Genetic relations between the Aves Ridge and the Grenada back‐arc Basin, East Caribbean Sea

Type Article
Date 2021-02
Language English
Author(s) Garrocq ClémentORCID1, Lallemand SergeORCID1, Marcaillou BorisORCID2, Lebrun Jean‐frédéricORCID3, Padron CreliaORCID4, 5, Klingelhoefer FraukeORCID5, Laigle Mireille2, Münch PhilippeORCID1, Gay Aurelien1, Schenini Laure2, Beslier Marie‐odile2, Cornée Jean‐jacques1, Mercier De Lépinay BernardORCID2, Quillévéré Frédéric6, Boudagher‐fadel MarcelleORCID7
Affiliation(s) 1 : Géosciences Montpellier CNRS Université de Montpellier Université des Antilles Place Eugène Bataillon 34095, Montpellier, France
2 : GéoazurUniversité Côte d'AzurCNRS IRD Observatoire de la Côte d'Azur Géoazur 250 Avenue Albert Einstein 06560 Valbonne, France
3 : Géosciences Montpellier Université des Antilles CNRS Université de MontpellierCampus de FouillolePointe‐à‐Pitre, Guadeloupe, France
4 : Departamento de Ciencias de la Tierra Universidad Simón Bolívar (USB )Caracas, Venezuela
5 : Géosciences Marines, Ifremer ZI de la Pointe du Diable CS 1007029280 Plouzané, France
6 : Université de Lyon, Université Claude Bernard Lyon 1LGLTPECNRSBd du 11 Novembre 191869622 Villeurbanne, France
7 : Office of the Vice‐Provost (research), University College London, 2 Taviton street, London, WC1h 0BT, UK
Source Journal Of Geophysical Research-solid Earth (2169-9313) (American Geophysical Union), 2021-02 , Vol. 126 , N. 2 , P. e2020JB020466 (29p.)
DOI 10.1029/2020JB020466
WOS© Times Cited 1
Keyword(s) Grenada Basin, Aves Ridge, back-arc basin, seismic reflection, Caribbean
Abstract

The Grenada Basin separates the active Lesser Antilles Arc from the Aves Ridge, described as a Cretaceous‐Paleocene remnant of the ‘Great Arc of the Caribbean'. Although various tectonic models have been proposed for the opening of the Grenada Basin, the data on which they rely are insufficient to reach definitive conclusions. This paper presents a large set of deep‐penetrating multichannel seismic reflection data and dredge samples acquired during the GARANTI cruise in 2017. By combining them with published data including seismic reflection data, wide‐angle seismic data, well data and dredges, we refine the understanding of the basement structure, depositional history, tectonic deformation and vertical motions of the Grenada Basin and its margins as follows: 1) rifting occurred during the late Paleocene‐early Eocene in a NW‐SE direction and led to seafloor spreading during the middle Eocene; 2) this newly formed oceanic crust now extends across the eastern Grenada Basin between the latitude of Grenada and Martinique; 3) asymmetrical pre‐Miocene depocenters support the hypothesis that the southern Grenada Basin originally extended beneath the present‐day southern Lesser Antilles Arc and probably partly into the present‐day forearc before the late Oligocene‐Miocene rise of the Lesser Antilles Arc; 4) the Aves Ridge has subsided along with the Grenada Basin since at least the middle Eocene, with a general subsidence slowdown or even an uplift during the late Oligocene, and a sharp acceleration on its southeastern flank during the late Miocene. Until this acceleration of subsidence, several bathymetric highs remained shallow enough to develop carbonate platforms.

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Garrocq Clément, Lallemand Serge, Marcaillou Boris, Lebrun Jean‐frédéric, Padron Crelia, Klingelhoefer Frauke, Laigle Mireille, Münch Philippe, Gay Aurelien, Schenini Laure, Beslier Marie‐odile, Cornée Jean‐jacques, Mercier De Lépinay Bernard, Quillévéré Frédéric, Boudagher‐fadel Marcelle (2021). Genetic relations between the Aves Ridge and the Grenada back‐arc Basin, East Caribbean Sea. Journal Of Geophysical Research-solid Earth, 126(2), e2020JB020466 (29p.). Publisher's official version : https://doi.org/10.1029/2020JB020466 , Open Access version : https://archimer.ifremer.fr/doc/00665/77704/