Kinematic Models of the Evolution of the Gorda Rise and President Jackson Seamount Chain

  1. John M. Sinton
  1. P. R. Stoddard

Published Online: 19 MAR 2013

DOI: 10.1029/GM057p0031

Evolution of Mid Ocean Ridges

Evolution of Mid Ocean Ridges

How to Cite

Stoddard, P. R. (1989) Kinematic Models of the Evolution of the Gorda Rise and President Jackson Seamount Chain, in Evolution of Mid Ocean Ridges (ed J. M. Sinton), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM057p0031

Author Information

  1. Department of Geological Sciences, Northwestern University, Evanston, Illinois

Publication History

  1. Published Online: 19 MAR 2013
  2. Published Print: 1 JAN 1989

ISBN Information

Print ISBN: 9780875904580

Online ISBN: 9781118666449

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Keywords:

  • Sea—floor spreading—Congresses;
  • Mid-ocean ridges—Congresses

Summary

The reorientation of the Juan de Fuca Plate at 5–10 Ma changed the geometry of the Gorda Rise and neighboring Blanco and Mendocino Transform Faults. The resulting ridge-transform-ridge geometry made transform-parallel, ridge-perpendicular spreading impossible, forcing segmentation and rotation of the Gorda Rise spreading center. This segmentation was accomplished by two propagators, and is reflected by both bathymetry and magnetic lineation pattern. A kinematic model is developed which accurately reproduces the magnetic lineations and is consistent with the bathymetric and dynamic constraints. In addition, two models are developed for the generation of the President Jackson Seamount chain. One calls for a hotspot, evidence of which may be found on both the Juan de Fuca and Pacific Plates; and the other, interaction of a weak hotspot, or “warm spot,” with one of the propagator wakes resulting from the evolution of the Gorda Rise.