Paleomagnetism of the Patagonian Plateau basalts, southern Chile and Argentina

R. F. Butler, F. Herve, F. Munizaga, M. E. Beck, R. F. Burmester, E. S. Oviedo

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37 Citations (Scopus)

Abstract

A total of 505 paleomagnetic samples were collected from 65 sites (volcanic flows) of the Patagonian Plateau basalts at four locations in southern Chile and Argentina. K/Ar analyses indicate that 38 flows from the two locations form a Late Cretaceous group (64-79 Ma), while the remaining 27 flows are Eocene in age (42-56 Ma). Progressive demagnetization indicates that a characteristic remanent magnetization (ChRM) has been successfully isolated from 59 flows. Rock-magnetic properties and analysis of ChRM directions within and between sites allow the secure inference that the ChRM is a thermoremanent magnetization acquired during original cooling. Contrary to previous indications, the South American apparent polar wander path does not reach the present rotation axis until after Late Cretaceous time. -from Authors

Original languageEnglish
Pages (from-to)6023-6034
Number of pages12
JournalJournal of Geophysical Research
Volume96
Issue numberB4
DOIs
Publication statusPublished - 1991

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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