Abstract
Based on materials obtained in Cruises 33 and 34 of the R/V Professor Logachev, the paper addresses formation conditions, morphology, structures, mineral composition of the present-day oceanic sulfide ores, and their relationships with the host (biogenic carbonate) bottom sediments in the 19°–20° N MAR (Zenith-Victoria and Petersburg hydrothermal fields) region. The grain size distribution, mineral composition of the carbonate (background) and ore-hosting sediments, as well as physicochemical parameters of their interstitial waters, are examined. The results suggest a significant role of hydrothermal-metasomatic processes in the formation of ores and ore-bearing sediments. A model is proposed for the formation of sulfide mineralization in oceanic sediments at the geochemical barrier in the zone of their interaction with the acid hydrothermal (diffuse-type) ore-bearing solutions delivered from rocks of the ocean floor.
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Original Russian Text © I.F. Gablina, I.G. Dobretsova, E.V. Narkevskii, A.N. Gustaitis, T.A. Sadchikova, N.V. Gor’kova, A.T. Savichev, A.D. Lyutkevich, O.M. Dara, 2017, published in Litologiya i Poleznye Iskopaemye, 2017, No. 5, pp. 387–408.
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Gablina, I.F., Dobretsova, I.G., Narkevskii, E.V. et al. Influence of hydrothermal-metasomatic processes on the formation of present-day sulfide ores in carbonate bottom sediments of the mid-Atlantic Ridge (19°–20° N). Lithol Miner Resour 52, 335–357 (2017). https://doi.org/10.1134/S0024490217050030
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DOI: https://doi.org/10.1134/S0024490217050030