The Yunnan Malipo Emerald Deposit Mineralization Geological Background And Metallogenic Model Of Research

Emerald is a kind of green beryllium aluminum silicate mineral with minim Cr or V elements in it's chemical formula.Because of it's rare,emerald is one of the most precious gemstone in the world.In general,researches classified three kinds of emerald deposites:hydrothermal pneumato-hydrothermal and pegmatites deposit.Malipo emerald deposit in Yunnan is the first emerald deposit found in our country and have done some more detail researches.But until now, the research about it's formation is skin-deep,ore-forming geological background of this deposit have never done,also haven't anybody discussing about its prospecting perspective.So do comprehensive research about it's ore-forming geological background and establish the actual metallogenetic model have the vital significance without doubt.Metamorphic core complex with its effects in ore control is a popular task in modern geologic world.Formed in the continent extensional regime,core complex with its peel fault structure have important significance in metalloqenic rule control,also is the important area for rare-metal minerals enrichment and mineralization.Through the oriqin and metalloqenic research of Malipo emerald deposit in Nanwenhe metamorphic core complex,I hope this paper can offer some usrful ideas for the up task.Research from the deposit's geologic characteristics,according to the systematic researches on the field survey,rock geochemistry analys,trace elements analys and rock sheets observation combined with the newest data from former researchers,especially the research on regional geotectonic setting,and apply the theoretics of metallogenic,petrology,geognosy and mineral deposite geology,the author research the emerald deposit as a dynamic progress,put the ore-forming progress in the forming-uplift-evolution progress of Nanwenhe metamorphic core complex.Bring forward four evolution phases of the emerald deposit and its metalloqenic model first time.Besides,in this thesis,the author use the theory of regional tectonics-fluids-metallogeny, proceed with three aspects:stratum and lithology controlling factor,process of ore-forming fluids and metamorphic core complex with its significances in ore control,expatiate the cause of emerald formation and established the genetic model,give the conclusion that Malipo emerald deposit is formed form the pegmatites of late Yanshannian remainder magmatic hydrothermal fluids and it's after pegmatites pneumato-hydrothermal phases.Emerald mineralization controled both by tectonics and fluids.