globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2020.228645
论文题名:
Deep structure of the Demerara Plateau: From a volcanic margin to a Transform Marginal Plateau
作者: Museur T.; Graindorge D.; Klingelhoefer F.; Roest W.R.; Basile C.; Loncke L.; Sapin F.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 803
语种: 英语
英文关键词: Offshore oil well production ; Seismic waves ; Seismology ; Structural geology ; Tectonics ; Velocity ; Volcanoes ; Continental crusts ; Crustal structure ; Large igneous provinces ; Magmatic materials ; Seismic reflections ; Seismic velocity models ; Thermal anomalies ; Velocity gradients ; Volcanic rocks ; crustal structure ; Jurassic ; plateau ; seismic reflection ; seismic velocity ; structural geology ; tectonics ; Atlantic Ocean ; Atlantic Ocean (Central) ; Atlantic Ocean (Equatorial) ; French Guiana ; Suriname
英文摘要: The Demerara Plateau (offshore Suriname and French Guiana) is located at the junction of the Jurassic Central Atlantic and the Cretaceous Equatorial Atlantic Oceans. The study of its crustal structure is fundamental to understanding its tectonic history, its relationship with the adjacent oceanic domains and to enlightening the formation of Transform Marginal Plateaus (TMPs). This study presents two wide-angle seismic velocity models from the MARGATS cruise seismic experiment, and adjacent composite seismic reflection lines. The plateau itself is characterized by a 30 km thick crust, subdivided into three layers, including a high velocity lower crust (HVLC). The velocities and velocity gradients do not fit values of typical continental crust but could fit with volcanic margin or Large Igneous Province (LIP) type crusts. We propose that the, possibly continental, lower crust is intruded by magmatic material and that the upper crustal layer is likely composed of extrusive volcanic rocks of the same magmatic origin, forming thick seaward dipping reflector sequences tilted to the west. This SDR complex was emplaced during hotspot related volcanic rifting preceding the Jurassic opening of the Central North Atlantic and forming the present-day western margin of the plateau. The internal limit of the SDR complex corresponds to the future limit of the eastern margin. The Demerara Plateau would therefore be an inherited Jurassic volcanic margin boarding the Central Atlantic. This margin was reworked during the Cretaceous at the eastern limit of the Jurassic SDR complex, creating the present-day northern transform margin and the eastern divergent margin along the Equatorial Atlantic. This study also highlights the major contribution of thermal anomalies such as hotspots and superposed tectonic phases in the history of TMPs, which share a great number of characteristics with Demerara. © 2020
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170871
Appears in Collections:气候变化与战略

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作者单位: Ifremer, Géosciences Marines, Plouzané, F-29280, France; Univ Brest, Cnrs, Géosciences Océan, UMR6538, PLOUZANE, F-29280, France; ISTerre, UMR-CNRS 5275, Observatoire des Sciences de l'Univers de Grenoble, Université Joseph Fourier, Maison des Géosciences, 1381 rue de la Piscine, 38400 St. Martin d'Hères, France; University of Perpignan Via Domitia, Centre de Formation et de Recherche sur les Environnements Méditerranéens (CEFREM), UMR 5110, 52 Avenue Paul Alduy, Perpignan, 66100, France; Total SA, Centre Scientifique et Technique Jean Feger (CSTJF), Avenue Larribau, Pau, 64018, France

Recommended Citation:
Museur T.,Graindorge D.,Klingelhoefer F.,et al. Deep structure of the Demerara Plateau: From a volcanic margin to a Transform Marginal Plateau[J]. Tectonophysics,2021-01-01,803
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