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| 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 |
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| 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 |
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| 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 |
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