| Erlang Cu deposit,Midu,Yunnan is a mainly Cu,Ag associated polymetallic deposit,Which is located in the Western Yunnan plate and the Yangtze plate junction,Easternedge Of Lanping-Simao depression.This deposit is a small copper deposit of Lanping-Simao depression,is a structural-hydrothermal alteration type.Lanping-Simao depression with a complicate tectonic settings,and result in abundant mineral resources.becomes the best known copper-metallogenic belt.Today,Occurred a number of projects large and medium-sized copper deposit.The copper deposits occurring in Lanping-Simao depression being occurreding in the Mesozonic and Cesozonic clastic rock formation composed of sandstone,siltite,glutenite and mudstone.The copper deposits were strictly controlled by tectonic structures.A number of projects large and medium-sized Cu deposit discovered in the Western margin and the Middle axial belt of Lanping-Simao depression,Only some small copper deposit in the Eastern margin.So,many scholar at home always focusd on the western margin and the middle axial belt,the research on the eastern margin belt is relatively few.This situation contributes to the mineral Exploration and Development have not been given enough attention and lower degree of research on the Eastern margin belt.Therefore,it is of great economic and social significance to carry out the prospecting research of copper deposits in this area.This paper is based on the exploration project of Erlang Cu deposit in Midu County,which is invested by the 209 geological team of Yunnan nuclear industry and Midu ErLang Mining Co.,Ltd.In this paper,the survey data and results of the copper polymetallic ore in the Lanping-Simao depression are fully collected and verified,and this is the main support,and the Erlang Cu deposit in Midu county is the research object.On the basis of comprehensively summarizing the.data of the existing research achievements and combining with the data and results obtained from this survey,the metallogenic regularity of Erlang Cu deposit in Midu county is studied,the metallogenic model and metallogenic regularity of Erlang Cu deposit in Midu county are preliminarily determined,and the corresponding ore prospecting model is put forward,which is the general exploration and development of the copper mine in the study area.It provides a certain way of thinking,and also provides certain reserve resources for enterprises.Based on the field geological work and engineering construction carried out in Erlang Cu deposit in Midu county,combined with the analysis and test results of indoor samples and previous research results,it is concluded that:?Erlang Cu deposit in Midu county is strictly controlled by Lithology and Structure,and the ore-bearing strata is the upper Cretaceous nanxin formation under paragraph(K2n1),and the copper deposits occur in the NNW F1 structural belt of this formation;NNW structural belt as the main ore conducting and ore bearing structure,The upper Cretaceous nanxin formation under paragraph(K2n1)is an important ore bearing stratum;?The copper deposits are layered and lenslike,and the ores are mainly azurite and malachite;?The mineralization strength is obviously influenced by the characteristics of ore bearing hydrothermal fluid,and the mineralization is siliceous cemented densification and silicification,carbonation and brown iron mineralization are strong sandstone and glutenite;?The contents of Si,A1 and Ca in ore and wall rock are generally high,Cu is positively correlated with Al,Fe,Ca and Ag,and has the strongest correlation with Ag,negative correlation with Si,no correlation with Mg and Au;?The REE distribution curves of ore and wall rock are very similar,with right deviation characteristics,description of the same LREE enrichment type;The mean content of ?REE is between the surrounding rock of the top and bottom,The small change in LREE/HREE reflects the higher degree of differentiation of light and heavy rare earths;?Eu shows a weak negative anomaly,and Ce has no obvious abnormality,indicating that the sedimentary rocks of the deposit are formed in marine sedimentary to continental sedimentary transition environment.The source of ore-forming material is not only related to the parent rocks in the source area(Sedimentary rocks in the Eastern margin of Lanping-Simao depression),but also by the addition of foreign fluid components(Volcanics in the Eastern margin of Lanping-Simao depression);?The Cu deposits and their existing NNW F1 structural belt are affected by varying degrees of secondary E-W left strike-slip faults and other faults in late mineralization stage.The main effects are:E-W left strike-slip faults and other faults shifted or misplaced the copper ore in the NNW F1 structural belt and its belt,and destroy the Cu deposit.Through the analysis and study of the ore controlling factors such as Eegional tectonic evolution characteristics,Eegional metallogenic characteristics,Petrological characteristics and Elemental geochemical characteristics,summarized the Petallogenic pattern and Regularity of the study area,The Corresponding prospecting model is put forward,and the Prospecting potential in this area is predicted. |
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