FN Archimer Export Format PT J TI Deep structure of the Santos Basin-São Paulo Plateau System, SE Brazil BT AF EVAIN, Mikael AFILHADO, A. RIGOTI, C. LOUREIRO, Afonso ALVES, D. KLINGELHOEFER, Frauke SCHNURLE, Philippe FELD, Aurelie FUCK, R. SOARES, J. DE LIMA, M. Vinicius CORELA, C. MATIAS, L. BENABDELLOUAHED, Massinissa BALTZER, Agnes RABINEAU, Marina VIANA, A. MOULIN, Maryline ASLANIAN, Daniel AS 1:1;2:1,2,3;3:4;4:2;5:2;6:1;7:1;8:1;9:5;10:5;11:6;12:2;13:2;14:1,7;15:1,8;16:7;17:4;18:1;19:1; FF 1:PDG-REM-GM-LGG;2:;3:;4:;5:;6:PDG-REM-GM-LGG;7:PDG-REM-GM-LGG;8:PDG-DGD-DMON-PF;9:;10:;11:;12:;13:;14:PDG-REM-GM-LGG;15:PDG-REM-GM-LGG;16:;17:;18:PDG-REM-GM-LGG;19:PDG-REM-GM-LGG; C1 IFREMER, Technopole Brest Iroise, Geosci Marines, Plouzane, France. Univ Lisbon, Fac Ciencias, Inst Dom Luis, P-1699 Lisbon, Portugal. Inst Super Engn Lisboa, Lisbon, Portugal. PROFEX, CENPES, PETROBRAS, Rio De Janeiro, Brazil. Univ Brasilia, Inst Geociencias, Lablithos, Brasilia, DF, Brazil. Univ Fed Pampa, Cacapava Do Sul, Brazil. CNRS, Inst Univ Europeen Mer, Domaines Ocean, Plouzane, France. Univ Nantes, LETG Nantes Geolittomer, Nantes, France. C2 IFREMER, FRANCE UNIV LISBON, PORTUGAL ISEL, PORTUGAL PETROBRAS, BRAZIL UNIV BRASILIA, BRAZIL UNIV FED PAMPA, BRAZIL CNRS, FRANCE UNIV NANTES, FRANCE SI BREST SE PDG-REM-GM-LGG PDG-DGD-DMON-PF UM LGO IN WOS Ifremer jusqu'en 2018 copubli-france copubli-europe copubli-univ-france copubli-int-hors-europe copubli-sud IF 3.318 TC 57 UR https://archimer.ifremer.fr/doc/00276/38715/37232.pdf LA English DT Article CR SANBA (SANTOS BASIN) LEG1 SANBA (SANTOS BASIN) LEG2 BO L'Atalante DE ;Santos Basin;SAo Paulo Plateau;crustal structure;wide-angle seismic AB The structure and nature of the crust underlying the Santos Basin-São Paulo Plateau System (SSPS), in the SE Brazilian margin, are discussed based on five wide-angle seismic profiles acquired during the Santos Basin (SanBa) experiment in 2011. Velocity models allow us to precisely divide the SSPS in six domains from unthinned continental crust (Domain CC) to normal oceanic crust (Domain OC). A seventh domain (Domain D), a triangular shape region in the SE of the SSPS, is discussed by Klingelhoefer et al. (2014). Beneath the continental shelf, a ~100 km wide necking zone (Domain N) is imaged where the continental crust thins abruptly from ~40 km to less than 15 km. Toward the ocean, most of the SSPS (Domains A and C) shows velocity ranges, velocity gradients, and a Moho interface characteristic of the thinned continental crust. The central domain (Domain B) has, however, a very heterogeneous structure. While its southwestern part still exhibits extremely thinned (7 km) continental crust, its northeastern part depicts a 2–4 km thick upper layer (6.0–6.5 km/s) overlying an anomalous velocity layer (7.0–7.8 km/s) and no evidence of a Moho interface. This structure is interpreted as atypical oceanic crust, exhumed lower crust, or upper continental crust intruded by mafic material, overlying either altered mantle in the first two cases or intruded lower continental crust in the last case. The deep structure and v-shaped segmentation of the SSPS confirm that an initial episode of rifting occurred there obliquely to the general opening direction of the South Atlantic Central Segment. PY 2015 PD AUG SO Journal Of Geophysical Research-solid Earth SN 0148-0227 PU Amer Geophysical Union VL 120 IS 8 UT 000362224100002 BP 5401 EP 5431 DI 10.1002/2014JB011561 ID 38715 ER EF