Data/hora: 01/06/2024 14:29:52

Provedor de dados: | 5
País: | France
Título: | On the early fate of hydrothermal iron at deep-sea vents: A reassessment after in situ filtration
Autores: | Waeles, Mathieu; Cotte, Laura; Pernet-coudrier, Benoit; Chavagnac, V.; Cathalot, Cecile; Leleu, T.; Laes-huon, Agathe; Perhirin, Antoine; Riso, R. D.; Sarradin, Pierre-marie.
Data: | 2017-05-09
Ano: | 2017
Palavras-chave: | Hydrothermal; Iron; Sulfide; Venting; Filtration; Precipitation.
Resumo: | Deep-sea hydrothermal venting is now recognized as a major source of iron (Fe), an essential trace element that controls marine productivity. However, the reactions occurring during dispersal from buoyant plumes to neutrally buoyant hydrothermal plumes are still poorly constrained. Here we report for the first time on the dissolved-particulate partition of Fe after in situ filtration at the early stage of mixing at different hydrothermal discharges, i.e., Lucky Strike (37 degrees N), TAG (26 degrees N), and Snakepit (23 degrees N) on the Mid-Atlantic Ridge. We found that hydrothermal iron is almost completely preserved (&gt;90%) in the dissolved fraction, arguing for low iron-bearing sulfide precipitation of iron in basalt-hosted systems with low Fe:H2S ratios. This result can only be explained by a kinetically limited formation of pyrite. The small part of Fe being precipitated as sulfides in the mixing gradient (&lt;10%) is restricted to the inclusion of Fe in minerals of high Cu and Zn content. We also show that secondary venting is a source of Fe-depleted hydrothermal solutions. These results provide new constrains on Fe fluxes from hydrothermal venting.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00388/49944/50522.pdf

https://archimer.ifremer.fr/doc/00388/49944/50523.pdf

https://archimer.ifremer.fr/doc/00388/49944/50524.pdf

https://archimer.ifremer.fr/doc/00388/49944/50525.xlsx

DOI:10.1002/2017GL073315

https://archimer.ifremer.fr/doc/00388/49944/

Editor: | Amer Geophysical Union
Formato: | application/pdf
Fonte: | Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2017-05-09 , Vol. 44 , N. 9 , P. 4233-4240

Fonte:

017. American Geophysical Union. All Rights Reserved.

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