gold Mining Area,Inner Mongolia

Posted on:2015-04-16Degree:DoctorType:Dissertation
Country:ChinaCandidate:D W LiuFull Text:PDF
GTID:1310330518491421Subject:Structural geology
Abstract/Summary:PDF Full Text Request
Hadamengou golden field is located in the west of Baotou,its tectonic location is in the North China Craton region(I)Langshan-Yinshan landmass(II)Sertengshan-Taipusiqi magmatic arc(III).Hadamengou golden field is the biggest one in the northern margin of the North China Craton region.There has been founded more than 30 gold deposits in the study area.Recently,the research shows that Hadamengou golden field could have been though three periods of mineralization.They are late Archean-early Proterozoic,early Proterozoic-Mesoproterozoic,Indo-Yanshan period.The genetic type of the Hademengou golden field is metamorphism-deformation-magma high temperature liquid filling metasomatic.Regional geology characteristics of the north China craton are obvious,especially the important geological events of 2.5 billion years ago on the global ancient plate research are great significance.Research shows that there are four phases of tectonic deformation in the Wulashan Group,foliation can be classified in two phases,fold can be divided into three phases,metamorphism can be classified in four phases at least.The major mineral lineation are A-type lineation.Microstructure of the rocks show that the Wulashan Group first phase of deformation occurred under granulite facies metamorphic temperature and pressure conditions after the fastigium of granulite facies metamorphism.The percussion figure of biotite in the Wulashan Group is most likely to occur between late Archean and early Proterozoic,after the granulite facies metamorphism and before the epidote amphibolite facies metamorphism.It formed at the same time with the formation of ductile shear zone,and its presence may prove Archean crustal granulite belt is a product of plate tectonics.Mineral-reaction relationship shows that there are two phases in the evolution of the Wulashan Group,which are granulite facies metamorphism and epidote amphibolite facies retrograde metamorphism.The epidote amphibolite facies retrograde metamorphism could be caursed by the second rising temperature action.The ductile shear zone is a tectonic stress caused high-tempreture structural rock bel,formed during the metamorphism processes.It has obviously Plastic deformation characteristic,and its material formation is quite different from the surrounding rock.For instant,the content of SiO2 is rising,and the content of TiO2,P2O5,CaO,Fe2O3,MnO are rising too.The Vein is inside the brittle fracture belt which grows on the ductile shear belt.From this,we could pesume that the ductile shear belt is not only the Hydrothermal channels,but also provided the ore space.The high-temperature and low temperature toughness-ductile brittle shear deformation belt controlled the gold mineralized position and occurrence of the ore bodies.Based on the measured structural geological section and geophysical data,it shows that the major veins in Hadamengou golden mine area are equidistance from south to north.Speculated that the tectonic type of Wulashanl may like thrust tectonic style,and the ore-hosting structure is closely related to the activities of the Hubao Fault and Linji Fault.
Keywords/Search Tags:Structral Deformation, Ductile Shear Zone, Structure and Mineralization, Hadamengou, Inner Mongulia
PDF Full Text Request
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