Origin of Ferruginous Quartzites of the Kursk Magnetic Anomaly

摘要

Based on electron microscopic studies of minerals from iron-ore formations, a conclusion on different geneses of the composing rocks is made. Quartz of ferruginous quartzites originated through metaso-matic transformation of primary biogenic limestones, while iron minerals were formed due to cyclic iron supply from deep-seated sources. Schists' interlayers correspond to breaks in carbonate precipitation in periods of supply of terrigenous material from land or pyroclastics from volcanoes.