PARISUB

Type Oceanographic cruise
Ship L'Atalante
Ship owner Ifremer
Dates 19/03/2010 - 17/04/2010
Chief scientist(s) GENTE Pascal

GEO-OCEAN - UMR 6538

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

Place Nicolas Copernic

29280 Plouzané

https://www.geo-ocean.fr/
DOI 10.17600/10010020
Objective

The main objective of the PARISUB (acronym for PAnache-RIde SUBmersible) project is to make a detailed study of interaction between a ridge and a hotspot. The study aims to understand the intimate processes which are expressed through the accretion coming from the hotspot. In fact, the presence of a thermal and chemical anomaly in the vicinity of a ridge will disturb the accretion processes in terms of instability of the axial zone(axis offsets), the magma production and the chemistry of the lava there (matter enriched with incompatible elements which come from the hotspot). The nature of these modifications will delimit both the scope of interaction between liquids from the hotspot and those from accretion and how they mix and will provide information about the periodicity of the variations. There are two main reasons for studying the Mathematician hotspot system on the East Pacific ridge at 16°N, i.e. its accessibility (close to Mexico) and the good quality data which exist for it. The zone is characterized by two successive axis offsets of about 7-10 km in the direction of the hotspot, and a step in the flank topography which is probably where the interaction begins. The current axis is about 400 m higher than the average ridge height in the North Pacific and the axial crest shows a swollen aspect indicating high production of magma. The lava sampled along this axis display an enrichment in incompatible elements which is typical of a hotspot source and thus show that the axis is contaminated by magma from the plume with a single accretion segment being affected by the influence of this mini-hotspot. In addition to this set of issues, the study zone selected displays significant hydrothermal activity which can be seen through the measurement taken in the plume it creates. This theme will be easily addressed through axial explorations in the zone on this research cruise.

Data managed by SISMER

Dives

Bibliography

Publications

Mougel Berengere, Agranier Arnaud, Gente Pascal, Hemond Christophe (2022). 320,000 years of interaction between a fast-spreading ridge and nearby seamounts monitored using major, trace and isotope composition data from oceanic basalts: Zoom at 15.6°N on the East Pacific Rise. Data In Brief, 44, 108550 (13p.). Publisher's official version : https://doi.org/10.1016/j.dib.2022.108550 , Open Access version : https://archimer.ifremer.fr/doc/00789/90110/


Mougel Berengere, Agranier Arnaud, Hemond Christophe, Gente Pascal (2021). High‐resolution isotopic variability across EPR segment 16°N: A chronological interpretation of source composition and ridge‐seamount interaction. Geochemistry Geophysics Geosystems, 22(10), e2021GC009781 (26p.). Publisher's official version : https://doi.org/10.1029/2021GC009781 , Open Access version : https://archimer.ifremer.fr/doc/00725/83669/


Le Saout M, Thibaud R., Gente Pascal (2018). Detailed Analysis of Near Tectonic Features Along the East Pacific Rise at 16 degrees N, Near the Mathematician Hot Spot. Journal Of Geophysical Research-solid Earth, 123(6), 4478-4499. Publisher's official version : https://doi.org/10.1029/2017JB015301 , Open Access version : https://archimer.ifremer.fr/doc/00638/74985/


Szitkar Florent, Dyment Jerome, Le Saout Morgane, Honsho Chie, Gente Pascal (2016). Dyking at EPR 16°N hypermagmatic ridge segment: Insights from near-seafloor magnetics. Earth And Planetary Science Letters, 453, 288-297. https://doi.org/10.1016/j.epsl.2016.08.020


Mougel Berengere, Moreira Manuel, Agranier Arnaud (2015). A "high He-4/He-3" mantle material detected under the East Pacific Rise (15 degrees 4 ' N). Geophysical Research Letters, 42(5), 1375-1383. Publisher's official version : https://doi.org/10.1002/2014GL062921 , Open Access version : https://archimer.ifremer.fr/doc/00639/75140/


Le Saout M., Deschamps Anne, Soule S. A., Gente Pascal (2014). Segmentation and eruptive activity along the East Pacific Rise at 16°N, in relation with the nearby Mathematician hot spot. Geochemistry Geophysics Geosystems, 15(11), 4380-4399. https://doi.org/10.1002/2014GC005560


Mougel Berengere, Agranier Arnaud, Hemond Christophe, Gente Pascal (2014). A highly unradiogenic lead isotopic signature revealed by volcanic rocks from the East Pacific Rise. Nature Communications, 5(4474). https://doi.org/10.1038/ncomms5474


Deschamps Anne, Grigne Cecile, Le Saout Morgane, Soule Samuel Adam, Allemand Pascal, Lanoe Brigitte Van Vliet, Floc'h France (2014). Morphology and dynamics of inflated subaqueous basaltic lava flows. Geochemistry Geophysics Geosystems, 15(6), 2128-2150. https://doi.org/10.1002/2014GC005274


References of Articles published in other Periodicals or Scientific Works acclaimed in the Field

GENTE, P., AGRANIER, A., AGUILLON-ROBLES, A., BENOIT, M., DESCHAMPS, A., DYMENT, J., HEMOND, C., JANIN, M., MAIA, M., RODRIGUES-LEON, L., SZITKAR, F., THIBAUD, R., & TILOT, V., 2010 ? Cruise PARISUB on EPR 16°N: magmatism and hydrothermalism over a ridge-hotspot interaction. InterRidge News, 19, 17-20.

References of Articles published in periodicals and magazines for the general public

Le Saout Morgane : Océanopolis (europole mer) 30-31 mars 2012: « La campagne PARISUB, Océan Pacifique, 2010, à bord de l?Atalante, avec le Nautile et l'Aster-X »

References of International Seminar Communications

Deschamps, A., B. Van Vliet-­?Lanoe, S. A. Soule, M. Le Saout, P. Allemand, and C. Delacourt (2013), Analysis of inflated submarine and sub-­?lacustrine Pahoehoe lava flows using high-­?resolution bathymetric and lidar data, Abstract V34C-­?01 presented at 2013 Fall Meeting, AGU, San Francisco, Calif., 9-­?13 Dec.

Tilot V, Moreno J. 2013. "Methodology for marine spatial management in deep seas", The Deep Sea Mining summit 2013, 31 July-1 August 2013, The Cumberland Hotel, London, UK.

Deschamps A., M. Le Saout, , S.A. Soule, P. Allemand, B. Van Vliet Lanoe, C. Delacourt, Submarine and aerial inflated lava flows, Geocean meeting, Brest (France), 2012.

Deschamps, A., S. A. Soule, M. Le Saout, P. Allemand, and C. Delacourt (2012), Analysis of inflated submarine and sub-­?lacustrine Pahoehoe lava flows using high-­?resolution bathymetric and lidar data, Abstract V21A-2754 presented at 2012 Fall Meeting, AGU, San Francisco, Calif., 3-7 Dec.

Le Saout M., A. Deschamps, S.A. Soule, P. Allemand, P. Gente, Lava flows morphologies at the intersection of the East-­?Pacific Rise with the Math ematician hot-spot, 16° N, Geocean meeting, Brest (France), 2012.

Le Saout, M., A. Deschamps, S. A. Soule, P. Allemand, and P. Gente (2012), Submarine inflated flows at the East Pacific Rise, 16°N, Abstract V21A-2756 presented at 2012 Fall Meeting, AGU, San Francisco, Calif., 3-7 Dec.

Mougel, B., A. Agranier, C. Hemond, M. Moreira and P. Gente (2012), Identification of an extremily unradiogenic lead component below the Est Pacific Rise (15°43'N), Abstract DI51A-2349, presented at 2012 Fall Meeting, AGU, San Francisco, Calif., 3-7 Dec.

Tilot V., 2012. "Assessment of the biodiversity and options for conservation and management: high seas and deep ocean ecosystems earmarked for mining". International Conference on Marine and Coastal Ecosystems (MarCoastEcos2012): increasing knowledge for a sustainable conservation and integrated management. Tirana, Albania, 25 ? 28 April 2012.

DESCHAMPS, A., AGRANIER, A., MOUGEL, B. & DYMENT, J., 2011 - Axial morphology of the East-Pacific Rise crest in the vicinity of its intersection with the Mathematician hot-spot: results of the PARISUB?2010 cruise, European Geosciences Union General Assembly, Vienne, 03-08/04.

Deschamps A., Allemand P., Delacourt C., M. Le Saout, P. Gente, Comparative study of volcanic landforms on Mars and on the East Pacific Rise using high-resolution AUV and HiRISE data, Abstract EGU2011-8545, PS10.0/GMPV28, presented at 2011 Fall Meeting, EGU, Vienna Austria, 3-8 Apr.

Deschamps A., Allemand P., M. Le Saout, Delacourt C., P. Gente, Axial morphology and lava emplacement at East-Pacific Rise at its intersection with the Mathematician hot-spot, 16°N, Abstract V53D-2648, presented at 2011 Fall Meeting, AGU, San Francisco, Calif., 5-9 Dec.

Mougel, B. Agranier, A., Hemond, C. and Gente, P. (2011) An unusual Hf-Pb signature below the EPR- Mathematician Hotspot system. Mineralogical Magazine, 75(3), 1507.

Tilot V., 2011. "Recommendations for the conservation and management of the biodiversity of deep sea ecosystems targeted by seabed mining (Polymetallic Nodule Deposits, Cobalt-Rich Ferromanganese Crusts and Hydrothermal Sulfides)". 40th annual conference of the Underwater Mining Institute, Hilo, Hawaii, 14-18 septembre, 2011.

DESCHAMPS, A., GENTE, P., DYMENT, J., AGRANIER, A., MAIA, M.A., HEMOND, C., BENOIT, M., SZITKAR, F., JANIN, M., THIBAUD, R., AGUILLON-ROBLES, A., RODRIGUEZ-LEON, L. & TILOT, V., 2010 ? Axial morphology of the East Pacific Rise crest at its intersection with the Mathematician hot-spot: results of the PARISUB 2010 cruise, American Geophysical Union Fall meeting, San Francisco, 13-17/12. DYMENT, J., DESCHAMPS, A., GENTE, P. & the PARISUB Scientific Party, 2010 - Complex dyke emplacement at the hyper-inflated EPR 16°N segment, American Geophysical Union Fall meeting, San Francisco, 13-17/12.

Deschamps A., Agranier A., Mougel B., M. Le Saout, P. Gente, Axial morphology of the East-Pacific Rise crest in the vicinity of its intersection with the Mathematician hot-spot: results of the PARISUB?2010 cruise, Abstract EGU2011-8515, TS5.1/GD4.4/GMPV35/SM2.9, presented at 2011 Fall Meeting, EGU, Vienna Austria, 3-8 Apr.

Tilot V., Gente P. and the Parisub scientific team, 2010. Discovery of new faunal sites on the EPR (16°N): abyssal, bathyal and hydrothermal communities, 12th Deep-sea Biology Symposium, Reykjavík, Iceland, 7-11 June 2010.

References of National Seminar Communications

Tilot V., 2013. « Protection des écosystèmes océaniques profonds dans le cadre de l?exploitation des ressources minières ». Réunion du groupe « Grands Fonds Marins » du Cluster Maritime français, 20 Juin 2013, Paris, France.

Tilot V., 2011. « Protection des écosystèmes océaniques profonds dans le cadre de l?exploitation des ressources minières ». 10ème session du Congrès français de la Nature-17 juin 2011.

Tilot V., 2010. 0rganisation d'une table ronde multidisciplinaire d'experts internationaux afin de dresser des « Recommandations sur la conservation et la gestion de la biodiversité au sein d'écosystèmes océaniques profonds dans le cadre de l'exploitation des ressources minières (nodules polymétalliques, encroûtements ferro-manganifères riches en cobalt et sulfures hydrothermaux) ». Table ronde multidisciplinaire composée d'experts internationaux et d'Académiciens des Sciences d'Outre-Mer organisée à l'Unesco le 15 Décembre, 2010.

DEA or MASTER 2 using campaign data

Le Saout Morgane : «Étude morpho-structurale du segment « 16°N » de l'EPR à partir de données ultra- haute résolution : chronologie relative et mise en place des laves», mémoire de Master 2, 2011.

Thesis using campaign data

Le Saout Morgane : « Interaction dorsale - point chaud : relations tectono-magmatiques à l'axe de la dorsale Est-Pacifique à 16°N », thèse de l'Université de Bretagne occidentale soutenue en mars 2015.

Mougel Bérengère, « Variabilité géochimique du manteau à petite échelle sous l'EPR (15°37'N - 15°47'N), Thèse de l'Université de Bretagne occidentale, soutenue en décembre 2013, Brest.