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Application Of The Weights Of Evidence Model Basied On Gis To Prediction Of Iron Ore Deposits In Liaoning Province

Posted on:2008-12-22Degree:MasterType:Thesis
Country:ChinaCandidate:L ZhaoFull Text:PDF
GTID:2190360308478645Subject:Mineral prospecting and exploration
Abstract/Summary:PDF Full Text Request
Liaoning province is located in the east section of northern fringe of North China field platform, strides over two first grade geotectonics element and takes that Chi Feng-Kai Yuan breaks as boundary, the south is North China field platform area on the side, the north is Neimeng-Naxinganling wrinkle system and Jihei wrinkle system. Iron mine is the main resource in the area and iron resource reserves take the first place in China. The type of iron mine is mainly of Archean Ferrosilicon, simultaneously including other type of iron mineral deposit.Based on the research results of the iron ore deposit of predecessors in Liaoning Province, Liaoning province was divided into two parts in this thesis, that is, Anshan-benxi area and Liaoxi area. The type of iron ore deposit is main of the Anshan type in Anshan-benxi area, it occured more concentratedly and as larger scale deposit. Iron ore types are many kinds of in the Western of Liaoning, and scattered anywhere and the size of deposits was small usually. With the geological information of the earth tectonic structure, the tectonic fault, stratigraphy and magmatic rocks in the research area,combining mine geological data, the occurrence of the deposit and geological environment were fully analyzed. By analyzing the typical types of iron deposits, the mineralization conditions what are valuable for various types of iron deposit was discovered. With the geological and geophysical anomaly characteristics, the prospecting model of Liaoning Provincial iron ore was established.Evidence weight modeling is a geographical statistical method, which is brought forward by Agterberg who is Canadian geologician.It analyses and predicts the deposits based on information of superposition related to mineral resources. Put each factor as evidence, and the contribution of evidence is determined by the weights. The merits of evidence weight modeling are data-driven and easy. And there been many successful applications in prediction of mineral resources.The stratigraphy and geophysical anomalies was put as the evidence layers in this study, the Anshan Iron-prospecting forecast area was gained and with good result.As a foundation of the region prospecting pattern of Liaoning province, with MAPGIS and ACCESS software, the regional geology application database has been established, The mathematic forecast model of evidence weight modeling was used to carry on the mineralization forecast of the region iron ore in Liaoning province. The key mineralization area and prospecting area were given out. The research indicates that the mineralization forecast of iron deposit with the evidence weight modeling had good reliability, and provides the further evidence for searching iron ore deposit in Liaoning province.
Keywords/Search Tags:Weights of Evidence Mode, Mineralization forecast, Iron ore, Liaoning Province, MAPGIS
PDF Full Text Request
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