Tehostekuvassa fysiikan laitosta etuoven suunnalta

1. Supercontinent research

Researchers

  • L.J. Pesonen, Project leader
  • J. Salminen, Ph.D.
  • T. Veikkolainen, M.Sc.
  • R. Klein, M.Sc.
  • S. Mertanen (Geological Survey of Finland)
  • S-Å Elming (Luleå Univ. of Tech, Sweden)
  • S. Pisarevsky (Univ. of Western Australia)
  • D. Evans(Univ. of Yale, USA)
  • E. Piispa (Michigan Tech, USA)

Project goals

The goal is to study the movement of the continents or cratonic blocks as based on paleomagnetism. Special emphasis is given on solving the drift history of Fennoscandia. Supercontinents play an important role in the project, especially the supercontinent assemblies of Precambrian age, such as Kenorland, Columbia and Rodinia (IGCP-509, supercontinent.org). The group also investigates the Pangaea assembly of Kalahari craton during the Jurassic times as based on paleomagnetic data of Karroo rocks from Dronning Maud Land, Antarctica.

Highlights

  • Supercontinent Symposium 2012 was successfully organized at Kumpula Campus, September 25th-28th 2012.
  • Three Precambrian supercontinents prevailed: Kenorland (2600-2400 Ma), Columbia (1800-1200 Ma) and Rodinia (1050-750 Ma).
  • Geological continuations include conjugate orogenic belts, diabase dyke swarms, rapakivi massifs and kimberlite corridors.
Fig.1: Precambrian supercontinents: example of the Rodinia assembly at 1.04 Ga Fig.2: Supercontinents will be discussed in the Symposium 2012, to take place in Kumpula Campus, Univ. of Helsinki
Fig. 1: Precambrian supercontinents: example of the Rodinia assembly at 1.04 Ga Fig. 2: Supercontinents were discussed at the Supercontinent Symposium 2012, organized at Kumpula Campus, University of Helsinki, in September 2012.
Fig.3: Evolution of supercontinents with a ~500Ma cyclicity Fig.4: Paleoclimatically controlled sediments
Fig.3: Evolution of supercontinents with a ~500Ma cyclicity Fig.4: Paleoclimatically controlled sediments

Recent publications

  • Mertanen, S. and Pesonen, L.J, 2012. Paleo-Mesoproterozoic Assemblages of Continents: Paleomagnetic Evidence for Near Equatorial Supercontinents. In: I. Haapala (Ed.), From the Earth's Core to Outer Space: Lecture Notes in Earth Sciences, 137, Springer, 11-35.
  • Pesonen, L.J., Mertanen, S. and Veikkolainen, T., 2012. Paleo-Mesoproterozoic Supercontinents - A Paleomagnetic View. Geophysica 48(1-2), 5-47.
  • Donadini F., Pesonen, L.J., Korhonen, K., Deutsch, A., Harlan, S.S., 2011. Paleomagnetism and paleointensity of the 1.1 Ga old diabase sheets from Central Arizona. Geophysica 47(1-2), 3-30.
  • Piispa, E.J., Smirnov, A.V., Pesonen, L.J., Lingadevaru, M., Anantha Murthy, K.S. and Devaraju, T.C., 2010. An integrated dyke research of Paleoproterozoic Dyke Swarms in the Dharwar Craton, India. In: R. Srivastava (Ed.), Dyke Swarms - Keys for Geodynamic Interpretations, Part I, Chapter 3, pp 33-46.
  • Elming, S.-Å. and Pesonen, L.J., 2010. Recent Developments in Paleomagnetism and Geomagnetism. Sixth Nordic Paleomagnetic Workshop, Luleå (Sweden), 15-22 September 2009. EOS, 90 (51), p. 502.
  • Salminen, J., Pesonen, L.J., Mertanen, S., Vuollo, J. and Airo, M-L., 2009. Paleomagntism of the Salla Diabase Dyke, northeastern Finland and its implications to the Baltica-Laurentia entity during the Mesoproterozoic. In: Reddy, S.M., Mazumder, R., and Evans, D.A.D.,(eds.) Palaeoproterozoic Supercontinents and Global Evolution. Geological Society Special Publication 323, 199-217.
  • Pesonen, L.J., and Sohn, M-J, 2009. Mantereet ja supermantereet. In: Haapala, I., and Pulkkinen, T., (eds.) Maan ytimestä avaruuteen. Ajankohtaista suomalaista geo-ja ympäristötieteellistä tutkimusta. Bidrag till kännedom av Finlands natur och folk, 13-31.
  • Pesonen, L.J. , Elming, S.-Å., Pisarevsky, S., Mertanen, S., D'Agrella-Filho, M., Meert, J., Schmidt, P., Abrahamsen, N., Bylund, G., 2003. Paleomagnetic configuration of continents during the Proterozoic - a paleomagnetic survey. In: Sircombe, K. and McElhinny, M.W. (Eds.), Tectonophysics 375, Issues 1-4, 289-324

Other information

  • The project is a collaboration between the University of Helsinki, Division of Geophysics, and the Geological Survey of Finland, Espoo, being part of the IGCP-509 international project "Supercontinents during the Precambrian" and the project Supercontinent.org.