新疆东昆仑西段铁矿预测区的圈定及资源量估算-基于ArcGIS平台

研究区属华北板块的柴达木地块的早古生代陆缘活动带（祁曼塔格裂陷槽），即祁漫塔格早古生代岩浆型被动陆缘。本文基于ArcGIS平台，通过建立研究区铁矿资源潜力评价模型，以沉积变质型铁矿为例，对新疆东昆仑西段的铁矿资源进行预测区的圈定，并对圈定的靶区进行优选。由于沉积变质型铁矿主要与沉积地层、岩石分布状况有关，总结出本研究区沉积变质型铁矿主要控矿因素包括沉积地层、Fe元素异常、岩石组合等。本文选取（1）沉积地层、（2）Fe元素异常这两个方面的证据图层对研究区铁矿资源进行预测，共固定了3个沉积变质型预测区，其中A类1处，C类2处。在成矿区带圈定的基础上，估计区带内未发现矿床的个数；对预测区矿点的分布、品位、矿石量（吨位）的分布特征进行模拟，来获得资源量的估算，对研究区铁矿资源潜力做出快速、准确的评价。此次研究表明新疆东昆仑西段具有一定的铁矿资源潜力。

Delineation of the Predicted Iron Ore Areas and Resource Estimation for the Western Section of the East Kunlun in Xinjiang-Based on ArcGIS Platform

The research area lies in the early Palaeozoic epicontinental active belt (Qimantage rift trough) of the Qaidam block in the north China plate,which was the early Palaeozoic magma type passive epicontinental in Qimantage. Based on the ArcGIS platform,taking the sedimentary-metamorphic type iron ores as an example,this paper constructs an evaluation model for iron resource potential,delineates the forecasted iron ore areas in the western section of the East Kunlun,and optimizes the target areas. As the sedimentary-metamorphic type iron ores are related with sedimentary formation and rock association,we infer that the major ore-controlling factors for iron mineralization include sedimentary formation,Fe geochemical anomalies and rock association in the region. We use sedimentary formation and Fe geochemical anomalies as the evidence to predict iron ore resources. There are three prospecting areas,i.e. one A type and two C-type places,which are all of the sedimentary metamorphic type. After delineating the forecast areas of iron ores,we estimate the quantity of undiscovered ore deposits in these areas and simulate the distribution features,grade and tonnage about the ores in these areas. Then we estimate the resource with different probability and make the evaluation of resource potential fast and accurately. The result indicates some resource potential of iron ores in the area. This study can serve the exploration and deployment work of iron ores in the western section of the East Kunlun.