Palaeomagnetism of the Lappajärvi impact structure, western Finland.

Details Palaeomagnetism of the Lappajärvi impact structure, western Finland. Palaeomagnetism of the Lappajärvi impact structure, western Finland.

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992tectp.216..123p&link_type=abstract

Tectonophysics, Vol. 216, No. 1/2, p. 123 - 142

Physics

11

Scientific paper

Palaeomagnetic and rock magnetic results are presented for rocks from the Lappajärvi meteorite impact structure, western Finland. The natural remanent magnitization (NRM) of the melt rocks is generally weak and metastable during demagnetization. The characteristic NRM component, carried by pyrrhotite, yields a palaeomagnetic pole (latitude 55.4°N, longitude 152.6°E, dp = 6.2°, dm = 8.7°, 6 sites) suggesting an age of ≡195 Ma for the impact. The results from a deep core drilled from the impact melt rock display similar palaeomagnetic directions but with slightly shallower inclinations. The palaeomagnetic age differs from the 40Ar-39Ar age of 77 Ma for the impact. The palaeomagnetic results are consistent with earlier interpretations based on geophysical, morphological, mineralogical and geochemical data that the Lappajärvi structure is a complex meteorite impact site less than 200 Ma old.

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