FARA SIGMA

Type Oceanographic cruise
Ship L'Atalante
Ship owner Ifremer
Dates 01/06/1991 - 07/07/1991
Chief scientist(s) NEEDHAM Hubert David

GEO-OCEAN - UMR 6538

Univ. Brest, CNRS, Ifremer, Univ. Bretagne Sud

Place Nicolas Copernic

29280 Plouzané

https://www.geo-ocean.fr/
DOI 10.17600/91004311
Objective The main objectives were to obtain: 1) Almost-complete bathymetric coverage of the axial zone of the Mid-Atlantic Ridge between 40N and 33N, in order to highlight the geometry of structures of rift valley s segments and the offsetting zones between segments; 2) Magnetism and gravimetry data in order to study the relationships between the structure and accretion processes. The cruise also made it possible to supplement knowledge about the crest of the ridge between 33N and 17N and obtain 4 samples in the framework of a study on sedimentary recording of hydrothermalism, as well as 4 basalt samples.

Data managed by SISMER

Sampling operations

Bibliography

Publications

Pichot Thibaud, Patriat MartinORCID, Westbrook Graham, Nalpas T., Gutscher Marc-Andre, Roest WalterORCID, Deville E., Moulin M.ORCID, Aslanian DanielORCID, Rabineau MarinaORCID (2012). The Cenozoic tectonostratigraphic evolution of the Barracuda Ridge and Tiburon Rise, at the western end of the North America-South America plate boundary zone. Marine Geology, 303, 154-171. https://doi.org/10.1016/j.margeo.2012.02.001


Niu Yl, Bideau Daniel, Hekinian Roger, Batiza R (2001). Mantle compositional control on the extent of mantle melting, crust production, gravity anomaly, ridge morphology, and ridge segmentation: a case study at the Mid-Atlantic Ridge 33-35 degrees N. Earth And Planetary Science Letters, 186(3-4), 383-399. https://doi.org/10.1016/S0012-821X(01)00255-2


Hekinian Roger, Pineau F, Shilobreeva S, Bideau Daniel, Gracia E, Javoy M (2000). Deep sea explosive activity on the Mid-Atlantic Ridge near 34 degrees 50 ' N: Magma composition, vesicularity and volatile content. Journal Of Volcanology And Geothermal Research, 98(1-4), 49-77. https://doi.org/10.1016/S0377-0273(99)00190-0


Gracia Eulalia, Bideau Daniel, Hekinian Roger, Lagabrielle Yves (1999). Detailed geological mapping of two contrasting second-order segments of the Mid-Atlantic Ridge between Oceanographer and Hayes fracture zones (33 degrees 30 ' N-35 degrees N). Journal Of Geophysical Research-solid Earth, 104(B10), 22903-22921. https://doi.org/10.1029/1999JB900161


Bideau Daniel, Hekinian Roger, Sichler Bertrand, Gracia E, Bollinger C, Constantin Marc, Guivel Christelle (1998). Contrasting volcanic-tectonic processes during the past 2 Ma on the Mid-Atlantic Ridge: submersible mapping, petrological and magnetic results at lat. 34°52′ N and 33°55′ N. Marine Geophysical Research, 20(5), 425-458. https://doi.org/10.1023/A:1004760111160


Gràcia Eulàlia, Parson Lindsay M., Bideau Daniel, Hekinian Roger (1998). Volcano-tectonic variability along segments of the Mid-Atlantic Ridge between Azores platform and Hayes fracture zone: evidence from submersible and high-resolution sidescan sonar data. Geological Society, London, Special Publications, 148(1), 1-15. https://doi.org/10.1144/GSL.SP.1998.148.01.01


Ondreas Helene, Fouquet Yves, Voisset Michel, Radford-Knoery JoelORCID (1997). Detailed Study of Three Contiguous Segments of the Mid-Atlantic Ridge, South of the Azores (37º N to 38º30€ N), Using Acoustic Imaging Coupled with Submersible Observations. Marine Geophysical Researches, 19(3), 231-255. https://doi.org/10.1023/A:1004230708943


Detrick Robert S, Needham Hd, Renard Vincent (1995). Gravity anomalies and crustal thickness variations along the Mid-Atlantic Ridge between 33°N and 40°N. Journal Of Geophysical Research-solid Earth, 100(B3), 3767-3787. https://doi.org/10.1029/94JB02649


Dosso Laure, Bougault Henri, Joron Jean-Louis (1993). Geochemical morphology of the North Mid-Atlantic Ridge, 10°–24°N: Trace element-isotope complementarity. Earth and Planetary Science Letters, 120(3-4), 443-462. https://doi.org/10.1016/0012-821X(93)90256-9


References of Technical Reports

Schiellerup H, Ferreira P, Gonzalez Fj, Marino E, Somoza L, Medialdea T (2021). MINDeSEA Seabed Mineral Deposits in European Seas: Metallogeny and Geological Potential for Strategic and Critical Raw Materials. Deliverable 3.3: Metallogeny of hydrothermal deposits in European waters. https://archimer.ifremer.fr/doc/00701/81274/


Viellefon Priscille (2020). Cartographie – Compilation et analyses numériques de données bathymétriques sur la dorsale Atlantique Nord centrale. Rapport de stage technique. https://archimer.ifremer.fr/doc/00679/79153/


Dyment Jérôme, Lallier François, Le Bris Nadine, Rouxel OlivierORCID, Sarradin Pierre-MarieORCID, Lamare Sylvain, Coumert Coralie, Morineaux Marie, Tourolle JulieORCID (2014). Les impacts environnementaux de l’exploitation des ressources minérales marines profondes. Expertise scientifique collective. Rapport, CNRS – Ifremer, 937 p. https://archimer.ifremer.fr/doc/00872/98434/


(1991) SIGMA '91.


Thesis using campaign data

Le Gal Virginie (2017). Traçage thermique et géochimique des systèmes hydrothermaux : exemple d'un domaine océanique jeune et d'une marge continentale / Thermal and geochemical tracing of hydrothermal systems : example of a young oceanic domain and a continental margin. PhD Thesis, Université Pierre et Marie Curie.