FN Archimer Export Format
PT J
TI Fluid-assisted grain size reduction leads to strain localization in oceanic transform faults
BT 
AF Bickert, Manon
   Kaczmarek, Mary-Alix
   Brunelli, Daniele
   Maia, Marcia
   Campos, Thomas F. C.
   Sichel, Susanna E.
AS 1:1,2;2:3;3:2,4;4:7;5:5;6:6;
FF 1:PDG-REM-GEOOCEAN-CYBER;2:;3:;4:;5:;6:;
C1 Geo-Ocean, Univ Brest, CNRS, IFREMER, UMR6538, F-29280, Plouzané, France
   Dipartimento di Scienze Chimiche e Geologiche, Università di Modena e Reggio Emilia, Modena, Italy
   Géosciences Environnement Toulouse (GET), CNRS-CNES-IRD-Université Toulouse III, Observatoire Midi Pyrénées, 14 avenue E. Belin, 31400, Toulouse, France
   IGAG-CNR, Istituto di Geologia Ambientale e Geoingegneria, Rome, Italy
   Department of Geology, Rio Grande do Norte Federal University, Natal, Rio Grande do Norte, Brazil
   Department of Geology and Geophysics, Federal Fluminense University, Niteroi, Rio de Janeiro, Brazil
   Geo-Ocean, Univ Brest, CNRS, IFREMER, UMR6538, F-29280, Plouzané, France
C2 IFREMER, FRANCE
   UNIV MODENA & REGGIO EMILIA, ITALY
   OBSERV MIDI PYRENEES, FRANCE
   IGAG CNR, ITALY
   UNIV FED RIO GRANDE DO NORTE, BRAZIL
   UNIV FED FLUMINENSE, BRAZIL
   CNRS, FRANCE
SI BREST
SE PDG-REM-GEOOCEAN-CYBER
UM GEO-OCEAN
IN WOS Ifremer UMR
   WOS Cotutelle UMR
   DOAJ
   copubli-france
   copubli-europe
   copubli-int-hors-europe
   copubli-sud
IF 16.6
TC 0
UR https://archimer.ifremer.fr/doc/00846/95797/103645.pdf
   https://archimer.ifremer.fr/doc/00846/95797/103646.pdf
   https://archimer.ifremer.fr/doc/00846/95797/103647.pdf
   https://archimer.ifremer.fr/doc/00846/95797/103648.xlsx
LA English
DT Article
CR COLMEIA
BO L'Atalante
AB Oceanic Transform Faults are major plate boundaries representing the most seismogenic part of the mid ocean ridge system. Nonetheless, their structure and deformation mechanisms at depth are largely unknown due to rare exposures of deep sections. Here we study the mineral fabric of deformed mantle peridotites - ultramafic mylonites - collected from the transpressive Atobá ridge, along the northern fault of the St. Paul transform system in the Equatorial Atlantic Ocean. We show that, at pressure and temperature conditions of the lower oceanic lithosphere, the dominant deformation mechanism is fluid-assisted dissolution-precipitation creep. Grain size reduction during deformation is enhanced by dissolution of coarser pyroxene grains in presence of fluid and contextual precipitation of small interstitial ones, leading to strain localization at lower stresses than dislocation creep. This mechanism potentially represents the dominant weakening factor in the oceanic lithosphere and a main driver for the onset and maintenance of oceanic transform faults. 
PY 2023
PD JUN
SO Nature Communications
SN 2041-1723
PU Springer Science and Business Media LLC
VL 14
IS 1
UT 001027089000007
DI 10.1038/s41467-023-39556-5
ID 95797
ER

EF