FN Archimer Export Format
PT J
TI Continuous exhumation of mantle-derived rocks at the Southwest Indian Ridge for 11 million years
BT 
AF SAUTER, Daniel
   CANNAT, Mathilde
   ROUMEJON, Stephane
   ANDREANI, Muriel
   BIROT, Dominique
   BRONNER, Adrien
   BRUNELLI, Daniele
   CARLUT, Julie
   DELACOUR, Adelie
   GUYADER, Vivien
   MACLEOD, Christopher J.
   MANATSCHAL, Gianreto
   MENDEL, Veronique
   MENEZ, Benedicte
   PASINI, Valerio
   RUELLAN, Etienne
   SEARLE, Roger
AS 1:1;2:2;3:2;4:3,4;5:5;6:1;7:6;8:2;9:6;10:5;11:8;12:1;13:1;14:2;15:2,6;16:9;17:10;
FF 1:;2:;3:;4:;5:PDG-REM-GM-LGM;6:;7:;8:;9:;10:PDG-REM-GM-LGM;11:;12:;13:;14:;15:;16:;17:;
C1 Univ Strasbourg, Inst Phys Globe Strasbourg, UMR CNRS 7516, F-67084 Strasbourg, France.
   Univ Paris Diderot, Inst Phys Globe Paris, Equipe Geosci Marines, Sorbonne Paris Cite,UMR CNRS 7154, F-75005 Paris, France.
   ENS, Lab Sci Terre, F-69622 Villeurbanne, France.
   Univ Lyon, F-69622 Villeurbanne, France.
   IFREMER, Ctr Brest, Dept Geosci Marines, Lab Geochim Metallogenie, F-29280 Plouzane, France.
   Univ Modena & Reggio Emilia, Dipartimento Sci Terra, I-41100 Modena, Italy.
   Univ St Etienne, Dept Geol, UMR CNRS 6524, F-42023 St Etienne 2, France.
   Cardiff Univ, Sch Earth & Ocean Sci, Cardiff CF10 3YE, S Glam, Wales.
   OCA UNS GeoAzur, UMR CNRS 7329, F-06560 Valbonne, France.
   Univ Durham, Dept Earth Sci, Durham DH1 3LE, England.
C2 UNIV STRASBOURG, FRANCE
   UNIV PARIS 07, FRANCE
   ENS, FRANCE
   UNIV LYON, FRANCE
   IFREMER, FRANCE
   UNIV MODENA & REGGIO EMILIA, ITALY
   UNIV ST ETIENNE, FRANCE
   UNIV CARDIFF, UK
   UNIV NICE, FRANCE
   UNIV DURHAM, UK
SI BREST
SE PDG-REM-GM-LGM
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-europe
   copubli-univ-france
IF 11.668
TC 206
UR https://archimer.ifremer.fr/doc/00136/24771/22854.pdf
   https://archimer.ifremer.fr/doc/00136/24771/22950.pdf
LA English
DT Article
CR EDUL-MD107
   MD 183 / SMOOTHSEAFLOOR
BO Marion Dufresne
AB The global mid-ocean ridge system, where tectonic plates diverge, is traditionally thought of as the largest single volcanic feature on the Earth. Yet, wide expanses of smooth sea floor in the easternmost part of the Southwest Indian Ridge in the Indian Ocean lacks the hummocky morphology that is typical for submarine volcanism. At other slow-spreading ridges, the sea floor can extend by faulting the existing lithosphere, along only one side of the ridge axis. However, the smooth sea floor in the easternmost Southwest Indian Ridge also lacks the corrugated texture created by such faulting. Instead, the sea floor is smooth on both sides of the ridge axis and is thought to be composed of altered mantle-derived rocks. Here we use side-scan sonar to image the sea floor and dredge samples to analyse the composition of two sections of the Southwest Indian Ridge, between 62 degrees 05'E and 64 degrees 40'E, where the sea floor formed over the past 11 million years. We show that the smooth floor is almost entirely composed of seawater-altered mantle-derived rocks that were brought to the surface by large detachment faults on both sides of the ridge axis. Faulting accommodates almost 100% of plate divergence and the detachment faults have repeatedly flipped polarity. We suggest that this tectonic process could also explain the exhumation of mantle-derived rocks at the magma-poor margins of rifted continents.
PY 2013
PD APR
SO Nature Geoscience
SN 1752-0894
PU Nature Publishing Group
VL 6
IS 4
UT 000316946500022
BP 314
EP 320
DI 10.1038/NGEO1771
ID 24771
ER

EF