Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 47171 ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ Mineralogy and geochemistry of sulfide ores in ocean-floor hydrothermal fields associated with serpentinite protrusions Mineralogy and geochemistry of sulfide ores in ocean-floor hydrothermal fields associated with serpentinite protrusions Lein A Yu Lein A Yu Ulyanova N V Ulyanova N V Ulyanov A A Ulyanov A A Cherkashev G A Cherkashev G A Stepanova T V Stepanova T V Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia ru Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia ru Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia ru Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia ru Moscow State University, Moscow, Russia ru Moscow State University, Moscow, Russia ru All-Russian Research Institute of Oceanology, Sankt-Petersburg, Russia ru All-Russian Research Institute of Oceanology, Sankt-Petersburg, Russia ru All-Russian Research Institute of Oceanology, Sankt-Petersburg, Russia ru All-Russian Research Institute of Oceanology, Sankt-Petersburg, Russia ru 3 5 371 393 11 11 2021 https://rjes.ru/en/nauka/article/47171/view

The aim of this paper is to analyze and compare the mineralogy and geochemistry of copper-zinc sulfide ores from the Logachev-2 and Rainbow hydrothermal fields of the Mid-Atlantic Ridge MAR, confined to serpentinite protrusions. It was found that the ZnFe and Cu, FeZn sulfides had been deposited in black smokers pipes almost simultaneously from intermittently flowing, nonequilibrium H 2 S-low solutions of different temperatures. The Pb isotope composition confirmed that the source of lead had been the deep oceanic crust. The ores of the Rainbow Field contain 20-fold more Co than the ores restricted to the basalts and show a high ratio of Co/Ni = 46. The Rainbow ore is enriched in heavy 34S isotope d34Sav = 10 because of the constant flow of cold sea water into the subsurface zone of the hydrothermal system. The ore of the Logachev-2 field is 8 times higher in gold compared to the other MAR regions. The sulfide ores of the Rainbow and Logachev-2 fields have no analogues among the MAR ore occurrences in terms of the enrichment in useful components Zn, Cd, Co, and Au.

The aim of this paper is to analyze and compare the mineralogy and geochemistry of copper-zinc sulfide ores from the Logachev-2 and Rainbow hydrothermal fields of the Mid-Atlantic Ridge MAR, confined to serpentinite protrusions. It was found that the ZnFe and Cu, FeZn sulfides had been deposited in black smokers pipes almost simultaneously from intermittently flowing, nonequilibrium H 2 S-low solutions of different temperatures. The Pb isotope composition confirmed that the source of lead had been the deep oceanic crust. The ores of the Rainbow Field contain 20-fold more Co than the ores restricted to the basalts and show a high ratio of Co/Ni = 46. The Rainbow ore is enriched in heavy 34S isotope d34Sav = 10 because of the constant flow of cold sea water into the subsurface zone of the hydrothermal system. The ore of the Logachev-2 field is 8 times higher in gold compared to the other MAR regions. The sulfide ores of the Rainbow and Logachev-2 fields have no analogues among the MAR ore occurrences in terms of the enrichment in useful components Zn, Cd, Co, and Au.

 mineralogy geochemistry ocean-floor hydrothermal fields serpentinite protrusions. mineralogy geochemistry ocean-floor hydrothermal fields serpentinite protrusions.

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