The Rearch Of Au-Ag-Te Minerals About Its Compositions And Cell Parameters Relationship Of Sandaowanzi Gold Deposit

Sandaowanzi gold deposit in Heilongjiang province is a typical gold telluride deposit,and more than 90% gold is hosted in gold-silver telluride minerals.The crystal chemical properties of tellurium are the most important problems in this field.Various telluride minerals have been founded in this deposit,which is of great significance to the study of telluride mineral crystals,and to provide a very good opportunity for the study of tellurium deposits and the study of mineralogical contents of telluride minerals themselves.In this paper,the symbiotic relationship and occurrence of telluride minerals are analyzed by optical microscopy and scanning electron microscopy(EDS).based on this,picking single minerasl of telluride minerals to test the cell parameters and composition by X-ray diffraction and electronic probes.The main task is to research the influence of minerals cell parameters caused by composition.The average cell parameters of hessite are obtained through the X-ray powder diffraction analysis,the values are a0=0.8086 nm,b0=0.4476 nm,co=0.8968 nm,a=90.00°,?=123.21°,?=90.00°,It is monoclinic;the average cell parameters of petzite is a0= 1.0405 nm,It is cubic.These parameters show that the hessite and petzite were crystallized in a low temperature condition.Combining the composition and cell parameters of telluride minerals,getting a conclusion is that the change of Te and Ag in hessite has a relatively large effect on the cell parameters,but the change of Au have a small effect on cell parameters of hessite.The specific characteristics have been summarized as fallows:the positive correlation between a0 and the content of Ag,the positive correlation between b0 and the content of Ag,the positive correlation between c0 and the content of Ag,the positive correlation between a0 and the content of Te,b0?c0 and the content of Te weakly negative correlation;a0 and the content of Au was weak correlation,c0 and the content of Au was very weak negative correlation,b0 and the content of Au was very weak negative correlation.The effect of Ag and Te on the cell volume is obvious,and the effect of Au content on the cell volume is very small.The results show that the content of Ag in hessite is weakly correlated with the unit cell volume,and the correlation between the content of Te and the unit cell volume is negatively correlated.The content of Au has a very weak positive correlation with the cell volume.