| Yangshan Gold Mine is located in Gansu Wenxian territory of the super-large gold deposits,in the last century 90's,it was found by the Chinese armed police forces after more than 10 years of hard work.At present the cumulative amount of gold exploration resources nearly 400 t,renowned at home and abroad.However,in recent years,many scholars have different understanding of the genesis type of Yangshan gold deposit,some scholars believe that Yangshan gold mine is Carlin gold mine,in recent years,the rise of orogenic gold deposits,there are many geological scholars will be classified as orogenic gold mine Yangshan gold mine.Combined with my field work experience in the mine,In the system of combing predecessors for the Yangshan gold mine on the basis of research results,and on the basis of systemly combing the research results of predecessors for the Yangshan gold mine,in order to the geological phenomena observed in my field and the analysis of first hand data.Through data collection,field geology survey,core sampling,optical wafer microscope observation,geochemical data processing,and other methods and methods.I point out some shortcomings in the genetic understanding of yangshan gold deposit,and put forward my own understanding.The main achievements and knowledge are as follows:1: The orebodies are mainly found in the slender-long granite porphyry bodies,followed by the fractured eclogged phyllite and quartz-calcite veins,and the ore-bearing ratio is roughly 8: 1: 1.The results of borehole catalog show that the ore-bearing section of Anba ore section shows stable stratification characteristics from top to bottom: More fresh phyllite ? altered phyllite(shear deformation),a small amount of quartz veins ? ore-bearing plagioclase granite porphyry ? altered phyllite(shear deformation),quartz-calcite veins.2: The alteration of ore-bearing body in Anba ore deposit of Yangshan gold mine is mainly Pyrite,chlorite,etc.,the alteration of the surrounding rock is mainly chlorite,green petrochemical,sericite,kaolinization and so on.Typical medium-temperature hydrothermal alteration(sericite,lacustrine petrochemical,chloritization,silicification,carbonation)relative to phyllite,slate rock,while the deposit for the post-generation.3: It is found that the pyrite is mainly disseminated in the plagioclase granite porphyry and the quartz-calcite vein by micro-particle disseminated distribution through the drilling core and the microscopic observation.and in the fractured alteration phyllite along the structural fracture orientation distribution.But still the former two as the main body.4: The correlation and clustering analysis of the sediments of the 1: 200 000 and 1: 500,000 water systems in the study area: 1: 200,000.It is concluded that the combination of Au-As-Bi-W-Pb-Sb in the Yangshan gold deposit is a typical combination of medium and high temperature mineral elements,which is consistent with the assemblage characteristics of orogenic gold.5: Based on the analysis of the geological characteristics and regional geochemical characteristics of Yangshan gold deposit,the geological-geochemical model of Yangshan gold deposit is established,which is the further prospecting of Yangshan gold mine and the gold deposit similar to Yangshan gold deposit The prospecting work pointed out the direction.6: Through the geological characteristics of the deposit and regional geochemical characteristics of the study,Yangshan gold mine at the same time a variety of geological features.From the mineral mineral assemblage and the ore body boundary,etc.,it has the characteristics of Carlin type gold deposit,which has the characteristics of orogenic gold deposit from the tectonic setting and mineralization element combination,So can not simply Yangshan gold mine classified as "Carlin-class Carlin-type gold" or "orogenic gold mine."... |
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