FN Archimer Export Format
PT J
TI Neogene evolution and demise of the Amapá carbonate platform, Amazon continental margin, Brazil
BT 
AF Cruz, A.M.
   Reis, A.T.
   Suc, J.P.
   Silva, C.G.
   Praeg, D.
   Granjeon, D.
   RABINEAU, Marina
   Popescu, S.M.
   Gorini, C.
AS 1:1;2:2;3:1;4:3;5:3,4,5;6:6;7:7;8:8;9:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;
C1 Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre Paris, ISTeP UMR 7193, 75005, Paris, France
   Department of Geological Oceanography, School of Oceanography, Rio de Janeiro State University (UERJ), Rua São Francisco Xavier, 524, 4° Andar, Bl. E, Maracanã, Rio de Janeiro/RJ, CEP: 20.550-013, Brazil
   Departamento de Geologia-Lagemar, Universidade Federal Fluminense (UFF), Av. Litorânea, s/n, Boa Viagem, Niterói, RJ, CEP: 24210-346, Brazil
   Institute of Petroleum and Natural Resources, Pontifícia Universidade Católica do Rio Grande do Sul – PUCRS, Av. Ipiranga, 6681, Porto Alegre, Brazil
   Géoazur, UMR7329 CNRS, 250 Rue Albert Einstein, 06560, Valbonne, France
   IFP Energies Nouvelles, 1-4 avenue de Bois-Préau, 92852, Rueil-Malmaison, France
   CNRS, UMR6538 (Univ Brest, CNRS, UBS) Laboratoire Géosciences Océan, 1, Place Nicolas Copernic, F-29280, Plouzane, France
   GeoBioStratData Consulting. 385 Route du Mas Rillier, 69140, Rillieux la Pape, France
C2 UNIV PARIS 06, FRANCE
   UNIV RIO DE JANEIRO, BRAZIL
   UNIV FED FLUMINENSE UFF, BRAZIL
   UNIV CATOLIC RIO GRANDE DO SUL, BRAZIL
   CNRS, FRANCE
   IFP ENERGIES NOUVELLES, FRANCE
   CNRS, FRANCE
   GEOBIOSTRATDATA CONSULTING., FRANCE
UM LGO
IF 3.79
TC 12
UR https://archimer.ifremer.fr/doc/00489/60066/63351.pdf
LA English
DT Article
DE ;Mixed carbonate-siliciclastic platform;Carbonate architecture;Chonostratigraphic model;Non-eustatic accommodation;Shelf paleogeography
AB The Amazon continental shelf hosted one of the world's largest mixed carbonate-siliciclastic platforms from the late Paleocene onwards - the Amapá carbonates. The platform architecture, however, remains poorly understood and causes and timing of the cessation of carbonate deposition are still controversial. Here we present a stratigraphic analysis of the Neogene succession of the Amapá carbonates, based on a grid of 2D/3D seismic data correlated to revised micropaleontological data from exploration wells. The results provide improved constraints on the age of the transition from predominantly carbonate to siliciclastic sedimentation, which is shown to have varied through time across three different sectors of the shelf (NW, Central and SE). Four Neogene evolutionary stages of carbonate deposition could be defined and dated with reference to the new age model: (1) between ca. 24 and 8 Ma a predominantly aggrading mixed carbonate-siliciclastic shelf prevailed across the entire region carbonate production gave way to siliciclastic sedimentation across the Central and SE shelves; (2) between 8 and 5.5 Ma carbonate production continued to dominate the NW shelf, as deposition was able to keep up with base level oscillations; (3) between 5.5 and 3.7 Ma (early Pliocene), sediment supply from the paleo-Amazon River promoted the progressive burial of carbonates on the inner NW shelf, while carbonates production continued on the outer shelf (until 3.7 Ma). Longer-lasting carbonate sedimentation on the NW shelf can be explained by a lesser influx of siliciclastic sediments due to the paleo-geography of the Central shelf, characterized by a 150-km-wide embayment, which directed most terrigenous sediments sourced from the paleo-Amazon River to the continental slope and deep ocean; (4) from 3.7 Ma onwards, when the Central shelf embayment became completely filled, continuous sediment supply to the NW shelf resulted in the final transition from carbonate to siliciclastic-dominated environments on the entire Offshore Amazon Basin. 
PY 2019
PD JUN
SO Marine And Petroleum Geology
SN 0264-8172
PU Elsevier BV
VL 105
UT 000469896400012
BP 185
EP 203
DI 10.1016/j.marpetgeo.2019.04.009
ID 60066
ER

EF