| With the increasing demanding of the mineral prospecting, it is important not only to learn the known metallogenic model again, but also to make more use of new theories and new technique and new method. Therefore, to build an economic, valid and quick comprehensive data-based targeting prospecting system for mineral resources, is essential to evaluate scientifically the area of mineral prospecting, prospecting target, and provide the direct basis for arranging the next survey work. As working terrace, the MapGis software was used to set up the geologic pacial Database and extract various metallogenic information based on the synthetically studying metallogenic geology background, the character of typical deposit, the characteristics of geochemistry and the remote sensing on geology about characteristic of Antimony-gold mineral field in Puqing. By integrating determine the nature that experts score and calculate the quantity to establish the metallogenic model and the mathematic model between the metallogenic condition, the information of mineralization and already known deposit. Developing comprehensive information metallogenic predicting study base on applying various "3S"technical methods to evaluate forming mineral, in order to provide reliable evidence for geological exploration and prospecting in Antimony-gold mineral field of Puqing.The achievements and cognition obtained were list as follows:1 .Abundant collecting the geologic characteristics, physical and chemical data, remote sensing data of the Puqing antimony-gold exploration areas by systemic field surveying and lots of data analysising, and the geologic concept model, metallogenic pattern of the Puqing exploration areas was established.1) Dachang antimony—gold deposit formed in early Permian epoch, along with earth bursting coursed by the Emei mountain movement. With the raising of the Dachang area, the sea water of the southwestern Guizhou province fall back from westnorth toward eastsouth, thus Dachang area once formed "the sinking basin" type environment. Meanwhile, the distribution range of the relative mineral resources were controlled by this mechanism The surfacial sedimentary rocks and the volcano rocks under the action of the effective physical and chemical conditions, and the heat driving about deep structure, the metallogenic material activated and concentrated in large-scale structure belts and small fracture between Huayujing structure and Qingshan town structure located in the eastnorth area of the Dachang mineral field.2) By synthetically studying on the the trace element, the rare earth element, the isotope, the fluid inclusion, it is showed that the Dachang stratum is the mineral source stratum and the main habitating stratum of the antimony and gold; The main metallogenic happen under middle and lower temperature condition(95℃～220℃), hot halogen water in the basin participated ore forming; Antimony mineral formed with the close relativity with the mineralization of As, Hg, Au and so on.3) The deposit is a type of the antimony and gold deposit formed by volcano deposition and structure reformation, and the ore body mainly exists in the clay rocks with the alteration of silicified and brecciated.4) The primary halo and soil secondary halo in channel of exploring field having been surveyed, a servies of correspond abnormal metallogenic areas were obtained.2Mainly combining "3S" technique with exploring mineral closely, and carrying on the identifying of the metallogenic information, the comprehensive metallogenic information of the antimony-gold mineral field in Puqing area was extracted.1). Through analyzing the ETM remote sensing image data of the research area with the field checking, the metallogenic abnormal area of the linear structure architecture and the orbicular structure framework was identified.2).The making grid, the abnormal mineral area delineating, and all kind of charts were formed automaticly by means of MAPGIS6.7 software, SUFFER8.0 software and MORPAS2.0 software. The data of chemic exploration had been dealt mainly with the STATISTICS software; and the remote sensing data had been dealt mainly with ERDAS9.1 software.3).A suit of AHP—Fuzzy evaluation system for the metallogenic model and the mineral source evaluation was established for the Dachang mineral field with the features of lower studying. In order to test each other and increase its reliability of the mineral prospecting, the reformed information content method was applied also. The abundant account in the process of evaluation is completed by procedure and realized the aim of convenience and quickness.4).Using the powerful spacial searching function of GIS and abstract metallogenic information controlling mineral factor and sign searching for the ore-forming prospecting. Applying buffer analyzing, the influencing extension of all direction structure, the point of structure intersection, and the mineralized area were analyzed. Finally, applying its folding function and according the power of metallogenic factors formed a series of comprehensive metallogenic predicting chart. Thus all kind of grades metallogenic predicting targets were provided for.3. At last, through using Integrating AHP-Fuzzy evaluation method and information content method, the minerals prospecting had been predicted and evaluated. And the metallogenic areas, including four first order metallogenic predicting fields, and five secondary metallogenic predicting fields, and six three level metallogenic predicting fields were delineated. Some important predicted metallogenic fields had been tested by applying the geophysical prospecting and exploration engineering, and integrating the actual geology circumstance and the information had been exposed by the finished exploration engineering to delineated the predicting ore body.4. The comprehensive information metallogenic predicting model established by applying various GIS metallogenic predicting methods can highly raise the reliability and the validity of ore-forming prospecting. The evaluated method is not only fit for the new mineral fields with lower studying on the metallogenic prediction, but also applicable for the old mineral fields with higher studying on the metallogenic prediction. |
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