FN Archimer Export Format
PT J
TI Imaging exhumed lower continental crust in the distal Jequitinhonha basin, Brazil
BT 
AF LOUREIRO, Afonso
   SCHNURLE, Philippe
   KLINGELHOFER, F.
   AFILHADO, A.
   PINHEIRO, Joao Marcelo
   EVAIN, Mikael
   GALLAIS, Flora
   DIAS, N. A.
   RABINEAU, Marina
   BALTZER, Agnes
   BENABDELLOUAHED, Massinissa
   SOARES, J.
   FUCK, R.
   CUPERTINO, J. A.
   VIANA, A.
   MATIAS, L.
   MOULIN, Maryline
   ASLANIAN, Daniel
   VINICIUS APARECIDO GOMES DE LIMA, M.
AS 1:1;2:2;3:2;4:1,3;5:2;6:2;7:2;8:1,3;9:4;10:5;11:4;12:6;13:6;14:7;15:7;16:1;17:2;18:2;19:8;
FF 1:;2:PDG-REM-GM-LGS;3:;4:;5:PDG-REM-GM-LGS;6:PDG-REM-GM-LGS;7:PDG-REM-GM-LGS;8:;9:;10:PDG-REM-GM-LGG;11:PDG-REM-GM-LGS;12:;13:;14:;15:;16:;17:PDG-REM-GM-LGS;18:PDG-REM-GM-LGS;19:;
C1 Univ Lisbon, Inst Dom Luiz, Fac Ciencias, Campo Grande,Ed C1,Piso 1, P-1749016 Lisbon, Portugal.
   IFREMER, REM GM, Ctr Brest, F-29280 Plouzane, France.
   ISEL, Inst Politecn Lisboa, R Conselheiro Emidio Navarro, P-1959007 Lisbon, Portugal.
   Univ Bretagne Occidentale, Lab Geosci Ocean, UMR6538, Pl Nicolas Copern, F-29280 Plouzane, France.
   Univ Nantes, Geolittomer, LETG UMR CNRS 6554, Inst Geog & Amenagement Reg, Campus Tertre,BP 81227, F-44312 Nantes 3, France.
   Univ Brasilia, Inst Geociencias, Campus Darcy Ribeiro, BR-70910900 Brasilia, DF, Brazil.
   Petrobras SA, Cenpes Res Ctr, Rio De Janeiro, Brazil.
   Univ Fed Pampa, Dept Geofis, Campus Cacapava Sul, BR-96570000 Cappaya Do Sul, RS, Brazil.
C2 UNIV LISBON, PORTUGAL
   IFREMER, FRANCE
   ISEL, PORTUGAL
   UBO, FRANCE
   UNIV NANTES, FRANCE
   UNIV BRASILIA, BRAZIL
   PETROBRAS SA, BRAZIL
   UNIV FED PAMPA, BRAZIL
SI BREST
SE PDG-REM-GM-LGS
   PDG-REM-GM-LGG
UM LGO
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
   copubli-sud
IF 1.655
TC 16
UR https://archimer.ifremer.fr/doc/00428/53928/55054.pdf
LA English
DT Article
CR SALSA LEG1
   SALSA LEG2
BO L'Atalante
DE ;NE Brazil;South Atlantic Ocean;Passive margins;Wide-angle refraction seismic;PSDM;Crustal structure;Cretaceous breakup;Lower continental crust
AB Twelve combined wide-angle refraction and coincident multi-channel seismic profiles were acquired in the Jequitinhonha-Camamu-Almada, Jacuípe, and Sergipe-Alagoas basins, NE Brazil, during the SALSA experiment in 2014. Profiles SL11 and SL12 image the Jequitinhonha basin, perpendicularly to the coast, with 15 and 11 four-channel ocean-bottom seismometers, respectively. Profile SL10 runs parallel to the coast, crossing profiles SL11 and SL12, imaging the proximal Jequitinhonha and Almada basins with 17 ocean-bottom seismometers. Forward modelling, combined with pre-stack depth migration to increase the horizontal resolution of the velocity models, indicates that sediment thickness varies between 3.3 km and 6.2 km in the distal basin. Crustal thickness at the western edge of the profiles is of around 20 km, with velocity gradients indicating a continental origin. It decreases to less than 5 km in the distal basin, with high seismic velocities and gradients, not compatible with normal oceanic crust nor exhumed upper mantle. Typical oceanic crust is never imaged along these about 200 km-long profiles and we propose that the transitional crust in the Jequitinhonha basin is a made of exhumed lower continental crust. 
PY 2018
PD JUN
SO Journal Of South American Earth Sciences
SN 0895-9811
PU Pergamon-elsevier Science Ltd
VL 84
UT 000435049100025
BP 351
EP 372
DI 10.1016/j.jsames.2018.01.009
ID 53928
ER

EF