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Abstract <p>Mantle parameters derived from density and seismic tomography data in the Charlie Gibbs Fracture Zone (CGFZ) show an asymmetric complication from standard trends near the axial oceanic zone. The asymmetry is associated with plate kinematics, in which the North American Plate drifts westward at twice the rate of the Eurasian Plate Drift within the lithospheric shell, formed by spreading processes. The displacement of the entire shell relative to the plume branches is an independent process. The westward drift displaces the Mid-Atlantic Ridge (MAR) axis by ~250 km west of the axial anomaly associated with “hot” mantle minima, revealed at a depth of 185 km. The duplication of sublithospheric minima in velocities and densities to the east of the MAR at basement ages of ~21, ~43, and ~59 Ma also indicates the westward displacement of the lithospheric plate from the deep plume feeder channel, which lies beneath the lithosphere and has a variable intensity of heated material influx. The obtained patterns are confirmed by both seismic tomography and density tomography data.</p>

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Impact of the Deep Seismic Velocity and Density Heterogeneities of the Upper Mantle on the Geodynamics of Charlie Gibbs Fracture Zone (North Atlantic)

  • 期刊论文

  • 发表日期：

    2026年3月1日

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  • O. A. Artemov,
  • S. Yu. Sokolov

摘要

Abstract

Mantle parameters derived from density and seismic tomography data in the Charlie Gibbs Fracture Zone (CGFZ) show an asymmetric complication from standard trends near the axial oceanic zone. The asymmetry is associated with plate kinematics, in which the North American Plate drifts westward at twice the rate of the Eurasian Plate Drift within the lithospheric shell, formed by spreading processes. The displacement of the entire shell relative to the plume branches is an independent process. The westward drift displaces the Mid-Atlantic Ridge (MAR) axis by ~250 km west of the axial anomaly associated with “hot” mantle minima, revealed at a depth of 185 km. The duplication of sublithospheric minima in velocities and densities to the east of the MAR at basement ages of ~21, ~43, and ~59 Ma also indicates the westward displacement of the lithospheric plate from the deep plume feeder channel, which lies beneath the lithosphere and has a variable intensity of heated material influx. The obtained patterns are confirmed by both seismic tomography and density tomography data.