Oceanology

, Volume 57, Issue 2, pp 328–336 | Cite as

Age of the Scan Basin (Scotia Sea)

  • Al. A. Schreider
  • A. A. Schreider
  • J. Galindo-Zaldivar
  • A. Maldonado
  • A. E. Sazhneva
  • E. I. Evsenko
Marine Geology
  • 33 Downloads

Abstract

Integrated geological and geophysical analysis of the anomalous magnetic field along with the previously unpublished profiles of Spanish expeditions onboard the R/V Hesperides and international databases of geomagnetic data processed in the context of the global tectonics concepts made it possible to identify paleomagnetic anomalies C11–C15 and compile the first map of the bottom geochronology of the Scan Basin. Unlike in earlier known publications, the paleoaxis of spreading does extend northeast, but approximately at an angle of 345°. According to calculations, spreading began 35.294‒35.706 Ma ago during chron C15r, and the spreading paleoaxis was abandoned 29.527‒29.970 Ma ago during chron C11n.2n. Thus, the destruction of the American–Antarctic bridge in the region joining the Bruce and Discovery banks with formation of oceanic crust in the Scan Basin started about 36 Ma ago. Regular spreading of the bottom has been continuing for about 6 Ma at a average rate close to 1.8 cm/year.

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Copyright information

© Pleiades Publishing, Inc. 2017

Authors and Affiliations

  • Al. A. Schreider
    • 1
  • A. A. Schreider
    • 2
  • J. Galindo-Zaldivar
    • 3
  • A. Maldonado
    • 4
  • A. E. Sazhneva
    • 2
  • E. I. Evsenko
    • 2
  1. 1.Research Institute of Economics and Management in Gas Industry Company Ltd.MoscowRussia
  2. 2.Shirshov Institute of OceanologyRussian Academy of SciencesMoscowRussia
  3. 3.University of GranadaGranadaSpain
  4. 4.Andalusia Institute of Earth SciencesGranadaSpain

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