FN Archimer Export Format
PT J
TI Evolution of the Glorieuses seamount in the SW Indian Ocean and surrounding deep Somali Basin since the Cretaceous
BT 
AF Leroux, Estelle
   Counts, J.
   Jorry, Stephan
   Jouet, Gwenael
   Révillon, Sidonie
   BouDagher-Fadel, M.K.
   Courgeon, S.
   Berthod, C.
   Ruffet, G.
   Bachèlery, P.
   Grenard-Grand, E.
AS 1:1;2:2;3:1;4:1;5:3;6:4;7:1,5;8:6;9:7;10:6;11:1,8;
FF 1:PDG-REM-GM-LGS;2:;3:PDG-REM-GM-LGS;4:PDG-REM-GM-LGS;5:;6:;7:;8:;9:;10:;11:;
C1 IFREMER, Laboratoire Géodynamique et enregistrements Sédimentaires, BP70, 29280 Plouzané, France
   University College Dublin, School of Earth Sciences, Belfield, Dublin 4, Ireland
   SEDISOR, Place Nicolas Copernic, 19280 Plouzané, France
   University College London, Department of Earth Science, London, United Kingdom
   University of Genève, Department of Earth and Environmental Science, 13 Rue des Maraîchers, Geneva, Switzerland
   Université Clermont-Auvergne, UCA-OPGC, Laboratoire Magma et volcans, 4 Avenue Blaise Pascal, 63178 Aubière, cedex, France
   Université de Rennes 1, Géosciences-Rennes, UMR 6118, Campus Beaulieu, 35042 Rennes cedex, France
   Université de Caen-Normandie, UMR 6143 M2C morphodynamique continentale et côtière, 24, Rue des Tilleuls, 14000 Caen cedex, France
C2 IFREMER, FRANCE
   UNIV COLLEGE DUBLIN, IRELAND
   SEDISOR, FRANCE
   UNIV COLL LONDON, UK
   UNIV GENEVE, SWITZERLAND
   UNIV CLERMONT-AUVERGNE, FRANCE
   UNIV RENNES, FRANCE
   UNIV CAEN NORMANDIE, FRANCE
SI BREST
SE PDG-REM-GM-LGS
IN WOS Ifremer UPR
   copubli-france
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
IF 3.548
TC 15
UR https://archimer.ifremer.fr/doc/00628/73965/73324.pdf
LA English
DT Article
CR BIOMAGLO
   PAMELA-MOZ01
   PTOLEMEE
BO Antea
   L'Atalante
DE ;Glorieuses seamount;Somali Basin;Seismic stratigraphy;Tectonics;Vertical movement (uplift and subsidence);Volcanism;Shallow-water carbonate platform;Ar-40/Ar-39
AB Little is known about the geological history of the Glorieuses seamount including basic information about its age and origin related to the regional evolution of the southern tip of the Somali Basin. This study focused on describing and reconstructing the long-term stratigraphic evolution of the Glorieuses seamount (SW Indian Ocean) to identify the mechanisms that have occurred through time to finally shape the emerged modern islands. Distinct terrace levels, currently submerged along the flanks of the seamount and surrounding seamounts, have already been interpreted as resulting from successive carbonate development and back-stepping episodes over the last 62 Myr. New isotopic and biostratigraphic dating on the flanks of the seamount, coupled with sequence stratigraphic interpretation of seismic profiles acquired in the adjacent basin, provide new constraints for the Late Cretaceous and Cenozoic vertical evolution of the seamount topped by carbonate platforms and sedimentation in the surrounding deep basin. Even if starved steep slopes prevent a straightforward source-to-sink continuity between the platform and the basin domains, our findings propose a consistent chronostratigraphic framework for the identified seismic markers and sequences in the deep basin, and discuss a long-term geological model that includes the main driving factors behind deposition (volcanic events, subsidence vs uplift phases, climate and hydro-dynamism changes) and their quantitative impact on the evolution of the isolated carbonate sedimentary system. Our results show that: (i) the Glorieuses volcanic seamount emerged from two successive Late Cretaceous magmatic pulses, firstly during the Turonian, then during the Maastrichtian (ii) at least two potential uplift phases are recognized during the Tertiary (Paleogene and/or the Eocene and Tortonian); (iii) basinal sedimentation recorded an abrupt change probably related to major regional hydro-dynamical changes in Late Eocene times in the Western Indian Ocean; (iv) the export of sediments from the platform towards the basin (numerous gravity flow processes) is strongly enhanced after the Mid Miocene, and is probably linked to the onset of the Asian monsoon winds and bipolar circulation. Finally, the Glorieuses seamount, although located in the vicinity of the Comoros islands, appears to have a much longer history and is geologically more comparable to the nearby Seychelles. This long-term study has enabled us to associate the Glorieuses seamount with the SSE-NNW Madagascar-Seychelles alignment rather than with the Comoro hot spot evolution. 
PY 2020
PD SEP
SO Marine Geology
SN 0025-3227
PU Elsevier BV
VL 427
UT 000552135700002
DI 10.1016/j.margeo.2020.106202
ID 73965
ER

EF