Consulta: subjectFacets:"Hydrothermal systems"
Registros recuperados: 5
Data/hora: 09/06/2024 02:42:29

Microbial colonization of basaltic glasses in hydrothermal organic-rich sediments at Guaymas Basin
Provedor de dados: 5
Autores: Callac, Nolwenn; Rommevaux-jestin, Celine; Rouxel, Olivier; Lesongeur, Francoise; Liorzou, Celine; Bollinger, Claire; Ferrant, Anthony; Godfroy, Anne.
Oceanic basalts host diverse microbial communities with various metabolisms involved in C, N, S, and Fe biogeochemical cycles which may contribute to mineral and glass alteration processes at, and below the seafloor. In order to study the microbial colonization on basaltic glasses and their potential biotic/abiotic weathering products, two colonization modules called AISICS ("Autonomous in situ Instrumented Colonization System") were deployed in hydrothermal deep-sea sediments at the Guaymas Basin for 8 days and 22 days. Each AISICS module contained 18 colonizers (including sterile controls) filled with basaltic glasses of contrasting composition. Chemical analyses of ambient fluids sampled through the colonizers showed a greater contribution of...
Tipo: Text
Palavras-chave: Colonization module; Basalt alteration; Guaymas basin; Organic-rich sediment; Hydrothermal systems.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00181/29261/27642.pdf

Hydrothermal Vents: Oases at Depth
Provedor de dados: 5
Autores: Sarrazin, Jozee; Desbruyeres, Daniel.
The synthesis of organic molecules in hydrothermal fluids raises the question of what role hydrothermal vents may have played in the emergence of life on Earth. These deep‐sea ecosystems were most likely protected from extreme conditions at the surface (meteor showers and ultraviolet radiation). Since the middle of the 19th century, scientists have questioned the position of deep‐sea animals in the evolution of marine fauna, in the hope to discover the missing link, i.e. the species or group that may have survived mass extinctions in this protected and stable environment. This chapter discusses the geology and geochemistry of hydrothermal systems, microbial chemosynthesis, symbioses and trophic chains, and fauna at different spatial scales. Fauna...
Tipo: Text
Palavras-chave: Chemical composition; Deep‐sea animals; Deep‐sea ecosystems; Faunal microdistribution; Hydrothermal fluids   hydrothermal system geochemistry; Hydrothermal system geology; Hydrothermal systems; Marine fauna; Microbial chemosynthesis.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00648/75995/76898.pdf

Cartographie haute résolution des champs hydrothermaux de la ride sud du bassin de Guaymas
Provedor de dados: 5
Autores: Ondreas, Helene; Scalabrin, Carla; Fouquet, Yves; Godfroy, Anne.
Insights into the factors controlling fluid circulation through the crust and the nature of fluid venting at the seafloor are first steps in understanding their effect on ocean properties and climate change. New data on the seafloor morphology, sub-surface sedimentary stratification, and water column of the sedimented Southern Trough hydrothermal field (Guaymas basin) were acquired during the BIG cruise in 2010. These data provide accurate and high-resolution information on the geological context of the vents, on the distribution of acoustic anomalies in the water column, and on the possible nature of the fluid generating these echoes. More than 40 hydrothermal edifices were observed. The southern zone of the study area hosts hydrothermal sites that differ...
Tipo: Text
Palavras-chave: Mid-ocean ridges; Sedimented ridge; Hydrothermal systems; Fluid migration; Water-column acoustic images; Guaymas basin.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00436/54775/56229.pdf

Seafloor Massive Sulfides from the Northern Equatorial Mid-Atlantic Ridge: New Discoveries and Perspectives
Provedor de dados: 5
Autores: Cherkashov, G.; Poroshina, I.; Stepanova, T.; Ivanov, V.; Bel'Tenev, V.; Lazareva, L.; Rozhdestvenskaya, I.; Samovarov, M.; Shilov, V.; Glasby, G. P.; Fouquet, Yves; Kuznetsov, V.
In addition to the two new hydrothermal fields Krasnov (l6 degrees 38' N) and Ashadze (13 degrees N) discovered in 2003-2004, some later discoveries were made in the Northern Equatorial segment of the Mid-Atlantic Ridge (MAR). Two new major seafloor massive sulfide (SMS) deposits: Semyenov (13 degrees 31' N) and Zenith-Victory (20 degrees 08' N), as well as the now extended Puy des Folles hydrothermal field (20 degrees 30.5' N), provide enough data to make conclusions about the general characteristics of SMS deposits in the northern equatorial MAR environment. Parameters of SMS deposits, such as their distribution, geological setting, morphology, composition and age, are discussed in this paper. A majority of studied SMS deposits (Ashadze, Logatchev,...
Tipo: Text
Palavras-chave: Hydrothermal systems; Mid-atlantic ridge; Seafloor massive sulfides.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00013/12413/9800.pdf

Defining active, inactive, and extinct seafloor massive sulfide deposits
Provedor de dados: 5
Autores: Jamieson, J.w.; Gartman, A.
Hydrothermal activity results in the formation of hydrothermal mineral deposits, including seafloor massive sulfide deposits, at oceanic spreading ridges, arcs, and back-arcs. As hydrothermal systems age, the mineral deposits eventually become severed from the heat source and fluid-flow pathways responsible for their formation and become extinct. The timescales and processes by which this cessation of activity occurs, and the resultant distinction between hydrothermally active and inactive deposits has recently taken on policy implications related to the potential issuance of exploitation leases for seafloor massive sulfide deposits by the International Seabed Authority in Areas Beyond National Jurisdiction. Here, we discuss the scientific rationale behind...
Tipo: Text
Palavras-chave: Hydrothermal systems; Seafloor massive sulfide deposits; Inactive deposits; Seafloor mining.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00618/72972/72039.pdf