| 中国铁矿床品位-吨位模型 |
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| 引用本文：阴江宁，肖克炎，邹 伟，丁建华，娄德波.2008.The grade and tonnage model for China's iron deposits [J].Mineral Deposits,27(6):782~790 |
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| 基金项目:中国地质调查局项目“全国重要矿产总量预测"（编号：1212010733806） |
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| 中文摘要:文章以2005年国家有关部门公布的铁矿储量数据为依据，在拥有翔实和权威的铁矿数据材料的基础上，经过分析整理和统计计算，以铁矿的6种矿床类型（沉积变质型、沉积型、矽卡岩型、岩浆岩型、火山岩型和风化型）为划分依据，建立了中国铁矿及其伴生矿种的品位和吨位模型，并对其品位_吨位联合分布的模型进行了研究。通过研究得出结论，中国铁矿的资源量不服从正态分布，经过对数变换后服从正态分布，品位除了矽卡岩之外都直接服从正态分布。由于铁矿的品位和吨位之间相关性较差，因而不具备分形特征。最后通过建立吨位和品位的直方图来构造正态分布函数，从而实现累计概率曲线的拟合。在取得了远景区的矿床类型、矿床数分布以及矿床的品位和吨位的累计概率曲线后，可以使用计算机通过蒙特卡洛模拟的方法来实现远景区资源量的预测和模拟。 |
| 中文关键词:地质学 铁矿 品位 吨位 正态分布 概率 |
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| The grade and tonnage model for China's iron deposits |
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| Abstract:The grade and tonnage of a deposit constitute the basis and important reference criteria in the assessment of mineral resources, and hence make up the leading research orientation in this aspect. If researchers want to establish a grade and tonnage model for a certain metal, they must possess as many precise data as possible, otherwise the statistical significance will be lost. The standard grade and tonnage model can be established on the basis of careful researches on the distribution and type features. Once the grade and tonnage model is established, it can be used to predict the potential quantity and quality of the main and associated ores in the ore district. This paper is based on the data of iron resource provided by the national related department in 2005, which can ensure that the resource data are full and accurate. Through a careful statistic analysis based on experts' idea that iron deposits can be classified into six types (metamorphosed sedimentary deposits, sedimentary deposits, skarn deposits, magmatic deposits, volcanic deposits and weathering deposits), a grade and tonnage model for iron deposits was established and the features of their distribution were studied. It is concluded that the iron quantity of different deposit types does not accord with the normal distribution but is in accord with the log_normal distribution. The grade of the iron deposit directly accords with the normal distribution except for that of the skarn deposit. As the relationship between the tonnage and the grade of iron is indistinct, the ton and grade of an iron deposit do not have fractal features. The accumulated probabilities distribution curve of iron tonnage and grade can be acquired through constructing the function of normal distribution by means of histogram. When the type and the amount of a deposit as well as the accumulated probabilities distribution curve of iron tonnage and grade are obtained, the computer can be used to estimate the potential quantity of the ore district by means of Monte Carlo simulation. |
| keywords:geology, iron deposit, grade, tonnage, normal distribution, probabilities |
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