From platform top to adjacent deep sea: New source-to-sink insights into carbonate sediment production and transfer in the SW Indian Ocean (Glorieuses archipelago)

Type Article
Date 2020-05
Language English
Author(s) Jorry StephanORCID1, Jouet Gwenael1, Edinger Evan N.2, Toucanne SamuelORCID1, Counts John W.3, Miramontes Elda4, Courgeon Simon5, Riveiros Natalia Vázquez1, Le Roy Pascal6, Camoin Gilbert F.7
Affiliation(s) 1 : Ifremer, Unité Géosciences Marines, Technopôle la Pointe du Diable, 29280 Plouzané, France
2 : Memorial University, Departments of Geography and Biology, St. Johns, Newfoundland, Canada
3 : University of College Dublin, School of Earth Sciences, Belfield, Dublin 4, Ireland
4 : University of Bremen, Bibliothekstraße 1, 28359 Bremen, Germany
5 : University of Geneva, Department of Earth Sciences, 13 rue des Maraîchers, 1205 Geneva, Switzerland
6 : Université de Brest, CNRS, IUEM, UMR 6538 Géosciences Océan, 29290 Plouzané, France
7 : Aix Marseille Université, CNRS, IRD, Collège de France, CEREGE, Technopôle Environnement, Arbois-Méditerranée BP80, 13545 Aix en Provence, France
Source Marine Geology (0025-3227) (Elsevier BV), 2020-05 , Vol. 423 , P. 106144 (18p.)
DOI 10.1016/j.margeo.2020.106144
WOS© Times Cited 7
Keyword(s) Carbonate platform, Coral reef, Calciturbidite, Aragonite, Carbonate budget, Indian Ocean
Abstract

Over the past ten years, a huge amount of source-to-sink studies have aimed to unravel the tectonic, climatic and other processes that shape the landscape from mountains to the deep ocean. Interestingly, these studies have been mainly dedicated to siliciclastic or mixed systems, for which the connection between drainage basins, continental shelves, slope and basin environments are often well constrained. Here we present a study focusing on a source-to-sink study dedicated to a pure carbonate system, located in the SW Indian Ocean (Glorieuses archipelago). Extensive field sampling and geophysical acquisition across the carbonate platform have allowed us to estimate the composition, the lateral variability, and volumes of neritic sands deposited on the platform top. Additional seismic and bathymetric surveys across the platform interior illustrate the presence of plurimetric sandy bodies deposited along the leeward platform edge, corresponding to the export of carbonate sediments from the platform top toward the platform edge, under the influence of dominant currents and wind-driven processes. High-resolution seismic, bathymetric data and sediment cores acquired along the leeward slope and basin adjacent to the carbonate platform highlight the presence of channel-levee complexes and turbiditic lobes, which have accumulated on the seafloor on top of a 250 m-thick sedimentary basin at 2000–3400 m water depth. Our study points out that carbonate sands and aragonitic mud produced on the platform top during the Holocene have been shed to the adjacent basin. We also demonstrate that this routing system was active at least throughout the last three glacial/interglacial cycles. This study has important consequences for our understanding of carbonate sedimentation processes occurring in the vicinity of isolated carbonate platforms: 1 - it highlights the role of oceanographic conditions in the distribution of sediment on a platform top and its export along the platform edge and the adjacent basin; 2 - it contributes to quantify the productivity of a carbonate platform as well as its sediment storage capacity; 3 - a first estimate of a carbonate source-to-sink system is proposed, demonstrating that 0,57 km3 of sediments have been produced during the Holocene, 0,3 km3 being presently stored on the platform, and the remaining having been exported to the deep basin.

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Jorry Stephan, Jouet Gwenael, Edinger Evan N., Toucanne Samuel, Counts John W., Miramontes Elda, Courgeon Simon, Riveiros Natalia Vázquez, Le Roy Pascal, Camoin Gilbert F. (2020). From platform top to adjacent deep sea: New source-to-sink insights into carbonate sediment production and transfer in the SW Indian Ocean (Glorieuses archipelago). Marine Geology, 423, 106144 (18p.). Publisher's official version : https://doi.org/10.1016/j.margeo.2020.106144 , Open Access version : https://archimer.ifremer.fr/doc/00607/71879/