H
Hélène Ondréas
Researcher at IFREMER
Publications - 52
Citations - 2354
Hélène Ondréas is an academic researcher from IFREMER. The author has contributed to research in topics: Seafloor spreading & Mid-Atlantic Ridge. The author has an hindex of 26, co-authored 52 publications receiving 2186 citations.
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Book ChapterDOI
High production and fluxes of H2 and CH4 and evidence of abiotic hydrocarbon synthesis by serpentinization in ultramafic‐hosted hydrothermal systems on the Mid‐Atlantic Ridge
Jean Luc Charlou,Jean Pierre Donval,Cecile Konn,Hélène Ondréas,Yves Fouquet,Philippe Jean-Baptiste,Elise Fourré +6 more
Book ChapterDOI
Geodiversity of hydrothermal processes along the Mid-Atlantic Ridge and ultramafic-hosted mineralization: A new type of oceanic Cu-Zn-Co-Au volcanogenic massive sulfide deposit
Yves Fouquet,Pierre Cambon,Joel Etoubleau,Jean Luc Charlou,Hélène Ondréas,Fernando J.A.S. Barriga,Georgy Cherkashov,Tatiana Semkova,Irina Poroshina,Marcel Bohn,Jean Pierre Donval,K. Henry,Pamela Murphy,Olivier Rouxel +13 more
TL;DR: Fouquet et al. as mentioned in this paper proposed a solution chemistry model and a mechanism for Cu/Zn zonation in massive sulphide orebodies, in Hydrothemal Vents and Processes, edited by L. Parson et al., pp 77-86, Geol. Soc.
Journal ArticleDOI
Cold-seep assemblages on a giant pockmark off West Africa: spatial patterns and environmental control
K. Olu-Le Roy,Jean-Claude Caprais,A. Fifis,M.‐C. Fabri,Joëlle Galéron,H. Budzinsky,K. Le Menach,Alexis Khripounoff,Hélène Ondréas,Myriam Sibuet +9 more
TL;DR: A giant pockmark colonised by dense cold-seep assemblages near 3160m depth along the CongoAngola margin has been surveyed by the ROV Victor 6000.
Journal ArticleDOI
Architecture of an active mud-rich turbidite system: The Zaire Fan (Congo–Angola margin southeast Atlantic)Results from ZaïAngo 1 and 2 cruises
TL;DR: In this paper, the authors used multichannel seismic data acquired during two ZaAngo surveys to provide an almost complete view of the Quaternary architecture of the Zaire Fan.
Journal ArticleDOI
Physical and chemical characterization of gas hydrates and associated methane plumes in the Congo-Angola Basin
Jean-Luc Charlou,Jean-Pierre Donval,Yves Fouquet,Hélène Ondréas,Joël Knoery,Pierre Cochonat,D. Levache,Y Poirier,Philippe Jean-Baptiste,Elise Fourré,B. Chazallon +10 more
TL;DR: As a part of the ZAIANGO IFREMER/TOTAL-FINA-ELF program, gas hydrates were collected from a gravity sediment core on the Congo-Angola margin during the ZAI-ROV cruise (December 2000) as mentioned in this paper.