Abstract
SEM-EDS analysis of cobalt-rich Fe–Mn crusts (CRFMC) and their substrate rocks from the Gummy Bear seamount in the northwestern Pacific Ocean and the Magellan seamounts (Ilyicheva and Vulcanologist guyots) in the subequatorial Pacific Ocean revealed the presence of accessory (0.6–40 μm) two- and three-component minerals of the Ag–Au–Cu system, which is indicative of a wider distribution of authigenic gold mineralization than one would expect for such deposits. A concept for the biogeochemical genesis of these natural alloys was proposed, including the processes of biosorption, bioaccumulation, and biotransformation of metal ions by microbial cells to their metallic nano- and microforms.
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