关键词: 鞍山式铁矿, MRAS, 预测单元圈定, 资源量定量分析

Abstract: The regional geological features，aeromagnetic and gravity field features in Anshan-Benxi area are introduced briefly.The regional prediction model of the Anshan-type iron deposits is established according to the prediction results：Iron ores deposit is located in Archean greenstone Basin of Anshan-Benxi area，and the metallogenic epoch is in Neo-archean.The ores occur in metamorphic rock of Yingtaoyuan formation and Cigou formation.Minerals are mainly magnetite and hematite.With the characteristics of ferromagnetism of magnetite，magnetic anomalies can be as an important prospecting sign.The predicting units for Anshan-type iron ores in Anshan-Benxi Area are delineated by adopting the comprehensive information method based on the mineral resource assessment system (MRAS).According to the predicting model，10 predictive variables are structured，among which six ones are retained by screening，including magnetite quartzite existence symbol and its area，magnetic anomaly existence symbol and its area，ore formation existence symbol and iron ore deposits existence symbol.The metallogenic favorability degree of each prediction unit is classified，so as to realize the optimal selection of prediction units.So，11 A-level predicting areas，9 B-level predicting areas and 24 C-level predicating areas are delineated eventually.The iron ore resources of Anshan type is quantitatively analyzed by using the geological economic method (non-total evaluating)，and the about 4.76×1010 t of resources is predicted.

Key words: Anshan-type iron deposits, MRAS, Predicting units delineation, Quantitative analysis of resources