Abstract
Sulfide ores were investigated along with ore-bearing and metalliferous sediments of the hydrothermal fields in the northern near-equatorial Mid-Atlantic Ridge (MAR) zone: Semenov (13°30–31′N), Ashadze-1 (12°58′N), Zenit-Victoria (20°08′N), and Peterburgskoe fields (19°52′N), discovered during legs 26, 32, and 33 of the R/V Professor Logachev FSUE PMGE. Biogenic carbonate and background sediments of this region were also examined. Lithological, biostratigraphic, and geochemical physical-chemical investigations methods were used. Mineragraphic and precision structural and chemical research of typomorphic minerals were carried out at various stages of lithogenesis. It was found out that most sulfide constructions in the Zenit-Victoria and Peterburgskoe fields, as well as the eastern field of the Semenov cluster, are located in biogenic carbonate sediments of the Holocene and Late Pleistocene ages and represent a new type of sulfide mineralization, unknown earlier in the MAR zone. This mineralization was formed by metasomatic replacement of biogenic carbonate sediments by ore minerals, simultaneously with diffuse percolating of hydrothermal solutions through the sediments.
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