| GIS技术在成矿预测中的应用实例——以杨家杖子矿田为例 |
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| 引用本文：.2005.Application of GIS to metallogenic prognosis: Case study of Yangjiazhangzi ore field[J].Mineral Deposits,24(6):684~691 |
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| 中文摘要:文章系统地总结了利用GIS技术在辽宁省杨家杖子多金属矿田外围进行找矿预测研究的工作过程。工作中，采用多因素套合分析法圈定找矿靶区，在一个找矿靶区内找到了2个新的矿床。所谓的多因素套合分析法是一种基于GIS平台的找矿预测方法，其核心是利用GIS平台对与成矿有关的2个以上因素的空间关系进行分析，提取有用信息，快速缩小找矿靶区。实践证明，多因素套合分析法是一种基于GIS的简便易行、快速缩小靶区的找矿预测方法。 |
| 中文关键词:地质学 GIS 成矿预测；空间分析；套合异常；杨家杖子矿田 |
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| Application of GIS to metallogenic prognosis: Case study of Yangjiazhangzi ore field |
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| Abstract:This paper gives an example of metallogenic prognosis by means of GIS (Geography Information System). The authors found two nonferrous metal deposits in an exploration target. In the ore_prospecting process, a method called multifactor overlap analysis was used for metallogenic prognosis. The essence of this method lies in an analysis of the connections of two or more factors related to mineralization. There are six steps in the multifactor overlap analysis, i.e., the preparation of data, the determination of the major factor, the analysis of the connection between the major factor and the other factors, the discussion of the results of overlap analysis, the delineation of the exploration target, and the investigation and verification of the target. In this case study, data were obtained from Geological Databases of Liaoning Province.Work was conducted in the Yangjiazhangzi ore field and its peripheral areas, which covered 1600 km2. The Yangjiazhangzi ore field with an area of 260 km2 is a very important nonferrous metal ore field in Liaoning Province, in which there are nine molybdenum or lead and zinc deposits. Geochemical anomalies were regarded as the major factors. The connections of the factors with MAPGIS (GIS software) were analyzed. The overlap part of different factors was called overlap anomaly. The results of overlap analysis show that the overlap anomaly of Mo, Bi and W can indicate the position of a deposit. At the same time, Bouguer anomaly, aeromagnetic anomaly and other geological data were also analyzed in the GIS table. Finally, an exploration target was delineated. The distance from the exploration target to the ore field is 25 km. The first step in investigating and verifying the target was stream sediment survey that covered an area of 50 km2. Five geochemical anomalies were found. These anomalies were called As_1 to As_5. Then, a molybdenum deposit and a zinc deposit were found in As_1 and As_4, respectively.It is considered that, with multifactor overlap analysis, we can rapidly reduce the area of exploration target. It is also reasonable that the overlap anomaly of three to five factors might be used to determine an exploration target.A new method for metallogenic prognosis based on GIS is described in this paper. |
| keywords:geology, GIS, metallogenic prognosis, spatial analysis, overlap anomaly, Yangjiazhangzi ore field |
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