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Título: | A Polyextreme Hydrothermal System Controlled by Iron: The Case of Dallol at the Afar Triangle |
Autor: | Kotopoulou, Electra CSIC ORCID; Delgado Huertas, Antonio CSIC ORCID ; García Ruiz, Juan Manuel CSIC ORCID; Domínguez-Vera, José M.; López García, José María; Guerra Tschuschke, Isabel; Rull, Fernando CSIC ORCID | Fecha de publicación: | 1-ene-2019 | Editor: | American Chemical Society | Citación: | ACS Earth and Space Chemistry 3: 90-99 (2019) | Resumen: | One of the latest volcanic features of the Erta Ale range at the Afar Triangle (NE Ethiopia) has created a polyextreme hydrothermal system located at the Danakil depression on top of a protovolcano known as the dome of Dallol. The interaction of the underlying basaltic magma with the evaporitic salts of the Danakil depression has generated a unique, higherature (108 °C), hypersaline (NaCl supersaturated), hyperacidic (pH values from 0.1 to â?1.7), oxygen-free hydrothermal site containing up to 150 g/L of iron. We find that the colorful brine pools and mineral patterns of Dallol derive from the slow oxygen diffusion and progressive oxidation of the dissolved ferrous iron, the iron-chlorine/-sulfate complexation, and the evaporation. These inorganic processes induce the precipitation of nanoscale jarosite-group minerals and iron(III)-oxyhydroxides over a vast deposition of halite displaying complex architectures. Our results suggest that life, if present under such conditions, does not play a dominant role in the geochemical cycling and mineral precipitation at Dallol as opposed to other hydrothermal sites. Dallol, a hydrothermal system controlled by iron, is a present-day laboratory for studying the precipitation and progressive oxidation of iron minerals, relevant for geochemical processes occurring at early Earth and Martian environments. | Versión del editor: | http://dx.doi.org/10.1021/acsearthspacechem.8b00141 | URI: | http://hdl.handle.net/10261/203882 | DOI: | 10.1021/acsearthspacechem.8b00141 | Identificadores: | doi: 10.1021/acsearthspacechem.8b00141 issn: 2472-3452 |
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