FN Archimer Export Format
PT J
TI Extreme mantle uplift and exhumation along a transpressive transform fault
BT 
AF MAIA, Marcia
   SICHEL, Susanna
   BRIAIS, Anne
   BRUNELLI, Daniele
   LIGI, Marco
   FERREIRA, Nicolas
   CAMPOS, Thomas
   MOUGEL, Berengere
   BREHME, Isa
   HEMOND, Christophe
   MOTOKI, Akihisa
   MOURA, Denise
   SCALABRIN, Carla
   PESSANHA, Ivo
   ALVES, Eliane
   AYRES, Arthur
   OLIVEIRA, Pedro
AS 1:1;2:2;3:3;4:4,5;5:5;6:1;7:6;8:1,7;9:2;10:1;11:8;12:9;13:10;14:11;15:2;16:2;17:2;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:PDG-REM-GM-LCG;14:;15:;16:;17:;
C1 Univ Bretagne Occidentale, CNRS, IUEM, Lab Domaines Ocean, Rue Dumont dUrville, F-29280 Plouzane, France.
   Univ Fed Fluminense, LAGEMAR, Ave Gal Milton Tavares Souza S-N, BR-24210340 Niteroi, RJ, Brazil.
   Univ Toulouse, GET, Ave Edouard Belin, F-31400 Toulouse, France.
   Univ Modena & Reggio Emilia, Dipartimento Sci Chim & Geol, Via Campi 103, I-41125 Modena, Italy.
   CNR, Geol Marina, ISMAR, Via Gobetti 101, I-40129 Bologna, Italy.
   Univ Fed Rio Grande do Norte, Dept Geol, Cidade Univ Lagoa Nova,CP 1639, BR-59072700 Natal, RN, Brazil.
   Inst Phys Globe Paris, 1 Rue Jussieu, F-75005 Paris, France.
   Univ Estado Rio de Janeiro, Ctr Tecnol & Ciencias, Inst Geociencias, Rua Sao Francisco, BR-20550013 Rio De Janeiro, Brazil.
   Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Rua Matao 1226,Cidade Univ, BR-05508090 Sao Paulo, Brazil.
   IFREMER, Lab Acoust, Technopole Iroise, F-29280 Plouzane, France.
   Brazilian Geol Survey, CPRM, Ave Pasteur 404, BR-22290255 Rio De Janeiro, Brazil.
C2 UBO, FRANCE
   UNIV FED FLUMINENSE, BRAZIL
   UNIV TOULOUSE, FRANCE
   UNIV MODENA & REGGIO EMILIA, ITALY
   IAMC CNR, ITALY
   UNIV FED RIO GRANDE DO NORTE, BRAZIL
   IPGP, FRANCE
   UNIV ESTADO RIO DE JANEIRO, BRAZIL
   UNIV SAO PAULO, BRAZIL
   IFREMER, FRANCE
   BRAZILIAN GEOL SURVEY, BRAZIL
SI BREST
SE PDG-REM-GM-LCG
UM LGO
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
   copubli-sud
IF 13.941
TC 59
UR https://archimer.ifremer.fr/doc/00345/45603/49042.pdf
LA English
DT Article
CR COLMEIA
BO L'Atalante
AB Mantle exhumation at slow-spreading ridges is favoured by extensional tectonics through low-angle detachment faults1, 2, 3, 4, and, along transforms, by transtension due to changes in ridge/transform geometry5, 6. Less common, exhumation by compressive stresses has been proposed for the large-offset transforms of the equatorial Atlantic7, 8. Here we show, using high-resolution bathymetry, seismic and gravity data, that the northern transform fault of the St Paul system has been controlled by compressive deformation since ~10 million years ago. The long-lived transpression resulted from ridge overlap due to the propagation of the northern Mid-Atlantic Ridge segment into the transform domain, which induced the migration and segmentation of the transform fault creating restraining stepovers. An anticlockwise change in plate motion at ~11 million years ago5 initially favoured extension in the left-stepping transform, triggering the formation of a transverse ridge, later uplifted through transpression, forming the St Peter and St Paul islets. Enhanced melt supply at the ridge axis due to the nearby Sierra Leone thermo chemical anomaly9 is responsible for the robust response of the northern Mid-Atlantic Ridge segment to the kinematic change. The long-lived process at the origin of the compressive stresses is directly linked to the nature of the underlying mantle and not to a change in the far-field stress regime.
PY 2016
PD AUG
SO Nature Geoscience
SN 1752-0894
PU Nature Publishing Group
VL 9
IS 8
UT 000382137900020
BP 619
EP 624
DI 10.1038/NGEO2759
ID 45603
ER

EF