The Integrated Information Exploring Model And Prediction And Assessments Of Beiya Alkali Porphyry Gold Deposit In Heqin Yunan

Integrated information prospecting model is to summarize the mineralized indictors,exploration precondition and comprehensive information characters with the precondition of mineralization theory, ore body and then come into being a statistical exploring model.It aims to establish an integrated model suited for the research degree and geological setting to predict and assess mineral deposits by the information correlation and conversion between direct and indirect mineralization indictors on the base of constructing comprehensive information prospecting model. This thesis studied the mineralization indictors,favorable condition systemically and then established the integrated information exploring model guided by comprehensive information minerals theory through applying geophysical,geochemical and remote sensing technologies in a typical alkali porphyry gold deposit in Beiya,Heqing county of Yunnan province.A knowledge-driven based predict method on the base of integration information prospecting model was established.This paper is composed by 3 parts or 7 chapters. The first chapter is the theory basis and foundation of the research title.The realistic and academic signification applying integrated information model in this alkali porphyry gold deposit in western Yunan were stated from the view of comprehensive information model in modern exploration combined with the study status of this deposit. The signification of applying integrated information prospecting model is: 1.With the increasing of difficulty in deposit exploration,applying geological,geochemical and remote sensing data synthetically is an important and certain trend in exploring insidious and hard identified ore deposits. 2.Minerals exploration is also a economical activity which calls for better geological effect and bigger economical benefit.While the integrated information exploring model is the effective tools for minerals exploring and resource assessment which is the result of minerals theory and practice development. 3,The integrated information exploring model is a favored tool to overcome the disuniform in geological observation and multi-interpretion in geochemical and geophysical data,which is also can reflect the external visage of deposit and minerals. As to Yunan province, the new gold deposit related to high-alkali porphyry in the western regions of the Yunan Province is the extremely important gold mine type of the new discovery, its resource perspective reserves can up to several hundred ton. However, the ore finding work about this type of gold deposits is just started, the exploration is poor, and the study of its mineralization condition is still need more work, reserve is uncertain and the deposit is less. So, it is more significant no matter in theory or on practice to select the representative deposits, combine and analysis its information about geology,geophysics, geochemical and remote sensing, and then form a final deposit researching model. Second part including two, three,four,five ,six chapters, is the main research contents of the thesis, it is the centre point that the integrated information looks for the ore model and studies too. The regional mineralization background, geophysical and geochemical character of Beiya gold deposit are detail discussed in chapter tow and chapter three. The final study shows that Jinshajiang-Ailaoshan faults and Chenghai faults controlled the distribution of the porphyry cluster and deposit zone, regional faults and its conjunction area controlled the deposits distribution. The high-alkali porphyry has more consanguineous relationship with regional gold deposits both in time and spatial. Regional magma activities have a character of multi-epoch and multi-stage. Fastigium of mineralization enrichment is in the middle stage of magma activities. And the area with complex massif is more favorable place. Trace it to its cause, first, necessary hot motive force gets the supply continually, second, perhaps the offering mineral substance continually. The characteristic of regional geophysics field, geochemistry field shows that the gold mine of Beiya is in the regional aeromagnetic slow unusual range of negative value, reflects that this district is a ground body of basin. The aeromagnetic value of NE and SE is normal, The aeromagnetic unusual value of the NE gradient band existed in the SE side possible reflects the dark rupture. At the same time, the gold mine of Beiya located in the NE abnormity grads band of average gravity, and located in the south positive unusual edge where the negative abnormity cut off the positive abnormity in north and south. So, the obvious change terrain of the two kind of geophysics field, gravity field and aeromagnetic field is the signal of regional geophysics related to rich alkali and porphyry that rich gold and metalliferous deposit distribute. 1:200,000 river system sedimentary gold and relevant element content and unusual characteristic indicated that rich alkali porphyritic ore terrain often have obvious concentrated center of Au unusually, and accompanied with the unusual combination of Ag, Pb, Zn, and As at the same time. The mineralization model is the bases of Integrated information prospecting model and its credibled base on the research of mechanism of metallogeny,metallotect and ore guide.The geology feature,mechanism of metallogeny,metallotect,Integrated prospecting of geophysics and geochemistry is studied in the fourth chapter and fifth chapte.Sum up the ore-control feature by structure-magma-mineralization of Beiya gold mine.There are three typies of gold mine:the gold-ieon mine related of alkali porphyry,laterite gold deposit,drift bed gold deposit。By the study of suifur and isotope it inditade that the gold come from the upper mantle and mineralization go up from earth deepness with the hydrothermal fluid of the alkali porphyry.The alteration feature is potassic-silicium-ferrum from the rock core to contact strip.Establish the Integrated information prospecting model of Integrated information prospecting model base on the geology feature,mineralization types,mineralization source mineralization.The prospecting sign of geophysics and geochemistry: 1,middle-strong magnetic anomaly and consistent theregionality constract trend; 2,low-slow ortho and negative magnetic anomaly ang has low electric resistance; 3,high Au and Au—Pb—Ag anomaly。 Geology active,mineralization,hot-dynamica action has reflex by heating power field,geochemistry,geophysical,structure stresss and mineralization field.we can acquisition the usefulness information of string-ring structure and alteration from remote sense.. From some sense,remote sense information is the outside represent of Integrated mineralization information.Acquisition the high resolution color composite image Base on the teature of ground object spectrum and ETM1～5,7 与 ETM8 fusion. Acquisition the limestone stratum by SAM and string-ring structure base on the imagefeature. Its difficulty to detail recognize alteration with ETM image.Estabish the Ratio +selected PC+HIS emphasis extract model of alteration information .Base the model, Acquisition the alteration information in study field. The third part sets up the integrated information exploring model for alkali porphyry gold deposit in Beiya based on the second part which researches in detail on regional geological background,regeional geophysical field, geochemical characters,geophysics of the diggings,geochemistry,remote sensing anomaly information characters and deposit geological characters.The integrated information exploring model based on deposit metallogenic pattern integrates the mineralization rule knowledge with exploring favorable information on the exploring targets.In fact,the regional mineral resource prediction and evaluation based on the integrated information exploring model is a mineral resource quantitative evaluation way based on knowledge drive,which selects and evaluates the predicting variables by the knowledge gotten from the integrated information exploring model.The paper establishes a modifiable and two types evaluating way to give the variable's value.The process classifies the 12 variables into 3 classes named Ⅰ ,Ⅱand Ⅲ according to the integrated information exploring model and gives them respectively 1.0,0.5,0.2 weights.At last,using the spatial analyses function and characteristic information way,the regional mineral resource prediction and evaluation is done,then the future regions are forcasted.The results are as follows: the first class future region has one named Wayao-Beiya-Nandaping,the second class future have three named Taipingcun-Changmujing-Heinishao,Changping-Malachang and Gaomei-Dabanjing. When the region prediction is done,the four exploring target regions are forcasted using integrated information and deposit mineralzation prediction. The four exploring target regions are named respectively Wangdongshan East-west contacting zone,Hongnitang rock east contacting zone,Bijiashan west contacting zone and Tertiary and Quaternary zone in Beiya basen.