| The paper relies on the tutor “Tianfeng Company's Wulonggou gold prospecting and mining prospecting research project Phase I work” project,the use of existing tunnel system can be used to sample the Jinjingou mining area with a sample of 205 samples.The major categories can be divi ded into four categories: intrusive rock,mylonite,cataclastic rock,and a very small amount of ther mal contact metamorphic rock.At the same time,we have conducted in-depth studies on the prima ry and secondary minerals of rocks and the structural types of rocks.Samples taken in the field we re processed in-house to grind slices and light sheets,and then the polished flakes and light sheets were identified and observed to understand the mineral composition and structure of the rock.Through the identification under the microscope,the primary minerals in the study area are mainly quartz,plagioclase,K-feldspar,biotite,amphibole,pyroxene,garnet and so on.Major altered minerals are sericite,muscovite,clay minerals,chlorite,carbonates,and siliconized quartz.Among them,there are four types of single alterations: muscovite,sericite,clay minerals and carbonates;there are six types of altered mineral combinations: sericite-silicified silica,sericite-carbonate,sericite-muscovite-Carbonate,sericite-clay,clay-carbonate,muscovite-clay-carbo nate.The types of rock structures in the study area are broadly divided into three categories: crystalline structures,metamorphic structures,and deformed structures.Among them,there are a large number of slatted structures formed by ductile deformation,such as feldspar quartz swarf,quartz sub-grain,core-strontium structure,stone sausage structure,book oblique structure,mica fish,SC structure,and trailing deformation.and so on.The brittle and ductile shear deformation in the study area is strong,and the NW-brittle-ductile shear zone of the Jinjingou parallel distribution is formed.It is composed of a number of strong deformation belts and weak deformation zones between them,with the features of strong and weak deformation alternately developed.Especially brittle and brittle-ductile deformations,control the formation of gold and non-ferrous metal deposits.Gold ore bodies are mostly formed in and near the fracture zone,and a small amount of high-grade ones are also present in the non-broken zone.The metallogenic model in the study area is complex and may be multi-phase mineralization.The identification shows that the main lithology of the study area is intrusive rock,mylonite,cataclastic rock and a very small amount of thermal contact metamorphic rock.Among them,intrusive rocks include granites and gabbros;mylonites include tectonic schists,tectonic gneisses,and mylonites;cataclatic rocks are mainly granitrites;there are few thermal contact metamorphic rocks,including marble and Marble limestone and quartzite.Most of the gold bodies in the Yanjingou area occur in structural schists,gneisses,granitoid mylonites,mylonites,black-cloud plagioclase(monzonite)granites,and contact sites of mylonites and rock masses.Through the systematic analysis of petrographic studies in the study area,the tectonic environment of the study area was understood,and the effects of altered minerals,structural deformation,and rock types on the ore-forming mechanism in the region were ascertained,and to some extent,it indicates the direction of reconnaissance. |
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