Data/hora: 09/06/2024 11:41:55

Provedor de dados: 	5	
País: 	France	
Título: 	Prokaryote Communities at Active Chimney and In‐Situ Colonization Devices after a Magmatic Degassing Event (37°N MAR, EMSO‐Azores Deep‐Sea Observatory)	
Autores: 	Rommevaux, Céline; Henri, Pauline; Degboe, Jefferson; Chavagnac, Valérie; Lesongeur, Francoise; Godfroy, Anne; Boulart, Cedric; Destrigneville, Christine; Castillo, Alain.	
Data: 	2019-06	
Ano: 	2019	
Palavras-chave: 	Lucky Strike; Magmatic degassing; Microbial community structure; Multidisciplinary study.	
Resumo: 	The mixing zone between high temperature hydrothermal fluids and seawater produces redox gradients, promoting the development of unique ecosystems based on chemotrophy. The structure of microbial communities depends on their environment, which can vary according to space and time. Hydrothermal circulation within the oceanic crust determines the chemical composition and flow of fluids, depending on underground events (earthquakes, volcanic episodes....), and impacts the development of microbial communities. This link between hydrothermal vent communities and deep geological events is the focus of the present study, the first of its kind for slow‐spreading ridge. In this study, we present a unique set of multidisciplinary data collected from 2008 to 2011 on the Eiffel Tower hydrothermal site (Lucky Strike vent field, Mid‐Atlantic Ridge). We benefit from continuous geophysical monitoring (temperature, seismicity) of the site, annual sampling of hydrothermal fluids (hot and diffuse) for geochemistry analyses, sampling of hydrothermal chimneys and an in situ microbial colonization experiments over a year for microbial study. The high CO2 content and concentrations of major elements (Cl, Ca, Si) and SO4 in the end‐member fluids collected in 2010, indicate that a magmatic degassing occurred between 2009 and 2010 under the Lucky Strike hydrothermal field. This is supported by the large temperature variations observed in March‐April 2010. These magmatic CO2 inputs seem to have affected microbial communities’ colonizing the high temperature chimney, as well as the basalts in the more diffuse and mixed zone, promoting the development of thermophilic/anaerobic Archaea and Bacteria (Archaeoglobales, Nautiliales, Nitratiruptoraceae).	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	https://archimer.ifremer.fr/doc/00500/61174/64657.pdf

https://archimer.ifremer.fr/doc/00500/61174/64658.pdf

https://archimer.ifremer.fr/doc/00500/61174/64659.pdf

https://archimer.ifremer.fr/doc/00500/61174/64660.pdf

DOI:10.1029/2018GC008107

https://archimer.ifremer.fr/doc/00500/61174/	
Editor: 	American Geophysical Union (AGU)	
Formato: 	application/pdf	
Fonte: 	Geochemistry Geophysics Geosystems (1525-2027) (American Geophysical Union (AGU)), 2019-06 , Vol. 20 , N. 6 , P. 3065-3089	
Fonte: 	info:eu-repo/semantics/openAccess

restricted use