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| Rouxel, Olivier; Toner, Brandy; Germain, Yoan; Glazer, Brian. |
| Low-temperature hydrothermal vents, such as those encountered at Loihi Seamount, harbor abundant microbial communities and provide ideal systems to test hypotheses on biotic versus abiotic formation of hydrous ferric oxide (FeOx) deposits at the seafloor. Hydrothermal activity at Loihi Seamount produces abundant microbial mats associated with rust-colored FeOx deposits and variably encrusted with Mn-oxyhydroxides. Here, we applied Fe isotope systematics together with major and trace element geochemistry to study the formation mechanisms and preservation of such mineralized microbial mats. Iron isotope composition of warm (< 60 °C), Fe-rich and H2S-depleted hydrothermal fluids yielded δ56Fe values near +0.1 ‰, indistinguishable from basalt values.... |
| Tipo: Text |
Palavras-chave: Hydrothermal Systems; Seamounts; Iron Isotopes; Mineral deposits. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00405/51646/52195.pdf |
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