Abstract

High-grade iron ores and bauxites of the Kursk magnetic anomaly (KMA) were formed in weathering crusts on the Early Precambrian ferruginous quartzites and shales, i.e., banded iron formation (BIF). Thus far, weathering crusts on the BIF were considered separately, although they formed simultaneously and represent a single sequence in each ore region. Therefore, it is of great interest to compare the coeval weathering crusts on rocks of the formation under consideration for a complex prediction of high-grade iron ores and bauxites. The obtained results showed that the BIF-hosted iron ores were formed during all stages of crust formation in the Paleozoic and such ores can be predicted throughout the KMA, whereas bauxites were only formed in inter-ore shales on the southwestern flank of the anomaly.

中文翻译：

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库尔斯克磁异常（俄罗斯）中高品位铁矿石和相关铝土矿形成的历史-成因分析

摘要

库尔斯克磁异常（KMA）的高品位铁矿石和铝土矿形成于早前寒武世铁质石英岩和页岩的风化壳中，即带状铁地层（BIF）。到目前为止，BIF 上的风化壳被单独考虑，尽管它们同时形成并代表每个矿区的单个序列。因此，为了对高品位铁矿石和铝土矿进行复杂预测，比较正在考虑的地层岩石上的同时代风化壳是非常有意义的。结果表明，在古生代结壳形成的各个阶段都形成了以BIF为主体的铁矿石，并且在整个KMA范围内都可以预测到这种矿石，而铝土矿仅在异常西南侧的矿间页岩中形成。