The Quick Recognizing And Comprehensive Appraisal Of Geochemical Exploration Anomalies In AErCiTuoShan Area, QingHai Provience

Geochemical exploration is one of important and effect-remarkable geologic prospecting methods. How to scientifically extract, quick select and appraise geochemical exploration anomaly, and further determinate exploration target, is key to the prospecting effectiveness and economic benefit of the work, as well as important topic which geochemical exploration field has unremittingly studied in long term. Along with the modern computer information technique develops at very fast speed, GIS, as a spatial-information-processing technology, is being widely used in comprehensively processing and analyzing geodata. It will be significant tool applied to comprehensively processing multi-information and ore-finding prediction.Based on GIS technique, the author of the paper selected AErCiTuoShan area in the QingHai province of China as the research area, mostly applied the 1:50 000 stream sediments survey data, the existing geological survey and remote sensing data, to study the application to the quick recognizing and comprehensive appraisal methods of geochemical exploration anomaly. In the paper, firstly, on the basics of the comprehensive summing-up and analysis of regional geology of mineral deposit, metallogenetic pattern, geochemical background and geochemistry of landscape, the ore-forming geological conceptual model of main mineral was established, and theresearch area was divided into 4 geochemical subareas. On such a basis, geochemistry data processing methods, such as multiple-fractal method, cluster analysis, principal factor analysis, Kriging were successfully applied to study the spatial distribution characteristics of geochemical (anomaly) fields in 4 geochemical subareas and their elements assemblage. Hereby, geochemical exploration anomalies were scientifically separated from their background values, and were reasonably represented.Under the direction of modern metallogenic prediction theories, the paper aimed to prospect for Cu, Pb, Zn, etc. Based upon studying and applying the integration technology and spatial analysis methods of multi-geo-data under GIS platform, the ore-forming favorableness of the direct and indirect ore prospecting information was scientifically analyzed, and the variables, suited for comprehensively appraising geochemical exploration anomalies and ore-finding prediction, were reasonably determined. On such a basis, the paper established the quantitative model for comprehensive appraisal of geochemical exploration anomalies in research area, which can be used for quick and effectively sorting, selecting and preliminarily evaluating geochemical exploration anomalies. By studying the conversion from geology to mathematics model, the "characteristic analysis method" applied model, connected to MAPGIS platform, was applied to establish the ore-finding prediction model of comprehensive information, and different grade of exploration target were delineated.The achievements were listed as fellows outline:(1) The ore-forming geological conceptual model of main mineral in studied area was established. The regional geochemical background and geochemistry of landscape was preliminarily ascertained, and the research area was divided into 4 geochemical subareas. These researches laid the stabile foundation for the anomaly extraction and appraisal.(2) Grid covering method was applied to achieve the "concentration-area (C-A)" multi-fractal method, which was successfully used to study the spatial distribution and texture characteristics of geochemical (anomaly) fields in 4 geochemical subareas. Hereby, geochemical exploration anomalies were scientifically separated from their background values. The multi-fractal method was proved to good by testing and comparing.(3) The Traditional mathematics geology, such as cluster analysis, principal factor analysis, was effectively applied to study elements assemblage, and the principal factor score anomalies were used by characterizing association anomalies of main metallogenetic elements. According to the comparison and analysis of the existing...