(Tables 41-42, page 88-89), Chemical composition of lake ores of Finland and North-Western Russia

This text deals with the geochemistry of iron ores. By means of spectrochemical analyses some significant minor constituents have been determined in samples mainly from the pre-Cambrian iron-ore regions of Sweden. For the sake of comparison some samples of iron ores of different age from non-Swedish regions have been analysed. On the basis of the analytical data available some significant statistical quantities have been computed in iron ores as well as in the main igneous rock series. Special regard has been paid to the relationship between the distribution principles governing some major constituents in the iron ores, on the one hand, and in the igneous rocks on the other. A method is proposed for geochemical investigations of igneous rocks by means of statistical data. With the aid of geochemical premises the endogene relationship between iron ores and their associated igneous rocks has been discussed. A theory on the principles governing the formation of iron ores has been advanced and employed with special regard to the origin of the pre-Cambrian iron ores of Sweden.

本研究围绕铁矿石地球化学展开。通过光谱化学分析（spectrochemical analyses），研究人员对主要采自瑞典前寒武纪（pre-Cambrian）铁矿石产区的样品中的若干关键微量组分完成了测定。为便于对比分析，研究人员同时对不同年代、产自瑞典以外地区的铁矿石样品开展了分析测试。基于已获取的全部分析数据，研究人员针对铁矿石以及主要火成岩（igneous rock）系列计算得到了多项关键统计参数。研究重点关注了两方面的分布规律关联：一方面是铁矿石中部分主要组分的分布规律，另一方面则是火成岩中对应组分的分布规律。本研究提出了一种基于统计数据开展火成岩地球化学研究的方法。借助地球化学相关理论前提，本研究探讨了铁矿石与其伴生火成岩之间的内生成因关联。此外，本研究提出了一套铁矿石形成机制理论，并将其重点应用于瑞典前寒武纪铁矿石的成因研究中。