Late Cretaceous intraplate magmatic event in the North-Minusinsk depression: Paleomagnetic and 40Ar/39Ar evidence

V. Yu Bragin, V. N. Reutskii, K. D. Litasov, V. G. Mal'kovets

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8 Citations (Scopus)

Abstract

First paleomagnetic and geochronological data on four basaltic volcanic pipes of the North-Minusinsk depression are presented. It is shown that the explosion of all pipes took place between 82 and 77 Ma ago. All ChRM directions of basanites are of reverse polarity. This fact is in good agreement with the 40Ar/39Ar ages of rocks (within the accuracy of the 40Ar/39Ar-method). The revealed ChRM corresponds to the end of chron 33R of reverse polarity (according to the magnetic-polarity time scale). The distinction between the paleomagnetic poles of the investigated pipes and APWP of Eurasia is of fundamental importance.

Original languageEnglish
Pages (from-to)576-582
Number of pages7
JournalGeologiya i Geofizika
Issue number4
Publication statusPublished - 1999

Keywords

  • Ar-Ar-dating
  • Basanite
  • Paleomagnetism
  • Volcanic pipes

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