Tehostekuvassa fysiikan laitosta etuoven suunnalta

1d. Paleomagnetism of Keweenawan Baraga-Marguette dykes

Participating scientists

  • E. Piispa (post doc, Michigan Tech, USA)
  • L.J. Pesonen, prof. (emeritus)
  • A. Smirnov (Michigan Tech, USA)
  • J. Diehl

Project goals

The goal is to get further light on the mysterious Keweenawan reversal asymmetry. Focus is on fresh dykes of the Little Mountain (Baraga) and Sugar Loaf (Marquette) areas.


New N polarity dykes discovered in Baraga area which reveal the same reversal asymmetry as previously documented around Lake Superior Keweenawan units.

Recent publications

  • Piispa, E.J., Smirnov, A.V. and Pesonen, L.J., 2011. Paleomagnetism of Midcontinental Rift rocks from the northern shore of Lake Superior (Ontario, Canada): Preliminary results. In: 57th annual meeting, Institute in Lake Superior Geology. Ashland, Wisconsin, May 18-21, 2011, v. 57, p. 65.
  • Piispa, E.J., Smirnov, A.V., Pesonen, L.J., Hollings, P., Smyk, M., Campbell, D. and Scott, J., 2011. Paleomagnetism of Mid-Continental Rift System rocks from Thunder Bay area (Ontario, Canada): New data and new question. In: GSA Annual Meeting in Minneapolis, October 9-12, 2011. Geological Society of America Abstracts with Programs, Vol. 43, No. 5, p. 591.