MAGOFOND2-MD112

Name: MAGOFOND2-MD112
Start: 1998-10-11
End: 1998-11-09
Location: Indian Ocean

Type	Oceanographic cruise
Set	This cruise is part of the set MAGOFOND
Ship	Marion Dufresne
Ship owner	TAAF
Dates	11/10/1998 - 09/11/1998
Chief scientist(s)	DYMENT Jérôme , GALLET Yves
	INSTITUT DE PHYSIQUE DU GLOBE DE PARIS - UMR 7154, UMS 3454 1 rue Jussieu 75005 Paris +33 (0)1 83 95 74 00 https://www.ipgp.fr/
DOI	10.17600/98200050
Objective	Bathymetric and geophysical survey of the central Indian ridge at 19 deg S. Bathymetric and geophysical survey of the change in spreading direction at 40-45 Ma on the central Indian ridge (African flank) and the Mauritius Fossil Ridge. High resolution magnetic profiles on anomalies 1 to 2A on the central Indian Ridge. High resolution magnetic profiles cutting across the Mauritius Fossil Ridge (anomalies 21 to 22r). The related programmes are Dorsales, InteRidge. The participating organizations were: -IFRTP French polar research institute, Plouzané -CNRS UMR 6538, European university Institute, University Western Brittany (UBO) Plouzané -CNRS UMR 7577, IPGP Institute of earth physics, Paris -LEGOS, University Paul Sabatier, Toulouse -Ocean Research Institute, University of Tokyo, Tokyo, Japon -National Geophysical Research Institute, Hyderabad, India -National Institute of Oceanography, Goa, India

Sea/Ocean

Indian Ocean

(Dorsale centrale indienne)

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

Participating bodie(s)

IFRTP - Plouzane,CNRS UMR 6538-IUEM Plouzane,CNRS UMR 7577-IPG Paris,LEGOS Univ Toulouse, ORI Tokyo, NGRI-Inde, NIO-Inde

Discipline(s)

MARINE GEOSCIENCES

Code	Label	Quantity	PI
G01	Dredge dragues TAAF rectangulaires	-	DYMENT Jérôme
G24	Long to short range side scan sonar sondeur TSM 5265	-	DYMENT Jérôme
G27	Gravity measurements gravimetrie Lacoste & Romberg, en continu	-	DYMENT Jérôme
G28	Magnetic measurements magnetometre Geometrics scalaire a precession protonique,tracte a 350m	-	DYMENT Jérôme
G72	Geophysical meas. made at depth magnetometre scalaire deep tow ORI, 6 profils	6 profiles	DYMENT Jérôme
G74	Multi-beam echosounding sondeur TSM 5265, en continu	-	DYMENT Jérôme
G90	Other geosciences meas. magnetometre vectoriel de bord de l'ORI, en continu	-	DYMENT Jérôme
H13	Bathythermograph sondes Sippican (pour correction de celerite du sondeur multifaisceaux	6 profiles	DYMENT Jérôme

Summary of measurements

-Multibeam bathymetry and imaging (Thomson Marconi echosounder TSM 5265 sonar); during entire cruise.
-Gravimetry (Lacoste Romberg gravimeter, rattachement à using a Scintrex land gravimeter); during entire cruise.
-Magnetism (Geometrics surface scalar magnetometer, towed 350 m from vessel); during most of the cruise (except while dredging).
-Magnetism (shipboard vector magnetometer of the Ocean Research Institute, University of Tokyo); during the last two thirds of the cruise, from 24/10/98 on.
-Bottom magnetism (bottom magnetometer of the Ocean Research Institute, University of Tokyo); on six specific profiles (acquisition speed: 2.5 knots).
-BT probes (for velocity profiles and correction of multibeam bathymetry: Sippican); six times(?).
-Dredging (rectangular TAAF dredges); three attempts, two of them successful (basalts, sediments) and one lost.

Location map

Bibliography

Publications

Fueri Evelyn, Hilton David R., Murton Bramley J., Hemond Christophe, Dyment Jerome, Day James M. D. (2011). Helium isotope variations between Reunion Island and the Central Indian Ridge (17 degrees-21 degrees S): New evidence for ridge-hot spot interaction. Journal Of Geophysical Research-solid Earth, 116(B02207), 1-17. https://doi.org/10.1029/2010JB007609

Nauret F., Abouchami W., Galer S. J. G., Hofmann A. W., Hemond C, Chauvel C, Dyment J (2006). Correlated trace element-Pb isotope enrichments in Indian MORB along 18-20 circle S, Central Indian Ridge. Earth And Planetary Science Letters, 245(1-2), 137-152. https://doi.org/10.1016/j.epsl.2006.03.015

Pouliquen G, Sailhac P (2003). Wavelet analysis of deep-tow magnetic profiles: Modeling the magnetic layer thickness over oceanic ridges. Journal Of Geophysical Research-solid Earth, 108(B6), 3.1-3.19. Publisher's official version : https://doi.org/10.1029/2001JB001459 , Open Access version : https://archimer.ifremer.fr/doc/00224/33551/

Pouliquen G, Gallet Y, Dyment J, Patriat P, Tamura C (2001). Correction to “A geomagnetic record over the last 3.5 million years from deep-tow magnetic anomaly profiles across the Central Indian Ridge” by Gaud Pouliquen, Yves Gallet, Jérôme Dyment, Philippe Patriat, and Chiori Tamura. Journal Of Geophysical Research-solid Earth, 106(B12), 30549-30549. Publisher's official version : https://doi.org/10.1029/2001JB001637 , Open Access version : https://archimer.ifremer.fr/doc/00223/33379/

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/

Thesis using campaign data

Ingale Vaibhav Vijay (2023). Dynamics of seafloor spreading from hydroacoustic analyses of seismic swarms along the three Indian Ocean ridges. PhD Thesis, Université de Bretagne Occidentale.