The Barracuda Ridge and Tiburon Rise, East of the Lesser Antilles : origin, evolution and geodynamic implications
type: Dataset
description: The Barracuda Ridge and the Tiburon Rise, two oceanic-basement ridges, lie in the western Atlantic Ocean, where oceanic lithosphere of the North American (NAM) and South American (SAM) plates is subducted beneath the Caribbean plate, creating the Lesser Antilles volcanic arc and the Barbados Ridge accretionary complex. The process and the timing of the uplift leading to the present day morphologies of the Tiburon and Barracuda ridges, that seem to be key markers in the geodynamic history of the region, has remained a matter of debate for decades.From the analysis of new multibeam and seismic reflection profiles acquired in 2007 (Antiplac crusie) DSDP-ODP boreholes available, we provide new information on the timing of the formation of the Barracuda Ridge and Tiburon Rise in their present-day configurations. We propose paleogeographic reconstructions with the main sediments fluxes deposited in the area of the Barracuda and Tiburon ridges from the Late Cretaceous to present. Structural analysis shows reactivation of fracture zones in a transpressive setting leading to the uplifts of the Barracuda and Tiburon Ridges.The location of the Barracuda Ridge and the Tiburon Rise and the timing of the uplift fit well with recent global plate kinematic models describing the movements of NAM relative to SAM along a diffuse plate boundaryThis NAM-SAM plate boundary zone, therefore must most certainly be heterogeneous in nature, exploiting weaknesses in the lithosphere provided by fracture zones where mechanically advantageous, but forming new boundary segments elsewhere, to transfer motion between reactivated segments of the fracture zones.
identifier: NNT: 2012BRES0039
issued: 2026-05-10T06:44:42.352351
language: fr
modified: 2026-05-10T06:44:42.352354
contact point: Organization
  fn: CCSD
keyword: barracuda-ridge
keyword: diffuse-plate-boundary-zone
keyword: fracture-zone
keyword: infoeu-reposemanticsdoctoralthesis
keyword: lesser-antilles-subduction-zone
keyword: limite-de-plaque-diffuse
keyword: ride-de-barracuda
keyword: ride-de-tiburon
keyword: sdustusciences-of-the-universe-physicsearth-sciences
keyword: seismic-reflection-data
keyword: sismique-reflexion
keyword: theses
keyword: tiburon-rise
keyword: transpression
keyword: zone-de-fracture
keyword: zone-de-subduction-de-petites-antilles
landing page: https://theses.hal.science/tel-00846889

The Barracuda Ridge and Tiburon Rise, East of the Lesser Antilles : origin, evolution and geodynamic implications
type: Distribution
format: HTML
issued: 2026-05-10T06:44:42.355102
modified: 2026-05-10T06:44:42.329292
access URL: https://theses.hal.science/tel-00846889

test_moissonnage_selune
type: Agent