MD 171 / GEISEIR-1

Name: MD 171 / GEISEIR-1
Start: 2009-01-03
End: 2009-02-12
Location: Indian Ocean

Type	Oceanographic cruise
Ship	Marion Dufresne
Ship owner	TAAF
Dates	03/01/2009 - 12/02/2009
Chief scientist(s)	HEMOND Christophe
	GEO-OCEAN - UMR 6538 Univ. Brest, CNRS, Ifremer, Univ. Bretagne Sud Place Nicolas Copernic 29280 Plouzané https://www.geo-ocean.fr/
DOI	10.17600/9200050
Objective	The main objective was to characterize the variations in the upper mantle's compositions shown up by previous studies in this region. Using dense sampling, the aim is to provide statistical proof that the number of transitions between zones which are rich or poor in isotopes is compatible with a random distribution as would result from the recycling and delamination of the ocean crust. The secondary objectives are to understand the thermal structure of this ridge, which is special in that it has unstable structures resulting from the intermediate accretion rate.

Sea/Ocean

Indian Ocean

Ports

Port of departure : Le Port (Réunion)

Port of return : Le Port (Réunion)

Scientific Authority

LABORATOIRE GÉO-OCÉAN - UMR 6538

Technopôle Brest-Iroise

Rue Dumont d'Urville

29280 Plouzané

https://www-iuem.univ-brest.fr/lgo/fr

Discipline(s)

MARINE GEOSCIENCES

Code	Label	Quantity	PI
G01	Dredge Dragues axe dorsale SEIR	25 hauls	HEMOND Christophe
G03	Core rock Wax Core axe dorsale verres	120 cores	HEMOND Christophe
G27	Gravity measurements Axe dorsale : structure profonde	-	MAIA Marcia
G28	Magnetic measurements Axe dorsale : contrainte sur vitesse d'accrétion	-	DYMENT Jérôme
G74	Multi-beam echosounding Morphologie variable d'une dorsale à taux intermédiaire	-	BRIAIS Anne
H16	Transparency (eg transmissometer) MAPR pendant Wax Core	100 stations	HEMOND Christophe

Summary of measurements

-Closely spaced sampling of the south-eastern Indian ridge between 88 deg 40'E - 41 deg 50'S and 99 deg 20'E - 48 deg 20'S using a wax core (120) or dredging (25).
-Sampling at 3 nautical mile intervals on the south-east segment and at 6 nautical mile intervals along the north-west segment of the study zone (See map).
-Bathymetric, gravimetric and magnetic surveys transverse to the ridge all along the north-west segment to the Bruhnes-Matuyama reversal on either side of the ridge between 88 deg 40E - 41deg 50S and 95 deg 30'E - 45 deg S.
-Axial magnetic surveys along two segments between 88 deg 40'E - 41 deg 50'S and 95 deg 30'E - 45 deg S and between 46 deg 30'S - 96 deg E and 99 deg 20 ' E - 48 deg 20' S.

Location map

Published data

Sauter Daniel, Cannat Mathilde (2022). Gridded bathymetric data along the ultraslow spreading Southwest Indian Ridge between the Gallieni TF and the Rodrigues triple Junction. https://doi.org/10.17882/90631

Bibliography

Publications

Baker Edward T., Hemond Christophe, Briais Anne, Maia Marcia, Scheirer Daniel S., Walker Sharon L., Wang Tingting, Chen Yongshun John (2014). Correlated patterns in hydrothermal plume distribution and apparent magmatic budget along 2500 km of the Southeast Indian Ridge. Geochemistry Geophysics Geosystems, 15(8), 3198-3211. Publisher's official version : https://doi.org/10.1002/2014GC005344 , Open Access version : https://archimer.ifremer.fr/doc/00217/32849/

Graham David W., Hanan Barry B., Hemond Christophe, Blichert-Toft Janne, Albarede Francis (2014). Helium isotopic textures in Earth's upper mantle. Geochemistry Geophysics Geosystems, 15(5), 2048-2074. Publisher's official version : https://doi.org/10.1002/2014GC005264 , Open Access version : https://archimer.ifremer.fr/doc/00217/32839/

Hanan Barry B., Blichert-Toft Janne, Hemond Christophe, Sayit Kaan, Agranier Arnaud, Graham David W., Albarede Francis (2013). Pb and Hf isotope variations along the Southeast Indian Ridge and the dynamic distribution of MORB source domains in the upper mantle. Earth And Planetary Science Letters, 375, 196-208. https://doi.org/10.1016/j.epsl.2013.05.028

Janin M., Hemond Christophe, Maia Marcia, Nonnotte Philippe, Ponzevera Emmanuel , Johnson K. T. M. (2012). The Amsterdam-St. Paul Plateau: A complex hot spot/DUPAL-flavored MORB interaction. Geochemistry Geophysics Geosystems, 13(9), 1-26. Publisher's official version : https://doi.org/10.1029/2012GC004165 , Open Access version : https://archimer.ifremer.fr/doc/00102/21368/

Sloan Heather, Sauter Daniel, Goff John A., Cannat Mathilde (2012). Abyssal hill characterization at the ultraslow spreading Southwest Indian Ridge. Geochemistry Geophysics Geosystems, 13(1), Q0AE06-. Publisher's official version : https://doi.org/10.1029/2011GC003850 , Open Access version : https://archimer.ifremer.fr/doc/00266/37682/

Sauter Daniel, Sloan Heather, Cannat Mathilde, Goff John, Patriat Philippe, Schaming Marc, Roest Walter (2011). From slow to ultra-slow: How does spreading rate affect seafloor roughness and crustal thickness? GEOLOGY, 39(10), 911-914. https://doi.org/10.1130/G32028.1

Janin M., Hemond C., Guillou H., Maia M., Johnson K. T. M., Bollinger C., Liorzou C., Mudholkar A. (2011). Hot spot activity and tectonic settings near Amsterdam-St. Paul plateau (Indian Ocean). Journal Of Geophysical Research-solid Earth, 116(B05206), 1-17. Publisher's official version : https://doi.org/10.1029/2010JB007800 , Open Access version : https://archimer.ifremer.fr/doc/00213/32469/

References of Technical Reports

Dyment Jérôme, Lallier François, Le Bris Nadine, Rouxel Olivier , Sarradin Pierre-Marie , Lamare Sylvain, Coumert Coralie, Morineaux Marie, Tourolle Julie (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/

Rapport de mission MD 171 - IPEV

References of International Seminar Communications

D. W. Graham B. B. Hanan , C. Hémond , J. Blichert-Toft and F. Albarède, 2014, Helium Isotopic Textures in Earth?s Upper Mantle, Contribution to the 23th V.M. Goldschmidt? conférence, Sacramento.

B. Hanan, J. Blichert-Toft, K. Sayit, A. Agranier, C. Hémond, A. Briais, M. Maia, D. Graham, F. Albarede ; The Southeast Indian Ridge: Scale of Source Heterogeneity and Origin of the DUPAL Anomaly; Conférence Goldschmidt Montréal 2012.

Barry B Hanan, Janne Blichert-Toft, Kaan Sayit, Arnaud Agranier, Christophe Hémond, Anne Briais, Marcia Maia, David W. Graham, Francis Albarede ; The Southeast Indian Ridge: Scale of Source Heterogeneity and Origin of the DUPAL Anomaly ; AGU fall meeting San Francisco 2012.

Edward T Baker, Christophe Hémond, Anne Briais, Daniel S Scheirer, Tingting Wang, Yongshun John Chen ; Patterns Of Hydrothermal Plume Distribution And The Magmatic Budget Along 2500 Km Of The Southeast Indian Ridge, AGU fall meeting San Francisco 2012 ;

Anne Briais, Christophe Hémond, Marcia Maia, Barry Hanan, David Graham, and the GEISEIR and GEISEIR2 scientific teams ; Tectonics at the Southeast Indian Ridge 79 to 99 E. Results from the GEISEIR cruises ; AGU fall meeting San Francisco 2011.

B. Hanan, J. Blichert-Toft, C. Hemond, The Southeast Indian Ridge: Scale and Source Origin of Heterogeneity , InterRidge workshop on Circum Antarctic Ridges, Toulouse, 2011.

B. Hanan, J. Blichert-Toft, K. Sayit, A. Agranie, C. Hemond, A. Briais, M. Maia, D. Graham, F. Albarede ; A High- Resolution, Multi-Isotopic Study of Mantle Heterogeneity Beneath the Southeast Indian Ridge: Preliminary Pb and Hf Results ; Conférence Goldschmidt Prague 2011.

C. Hémond, A. Briais, D. Graham, B. Hanan, M. Maia, and the GEISEIR cruise scientific party ; The SEIR (denely) revisited between 88 and 99°E ; EGU Vienna, 2010.

Thesis using campaign data

Jabrane Labidi, Université Denis Diderot - Paris VII, Origine, dynamique et multi-compositions isotopiques du soufre dans le manteau terrestre, soutenue en 2012.

Matthieu Clog, Université Denis Diderot - Paris VII, Concentration et composition isotopique en hydrogène du manteau terrestre, soutenue en 2010.