FN Archimer Export Format
PT J
TI Paleogeographic evolution of the central segment of the South Atlantic during Early Cretaceous times: Paleotopographic and geodynamic implications
BT 
AF CHABOUREAU, Anne-Claire
   GUILLOCHEAU, Francois
   ROBIN, Cecile
   ROHAIS, Sebastien
   MOULIN, Maryline
   ASLANIAN, Daniel
AS 1:1,2;2:1;3:1;4:2;5:3;6:4;
FF 1:;2:;3:;4:;5:;6:PDG-REM-GM-LGG;
C1 Univ Rennes 1, CNRS, Geosci Rennes UMR6118, F-35042 Rennes, France.
   IFP Energies Nouvelles, F-92852 Rueil Malmaison, France.
   Univ Lisbon, Fac Ciencias, IDL, P-1749016 Lisbon, Portugal.
   IFREMER, Dept Marine Geosci, F-29280 Plouzane, France.
C2 UNIV RENNES, FRANCE
   IFP, FRANCE
   UNIV LISBON, PORTUGAL
   IFREMER, FRANCE
SI BREST
SE PDG-REM-GM-LGG
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-europe
   copubli-univ-france
IF 2.866
TC 96
UR https://archimer.ifremer.fr/doc/00149/26057/88184.pdf
LA English
DT Article
CR ZAIANGOSMT
BO Le Nadir
DE ;South Atlantic Ocean - central segment;Rift;Early Cretaceous;Paleogeography;Geodynamic
AB The geodynamic processes that control the opening of the central segment of the South Atlantic Ocean (between the Walvis Ridge and the Ascension FZ) are debated. In this paper, we discuss the timing of the sedimentary and tectonic evolution of the Early Cretaceous rift by drawing eight paleogeographic and geodynamic maps from the Berriasian to the Middle–Late Aptian, based on a biostratigraphic (ostracodes and pollen) chart recalibrated on absolute ages (chemostratigraphy, interstratified volcanics, Re–Os dating of the organic matter).  The central segment of the South Atlantic is composed of two domains, with a two phases evolution of the pre-drift (“rifting”) times: a rift phase characterized by tilted blocks and growth strata, followed by a sag basin. The southern domain includes the Namibe, Santos and Campos Basins. The northern domain extends from the Espirito Santo and North Kwanza Basins, in the south, to the Sergipe–Alagoas and North Gabon Basins to the north.  Extension started in the northern domain during the Late Berriasian (Congo–Camamu Basin to the Sergipe–Alagoas–North Gabon Basins) and migrated southward. At that time, the southern domain was not a subsiding domain (emplacement of the Parana–Etendeka Trapp). Extension started in this southern domain during the Early Barremian. The rift phase is shorter in the south (5–6 Ma, Barremian to base Aptian) than in the north (19 to 20 Myr, Upper Berriasian to base Aptian). The sag phase is of Middle to Late Aptian age. In the northern domain, this transition corresponds to a hiatus of Early to Middle Aptian age.  From the Late Berriasian to base Aptian, the northern domain evolves from a deep lake with lateral highs to a shallower organic-rich one with no more highs. The lake migrates southward in two steps, until the Valanginian at the border between the northern and southern domains, until the Early Barremian, north of Walvis Ridge.
PY 2013
PD SEP
SO Tectonophysics
SN 0040-1951
PU Elsevier Science Bv
VL 604
UT 000325839900014
BP 191
EP 223
DI 10.1016/j.tecto.2012.08.025
ID 26057
ER

EF