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Tectonic and Radiometric Age Comparisons

  • Frank John Fitch
  • John Arthur Miller
  • Diana Mildred Warrell
  • Susan Carole Williams

Abstract

The present-day structure of the North Atlantic Ocean is dominated by the mid-Atlantic ridge and the three major crustal plates which meet at (and probably originate at) this feature. These major crustal plates are the Eastern North Atlantic or Eurasian, the Western Atlantic or American, and the African plates. The oldest dated ocean-floor rocks from the area are of Upper Jurassic (Oxfordian) age and are thought to indicate that the opening of the North Atlantic began about 180 m.y. ago (Early Jurassic, Le Pichon and Fox, 1971). The mid-Atlantic ridge is the site of present-day volcanism: eruptions have occurred within the last five years in the Azores, Iceland, and Jan Mayen. Modern dating research has generally confirmed the predictions made by Wilson (1963) that the ocean floor and oldest volcanic rocks on the Atlantic oceanic islands would be found to increase in age away from the ridge (Funnel and Smith, 1968; JOIDES results; Moorbath et al., 1968; Aumento et al., 1968; Fleisher et al., 1968; and many other authors).

Keywords

Nova Scotia Fold Belt Mobile Belt Supracrustal Rock Dike Intrusion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1974

Authors and Affiliations

  • Frank John Fitch
    • 1
  • John Arthur Miller
    • 2
  • Diana Mildred Warrell
    • 2
  • Susan Carole Williams
    • 1
  1. 1.Birkbeck CollegeUniversity of LondonUK
  2. 2.Department of Geodesy and GeophysicsUniversity of CambridgeUK

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