, Volume 46, Issue 1, pp 114–122 | Cite as

Geochronology of the American-Antarctic Ridge

  • A. A. Schreider
  • Al. A. Schreider
  • A. A. Bulychev
  • J. Galindo-Zaldivar
  • A. Maldonado
  • G. L. Kashintsev
Marine Geology


A new map of chrons for the American-Antarctic Ridge area has been compiled. Its analysis and the calculations performed showed that the seafloor spreading with respect to its axis started before 85 My B.P. The spreading directions were 115° (chrons C34-C29), 145° (chrons C29-C21), 110° (chrons C21-C5C), and 85° (chrons C5C-C1). The maximum rates of about 4 cm/year were reached earlier than 52 My B.P.; subsequently, a progressive general decrease in the spreading rate has been observed. According to our forecast, the spreading may cease in the following 3.5 My.


Maximum Rate Spreading Rate General Decrease Seafloor Spreading Spreading Direction 
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

© Pleiades Publishing, Inc. 2006

Authors and Affiliations

  • A. A. Schreider
    • 1
  • Al. A. Schreider
    • 2
  • A. A. Bulychev
    • 2
  • J. Galindo-Zaldivar
    • 3
  • A. Maldonado
    • 4
  • G. L. Kashintsev
    • 1
  1. 1.Shirshov Institute of OceanologyRussian Academy of SciencesMoscowRussia
  2. 2.Department of GeologyMoscow State UniversityMoscowRussia
  3. 3.University of GranadaGranadaSpain
  4. 4.Institute for Mediterranean GeologyGranadaSpain

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