Abstract
It has been found when studying the distribution of 57 elements in flattened, pellet-shaped, and pipelike iron-manganese concretions of the Kara Sea, that the F2O3 and MnO2 contents in them are 52.5 and 5.30%; 18.3 and 24.2%; and 13.0 and 0.44%, respectively. The pellet-shaped concretions are enriched with nonferrous metals and microelements (especially with arsenic, cobalt, molybdenum, and animony) to the highest degree relative to the sediments, the flattened concretions are enriched to a lesser degree, and the pipelike ones are enriched to the least degree. The relative enrichment with the medium elements and a negative cerium anomaly are observed in the distribution of the rare-earth elements, which is also revealed in the host sediments to a lesser degree. The low content of ore and rare elements in the iron-manganese concretions of the Kara Sea relative to oceanic concretions is related mostly to the high sedimentation rates and short exposition period of the concretions on the sea bottom.
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